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Modeling the odor-landscape resulting from the pumping behavior of bivalve clams in the presence of predators.

Authors
  • Alvarez, A1
  • 1 Department of Marine Ecology (MARE), Instituto Mediterraneo de Estudios Avanzados-IMEDEA (CSIC-UIB), C/ Miquel Marques 21, Esporlas 07190, Spain. Electronic address: [email protected] , (Spain)
Type
Published Article
Journal
Journal of Theoretical Biology
Publisher
Elsevier
Publication Date
May 18, 2018
Volume
453
Pages
40–47
Identifiers
DOI: 10.1016/j.jtbi.2018.05.019
PMID: 29782927
Source
Medline
Keywords
License
Unknown

Abstract

Motivated by experimental findings, a computational fluid dynamics (CFD) model was used to investigate whether the clam Mercenaria mercenaria may alter its cue downstream variability by an exhalant random pumping behavior. This behavior was hypothesized to occur in the presence of predator chemical signals in order to prevent successful tracking by the predator. Simulated downstream flow and mixing conditions derived from the random nature of the clam exhalant jet in a crossflow were analyzed by computing an intermittency factor, determining the field of finite-time Lyapunov exponents (FTLEs) and identifying the resulting Lagrangian coherent structures (LCSs). Numerical simulations illustrate that the effectiveness of a fluctuating exhalant jet to prevent downstream tracking by a crab, depends on the ratio of the exhalant jet to the crossflow. Specifically, the clam could effectively enhance the downstream dispersion to prevent tracking, but only in the range of parameters where LCSs are generated (jet-to-crossflow ratio ≥ 1). Then, the probability of detection is reduced with respect to the case of a less fluctuating exhalant jet.

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