Feedbacks between bivalve density, flow, and suspended sediment concentration on patch stable states.

Abstract:

:We explore the role of biophysical feedbacks occurring at the patch scale (spatial scale of tens of meters) that influence bivalve physiological condition and affect patch stability by developing a numerical model for the pinnid bivalve, Atrina zelandica, in cohesive sediments. Simulated feedbacks involve bivalve density, flow conditions (assumed to be primarily influenced by local water depth and peak current speed), suspended sediment concentration (evaluated through a balance between background concentration, deposition, and erosion), and changes in the physiology of Atrina derived from empirical study. The model demonstrates that high bivalve density can lead to skimming flow and to a concomitant decrease in resuspension that will affect suspended sediment concentration over the patch directly feeding back on bivalve physiology. Consequently, for a given flow and background suspended sediment load, the stability of a patch directly depends on the size and density of bivalves in the patch. Although under a range of conditions patch stability is ensured independently of bivalve density, simulations clearly indicate that sudden changes in bivalve density or suspended sediment concentration can substantially affect patch structure and lead to different stable states. The model highlights the role of interactions between organisms, flow, and broader scale environmental conditions in providing a mechanistic explanation for the patchy occurrence of benthic suspension feeders.

journal_name

Ecology

journal_title

Ecology

authors

Coco G,Thrush SF,Green MO,Hewitt JE

doi

10.1890/0012-9658(2006)87[2862:fbbdfa]2.0.co;2

subject

Has Abstract

pub_date

2006-11-01 00:00:00

pages

2862-70

issue

11

eissn

0012-9658

issn

1939-9170

journal_volume

87

pub_type

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