Penguindex: a Living Planet Index for Pygoscelis species penguins identifies key eras of population change

Talis, Emma J.; Che‐Castaldo, Christian; Hart, Tom; McRae, Louise; Lynch, Heather J.

doi:10.1007/s00300-023-03148-2

Cited by 3 publications

(2 citation statements)

References 56 publications

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“…We determined the total number of penguins adjacent to these persistent ocean features using a Bayesian population dynamics model 85 , which allows us to integrate all available census data to predict the current number of breeding penguins at each location (Tables 1 , 2 ; Fig. 1 ).…”

Section: Resultsmentioning

confidence: 99%

Quantifying Antarctic krill connectivity across the West Antarctic Peninsula and its role in large-scale Pygoscelis penguin population dynamics

Gallagher¹,

Dinniman²,

Lynch³

2023

Sci Rep

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Antarctic krill (Euphausia superba) are considered a keystone species for higher trophic level predators along the West Antarctic Peninsula (WAP) during the austral summer. The connectivity of krill may play a critical role in predator biogeography, especially for central-place foragers such as the Pygoscelis spp. penguins that breed along the WAP during the austral summer. Antarctic krill are also heavily fished commercially; therefore, understanding population connectivity of krill is critical to effective management. Here, we used a physical ocean model to examine adult krill connectivity in this region using simulated krill with realistic diel vertical migration behaviors across four austral summers. Our results indicate that krill north and south of Low Island and the southern Bransfield Strait are nearly isolated from each other and that persistent current features play a role in this lack of inter-region connectivity. Transit and entrainment times were not correlated with penguin populations at the large spatial scales examined. However, long transit times and reduced entrainment correlate spatially with the areas where krill fishing is most intense, which heightens the risk that krill fishing may lead to limited krill availability for predators.

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Section: Resultsmentioning

confidence: 99%

Quantifying Antarctic krill connectivity across the West Antarctic Peninsula and its role in large-scale Pygoscelis penguin population dynamics

Gallagher¹,

Dinniman²,

Lynch³

2023

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…Gentoo penguins are known for greater flexibility in diet composition which comprise a mix of Antarctic krill and fish, and foraging behaviour; in addition, occupy regions characterized by reduced ice-cover. Gentoo breeding colonies below 60 • S have experienced a rapid growth over the last 40 years in contrast to the decline of Chinstrap and the little change on average of Adelie Penguin colonies (Talis et al, 2023;Wethington et al, 2023). Gentoo penguin population grown can be attributed largely to increases on the Antarctic Peninsula, which has experienced warming air temperatures, increasing precipitation and declines in the extent, seasonal duration, and thickness of sea ice.…”

Section: Equilibrium Analysismentioning

confidence: 99%