A comprehensive coastal seabird survey maps out the front lines of ecological change on the western Antarctic Peninsula

Casanovas, Paula; Naveen, Ron; Forrest, Steve; Poncet, J.; Lynch, Heather J.

doi:10.1007/s00300-015-1651-x

Cited by 29 publications

(29 citation statements)

References 30 publications

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“…Ad elie penguins demonstrated the ability to adapt their diet to different prey types according to availability throughout the Holocene, and this flexibility may aid in their longterm prospects as the Antarctic food web changes in the future. Gentoo penguins, which do not have the same tolerance for sea ice as the sympatric Ad elie penguins, rapidly colonized new breeding habitat during the Holocene as ice sheets and sea ice retreated, and a similar range expansion and abundance increase is now underway at the Antarctic Peninsula and expected to continue into the future (Lynch et al, 2012;Casanovas et al, 2015). Chinstrap penguins, which we may have expected to respond favourably to ice sheet and sea ice retreat based on the available palaeoecological data, are currently in decline across their distribution (Trivelpiece et al, 2011;Lynch et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

The influence of historical climate changes on Southern Ocean marine predator populations: a comparative analysis

Younger

Emmerson

Miller

2015

Global Change Biology

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The Southern Ocean ecosystem is undergoing rapid physical and biological changes that are likely to have profound implications for higher-order predators. Here, we compare the long-term, historical responses of Southern Ocean predators to climate change. We examine palaeoecological evidence for changes in the abundance and distribution of seabirds and marine mammals, and place these into context with palaeoclimate records in order to identify key environmental drivers associated with population changes. Our synthesis revealed two key factors underlying Southern Ocean predator population changes; (i) the availability of ice-free ground for breeding and (ii) access to productive foraging grounds. The processes of glaciation and sea ice fluctuation were key; the distributions and abundances of elephant seals, snow petrels, gentoo, chinstrap and Adélie penguins all responded strongly to the emergence of new breeding habitat coincident with deglaciation and reductions in sea ice. Access to productive foraging grounds was another limiting factor, with snow petrels, king and emperor penguins all affected by reduced prey availability in the past. Several species were isolated in glacial refugia and there is evidence that refuge populations were supported by polynyas. While the underlying drivers of population change were similar across most Southern Ocean predators, the individual responses of species to environmental change varied because of species specific factors such as dispersal ability and environmental sensitivity. Such interspecific differences are likely to affect the future climate change responses of Southern Ocean marine predators and should be considered in conservation plans. Comparative palaeoecological studies are a valuable source of long-term data on species' responses to environmental change that can provide important insights into future climate change responses. This synthesis highlights the importance of protecting productive foraging grounds proximate to breeding locations, as well as the potential role of polynyas as future Southern Ocean refugia.

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Section: Discussionmentioning

confidence: 99%

The influence of historical climate changes on Southern Ocean marine predator populations: a comparative analysis

Younger

Emmerson

Miller

2015

Global Change Biology

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“…), while Adélie and Chinstrap populations are declining in the region north of Marguerite Bay (Casanovas et al. ), possibly because of differential survival rather than reproductive success (Lynch et al. ).…”

Section: Introductionmentioning

confidence: 99%

“…At present, Gentoo penguin (Pygoscelis papua, depicted in Fig. 1) populations are increasing and moving south (Lynch et al 2012), while Ad elie and Chinstrap populations are declining in the region north of Marguerite Bay (Casanovas et al 2015), possibly because of differential survival rather than reproductive success (Lynch et al 2010). Understanding the genetic structure of these populations is important for interpreting whether changes in population size result from changes in local survival and recruitment or, alternatively, migration.…”

Section: Introductionmentioning

confidence: 99%

Population structure and phylogeography of the Gentoo Penguin (Pygoscelis papua) across the Scotia Arc

Levy

Clucas

Rogers

et al. 2016

Ecology and Evolution

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Climate change, fisheries' pressure on penguin prey, and direct human disturbance of wildlife have all been implicated in causing large shifts in the abundance and distribution of penguins in the Southern Ocean. Without mark‐recapture studies, understanding how colonies form and, by extension, how ranges shift is challenging. Genetic studies, particularly focused on newly established colonies, provide a snapshot of colonization and can reveal the extent to which shifts in abundance and occupancy result from changes in demographic rates (e.g., reproduction and survival) or migration among suitable patches of habitat. Here, we describe the population structure of a colonial seabird breeding across a large latitudinal range in the Southern Ocean. Using multilocus microsatellite genotype data from 510 Gentoo penguin (Pygoscelis papua) individuals from 14 colonies along the Scotia Arc and Antarctic Peninsula, together with mitochondrial DNA data, we find strong genetic differentiation between colonies north and south of the Polar Front, that coincides geographically with the taxonomic boundary separating the subspecies P. p. papua and P. p. ellsworthii. Using a discrete Bayesian phylogeographic approach, we show that southern Gentoos expanded from a possible glacial refuge in the center of their current range, colonizing regions to the north and south through rare, long‐distance dispersal. Our findings show that this dispersal is important for new colony foundation and range expansion in a seabird species that ordinarily exhibits high levels of natal philopatry, though persistent oceanographic features serve as barriers to movement.

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“…近年来, 典型区域野外调查的方式成为研究不同类型企鹅数量的重要手段. Casanovas等人 [67] [25] 基于直升机航拍数据和地面实测 [9,10] 指出, 罗斯海周边阿德利企鹅聚居区粪便颜色与周围其他地貌特征不同, 企鹅粪区的像元数目与企鹅数量之间存在一定的相关性. LaRue等人 [13,23] 和 Lynch等人 [18] Table 2 The danger level of penguin populations in Antarctica and their response to climate change (According to the adaptation of Forcada and Trathan [50] )…”

Section: 帝企鹅生活在海冰或冰架上其识别难度相对unclassified

“…2000年之后呈现升高的趋势, 竞争对手洋枪鱼数量是导致企鹅数量增加的主要因素 [25] . 海洋中叶绿素a 浓度是体现磷虾食物来源海藻的重要表征, 结果发现罗斯海区域叶绿素a浓度呈现逐年增高的趋势, 有利于企鹅捕食与生存 [67,69] .…”

Section: 海南部企鹅聚居地数量在2000年前呈现降低的趋势气候因子和鲸鱼数量是影响企鹅变化的主要原因;unclassified

Application of very high resolution remote sensing data in studies of Antarctic penguins and greenhouse gases: A review

Li¹,

He²,

Cheng³

et al. 2017

Chin. Sci. Bull.

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A comprehensive coastal seabird survey maps out the front lines of ecological change on the western Antarctic Peninsula

Cited by 29 publications

References 30 publications

The influence of historical climate changes on Southern Ocean marine predator populations: a comparative analysis

The influence of historical climate changes on Southern Ocean marine predator populations: a comparative analysis

Population structure and phylogeography of the Gentoo Penguin (Pygoscelis papua) across the Scotia Arc

Application of very high resolution remote sensing data in studies of Antarctic penguins and greenhouse gases: A review

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