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Mathot KJ, Elner RW. Evidence for sexual partitioning of foraging mode in Western Sandpipers (Calidris mauri) during migration. CAN J ZOOL 2004. [DOI: 10.1139/z04-080] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Migrating Western Sandpipers, Calidris mauri (Cabanis, 1857), observed feeding at an intertidal stopover site on the Fraser River delta, British Columbia, shifted their foraging mode from surface-pecking to probing over a 3-week period in April and May. We tested possible mechanisms to account for the field observations. Using control and shorebird exclusion plots over a 3-month period bracketing the migration, we determined that neither seasonal nor shorebird-induced changes in the relative availability of epifaunal compared with infaunal prey accounted for the decline in the prevalence of epifaunal feeding behaviour. However, strong peaks in both epi- and in-faunal prey densities coincided with the migration period, suggesting that migratory timing may be linked with the productivity schedule of major stopover sites. Males, which precede females in the migration and have relatively shorter bills, were observed to engage in epifaunal feeding more frequently than females. Thus, while foraging behaviour of the Western Sandpiper at a population level appears "plastic", the feeding repertoire of individuals is more specialized and results in sexual partitioning of prey resources. The implications of our findings for differential distribution patterns over the nonbreeding range and sex-related differences in contaminant profiles are discussed.
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Effects of hypoxia and anoxia on meiofauna: A review with new data from the Gulf of Mexico. ACTA ACUST UNITED AC 2001. [DOI: 10.1029/ce058p0165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2023]
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Moodley L, Chen G, Heip C, Vincx M. Vertical distribution of meiofauna in sediments from contrasting sites in the adriatic sea: Clues to the role of abiotic versus biotic control. ACTA ACUST UNITED AC 2000. [DOI: 10.1080/00785326.2000.10409450] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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