Search Results - "BALLARD, GRANT"

Multidrone aerial surveys of penguin colonies in Antarctica by Shah, Kunal, Ballard, Grant, Schmidt, Annie, Schwager, Mac

“…Speed is essential in wildlife surveys due to the dynamic movement of animals throughout their environment and potentially extreme changes in weather. In this…”
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Coexistence of mesopredators in an intact polar ocean ecosystem: The basis for defining a Ross Sea marine protected area by Ballard, Grant, Jongsomjit, Dennis, Veloz, Samuel D., Ainley, David G.

“…► We document the environmental niches of 9 of 13 mesopredator species in the Ross Sea. ► Species had high environmental niche overlap, but low overlap in…”
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Foraging dive frequency predicts body mass gain in the Adélie penguin by Lescroël, Amélie, Schmidt, Annie, Elrod, Megan, Ainley, David G., Ballard, Grant

“…Quantifying food intake in wild animals is crucial to many ecological and evolutionary questions, yet it can be very challenging, especially in the marine…”
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Trends in the breeding population of Adélie penguins in the Ross Sea, 1981-2012: a coincidence of climate and resource extraction effects by Lyver, Phil O'B, Barron, Mandy, Barton, Kerry J, Ainley, David G, Pollard, Annie, Gordon, Shulamit, McNeill, Stephen, Ballard, Grant, Wilson, Peter R

“…Measurements of the size of Adélie penguin (Pygoscelis adeliae) colonies of the southern Ross Sea are among the longest biologic time series in the Antarctic…”
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The influence of subcolony-scale nesting habitat on the reproductive success of Adélie penguins by Schmidt, Annie E., Ballard, Grant, Lescroël, Amélie, Dugger, Katie M., Jongsomjit, Dennis, Elrod, Megan L., Ainley, David G.

“…Group-size variation is common in colonially breeding species, including seabirds, whose breeding colonies can vary in size by several orders of magnitude…”
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Sex-Based Differences in Adélie Penguin (Pygoscelis adeliae) Chick Growth Rates and Diet by Jennings, Scott, Varsani, Arvind, Dugger, Katie M, Ballard, Grant, Ainley, David G

“…Sexually size-dimorphic species must show some difference between the sexes in growth rate and/or length of growing period. Such differences in growth…”
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Antarctic climate change: extreme events disrupt plastic phenotypic response in Adélie penguins by Lescroël, Amélie, Ballard, Grant, Grémillet, David, Authier, Matthieu, Ainley, David G

“…In the context of predicted alteration of sea ice cover and increased frequency of extreme events, it is especially timely to investigate plasticity within…”
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Survival differences and the effect of environmental instability on breeding dispersal in an Adélie penguin meta-population by Dugger, Katie M, Ainley, David G, Lyver, Phil O'B, Barton, Kerry, Ballard, Grant

“…High survival and breeding philopatry was previously confirmed for the Adélie penguin (Pygoscelis adeliae) during a period of stable environmental conditions…”
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Climate change winners: receding ice fields facilitate colony expansion and altered dynamics in an Adélie penguin metapopulation by LaRue, Michelle A, Ainley, David G, Swanson, Matt, Dugger, Katie M, Lyver, Phil O'B, Barton, Kerry, Ballard, Grant

“…There will be winners and losers as climate change alters the habitats of polar organisms. For an Adélie penguin (Pygoscelis adeliae) colony on Beaufort Island…”
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Effects of individual quality, reproductive success and environmental variability on survival of a long-lived seabird by Lescroël, Amélie, Dugger, Katie M., Ballard, Grant, Ainley, David G.

“…1. Heterogeneity in individual quality (i.e. individuals having different performance levels that are consistent throughout life) can drive the demography of…”
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Working less to gain more: when breeding quality relates to foraging efficiency by Lescroël, Amélie, Ballard, Grant, Toniolo, Viola, Barton, Kerry J., Wilson, Peter R., Lyver, Philip O'B., Ainley, David G.

“…In animal populations, a minority of individuals consistently achieves the highest breeding success and therefore contributes the most recruits to future…”
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Sex‐specific recruitment rates contribute to male‐biased sex ratio in Adélie penguins by Morandini, Virginia, Dugger, Katie M., Schmidt, Annie E., Varsani, Arvind, Lescroël, Amélie, Ballard, Grant, Lyver, Phil O'B., Barton, Kerry, Ainley, David G.

“…Sex‐related differences in vital rates that drive population change reflect the basic life history of a species. However, for visually monomorphic bird…”
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Circumpolar analysis of the Adélie Penguin reveals the importance of environmental variability in phenological mismatch by Youngflesh, Casey, Jenouvrier, Stephanie, Li, Yun, Ji, Rubao, Ainley, David G., Ballard, Grant, Barbraud, Christophe, Delord, Karine, Dugger, Katie M., Emmerson, Louise M., Fraser, William R., Hinke, Jefferson T., Lyver, Phil O'B., Olmastroni, Silvia, Southwell, Colin J., Trivelpiece, Susan G., Trivelpiece, Wayne Z., Lynch, Heather J.

“…Evidence of climate-change-driven shifts in plant and animal phenology have raised concerns that certain trophic interactions may be increasingly mismatched in…”
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Identification of a Novel Adélie Penguin Circovirus at Cape Crozier (Ross Island, Antarctica) by Morandini, Virginia, Dugger, Katie M, Ballard, Grant, Elrod, Megan, Schmidt, Annie, Ruoppolo, Valeria, Lescroël, Amélie, Jongsomjit, Dennis, Massaro, Melanie, Pennycook, Jean, Kooyman, Gerald L, Schmidlin, Kara, Kraberger, Simona, Ainley, David G, Varsani, Arvind

“…Understanding the causes of disease in Antarctic wildlife is crucial, as many of these species are already threatened by environmental changes brought about by…”
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Responding to climate change: Adélie Penguins confront astronomical and ocean boundaries by Ballard, Grant, Toniolo, Viola, Ainley, David G, Parkinson, Claire L, Arrigo, Kevin R, Trathan, Phil N

“…Long-distance migration enables many organisms to take advantage of lucrative breeding and feeding opportunities during summer at high latitudes and then to…”
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An energetic correlate between colony size and foraging effort in seabirds, an example of the Adélie penguin Pygoscelis adeliae by Ballance, Lisa T., Ainley, David G., Ballard, Grant, Barton, Kerry

“…Central-place foraging seabirds alter the availability of their prey around colonies, forming a "halo" of reduced prey access that ultimately constrains…”
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Non-consumptive factors affecting foraging patterns in Antarctic penguins: a review and synthesis by Ainley, David G., Ballard, Grant

“…Recent research has clearly shown that the fear of predation, i.e. aversion to taking risks, among mesopredators or grazers, and not merely flight from an apex…”
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Testing assumptions of central place foraging theory: a study of Adélie penguins Pygoscelis adeliae in the Ross Sea by Ford, R. Glenn, Ainley, David G, Lescroël, Amelie, Lyver, Phil O'B, Toniolo, Viola, Ballard, Grant

“…We investigated central place foraging (CPF) in the context of optimal foraging theory in Adélie penguins Pygoscelis adeliae of the southern Ross Sea by using…”
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Modeling the relationship of Antarctic minke whales to major ocean boundaries by Ainley, David G., Jongsomjit, Dennis, Ballard, Grant, Thiele, Deborah, Fraser, William R., Tynan, Cynthia T.

“…The population size of Antarctic minke whales Balaenoptera bonaerensis has been changing simultaneously with profound changes in the physics, i.e.,…”
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Impacts of cetaceans on the structure of Southern Ocean food webs by Ainley, David, Ballard, Grant, Blight, Louise K, Ackley, Steve, Emslie, Steven D, Lescroël, Amélie, Olmastroni, Silvia, Townsend, Susan E, Tynan, Cynthia T, Wilson, Peter, Woehler, Eric

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