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Effects of tidal cycles on shorebird distribution and foraging behaviour in a coastal tropical wetland: Insights for carrying capacity assessment

 

 
标题: Effects of tidal cycles on shorebird distribution and foraging behaviour in a coastal tropical wetland: Insights for carrying capacity assessment
作者: Fonseca, J (Fonseca, Juanita); Basso, E (Basso, Enzo); Serrano, D (Serrano, David); Navedo, JG (Navedo, Juan G.)
来源出版物: ESTUARINE COASTAL AND SHELF SCIENCE  卷: 198  页: 279-287  DOI: 10.1016/j.ecss.2017.09.016  子辑: A  出版年: NOV 5 2017  
摘要: Wetland loss has driven negative effects on biodiversity by a reduction in potential available habitats, directly impacting wetland-dependent species such as migratory shorebirds. At coastal areas where tidal cycles can restrict food access, the degree to which density of foraging birds is mediated by conspecific abundance or by the available areas is crucial to understanding patterns of bird distribution and wetland carrying capacity. We used the bathymetry of two sectors modeled with two numerical matrices to determine the availability of intertidal foraging areas in relation to tidal level (spring and neap tides), and this information was used to estimate shorebird density and foraging activity throughout the low-tide cycle in a tropical coastal lagoon in northwestern Mexico. Relative to spring tides, an 80% reduction in available foraging areas occurred during neap tides. Overall shorebird abundance was significantly reduced during neap tide periods, with differences between species. Densities of shorebirds increased during neap tides, particularly in one sector, and remained similar throughout the low-tide period (i.e. 4 h) either during spring or neap tides. Time spent foraging was consistently lower during neap-tides relative to spring-tides, especially for Long-billed curlew (44% reduction), Willet (37% reduction) and Black-necked stilt (29% reduction). These decreases in foraging activity when available habitats became reduced can hamper the opportunities of migratory shorebirds to reach their daily energy requirements to survive during the non-breeding season. This study shows that when intertidal habitats are severely reduced an important fraction of shorebird populations would probably be forced to find alternative areas to forage or increase foraging time during the night. Serving an essential function as top-predators, these results can have important implications on carrying capacity assessment for shorebirds at coastal wetlands. (C) 2017 Elsevier Ltd. All rights reserved.
入藏号: WOS:000415781000026
作者关键词: Tidal amplitude; Coastal wetlands; Carrying capacity; Shorebirds; Foraging activity; Time restrictions
KeyWords Plus: NORTH-AMERICAN SHOREBIRDS; ESTUARINE SEDIMENT FLATS; INTERFERENCE COMPETITION; FUNCTIONAL-RESPONSE; ECOSYSTEM SERVICES; CALIDRIS-ALPINA; LAND-USE; WADERS; WATERBIRDS; BIRDS
地址: [Fonseca, Juanita; Serrano, David] Univ Autonoma Sinaloa, Fac Ciencias Mar, Paseo Claussen S-N Colonia Los Pinos, Mazatlan 82000, Sinaloa, Mexico. 
[Basso, Enzo; Navedo, Juan G.] Univ Austral Chile, Fac Ciencias, Bird Ecol Lab, Inst Ciencias Marinas & Limnol, Campus Isl Teja, Valdivia 5090000, Chile. 
[Navedo, Juan G.] Univ Austral Chile, Estn Expt Quempillen, Chiloe, Ancud, Chile.
研究方向: Marine & Freshwater Biology; Oceanography

 

原文链接:Effects of tidal cycles on shorebird distribution and foraging behaviour in a coastal tropical wetland: Insights for carrying capacity assessment