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5 results for “Fratercula arctica”
Data from: Stay or go? Changing breeding conditions affect sexual difference in colony attendance strategies of Atlantic puffins Fratercula arctica
<p>Male and female birds have different interests in reproductive investment, which in turn may increase negative effects of poorer breeding conditions caused by e.g., climate change or ecosystem regime shifts. Using a 33-year time series with resightings of Atlantic puffins <em>Fratercula arctica</em> individually colour-ringed as breeders in previous years, we show that the difference in colony attendance of male and female birds depends on the environmental conditions for raising young, proxied by the average duration of the chick period and size of the herring <em>Clupea harengus </em>fed to the chicks in the colony each year. The longer the chick period, and thus the birds' overall investment in reproduction, the more was the sex ratio of adults sitting out on the colony surface biased in favour of males. An increase in herring size, indicating better feeding conditions for raising chicks, led to more observations of both sexes, and the increase was slightly more prominent for females than males. We discuss the results in relation to general life-history theory on sexual differences in trade-offs between individual investment in breeding and own survival. Our results suggest that females are increasingly more willing than males to invest in provisioning for the chick the longer the chick needs such care. This difference may also prove valuable as an indication of breeding conditions from only a short visit to a colony with colour-ringed birds of known sex.</p>
Fig. 3 in Fatal avian malaria in captive Atlantic puffins (Fratercula arctica) in Switzerland
Fig. 3. Modified Wright-stained peripheral blood smear of a captive Atlantic puffin (case 5). Intra-erythrocytic stages of Plasmodium relictum: trophozoites (short arrows); mature meront (long arrow) with marked displacement of the erythrocyte's nucleus; pigment granules (arrowheads). Picture: Veterinary Laboratory, Vetsuisse Faculty, University of Zurich.
Fig. 1. H&E in Fatal avian malaria in captive Atlantic puffins (Fratercula arctica) in Switzerland
Fig. 1. H&E-stained histological sections of the liver (A, B, C) and the spleen (D) of captive Atlantic puffins at 400x magnification. A: Case 1, multiple protozoan Plasmodium schizonts of up to 20 μm in diameter (arrows). B: Case 2, periportal infiltration with lymphocytes and presence of multiple intracytoplasmic Plasmodium schizonts, which contain numerous merozoites (arrows). C: Case 3, Plasmodium merozoites within the liver parenchyma (arrow). D: Case 5, multiple histiocytes with intracytoplasmic brown, finely granular pigment (accumulation of iron-based pigment). (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)
Fig. 2. H&E in Fatal avian malaria in captive Atlantic puffins (Fratercula arctica) in Switzerland
Fig. 2. H&E-stained histological sections of the liver (A, B, D) and the spleen (C) of captive Atlantic puffins at 1000x magnification, showing Plasmodium schizonts of up to 15 μm in diameter, containing multiple merozoites of 1–2 μm (arrows): A: Case 2, B: Case 4, C: Case 6, D: Case 7.
Data from: Stay or go? Changing breeding conditions affect sexual difference in colony attendance strategies of Atlantic puffins Fratercula arctica
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