In 2007, the Intergovernmental Panel on Climate Change highlighted an urgent need to assess the responses of marine ecosystems to climate change1. Because they lie in a high-latitude region, the Southern Ocean ecosystems are expected to be strongly affected by global warming. Using top predators of this highly productive ocean2 (such as penguins) as integrative indicators may help us assess the impacts of climate change on marine ecosystems3, 4. Yet most available information on penguin population dynamics is based on the controversial use of flipper banding. Although some reports have found the effects of flipper bands to be deleterious5, 6, 7, 8, some short-term (one-year) studies have concluded otherwise9, 10, 11, resulting in the continuation of extensive banding schemes and the use of data sets thus collected to predict climate impact on natural populations12, 13. Here we show that banding of free-ranging king penguins (Aptenodytes patagonicus) impairs both survival and reproduction, ultimately affecting population growth rate. Over the course of a 10-year longitudinal study, banded birds produced 39% fewer chicks and had a survival rate 16% lower than non-banded birds, demonstrating a massive long-term impact of banding and thus refuting the assumption that birds will ultimately adapt to being banded6, 12. Indeed, banded birds still arrived later for breeding at the study site and had longer foraging trips even after 10 years. One of our major findings is that responses of flipper-banded penguins to climate variability (that is, changes in sea surface temperature and in the Southern Oscillation index) differ from those of non-banded birds. We show that only long-term investigations may allow an evaluation of the impact of flipper bands and that every major life-history trait can be affected, calling into question the banding schemes still going on. In addition, our understanding of the effects of climate change on marine ecosystems based on flipper-band data should be reconsidered.
At a glance
- Ocean science: under-resourced, under threat. Science 320, 1294–1295 (2008) &
- Ecological importance of the southern boundary of the Antarctic Circumpolar current. Nature 392, 708–710 (1998)
- Environmental change and Antarctic seabird populations. Science 297, 1510–1514 (2002) , &
- The pros and cons of using seabirds as ecological indicators. Clim. Res. 39, 115–129 (2009) et al.
- The potential costs of flipper-bands to penguins. Funct. Ecol. 16, 141–148 (2002) &
- Flipper-bands modify the short-term diving behaviour of Little penguins. J. Wildl. Mgmt 73, 1348–1354 (2009) , , , &
- Long-term effects of flipper-bands on penguins. Proc. R. Soc. Lond. B 271, S423–S426 (2004) et al.
- Effects of flipper-bands on foraging behavior and survival of Adélie penguins (Pygoscelis Adeliae). Auk 123, 858–869 (2006) , , &
- Effects of double bands on Magellanic penguins. J. Field Ornithol. 81, 195–205 (2010) &
- Flipper-bands do not affect foraging-trip duration of Magellanic penguins. J. Field Ornithol. 80, 408–418 (2009) &
- The effects of flipper bands on adult survival rate and reproduction in the royal penguin, Eudyptes schlegeli . Ibis 138, 557–560 (1996) , &
- Emperor penguins and climate change. Nature 411, 183–186 (2001) &
- Demographic models and IPCC climate projections predict the decline of an emperor penguin population. Proc. Natl Acad. Sci. USA 106, 1844–1847 (2009) et al.
- 261–285 (Springer, 1988) , , & in Antarctic Ocean and Resources Variability (ed. )
- Undisturbed breeding penguins as indicators of changes in marine Resources. Mar. Ecol. Prog. Ser. 95, 1–6 (1993) et al.
- Ethics and amphibians. Nature 431, 403 (2004)
- 105–125 (Oxford Univ. Press, 1991) & in Bird Population Studies: their Relevance to Conservation and Management (eds , & )
- 1992) The Evolution of Life Histories (Oxford Univ. Press,
- Patterns of variance in stage-structured populations: evolutionary predictions and ecological implications. Proc. Natl Acad. Sci. USA 95, 213–218 (1998)
- Population dynamics of large herbivores: variable recruitment with constant adult survival. Trends Ecol. Evol. 13, 58–63 (1998) , &
- The breeding biology and population-dynamics of king penguins Aptenodytes patagonica on the Crozet Islands. Ibis 134, 107–117 (1992) , &
- Seasonal effects of timing and reproduction in the king penguin: a unique breeding cycle. J. Avian Biol. 27, 7–14 (1996)
- Feeding of different species of Myctophidae in different parts of the Southern Ocean. J. Ichthyol. 29, 160–167 (1989) &
- Long-term fasting and re-feeding in penguins. Comp. Biochem. Physiol. A 128, 645–655 (2001) &
- Public information affects breeding dispersal in a colonial bird: kittiwakes cue on neighbours. Biol. Lett. 4, 538–540 (2008) , , , &
- King penguin population threatened by Southern Ocean warming. Proc. Natl Acad. Sci. USA 105, 2493–2497 (2008) et al.
- El Niño events and their relation to the southern oscillation: 1925–1986. Geophys. Res. Lett. 92, 14189–14196 (1987) &
- 18–24 (Birdlife South Africa, 2003) & in The Rehabilitation of Oiled African Penguins: A Conservation Success Story (eds & )
- The annual breeding cycle of unbanded king penguins Aptenodytes patagonicus on Possession Island (Crozet). Avian Sci. 2, 87–98 (2002) , , &
- 300–306 (Sinuaer, 2001) Matrix Population Models: Construction, Analysis and Interpretation 72–76,
- A new application for transponders in studying penguins. J. Field Ornithol. 76, 138–142 (2005) , , , &
- Is penguin banding harmless? Polar Biol. 20, 409–413 (1998) , , &
- Effect of PIT tags on the survival and recruitment of Great tits. Ardea 96, 286–292 (2009) , &
- Quelques aspects de la biologie et de l’écologie du Manchot Royal (Aptenodytes patagonicus) des îles Crozet. Com. Natl Fr. Rech. Antarct. 40, 9–51 (1976)
- The king penguin Aptenodytes patagonica of South Georgia. I. Breeding behaviour and development. Falkl. Isl. Depend. Surv. Sci. Rep. 23, 1–81 (1960)
- lme4: Linear mixed-effects models using S4 classes. CRAN - Package lme4 http://CRAN.R-project.org/package=lme4 (2009) &
- Supplementary Information (286K)
The file contains Supplementary Tables 1-3 and Supplementary Figures 1-4 with legends.