Depletion of benthic invertebrates by bar-tailed godwits Limosa lapponica in a subtropical estuary

Zharikov, Y. and Skilleter, G. A. (2003) Depletion of benthic invertebrates by bar-tailed godwits Limosa lapponica in a subtropical estuary. Marine Ecology-Progress Series, 254 151-162. doi:10.3354/meps254151


Author Zharikov, Y.
Skilleter, G. A.
Title Depletion of benthic invertebrates by bar-tailed godwits Limosa lapponica in a subtropical estuary
Journal name Marine Ecology-Progress Series   Check publisher's open access policy
ISSN 0171-8630
1616-1599
Publication date 2003-01-01
Sub-type Article (original research)
DOI 10.3354/meps254151
Open Access Status DOI
Volume 254
Start page 151
End page 162
Total pages 12
Place of publication Oldendorf, Germany
Publisher Inter-Research
Language eng
Abstract This study (1) investigated functional (capture rate, foraging success) and numerical (density) responses of bar-tailed godwits Limosa lapponica to an experimental decrease in densities of their prey, and (2) estimated seasonal depletion of the stock of their main prey, the mictyrid crab Mictyris longicarpus, in a subtropical estuary. It was predicted that if intake rates of the godwits are in the vicinity of the gradient section of a functional response curve, i.e. are directly determined by prey density, they will respond rapidly to experimental reduction in the density of their prey. Bar-tailed godwits did respond rapidly, both functionally and numerically, to a decrease in the density of M longicarpus, indicating that their intake rate was limited by food availability. The estimated seasonal depletion of the stocks of Mictyris by the godwits was 88 % of the initial standing stock. Despite the virtual disappearance of Mictyris from sediment samples through the course of a non-breeding season, local densities of godwits did not change between October and March, implying that adequate rates of intake could be maintained throughout their residence period.
Keyword Ecology
Marine & Freshwater Biology
Oceanography
Bar-tailed Godwit
Limosa Lapponica
Mictyris Longicarpus
Prey Density Manipulation
Prey Depletion
Subtropics
Oystercatchers Haematopus-ostralegus
Sandpipers Calidris-mauri
Lugworms Arenicola-marina
Intertidal Habitat Use
Tropical Tidal Flat
Wadden Sea
Shorebird Predation
Reproductive Success
Spatial Patterns
Prey Abundance
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 05:06:00 EST