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What biological factors contribute to variation in cross\u2010ecosystem movements, however, have rarely been examined.<\/jats:p><\/jats:list-item><jats:list-item><jats:p>Here, we investigated how ontogeny (body size), sex and individual\u2010level behaviour impacts intrapopulation variation in cross\u2010ecosystem foraging (i.e. between freshwater and marine systems), by the top\u2010predator<jats:italic>Alligator mississippiensis<\/jats:italic>.<\/jats:p><\/jats:list-item><jats:list-item><jats:p>Field surveys revealed<jats:italic>A.\u00a0mississippiensis<\/jats:italic>uses marine ecosystems regularly and are abundant in estuarine tidal creeks (from 0\u00b73 to 6\u00b73 individuals per km of creek,<jats:italic>n<\/jats:italic>\u00a0=\u00a045 surveys).<jats:italic>Alligator mississippiensis<\/jats:italic>captured in marine\/estuarine habitats were significantly larger than individuals captured in freshwater and intermediate habitats.<\/jats:p><\/jats:list-item><jats:list-item><jats:p>Stomach content analysis (SCA) showed that small juveniles consumed marine\/estuarine prey less frequently (6\u00b77% of individuals) than did large juveniles (57\u00b78%), subadult (73%), and adult (78%) size classes. Isotopic mixing model analysis (<jats:styled-content style=\"fixed-case\">SIAR<\/jats:styled-content>) also suggests substantial variation in use of marine\/estuarine prey resources with differences among and within size classes between sexes and individuals (range of median estimates for marine\/estuarine diet contribution\u00a0=\u00a00\u00b705\u20130\u00b776).<\/jats:p><\/jats:list-item><jats:list-item><jats:p>These results demonstrate the importance of intrapopulation characteristics (body size, sex and individual specialization) as key determinants of the strength of predator\u2010driven ecosystem connectivity resulting from cross\u2010ecosystem foraging behaviours. Understanding the factors, which contribute to variation in cross\u2010ecosystem foraging behaviours, will improve our predictive understanding of the effects of top\u2010predators on community structure and ecosystem function.<\/jats:p><\/jats:list-item><\/jats:list><\/jats:p>","DOI":"10.1111\/1365-2656.12306","type":"journal-article","created":{"date-parts":[[2014,10,18]],"date-time":"2014-10-18T12:44:20Z","timestamp":1413636260000},"page":"35-48","source":"Crossref","is-referenced-by-count":51,"title":["Size, sex and individual\u2010level behaviour drive intrapopulation variation in cross\u2010ecosystem foraging of a top\u2010predator"],"prefix":"10.1111","volume":"84","author":[{"given":"James C.","family":"Nifong","sequence":"first","affiliation":[{"name":"Department of Biology University of Florida Gainesville FL USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Craig A.","family":"Layman","sequence":"additional","affiliation":[{"name":"Department of Applied Ecology North Carolina State University Chapel Hill NC USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brian R.","family":"Silliman","sequence":"additional","affiliation":[{"name":"Division of Marine Sciences and Conservation Nicholas School of the Environment Duke University Beaufort NC USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2014,11,24]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1461-0248.2001.00226.x"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1098\/rspb.2010.0232"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1461-0248.2011.01662.x"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2656.2009.01546.x"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.0030-1299.2005.13728.x"},{"key":"e_1_2_8_7_1","volume-title":"Ecology of Maritime Forests of the Southern Atlantic Coast: A Community Profile","author":"Bellis V.","year":"1995"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.tree.2010.06.012"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1139\/f95-159"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1086\/393620"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1098\/rspb.2010.0018"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1086\/343878"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.0703743104"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.tree.2011.01.009"},{"key":"e_1_2_8_15_1","unstructured":"Brittain R.A.(2009)Trophic Status Habitat Use and Climate Change Impacts on Avian Species of Coastal Georgia. 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