Genetic Consequences of Dispersal, Philopatry and Reproductive Behaviors

Bonin, Carolina A.

doi:10.1007/978-3-030-59184-7_11

Cited by 1 publication

(4 citation statements)

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“…In addition to various population-growth models, a variety of concepts have historically been applied to describe and predict post-exploitation recolonization processes by pinnipeds (Bonin, 2021). Roux (1987) proposed a phased system for fur seals.…”

Section: Reevaluating the Antarctic Fur Seal Recolonization Hypothesismentioning

confidence: 99%

“…Phase II, or establishment, is characterized by the formation of observable breeding colonies; however, densities and therefore population increase, remain relatively low (<10% per annum). Phase III, or recolonization, describes a positive density-dependent mechanism where core colonies reach maximum density and drive "spill over" from highly populated colonies to nearby, unoccupied sites (Gaggiotti et al, 2002;Bonin, 2021). This process allows young breeders to escape harassment and increase their chance of successful mating (Grandi et al, 2008).…”

Section: Reevaluating the Antarctic Fur Seal Recolonization Hypothesismentioning

confidence: 99%

“…However, pre-1980 estimates of population growth rates (Table 1) were based on very few individuals (12-83 pups, Supplementary Table 1), and the surveys conducted during that period did not include the San Telmo Islets, which are within 1 km, and were later shown to produce more pups than Cape Shirreff until the 1990s (Croll et al, 1992). Although AFS adult females are highly philopatric, dispersal from high-density breeding beaches to adjacent, low-density beaches is common (Roux, 1987;Boyd, 1993;Bonin, 2021). Further, movement of breeding females between the San Telmo Islets and Cape Shirreff has been observed (Hucke-Gaete et al, 2004), suggesting that the earliest estimates of population growth may have reflected movement within the SSI rather than from SG, over 1,500 km away.…”

Section: Reevaluating the Antarctic Fur Seal Recolonization Hypothesismentioning

confidence: 99%

“…The existence of one or more refugia in the SSI not only fueled recolonization, but also preserved high levels of genetic diversity within the species as a whole (Paijmans et al, 2020;Bonin, 2021). In general, "edge" populations are crucial for stabilizing population growth and stability (Rehm et al, 2015).…”

Section: Extreme Genetic Diversity At the Edgementioning

confidence: 99%

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The Rapid Population Collapse of a Key Marine Predator in the Northern Antarctic Peninsula Endangers Genetic Diversity and Resilience to Climate Change

et al. 2022

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Antarctic fur seals (AFS) are an ecologically important predator and a focal indicator species for ecosystem-based Antarctic fisheries management. This species suffered intensive anthropogenic exploitation until the early 1900s, but recolonized most of its former distribution, including the southern-most colony at Cape Shirreff, South Shetland Islands (SSI). The IUCN describes a single, global AFS population of least concern; however, extensive genetic analyses clearly identify four distinct breeding stocks, including one in the SSI. To update the population status of SSI AFS, we analyzed 20 years of field-based data including population counts, body size and condition, natality, recruitment, foraging behaviors, return rates, and pup mortality at the largest SSI colony. Our findings show a precipitous decline in AFS abundance (86% decrease since 2007), likely driven by leopard seal predation (increasing since 2001, p << 0.001) and potentially worsening summer foraging conditions. We estimated that leopard seals consumed an average of 69.3% (range: 50.3–80.9%) of all AFS pups born each year since 2010. AFS foraging-trip durations, an index of their foraging habitat quality, were consistent with decreasing krill and fish availability. Significant improvement in the age-specific over-winter body condition of AFS indicates that observed population declines are driven by processes local to the northern Antarctic Peninsula. The loss of SSI AFS would substantially reduce the genetic diversity of the species, and decrease its resilience to climate change. There is an urgent need to reevaluate the conservation status of Antarctic fur seals, particularly for the rapidly declining SSI population.

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Section: Reevaluating the Antarctic Fur Seal Recolonization Hypothesismentioning

confidence: 99%

Section: Reevaluating the Antarctic Fur Seal Recolonization Hypothesismentioning

confidence: 99%

Section: Reevaluating the Antarctic Fur Seal Recolonization Hypothesismentioning

confidence: 99%

Section: Extreme Genetic Diversity At the Edgementioning

confidence: 99%

See 2 more Smart Citations

The Rapid Population Collapse of a Key Marine Predator in the Northern Antarctic Peninsula Endangers Genetic Diversity and Resilience to Climate Change

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

Genetic Consequences of Dispersal, Philopatry and Reproductive Behaviors

Cited by 1 publication

References 85 publications

The Rapid Population Collapse of a Key Marine Predator in the Northern Antarctic Peninsula Endangers Genetic Diversity and Resilience to Climate Change

The Rapid Population Collapse of a Key Marine Predator in the Northern Antarctic Peninsula Endangers Genetic Diversity and Resilience to Climate Change

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