Asymmetry in knowledge, attitudes, and practices of shark conservation advocates: sustainable shark sheries vs. bans on sheries and trade

Current shark conservation and management conicts represent an underrecognized expression of long-standing debates over whether the goal of modern conservation should be sustainable exploitation of natural resources or maximum possible preservation of wilderness and wildlife. In the developing world, exploitation of sheries resources can be essential to food security and poverty alleviation, and management is typically focused on sustainably maximizing economic benets. This approach aligns with traditional sheries management and the perspectives of most surveyed scientic researchers who study sharks. However, in Europe and North America, sharks are increasingly venerated as wildlife to be preserved irrespective of conservation status, resulting in growing pressure to prohibit exploitation of sharks and trade in shark products. To understand the causes and signicance of this divergence in goals, we surveyed 155 shark conservation focused environmental advocates from 78 environmental non-prots, and asked three key questions: (1) where do advocates get scientic information? (2) Does all policy-relevant scientic information reach advocates? and (3) Do advocates work towards the same policy goals identied by scientic researchers? Findings suggest many environmental advocates are aware of key scientic results and use science-based arguments in their advocacy, but a small but vocal subset of advocates report that they never read the scientic literature or speak to scientists. Engagement with science appears to be the key predictor of whether advocates support sustainable management of shark sheries or bans on shark shing and trade in shark products. Conservation is a normative discipline, and this analysis more clearly articulates two distinct perspectives in shark conservation. Most advocates support the same evidence-based policies as academic and government scientists, while a smaller percentage are driven more by moral and ethical beliefs, and may not nd scientic research relevant or persuasive. A values-based perspective is also a valid approach to conservation, but claiming that it is a science-based approach while misrepresenting the science is problematic. This suggests possible alternative avenues for engaging diverse stakeholders in productive discussions about shark conservation.


Introduction
The most effective and appropriate way to conserve and manage the environment has long been debated [1], exempli ed in the United States by the rational utilization approach of Gifford Pinchot (i.e., active management of resources with the goal of exploiting them with minimal impacts on the environment) versus the preservationist approach of John Muir (i.e., fully protect pristine wilderness and associated wildlife). There is broad public agreement about which of these approaches to apply to some environmental problems; few Americans would dispute that the great whales are "wildlife" to be preserved from exploitation while anchovies are "natural resources" to be sustainably exploited (for more on the framing and language around these issues, see [2]. Con icts within the environmental community, and between the environmental community and other stakeholder groups, can occur when there is a dispute over which philosophical approach applies to given environmental problem [3]. The debate over the best approach to take when conserving and managing chondrichthyan shes (sharks and their relatives, though in this paper we focus exclusively on sharks) is an interesting case study of such a con ict, with some stakeholders believing that sharks are natural resources to be sustainably exploited, and others asserting that sharks are wildlife to be preserved.
Chondrichthyan shes (sharks, rays, skates and chimaeras) comprise over 1,200 species, and include some of the most threatened vertebrates on Earth, due largely to over shing [4]. However, one quarter of species are considered Least Concern by the IUCN Red List [4], and many are sustainably exploited [5] Since sharks can be ecologically important [e.g., 6] and are a popular encounter for SCUBA divers and other marine tourists [e.g., 7] issues surrounding their conservation have resulted in signi cant public interest and concern [8].
Possible conservation solutions for threatened sharks can be broadly categorized into two main policy families: "target-based" solutions (e.g., traditional sheries management) which are intended to maximize sustainable sheries exploitation, and "limit-based" solutions (e.g., nationwide bans on shark shing, termed "Shark Sanctuaries," or bans on the sale of shark ns), which are intended to ban all sheries exploitation and trade of all sharks regardless of the sustainability of a particular shery [9] Support for limit-based policies is sometimes tied to a belief that sustainable shark sheries cannot or do not exist [10] and that bans are therefore the only possible solution. Support for target-based policies is likely to correlate with beliefs that sustainable shark sheries can and do exist, and offer social, economic, or conservation bene ts not available under limit-based bans. The scienti c literature is clear that shark sheries can [11] and do [5,12] exist, though the majority of the world's shark sheries are currently unsustainable.
Conservation and management has long been dependent on expert opinions, especially those of professional scientists. A recent survey of members of the American Elasmobranch Society, the oldest and largest professional society focusing on the scienti c study and management of chondricthyan shes, found that majorities of surveyed scientists agree that sustainable shark sheries are possible (84%), currently exist in the world today (83%,) and should be the goal of conservation advocacy over bans when possible (90%) [13]. These AES scientists also showed signi cantly greater support for targetbased policies vs. limit-based policies, and expressed concern that some environmental non-pro t groups working in the shark conservation space were focusing on the wrong shark conservation problems, advocating for ineffective solutions, and/or sharing inaccurate information related to shark conservation threats and policy solutions. While an alternative values-based approach to conservation is perfectly valid and has contributed signi cantly to numerous successful advocacy campaigns, issues can arise when proponents of such an approach misrepresent the state of science to support their values-based advocacy.
This paper represents a case study on sharks which illuminates philosophical divisions over exploitation vs. preservation more broadly, and discusses how these divisions have contributed to di culties in communication around conservation issues between scienti c experts and some members of the shark conservation advocacy community. Here we report on the results of a survey sent to employees of environmental non-pro t organizations who work on shark conservation advocacy and public education.
The survey focused on three general questions: (1) Where do environmental advocates get their scienti c information? (2) Does all relevant scienti c information reach environmental advocates? and (3) Do environmental advocates work towards the stated policy preferences of scientists?

Methods
Identi cation of shark conservation NGO employees: We identi ed 78 environmental non-pro ts that participate in shark conservation advocacy or public education in the English-speaking world (Supplementary materials table S1) using a combination of internet search engine searches for shark conservation advocacy, our own records from combined decades working on ocean conservation science issues, and snowball sampling (i.e., asking contacted advocates to suggest other organizations we should be sure to include).
Representatives of each non-pro t were contacted via e-mail and asked to provide a list of contact information for anyone at their organization or partner organizations who works directly on these issues.
We compiled a base list of 155 names of employees of environmental non-pro t groups whose job focuses on shark conservation advocacy and/or public education (henceforth "environmental advocates"). Shark conservation advocacy and public education was de ned broadly to capture as much of the diversity of thought and action in this space as possible, but did not include employees of non-pro t groups whose primary duties included scienti c research, as the intended focus of this study is individuals engaged in advocacy, outreach, and education.
Survey: These 155 individual environmental advocates were sent an individualized but anonymized link to participate in a voluntary online survey hosted through SurveyMonkey.com. The survey included 49 questions, focusing on environmental advocates' perspectives on shark conservation policies and relevant science (Supplementary Materials Table S2). Respondents were promised no compensation for completing the survey and were permitted to stop answering questions at any time.
We included questions relating to demographic background (age, gender, education), NGO background (size, scope, role in the advocacy process), science knowledge and attitudes (questions concerning advocates' past experience working with scientists, their perspectives on the state of scienti c research, and how well-versed they are in the current scienti c literature) conservation background questions (thoughts on threats facing sharks and the general issues surrounding shark conservation), and policy preferences (support for and opposition to certain speci c shark conservation policies).We also asked about awareness of rebuttals (scienti c papers disputing the results of previous scienti c papers), which were used as a proxy for awareness of technical information related to shark conservation and management. Eight survey respondents also participated in a follow-up interview over Skype.
Average completion time of the survey was 43 minutes. Respondents who did not complete the entire survey had the answers they did provide analyzed, and the blank responses were not counted. This research is approved under Simon Fraser University's O ce of Research Ethics permit # 2017-S0524, all research was performed in accordance with all relevant human subjects research ethics guidelines and regulations, and as explicitly stated in the recruitment materials, participation in the survey constituted informed consent. .

Statistical analysis
Analysis focused on determining what demographic background characteristics of a respondent (or the NGO that employs that respondent) made them more likely to be aware of certain scienti c information or more likely to support or oppose a particular policy. All statistical analysis was performed using R software (R version 3.5.2 2018-12-20 --"Eggshell Igloo").
We used conditional inference trees to determine the primary partitioning variables (demographic or NGO background) responsible for particular outcomes (awareness of scienti c research and support for certain policies) using the PartyKit package in R [14.] These trees highlight which variable is responsible for the greatest difference in output by tting models to each combination of variables, and splitting the dataset at the variable associated with the greatest divergence in output. Conditional inference trees were run to determine the primary partitioning variables associated with the following outputs: general preference for sustainable sheries or for total bans, support for or opposition to shark n trade bans, awareness that sustainable shark sheries exist, and understanding of the state of scienti c research concerning sustainable shark sheries.
Additionally, following [13,] 95% con dence intervals were generated for differences in awareness of scienti c information or support for certain policies between proportions of respondents separated by demographic background characteristics. This was done using the diffscoreCI function in the PropCIs R package.

Demographics of survey respondents
More than half of contacted environmental advocates completed the survey (54.2% response rate, N=84), though not every respondent answered every question. While this is a low N overall, it represents a major segment of the entire population of shark conservation advocates and educators in the English-speaking world. Fifty-seven percent of respondents identi ed as female, and one respondent preferred not to answer this question. Respondents ranged in age from 24-70, with a mean age of 41 years old. Age or gender were not signi cantly correlated with any variables measuring understanding of current science or support for any management policy and are not analyzed further. Thirty-seven respondents have a Master's degree, and seventeen have a Ph.D.
NGOs were classi ed by scope (shark-focused, ocean-focused including but not limited to sharks, or focused on all environmental issues including but not limited to sharks), area of geographic focus, and size (number of employees). Forty-six percent of respondents worked for an ocean-focused conservation NGO that included a shark portfolio (e.g., Oceana), while thirty-two percent worked for an exclusively shark-focused NGO (e.g., the Shark Trust). The remaining twenty-two percent of respondents worked for large NGOs that focus on a variety of land and sea conservation issues (e.g., World Wildlife Fund). Of those who did not claim that the scope of their work was global, the largest proportion of respondents worked in North America and Europe, followed by the Caribbean, South Africa, and Southeast Asia. Some respondents also worked in Central America, Brazil, the South Paci c, and Australia ( Figure 1A).
Respondents reported that the size of their non-pro t ranged from zero paid employees (i.e., all volunteer) to over 5,000, with a median of 14 employees ( Figure 1B). 24 respondents reported working for a nonpro t with more than 100 employees, 36 reported working for a non-pro t with fewer than 5 employees.

Results
Where do environmental advocates get their scienti c information?
Two-thirds of respondents indicated that they regularly read several peer-reviewed primary scienti c literature articles each month, and only eight percent of respondents indicated that they had never read a peer-reviewed primary literature article. All respondents who reported having never read the literature worked for a non-pro t with fewer than 10 employees. Fifty-ve percent of respondents indicated that they had been a coauthor or lead author on at least one peer-reviewed primary scienti c literature article.
Fifty-six percent of respondents reported that scientists are directly employed by their non-pro t, and 16% reported that their non-pro t had a formal scienti c advisory board composed of independent scientists who were available for technical consultation. Only 12% of respondents indicated that their NGO does not work with any scientists in any capacity (each of the 8% of respondents who reported never having read a scienti c article also reported never working with scientists in any capacity). Of the respondent who do not work with scientists in any capacity, 75% reported working for very small (less than ve employees) shark-focused NGOs in Europe and North America.
Respondents reported that science-based arguments were by far the most commonly advanced arguments for shark conservation used by their NGO (Figure 2, Supplementary Materials Table S3), especially the idea that shark population declines can cause negative ecosystem-wide effects. Respondents reported that moral or values-based arguments were much less frequently employed than science-based arguments.
Does all relevant scienti c information reach environmental advocates?
Surveyed environmental advocates were most aware of scienti c papers showing severe shark population declines and papers showing negative ecological consequences of those declines (97% and 100% awareness respectively). Fewer respondents were aware of rebuttals to those papers (72.7%) or of papers showing that that sustainable shark sheries are possible (82.6%). For controversial papers, these rebuttals can be seen as an attempt to correct the scienti c record by pointing out an error in the rst paper, therefore awareness of the rebuttals was considered to be a proxy for technical knowledge related to the current state of scienti c knowledge of shark conservation and management issues.
In follow-up interviews, respondents reported actively looking for rebuttals whenever they nd a paper that appears to support their perspective. One explained "We look for it all, and we're always open to using new science that comes along and tells us something different." Another said "We always try and include rebuttals and contradictory data to provide the whole picture." A third told interviewers that "It's too easy to see a paper that justi es your claim that you can jump on and use, but how valid is that?" Interviewees consistently stressed the importance of seeking out data that not only supported their arguments, but was scienti cally valid.
Environmental non-pro t advocates surveyed here also raised concerns about the focus of most shark research produced by academic scientists. Several respondents suggested that the current scienti c focus on a few well-studied shark species in a few well-studied regions could usefully be expanded to include less charismatic species and study sites in the developing world. Respondents also raised concerns about scientists claiming to do conservation-relevant research without consulting managers or colleagues to see what kind of data would be most useful. One follow-up Skype interview participant said that if scientists want to do policy-relevant research, "The rst step is to try and identify information needs of policymakers; they know what they don't know and what they need to know-talk to them as early as possible when starting a research project!" Respondents also suggested new roles for scientists, including serving as public educators and/or advocates for conservation by communicating their research to the public, and providing training and opportunities to colleagues in the developing world instead of engaging in "helicopter science" by visiting far away places and leaving as soon as their research was done. There were also calls for more research on the human dimensions of shark conservation, including socioeconomic studies of shark shers.
Do environmental advocates work towards the stated policy preferences of scientist?
Over half (56%) respondents correctly identi ed that sustainable shark sheries are possible, and nearly half (46%) correctly identi ed that sustainable shark sheries exist in the world today (there is no factual or scienti c doubt that such sheries can and do exist; while preferring bans based on personal values is a valid approach, claiming that bans are necessary because sustainable sheries are scienti cally impossible is a misrepresentation of the science). More than three-quarters (78%) of respondents believed that the goal of shark conservation advocacy should be to promote sustainable exploitation instead of complete bans on exploitation and trade (Figure 3, Supplementary Materials Table S4 and Figure S1). In each case, signi cantly fewer NGO employees than previously-surveyed AES scientists agreed with these statements.
Results show that in general, the environmental advocates who most strongly support bans on sheries and trade are the least scienti cally knowledgeable; while many of these respondents claimed that science was important and that their arguments were based on science, many arguments misrepresented the state of the science. A conditional inference tree found that the primary partitioning variable associated with general support for bans on trade was self-reported regularity of reading the scienti c literature; 100% of respondents who report never reading the scienti c literature supported bans over sustainable sheries, compared with just 10.5% of respondents who reported regularly reading the scienti c literature (Figure 4). There was also a clear geographic bias in the limit-based v. target-based divide, with respondents who worked in the developed world more likely to support bans than those working in the developing world ( Figure 5) .
Of respondents who support a total ban on all exploitation and trade over sustainable sheries, 86% work in the US or Europe, with 100% of respondents who work in South America, the Indo Paci c, the Caribbean, or Africa preferring sustainable shing over bans (Figure 4). One-third (N=7) of respondents who work at shark-speci c environmental non-pro ts support bans over sustainable sheries, compared to just 12% (N=3) of those who work in ocean-focused environmental non-pro ts. 50% of all stated preferences for bans over sustainable sheries came from advocates working for very small (less than ve employees) non-pro ts.
Respondents who did not believe that sustainable shark sheries are possible or exist cited a variety of reasons, ranging from not having personally seen evidence of sustainability to technical concerns to beliefs that sustainable sheries in general cannot and do not exist (Table 1). Sustainable shark fisheries will always be at the mercy of the unscrupulous who will ignore the rules and seek to evade enforcement issues in order to make a quick, short-term profit Several shark fisheries have not been evaluated. Data is lacking to understand the health of shark populations. Sharks are often part of a complex multi-species fishery and caught as bycatch creating challenges for data collection and assessment. Due to the high vulnerability of many species to overfishing it is necessary to take precautionary measures to reduce fishing pressure while data is improved. "Sustainability" is over-used politically and an illusion in many ways. It sounds nice in political documents but I do not think that governments yet understand the true meaning nor have any idea how to realize it, not just for sharks Many species lifespans are time until sexual maturity is too long to allow them to sustain fishing. No sustainable shark fishing is possible!!! I think there is a HUGE gap between the scientists who study fisheries in well-resourced countries with good fisheries governance structures, and marine scientists (of all sorts, not just fisheries folk) who have seen what "fisheries management" looks like in the rest of the world.
The individual who reported never having personally seen any evidence of sustainable shark sheries also reported never having read the scienti c literature and never interacting with professional scientists. Those respondents who did believe that sustainable shark sheries are possible and exist mostly cited peer-reviewed published technical literature to support their opinion (Table 2), though several noted that while these sheries can and do exist, there aren't very many of them, and not all shark sheries are potentially sustainable. This suggests that while some advocates are not aware of the current state of science on this topic or are misinformed about it, for some, the issue is less about whether sustainable shark sheries are possible in theory than about whether they believed successful implementation of sustainable management practices was probable in the complex real world-there are certainly many examples of poorly managed shark sheries.
One respondent explicitly mentioned misinformation from other non-pro ts as a possible cause of public misunderstanding on the issue of sustainable shark sheries. A conditional inference tree indicated that the primary partitioning variable driving the belief that sustainable shark sheries exist was awareness of rebuttals to high-pro le shark conservation papers, which was used as a proxy for awareness of the current state of technical literature ( Figure 5). Only 24% of respondents who were unaware of those rebuttals believed that sustainable shark sheries exist, compared to 78% of those who were aware of these rebuttals. Of respondents who report regularly reading the scienti c literature, 88.6% (N=39) believe that there are current examples of sustainable shark sheries, compared with just 50% (N=2) of those who never read the literature and 62% (N=10) of those who rarely read the literature. Sixty-ve percent of all respondents who believe that sustainable sheries do not exist come from the US or Europe, and no respondents in the Caribbean, South America, or Africa believed that sustainable shark sheries do not exist.
A plurality of respondents (45.8%) believed that the science concerning the sustainability of shark sheries is currently uncertain, and 15.2% of respondents believed that the science is clear that sustainable shark sheries cannot and do not exist. Sixty-ve percent of respondents with a Masters or Ph.D. correctly identi ed that the science is clear that sustainable shark sheries can and do exist (and 0 respondents with an advanced degree indicated that the science is clear that sustainable shark sheries cannot and do not exist). There was also a divide by familiarity with the scienti c literature, none of the respondents who never read scienti c papers correctly identi ed that the science is clear that sustainable shark sheries can and do exist, compared with 26.6% of those who rarely read the literature and 45.2% of those who regularly read the literature. Fifty percent of respondents who never read the literature inaccurately believe that the science is clear that sustainable shark sheries cannot and do not exist, compared with 26.6% of those who rarely read the literature and 9.5% of those who regularly read the literature. Nine percent of respondents reported that their opinions about shark sheries come from their personal ethical values, and therefore scienti c measures of sustainability are not relevant to their decision-making on this topic.
Fifty-four percent of respondents reported that their environmental non-pro t organization has worked on sheries management tools in the last ve years, compared with lower numbers of those whose employer worked on no-take marine protected areas (45.2%), n bans (25%), and Shark Sanctuaries (16.7%). Many respondents noted that different contexts (cultural, political, and economic) require different kinds of solutions, that there is no one "silver bullet" policy for shark conservation, and that enforcement of existing management rules is critical no matter which policy strategy is selected. Signi cantly more respondents support traditional sheries management tools (73.3%) than support either Shark Sanctuaries (49.1%) or shark n trade bans (41%), and signi cantly more respondents oppose Shark Sanctuaries (30.1%) and shark n trade bans (32.7%) than oppose traditional sheries management tools (5%) (Figure 6). There was no difference in support for or opposition to no-take marine protected areas vs. traditional sheries management tools. The only respondent who strongly disagreed with traditional science-based sheries management tools also reported never reading the literature or interacting with a scientist.
A conditional inference tree indicated that the primary partitioning variable associated with support for shark n trade bans was belief that sustainable shark sheries cannot exist ( Figure 4); 100% of respondents who believe that sustainable shark sheries cannot exist support shark n trade bans, compared with 24% of respondents who believe that sustainable shark sheries can exist. Respondents with a Ph.D. showed the least support for shark n bans (18.1%, compared to 43.7% support from respondents with a Bachelor's degree and 54.1% support from respondents with a Masters). Respondents who regularly read the literature had the lowest support for n bans (31.5% support, compared with 57.1% support from those who rarely read the literature and 75% support from those who never read the literature) (Figure 7). The only two geographic regions where more respondents supported n bans than opposed them were Europe (56.2% support) and North America (60% support). In Asia, 50% of respondents oppose n bans compared to 33.3% who support them. No respondents from the Caribbean support n bans. The Indo-Paci c and South America had equal numbers of supporters and opponents.

Discussion
We reveal here some of the possible drivers of poor communication and misunderstanding between stakeholder groups concerned about shark conservation. Our results provide important context about factors shaping policy preferences for conservation groups, showing further evidence of a target-based vs. limit-based schism in shark conservation advocacy. We also provide information that may help explain how that schism formed, and potential strategies for improving communications.
Many environmental advocates in the shark conservation space work for scienti cally informed and scienti cally engaged non-pro ts-these environmental advocates regularly read the scienti c literature, regularly engage with scientists, and work towards some of the policy preferences supported by scientists. This suggests that science can indeed in uence and assist with advocacy and policy change, heartening information for scientists who want their research to make a difference [15].
However, a number of smaller shark conservation non-pro ts are not scienti cally informed, and may operate based on personal values rather than scienti c facts even as some claim to base their arguments on scienti c facts. Employees of these non-pro ts were not aware of relevant scienti c information, and in some cases mischaracterized relevant scienti c information while supporting policies that are the least supported (and most opposed) by surveyed scientists. There's no doubt that conservation is a normative discipline and values can play an important role; animal welfare concerns rather than sustainability concerns drove some of the earliest restrictions on shark nning, for example. However, ignoring relevant science can lead to suboptimal policy outcomes [16], focusing only on the perceived cruelty of shark nning and not on the unsustainability of associated over shing of sharks did nothing to reduce overall shark mortality in the Paci c Ocean [17]. Environmental advocacy based on moral or ethical beliefs is entirely valid and can play an important role in driving policy change, but interviewees repeatedly noted that it is problematic to offer false or misleading information as part of "science-based" arguments for conservation. In other words, approaching conservation with arguments that don't involve scienti c facts is a valid and important approach, but when claiming to use scienti c facts it is important that those facts be accurate.
It is also worth noting that many of the concerns about the current focus of scienti c research raised by surveyed environmental advocates are legitimate, and any scientist concerned about misrepresentation of science by advocates should also be concerned with improving the quality and diversity of conservation-relevant scienti c data. Calls for scientists to focus our efforts on species that haven't already been well-studied or on places where there is little scienti c infrastructure in place (and to develop local capacity while doing so) point to a genuine problem with the state of shark research. Requests that scientists learn how policymaking works so they can generate more policy relevant research illustrates one way that science could provide greater value to managers. Increased engagement with the public is another worthy avenue to pursue, especially in a eld where many scienti c experts hope to use their data to improve management and conservation [13,18.] While many advocates report regularly reading the literature, not all literature is equally well-known.
Research showing severe population declines and the negative ecosystem consequences of those declines is better known than rebuttals to those papers, supporting the assertion by [19] that rebuttals have value, but may not meaningfully adjust future usage of a rebutted paper. It should also be noted that smaller non-pro ts who do not read the scienti c literature may simply not have the resources to afford access to scienti c journals and databases, which can be quite expensive [see 20]. Though several employees of non-pro ts surveyed here explicitly stated that this was not the case for them, it is possible that easier, more affordable access to published literature and expert scienti c advice for smaller NGOs could help address some of this divide.
Advocates who regularly read the literature, advocates based in the developing world, and advocates with advanced degrees supported sustainable sheries more than those who never or rarely read the literature, those in North America and Europe, and those without advanced degrees, respectively. While it is important to note that skeptics of sustainable shark sheries management raised valid concerns regarding the historical unsustainability of shark sheries and di culties with implementing sustainable management in some nations, it is demonstrably true that sustainable shark sheries can and do exist, and claims to the contrary misrepresent the state of scienti c knowledge. It is also noteworthy that supporters of the goal of sustainable sheries are more likely to come from the developing world where such sheries are relatively rare, and supporters of total bans are more likely to come from developed nations where successful sustainable sheries management is more common. This may be because a ban on shing is less feasible in less prosperous nations where shing is an economically critical activity vital to local food security. Additionally, some types of animal welfare concerns are more common in developed nations.
While a majority of advocates work towards target-based sheries management policies, some work towards the policies least supported by scientists. Interestingly, while of course some proponents are educated knowledgeable professionals, it is noteworthy that more environmental non-pro t employees than scientists [13] oppose shark n bans, for essentially the same reasons given by scientists [12] and support for n bans is higher among those who never or rarely read the literature than among those who read it regularly.

Conclusions
Surveyed scientists in [13] raised concerns that some non-pro t groups are not focusing on what scienti c experts perceive as the most important problems, are not accurately describing the state of shark conservation threats, and are advocating for solutions not supported by the best available scienti c data. Instances of those concerns were represented here primarily, but not exclusively, by employees of NGOs with certain shared characteristics: very small (less than 5 employees), based in North America or Europe, and employing advocates who report never reading the scienti c literature or communicating with scientists. However, it should be noted that there are some very small NGOs who regularly work with scientists in support of science-based policies (e.g., Shark Advocates International), and it should be noted that some large NGOs who employ scientists have supported limit-based policies (e.g., the Pew Charitable Trusts with Shark Sanctuaries, and Oceana with shark n trade bans), so size and interaction with scientists are clearly not the only predictors of policy preferences.
Typically (but not always), environmental policy change involves science and advocacy working together towards the same goal [16,21] and therefore it is concerning to see stark differences in message between some high-pro le shark advocacy campaigns and the policy recommendations of scienti c expertsespecially when some messaging uses demonstrably false information. Our results illustrate that despite this division, many environmental non-pro t employees work regularly with scientists, read the scienti c literature, and support science-driven policy goals. Results also point to an opportunity to bring multiple forms of expertise [see 22] and multiple perspectives to bear on conservation problems. Additionally, while scientists have previously identi ed scienti cally inaccurate claims by advocates as a problem, advocates now point to meaningful, actionable ways scientists can increase the real-world relevance of their supposedly policy-relevant research: by engaging the public, focusing on species and locations that are understudied, and committing long-term to research sites, local communities, and local scienti c capacity. Advocate expertise and experience also includes and recognizes practical dimensions sometimes underrepresented in scienti c research (e.g., while it is a scienti c fact that sustainable shark sheries can and do exist and claims to the contrary are inaccurate, some advocates accurately point out that sustainable shark sheries are uncommon, di cult to ensure, and present signi cant practical management challenges). While misrepresenting science is a problem, insights from stakeholders with diverse values, perspectives, and forms of expertise, including from those engaged in values-based approaches to advocacy, should be represented in discussions about shark conservation; the addition of these perspectives would make some conversations about conservation and management and associated trade-offs more nuanced and useful. This survey also identi es a communications problem in which some advocates may not have access to or be aware of certain scienti c data, but results also identify opportunities to address conservation problems through increased engagement between groups that too often talk past one another. Figure 1 A) Where respondents primarily work, excluding those who responded with "worldwide." B) Distribution of the size of non-pro ts (by number of employees) that respondents self-report working for. Note: The designations employed and the presentation of the material on this map do not imply the expression of any opinion whatsoever on the part of Research Square concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. This map has been provided by the authors.

Figure 2
Categorized responses to the question "What arguments does your NGO make to conserve sharks," with science-based, economics-based, or emotional arguments as possible categories. Examples of NGOs using ecosystem importance based arguments in their materials are also included Proportion of environmental advocate respondents from this study (blue) and scientists respondents from Shiffman and Hammerschlag 2016B (green) who agree with these three questions, with * indicating a signi cant difference in responses to each question between the two groups. Proportion of environmental advocate respondents who believe that sustainable sheries vs. bans should be the goal of shark conservation, broken down by regularity of reading the literature, highest degree earned, and geographic area of focus.
Page 19/21 Results of conditional inference trees for the questions "should the goal of shark conservation be sustainable sheries or total bans on sheries and trade," "do you support shark n trade bans," and "do sustainable shark sheries exist in the world today," showing primary partitioning variables for each and the results of separating the data by those partitioning variables Proportion of respondents who support, oppose, or have no opinion concerning a variety of conservation policies. All target-based traditional sheries management tools were grouped together because there were no differences in responses.

Figure 7
Proportion of respondents who support or oppose shark n bans (neutral responses/no opinion removed), broken down by regularity of reading the literature, highest degree earned, and geographic area of focus.