Moving northward: comparison of the foraging effort of Magellanic penguins from three colonies of northern Patagonia

Gómez‐Laich, Agustina; Wilson, Rory P.; Sala, Juan Emilio; Luzenti, Agustín; Quintana, Flavio

doi:10.1007/s00227-015-2681-1

Cited by 11 publications

(10 citation statements)

References 55 publications

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“…A recent northward expansion of the population of Magellanic penguins has been noted in Argentinean Patagonia, with new colonies being established and rapidly increasing (Gómez-Laich et al . 2015; Pozzi et al . 2015).…”

Section: Discussionmentioning

confidence: 99%

“…This northward distributional shift of the Magellanic penguin, which is possibly linked to a decreased prey availability in the central Argentinean coast (Gómez-Laich et al . 2015; Pozzi et al . 2015), could lead the species to breed in areas that are suitable for mosquitoes and other vectors.…”

Section: Discussionmentioning

confidence: 99%

“…Even if future studies conclude that blood parasites are absent in wild Magellanic penguins throughout the species' distribution, there is evidence to indicate this could change in the future. A recent northward expansion of the population of Magellanic penguins has been noted in Argentinean Patagonia, with new colonies being established and rapidly increasing (Gómez-Laich et al 2015;Pozzi et al 2015 On the other hand, recent studies indicate a poleward extension of the distribution of dipteran insects, and there is evidence of a distribution shift of mosquito-borne pathogens in response to climate change (Rogers and Randolph, 2000;Harvell et al 2002;Garamszegi, 2011). In this scenario, the clash between the northward expansion of Magellanic penguins and the southward expansion of mosquitoes could provide novel opportunities for the transmission of blood parasites on the northern Argentinean Patagonian coast, with potentially grave consequences for this species' conservation.…”

Section: Perspectives For Climate Change and Distribution Shiftsmentioning

confidence: 99%

“…Laich et al 2015;Pozzi et al 2015), could lead the species to breed in areas that are suitable for mosquitoes and other vectors.…”

mentioning

confidence: 99%

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Do blood parasites infect Magellanic penguins (Spheniscus magellanicus) in the wild? Prospective investigation and climatogeographic considerations

et al. 2017

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Magellanic penguins (Spheniscus magellanicus) are native to Argentina, Chile and the Falkland Islands. Magellanic penguins are highly susceptible to blood parasites such as the mosquito-borne Plasmodium spp., which have been documented causing high morbidity and mortality in zoos and rehabilitation centres. However, to date no blood parasites have been detected in wild Magellanic penguins, and it is not clear whether this is reflective of their true absence or is instead related to an insufficiency in sampling effort or a failure of the diagnostic methods. We examined blood smears of 284 Magellanic penguins from the Argentinean coast and tested their blood samples with nested polymerase chain reaction tests targeting Haemoproteus, Plasmodium, Leucocytozoon and Babesia. No blood parasites were detected. Analysing the sampling effort of previous studies and the climatogeography of the region, we found there is strong basis to conclude that haemosporidians do not infect wild Magellanic penguins on the Argentinean coast. However, at present it is not possible to determine whether such parasites occur on the Chilean coast and at the Falkland Islands. Furthermore, it is troubling that the northward distribution expansion of Magellanic penguins and the poleward distribution shift of vectors may lead to novel opportunities for the transmission of blood parasites.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Perspectives For Climate Change and Distribution Shiftsmentioning

confidence: 99%

“…Laich et al 2015;Pozzi et al 2015), could lead the species to breed in areas that are suitable for mosquitoes and other vectors.…”

mentioning

confidence: 99%

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Do blood parasites infect Magellanic penguins (Spheniscus magellanicus) in the wild? Prospective investigation and climatogeographic considerations

et al. 2017

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“…However, recent research indicate that even closely situated colonies that are well within each other’s foraging range also segregate spatially. Such segregation occurs in, for example, Adélie penguins ( Pygoscelis adeliae ) [26, 27], Northern fur seals ( Callorhinus ursinus ) [28, 29], Macaroni penguins ( Eudyptes chrysolophus ) [30], and Magellanic penguins ( Spheniscus magellanicus ) [31]. Current hypotheses suggest that this small-scale spatial segregation is driven by competitive exclusion, which is then further enhanced by private information (i.e.…”

Section: Introductionmentioning

confidence: 99%

Preferred, small-scale foraging areas of two Southern Ocean fur seal species are not determined by habitat characteristics

et al. 2019

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Background To understand and predict the distribution of foragers, it is crucial to identify the factors that affect individual movement decisions at different scales. Individuals are expected to adjust their foraging movements to the hierarchical spatial distribution of resources. At a small local scale, spatial segregation in foraging habitat happens among individuals of closely situated colonies. If foraging segregation is due to differences in distribution of resources, we would expect segregated foraging areas to have divergent habitat characteristics. Results We investigated how environmental characteristics of preferred foraging areas differ between two closely situated Subantarctic fur seal (Arctocephalus tropicalis) colonies and a single Antarctic fur seal (A. gazella) colony that forage in different pelagic areas even though they are located well within each other’s foraging range. We further investigated the influence of the seasonal cycle on those environmental factors. This study used tracking data from 121 adult female Subantarctic and Antarctic fur seals, collected during summer and winter (2009–2015), from three different colonies. Boosted Regression Tree species distribution models were used to determine key environmental variables associated with areas of fur seal restricted search behaviour. There were no differences in the relative influence of key environmental variables between colonies and seasons. The variables with the most influence for each colony and season were latitude, longitude and magnitude of sea-currents. The influence of latitude and longitude is a by-product of the species’ distinct foraging areas, despite the close proximity (< 25 km) of the colonies. The predicted potential foraging areas for each colony changed from summer to winter, reflecting the seasonal cycle of the Southern Ocean. The model predicted that the potential foraging areas of females from the three colonies should overlap, and the fact they do not in reality indicates that factors other than environmental are influencing the location of each colony’s foraging area. Conclusions The results indicated that small scale spatial segregation of foraging habitats is not driven by bottom-up processes. It is therefore important to also consider other potential drivers, e.g. competition, information transfer, and memory, to understand animal foraging decisions and movements.

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At-sea distribution, movements and diving behavior of Magellanic penguins reflect small-scale changes in oceanographic conditions around the colony

et al. 2022

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Moving northward: comparison of the foraging effort of Magellanic penguins from three colonies of northern Patagonia

Cited by 11 publications

References 55 publications

Do blood parasites infect Magellanic penguins (Spheniscus magellanicus) in the wild? Prospective investigation and climatogeographic considerations

Do blood parasites infect Magellanic penguins (Spheniscus magellanicus) in the wild? Prospective investigation and climatogeographic considerations

Preferred, small-scale foraging areas of two Southern Ocean fur seal species are not determined by habitat characteristics

At-sea distribution, movements and diving behavior of Magellanic penguins reflect small-scale changes in oceanographic conditions around the colony

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