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Seasonal ch.nges on two different spatial scales： response of aquatic invertebrates to water body and microh.bitat

Insect Science 2005年第4期12卷 263-280页

作者： WILCO C.E.P. VERBERK hein h. van kleef MARTIJN DIJKMAN PAUL van h.EK PETER SPIERENBURG h.NS ESSELINK Bargerveen Foundation Radboud University Nijmegen Department of Environmental Studies Institute for Wetland and Water Research Radboud University Nijmegen Department of Animal Ecology and Ecoph.siology Radboud University NijmegenNijmegen the Netherlands

Knowledge about th. spatial and temporal scales of both.h.bitat use and th. functional significance of different adaptations is essential for an understanding of th. population dynamics of invertebrate assemblages. Th.s fundamental knowledge is not only interesting from an academic point of view, but is sorely lacking and needed in th. field of restoration ecology. Many species are th.eatened due to degradation. Knowing wh.t environmental conditions are needed dtLring th. life cycle of th.se species is important in th. design of restoration measures wh.ch.aim to lift existing bottlenecks for th.eatened species. To assess th. relative importance of water type and microh.bitat in structuring th. invertebrate assemblage during different seasons, invertebrates were sampled in th.ee water bodies differing in troph.c level and acidity. Different parts with.n a water body （microh.bitats） were sampled separately and each.water body was sampled in all four seasons. Results sh.w th.t water body is an important factor structuring th. invertebrate assemblage early in th. season, wh.reas microh.bitat became more important later in th. season. Structural complexity of microh.bitats was related to th. type of locomotion employed by invertebrates. Seasonal differences could be related to population dynamics （reproduction, mortality）. Moreover, fluctuations in resource availability were expected to differ between th. water bodies, with.h.gh.st fluctuations in th. eutroph.c water body and with.fluctuations becoming less predictable later in th. season. Th.s was confirmed by th. data： species synch.onization to pulses in food availability was strongest in th. eutroph.c water body. Moreover, synch.onization was strongest in summer, wh.le in autumn waters were invaded by dispersive species. Based on th.se results a synth.sis is presented on th. functioning of th. different waters during th. different seasons.

关键词： dispersal fluctuations in resource availability food substrate synch.onization

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