Colonisation of Beach-Cast Macrophyte Wrack Patches by Talitrid Amphipods: A Primer |
| |
Authors: | Aimée J D Pelletier Dennis E Jelinski Malte Treplin Martin Zimmer |
| |
Institution: | 1.Centre for Biodiversity Research, Department of Zoology,University of British Columbia,Vancouver,Canada;2.School for Resource and Environmental Studies, Faculty of Management,Dalhousie University,Halifax,Canada;3.Laboratory for Landscape and Ecosystems Research, Department of Geography,University of Victoria,Victoria,Canada;4.Zoologisches Institut,Christian-Albrechts-Universit?t zu Kiel,Kiel,Germany;5.FB Organismische Biologie,Paris-Lodron-Universit?t,Salzburg,Austria |
| |
Abstract: | Sandy beaches are characterised by heterogeneously distributed food sources both in time and space. The major energy supply
is derived from marine subsidies in the form of beach-cast macrophyte wrack. Wrack patches are short-lived, and their position
on the beaches varies with tidal and seasonal cycles as well as weather conditions. Little is known about how sandy beach
inhabitants orient themselves towards, and colonise, wrack patches. In a series of field studies on islands off Vancouver
Island (British Columbia, Canada), colonisation patterns of wrack patches by beach fleas and sand hoppers (Amphipoda: Talitridae),
the most abundant macrofaunal detritivores, were studied. As indicated by colonisation of experimental patches of wrack and
wrack surrogates that were either visible or buried in the sand, beach fleas (Traskorchestia traskiana) rely on olfactory cues for locating freshly deposited wrack patches in their patchy and dynamic habitat. Dense colonisation
of freshly deposited algal wrack generally occurred within less than 1 h but depended upon the tidal height of wrack patches.
Beach flea density in freshly deposited wrack patches increased with increasing tidal height. By contrast, sand hoppers (Megalorchestia californiana) colonised freshly deposited wrack patches in densities that decreased with tidal height. Discussing these interspecific
differences, we provide a primer for future detailed studies on transport of matter along the marine–terrestrial gradient
of sand beaches. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|