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Theses allocations may also be sex-specific considering differential energetic or nutritional requirements of males and females and\/or sexual segregation in foraging niches and\/or areas. In this study we investigated the foraging ecology of an Arctic, zooplanktivorous seabird, the little auk <jats:italic>Alle alle<\/jats:italic> during the pre-laying period using remote sensing of the environment and GPS-TDR loggers deployed on birds. We compared foraging trips range and habitats of birds with other stages of the\u00a0breeding period and between sexes.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>We found that little auks during the pre-laying period foraged exclusively in cold sea surface temperature zones (with temperatures\u2009&lt;\u20095 \u00baC) but in various sea depth zones. They dived to similar depths ranging from -4.0 to -10.9\u00a0m, exploring various thermal microhabitats (with mean temperatures values ranging from 2.2\u00a0\u00b0C in Shelf sea depth zone to 5.9\u00a0\u00b0C in Deep sea depth zone). The majority of foraging trips and dives characteristics were similar to subsequent phases of breeding. However, home ranges during the pre-laying trips were wider compared to the incubation period. As expected, females exhibited wider foraging niches compared to males (wider range of sea surface temperature and sea depth in foraging locations), which could be explained by sex specific energetic and\/or nutritional requirements (females producing an egg). We also delineated local foraging areas important for little auks during their whole breeding season. Protection of these areas is crucial for sustaining the local marine biodiversity.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>We found that little auks females during the pre-laying period explored wider foraging niches compared to males. These differences may be attributed to sex-specific nutritional or\/and energetical constraints at this stage of breeding. The results of this study also emphasize the importance of shelf Arctic-type water masses as the foraging areas for little auks during successive stages of breeding.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12983-024-00534-2","type":"journal-article","created":{"date-parts":[[2024,4,17]],"date-time":"2024-04-17T04:02:32Z","timestamp":1713326552000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Sex differences in foraging ecology of a zooplanktivorous little auk Alle alle during the pre-laying period: insights from remote sensing and animal-tracking"],"prefix":"10.1186","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1879-4342","authenticated-orcid":false,"given":"Dariusz","family":"Jakubas","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Katarzyna","family":"Wojczulanis-Jakubas","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lech Marek","family":"Iliszko","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,4,17]]},"reference":[{"key":"534_CR1","doi-asserted-by":"crossref","unstructured":"Stearns SC. 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