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| Open AccessMate choice in fruit flies is rational and adaptive
A characteristic of rational behaviour is that it is transitive, such that preferences are ranked in a strict linear order. Here, Arbuthnott and colleagues show that mate choice in the fruit fly,Drosophila melanogaster, is transitive at the population level and that preferred mates produce more offspring.
- Devin Arbuthnott
- , Tatyana Y. Fedina
- & Daniel E. L. Promislow
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Article
| Open AccessLimiting parental feedback disrupts vocal development in marmoset monkeys
The development of mature vocal patterns is shaped by parental influence in many animals. Here, Gultekin and Hage show that parental feedback not only influences vocal development, but is indeed necessary for juvenile marmosets to acquire normal vocal behaviour.
- Yasemin B. Gultekin
- & Steffen R. Hage
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Article
| Open AccessEvidence for social parasitism of early insect societies by Cretaceous rove beetles
Social insects are commonly parasitized by beetles that live inside colonies and consume nest resources or even the brood. Here, Yamamotoet al. present fossil evidence that social parasitism by beetles dates back at least 99 million years—contemporaneous with the earliest fossil indications of ant and termite eusociality.
- Shûhei Yamamoto
- , Munetoshi Maruyama
- & Joseph Parker
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Article
| Open AccessWater striders adjust leg movement speed to optimize takeoff velocity for their morphology
How water striders escape from danger by jumping vertically from the water surface without sinking is an open question in biomechanics. Yanget al. show that water strider species with varying leg lengths and body masses tune their leg movements to maximize jump speeds without breaking the surface of the water.
- Eunjin Yang
- , Jae Hak Son
- & Ho-Young Kim
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Article
| Open AccessSocial support reduces stress hormone levels in wild chimpanzees across stressful events and everyday affiliations
The stress-reducing effects of social bonds have been hypothesized to accrue either during stressful events or across daily affiliations. Here, Wittiget al. show that the presence of social partners reduces levels of stress hormones in wild chimpanzees beyond stressful contexts, supporting the latter hypothesis.
- Roman M. Wittig
- , Catherine Crockford
- & Klaus Zuberbühler
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| Open AccessEvolutionary trajectories of snake genes and genomes revealed by comparative analyses of five-pacer viper
Snakes have many characteristics that distinguish them from their relatives. Here, Yin et al. sequence the genome of the five-pacer viper, Deinagkistrodon acutus, and use comparative genomic analyses to elucidate the evolution of transposable elements, developmental genes and sex chromosomes in snakes.
- Wei Yin
- , Zong-ji Wang
- & Qi Zhou
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Article
| Open AccessMassive yet grossly underestimated global costs of invasive insects
Invasive insects impose many economic costs, for example by consuming crops and spreading disease. Here, Bradshaw et al. compile a database of the costs of invasive insects and conservatively estimate that the yearly global cost (in 2014-equivalent US dollars) is at least $70 billion for goods and services and $6.9 billion for human health.
- Corey J. A. Bradshaw
- , Boris Leroy
- & Franck Courchamp
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| Open AccessOrganization of olfactory centres in the malaria mosquito Anopheles gambiae
Mosquitoes use olfactory cues to locate their host. Here, Riabinina et al. use genetic labelling of olfactory receptor neurons in the malaria vector Anopheles gambiaeto show that these neurons project to the antennal lobe, a known insect olfactory centre, and the subesophageal zone, a region previously linked to gustatory processing.
- Olena Riabinina
- , Darya Task
- & Christopher J. Potter
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Article
| Open AccessExtremotolerant tardigrade genome and improved radiotolerance of human cultured cells by tardigrade-unique protein
Tardigrades are resistant to extreme environmental conditions including dehydration, radiation and the vacuum of space. Here the authors present a high-quality genome which displays minimal horizontal gene transfer, and identify the unique tardigrade protein Dsup which suppresses DNA damage.
- Takuma Hashimoto
- , Daiki D. Horikawa
- & Takekazu Kunieda
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| Open AccessThe evolution of acoustic size exaggeration in terrestrial mammals
The acoustic properties of vocal signals generally depend on body size, but in some species males have traits that exaggerate the size conveyed by their vocal signals. Here, Charlton and Reby show that among terrestrial mammals, species with sexual selection for large male body size also have more exaggerated vocal signals for their size.
- Benjamin D. Charlton
- & David Reby
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Article
| Open AccessTectonic collision and uplift of Wallacea triggered the global songbird radiation
Songbirds originated in Australia and have now diversified into approximately 5,000 species found across the world. Here, Moyle et al. combine phylogenomic and biogeographic analyses to show that songbird diversification was associated with the formation of islands providing a route out of Australia.
- Robert G. Moyle
- , Carl H. Oliveros
- & Brant C. Faircloth
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Article
| Open AccessThe suppression of Antarctic bottom water formation by melting ice shelves in Prydz Bay
Antarctic bottom water (AABW) production is critical to the global ocean overturning circulation. Here, the authors show new observations of AABW formation from seal CTD data in Prydz Bay, East Antarctica that highlights its susceptibility to increased freshwater input from the melting of ice shelves.
- G. D. Williams
- , L. Herraiz-Borreguero
- & M. Hindell
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Article
| Open AccessOvarian fluid allows directional cryptic female choice despite external fertilization
In some species with internal fertilization, females can mate with multiple males and then manipulate which sperm fertilize the eggs. Here, Alonzo et al.find that by releasing ovarian fluid along with their eggs, female ocellated wrasse are able to influence paternity despite having external fertilization.
- Suzanne H. Alonzo
- , Kelly A. Stiver
- & Susan E. Marsh-Rollo
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Article
| Open AccessChromatin remodelling and antisense-mediated up-regulation of the developmental switch gene eud-1 control predatory feeding plasticity
In the nematode Pristionchus pacificus, a developmental switch, the sulfatase eud-1, controls mouth-form plasticity. Here, the authors show that mutations in two conserved histone modifying enzymes mimic the eud-1 phenotype, in part mediated by an antisense eud-1RNA, resulting in the absence of one mouth-form
- Vahan Serobyan
- , Hua Xiao
- & Ralf J. Sommer
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Article
| Open AccessNotch signalling mediates reproductive constraint in the adult worker honeybee
In honeybees, pheromones produced by the queen inhibit reproduction by workers and enforce a eusocial division of labour. Here, Duncan, Hyink and Dearden show that this inhibition is mediated by the Notch signalling pathway in the workers' ovaries.
- Elizabeth J. Duncan
- , Otto Hyink
- & Peter K. Dearden
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Article
| Open AccessAscarosides coordinate the dispersal of a plant-parasitic nematode with the metamorphosis of its vector beetle
Many species of nematodes use pheromones called ascarosides to coordinate their behaviour and development. Here, Zhao et al. demonstrate that the beetle vector of the pinewood nematode (Bursaphelenchus xylophilus) also uses and responds to ascarosides in its interactions with the nematodes.
- Lilin Zhao
- , Xinxing Zhang
- & Jianghua Sun
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Article
| Open AccessGreat hammerhead sharks swim on their side to reduce transport costs
Sharks’ dorsal fins are thought to assist propulsion and turns while pectoral fins are thought to oppose sharks’ negative buoyancy. Here, Payne and colleagues show that hammerhead sharks use an exaggerated dorsal fin to generate lift by swimming on their side.
- Nicholas L. Payne
- , Gil Iosilevskii
- & Yuuki Y. Watanabe
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Article
| Open AccessDynamic polarization vision in mantis shrimps
Mantis shrimps are known to display large pitch, yaw and torsional eye rotations. Here, the authors show that these eye movements allow mantis shrimp to orientate particular photoreceptors in order to better discriminate the polarization of light.
- Ilse M. Daly
- , Martin J. How
- & Nicholas W. Roberts
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Article
| Open AccessNeonatal face-to-face interactions promote later social behaviour in infant rhesus monkeys
Like humans, neonatal primates engage in face-to-face interactions with their mothers from an early age. Dettmer and colleagues demonstrate that in monkeys, increasing neonatal face-to-face interactions enhances social interest in infants of two and five months.
- Amanda M. Dettmer
- , Stefano S. K. Kaburu
- & Pier F. Ferrari
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| Open AccessMale care and life history traits in mammals
Males help care for offspring in about 10% of mammal species. Here, West and Capellini perform phylogenetic comparative analyses on a sample of 529 mammal species and find that male care is associated with shorter lactation periods by females, larger litters of offspring, and more frequent breeding events.
- Hannah E. R. West
- & Isabella Capellini
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Article
| Open AccessWolbachia infections in natural Anopheles populations affect egg laying and negatively correlate with Plasmodium development
Wolbachia bacteria infect insects and could potentially be used to control populations of malaria-transmitting mosquitoes. Here, the authors provide evidence that natural Wolbachia infections affect the rate of egg laying and are associated with reduced presence of malaria parasites in Anophelesmosquitoes.
- W. Robert Shaw
- , Perrine Marcenac
- & Flaminia Catteruccia
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| Open AccessPotent social synchronization can override photic entrainment of circadian rhythms
Circadian rhythms synchronize important biological processes, and are thought to primarily be entrained by environmental cycles in light and temperature, with little or no role for social interactions. Here, Fuchikawa et al. show that social cues among honeybees can entrain these rhythms even in the presence of conflicting light-dark cycles.
- Taro Fuchikawa
- , Ada Eban-Rothschild
- & Guy Bloch
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Article
| Open AccessFitness consequences of artificial selection on relative male genital size
Within species, there tends to be a tight relationship between genital size and body size, suggesting strong stabilizing selection. Here, Booksmythe et al.artificially select relative genital size in mosquitofish and find that novel genital size-body size combinations do not lead to expected fitness reductions.
- Isobel Booksmythe
- , Megan L. Head
- & Michael D. Jennions
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Article
| Open AccessPhysiological constraints to climate warming in fish follow principles of plastic floors and concrete ceilings
Understanding climatic adaptation in fish is limited by a lack of large-scale, long term acclimation studies. Here, Sandblom et al. show that fish exposed to a 5-10 °C increase in water temperature next to a nuclear power plant display contrasting upper and lower cardiorespiratory thermal compensation limits.
- Erik Sandblom
- , Timothy D. Clark
- & Fredrik Jutfelt
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Article
| Open AccessGiraffe genome sequence reveals clues to its unique morphology and physiology
Giraffe’s unique anatomy and physiology include its stature and associated cardiovascular adaptation. Here, Douglas Cavener and colleagues provide de novogenome assemblies of giraffe and its closest relative okapi and provide comparative analyses to infer insights into evolution and adaptation.
- Morris Agaba
- , Edson Ishengoma
- & Douglas R. Cavener
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Article
| Open AccessInnate olfactory preferences for flowers matching proboscis length ensure optimal energy gain in a hawkmoth
Foraging is energetically demanding for animals like hawkmoths that feed while flying. Here, Haverkamp et al. show that Manduca sexta has an innate preference for feeding on species of Nicotianawhose flower corolla length best matches the length of their proboscis, which allowed more efficient foraging and yielded the highest caloric gain.
- Alexander Haverkamp
- , Julia Bing
- & Markus Knaden
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Article
| Open AccessCoral snakes predict the evolution of mimicry across New World snakes
Toxic and venomous species often have conspicuous warning colouration that is mimicked by harmless species. Here, Davis Rabosky et al. combine phylogenetic and biogeographic analyses to reveal that mimicry of venomous coral snakes has been a major driver of snake colour evolution in the New World.
- Alison R. Davis Rabosky
- , Christian L. Cox
- & Jimmy A. McGuire
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Article
| Open AccessCumulative early life adversity predicts longevity in wild baboons
Adverse early life experiences can have negative consequences for health and survival in later life. Here, Tung et al. show that in female baboons, the cumulative number of adverse experiences can be a strong predictor of lifespan.
- Jenny Tung
- , Elizabeth A. Archie
- & Susan C. Alberts
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| Open AccessViviparity stimulates diversification in an order of fish
Live birth and an annual life cycle potentially enable access to new ecological niches and subsequent species diversification. Here, Helmstetter et al.build the phylogeny for fish in the order Cyprinodontiformes and find that, though live birth and annualism have each evolved multiple times, only live birth is associated with increased diversification.
- Andrew J. Helmstetter
- , Alexander S. T. Papadopulos
- & Vincent Savolainen
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| Open AccessFish mouths as engineering structures for vortical cross-step filtration
Suspension-feeding fish, such as goldfish and whale sharks, retain prey without clogging their oral filter. Using a cross-step filtration model based on fish morphology, Sanderson et al. show how vortices generated by this design could trap and transport particles even smaller than the filter pores.
- S. Laurie Sanderson
- , Erin Roberts
- & Hannah Brooks
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| Open AccessEnergy cost and return for hunting in African wild dogs and cheetahs
The long-distance hunting behaviour of African wild dogs is thought to be energetically costly. Here, Hubel et al. show that multiple opportunistic short-distance hunts and group feeding make African wild dogs in mixed woodland savannah energetically robust.
- Tatjana Y. Hubel
- , Julia P. Myatt
- & Alan M. Wilson
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| Open AccessUnpredictable environments lead to the evolution of parental neglect in birds
The response of parents to offspring begging behaviour is hugely variable in birds, but what mediates this response is not known. In a meta-analysis across 143 species, Caro et al. show that variation in offspring begging and parental care is a function of environmental quality and predictability.
- Shana M. Caro
- , Ashleigh S. Griffin
- & Stuart A. West
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| Open AccessAdditive opportunistic capture explains group hunting benefits in African wild dogs
African wild dogs hunt collaboratively over long distances in grassland plains. Hubel et al. use high-resolution GPS to show that in their remaining habitat of mixed woodland savannah, African wild dogs use multiple opportunistic short-distance hunts, with no evidence of cooperative chasing.
- Tatjana Y. Hubel
- , Julia P. Myatt
- & Alan M. Wilson
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Article
| Open AccessFish optimize sensing and respiration during undulatory swimming
Head movements of swimming fishes are thought to exist only because of recoil of the oscillating tail. Here, Akanyeti et al. show that by controlling the timing of head movements, fish can improve their swimming efficiency while simultaneously optimizing sensing and respiration.
- O. Akanyeti
- , P. J. M. Thornycroft
- & J. C. Liao
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| Open AccessA hormone-related female anti-aphrodisiac signals temporary infertility and causes sexual abstinence to synchronize parental care
Parents are faced with the dilemma whether to invest in their current offspring, or potential future young. Here, Engel et al. show that nutritionally-dependent young induce temporary infertility in female burying beetles, which in turn is signalled to the male partner via a hormone-related anti-aphrodisiac.
- Katharina C. Engel
- , Johannes Stökl
- & Sandra Steiger
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Article
| Open AccessExperimental evidence for compositional syntax in bird calls
Animal vocalizations contain distinct elements, but it is not clear whether they convey combined meanings in the same way as human speech. Here, Suzuki et al.show that Japanese great tits can combine different elements of vocal signals so that they have compositional syntax.
- Toshitaka N. Suzuki
- , David Wheatcroft
- & Michael Griesser
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Article
| Open AccessEnhanced flight performance by genetic manipulation of wing shape in Drosophila
Insect wings are under multiple competing selection pressures, but which are important in natural populations is not clear. Using RNAi to modify wing shape, Ray et al. show that aerial agility can be significantly enhanced in Drosophila, suggesting that natural variation does not reflect an optimization solely for flight agility.
- Robert P. Ray
- , Toshiyuki Nakata
- & Richard J. Bomphrey
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Article
| Open AccessMechanical evidence that Australopithecus sediba was limited in its ability to eat hard foods
Dietary adaptations of extinct early humans are often inferred from dental microwear data. Here, the authors employ mechanical analyses to show that Australopithecus sedibahad limited ability to consume hard foods.
- Justin A. Ledogar
- , Amanda L. Smith
- & David S. Strait
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Article
| Open AccessAnthropogenic noise increases fish mortality by predation
Little evidence exists on whether human-generated noise directly affects survival of wildlife. Here, Simpson et al. show that damselfish exposed to motorboat noise have elevated metabolic rates, reduced responses to predatory attacks, and suffer increased predation compared to fish in ambient conditions.
- Stephen D. Simpson
- , Andrew N. Radford
- & Mark G. Meekan
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Article
| Open AccessMarine mammals harbor unique microbiotas shaped by and yet distinct from the sea
Little is known about the microbiota of marine mammals, despite the crucial ecological roles played by these animals. Here, Bik et al. describe the bacterial communities associated with various body sites in dolphins and sea lions, as well as the microbiota of their dietary fish and adjacent seawater.
- Elisabeth M. Bik
- , Elizabeth K. Costello
- & David A. Relman
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Article
| Open AccessUnique features of a global human ectoparasite identified through sequencing of the bed bug genome
The bed bug, Cimex lectularius, is a ubiquitous human ectoparasite with global distribution. Here, the authors sequence the genome of the bed bug and identify reductions in chemosensory genes, expansion of genes associated with blood digestion and genes linked to pesticide resistance.
- Joshua B. Benoit
- , Zach N. Adelman
- & Stephen Richards
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Article
| Open AccessRavens attribute visual access to unseen competitors
Theory of Mind experiments in animals have not previously discounted the possibility that individuals follow their competitors′ behavioural cues. Here, Bugnyar et al.show that ravens consider the possibility that they are being watched when caching food, even when they cannot see a conspecific competitor.
- Thomas Bugnyar
- , Stephan A. Reber
- & Cameron Buckner
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Article
| Open AccessGenome assembly and geospatial phylogenomics of the bed bug Cimex lectularius
The common bedbug is a pest for humans, yet its molecular biology is poorly understood. Here, the authors sequence the common bedbug genome and profile gene expression across all life stages to show major changes in gene expression after feeding on human blood.
- Jeffrey A. Rosenfeld
- , Darryl Reeves
- & Christopher E. Mason
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Article
| Open AccessExceptional preservation of eye structure in arthropod visual predators from the Middle Jurassic
Understanding how ancient animals perceived their environment is difficult due to a lack of fossilized eye structures. Here, the authors reconstruct the compound eye of a 160-million-year old thylacocephalan arthropod, Dollocaris, finding evidence of hunting adaptations.
- Jean Vannier
- , Brigitte Schoenemann
- & Euan Clarkson
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| Open AccessAncient origin and maternal inheritance of blue cuckoo eggs
The common cuckoo lays its eggs in nests of a variety of species and their eggs mimic the ones of their hosts. Here, the authors show that blue egg colouration in the common cuckoo is maternally inherited, originated in Asia and then expanded to Europe.
- Frode Fossøy
- , Michael D Sorenson
- & Bård G Stokke
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| Open AccessYak whole-genome resequencing reveals domestication signatures and prehistoric population expansions
Based on whole genome resequencing of more than 80 wild and domestic yaks from high-altitude Qinghai-Tibet Plateau, this study recovers demographic and genetic processes underlying the domestication of this animal. Qiu et al.also identify genes and associated pathways as candidates for selection during the domestication process.
- Qiang Qiu
- , Lizhong Wang
- & Jianquan Liu
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Article
| Open AccessAppetitive floral odours prevent aggression in honeybees
Honeybee olfactory systems may experience conflicting cues from communication- and foraging-related odours. Here, Nouvian et al.find that appetitive signals from floral compounds can reduce aggression by blocking the recruitment to defence triggered by alarm pheromones, and that this is not due to odourant masking.
- Morgane Nouvian
- , Lucie Hotier
- & Judith Reinhard
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Article
| Open AccessFree mate choice enhances conservation breeding in the endangered giant panda
Ex situ conservation breeding programmes for endangered species are expensive, and not always guaranteed to succeed. Here, Martin-Wintle et al.show that when captive giant pandas are given the opportunity to choose their preferred mate, copulation and birth rates increase significantly.
- Meghan S. Martin-Wintle
- , David Shepherdson
- & Ronald R. Swaisgood
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| Open AccessUniversal mechanisms of sound production and control in birds and mammals
In contrast to the larynx of mammals, birds produce sound using a unique vocal organ called the syrinx. Using ex vivo preparations, Elemans et al.show that, despite large anatomical differences, sound production across a range of avian taxa is via the myoelastic-aerodynamic mechanism, the same mechanism involved in human speech.
- C.P.H Elemans
- , J.H. Rasmussen
- & J.G. Švec