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Experimental Analysis of Structural versus Trophic Importance of Seagrass Beds. I. Effects of Macrofaunal and Meiofaunal Invertebrates

journal contribution
posted on 2023-05-16, 11:41 authored by Graham EdgarGraham Edgar
Manipulative experiments using patches of artificial seagrass were set up at two temperature Australian locations in order to identify whether invertebrates were principally attracted to the structural features of seagrass habitats or to high levels of associated food production. Faunal responses to different treatments were largely consistent at the two sites. Number of species, abundance, biomass and productivity of invertebrates were all overwhelmingly influenced by the addition of surface debris to treatments, whereas the presence of artificial seagrass leaves produced little response. Total invertebrate numbers were negatively affected by the presence of buried seagrass material, and nematodes were negatively affected by reduction in quantity of fine organic particles amongst sediment. Invertebrate communities were therefore inferred to be primarily structured by food availability, particularly food in the form of seagrass debris for epifauna and fine organic particles for infaunal nematodes, and to show little direct dependence on structural characteristics of seagrass beds.

History

Publication title

Vie et Milieu

Volume

49

Issue

4

Pagination

239-248

ISSN

0240-8759

Department/School

Institute for Marine and Antarctic Studies

Publisher

Universite de Paris VI; Laboratoire-Arago

Place of publication

France

Repository Status

  • Restricted

Socio-economic Objectives

Marine biodiversity

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