The Effect of Sand Particle Size on the Burrowing Ability of the Beach Mysid Gastrosaccus psammodytes Tattersall

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By this: publisher
In this Subject: Oceanography
By this author: Nel R. ;&nbsp; McLachlan A. ;&nbsp; Winter D.

Authors: Nel R.; McLachlan A.; Winter D.

Source: Estuarine, Coastal and Shelf Science, Volume 48, Number 5, May 1999 , pp. 599-604(6)

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Abstract:

Laboratory studies on the burrowing rates of the mysid shrimp, Gastrosaccus psammodytes , in a series of well-sorted sediments, determined whether (1) burial times were dependent on grain size and (2) if natural population distribution may be influenced by grain size on beaches. Burial times were tested in nine well-sorted sediments with grain size ranging from 90 to 2000m. Large individuals (i.e. gravid females) were used. G. psammodytes burrowed fastest in 125–1000m sand with mean burial times less than 1·6s. Burial time increased to approximately 2s in 90–125m sand. G. psammodytes could not burrow in grain sizes coarser than 1000m. G. psammodytes has been reported to occur on beaches with grain sizes ranging from 90 to 500m but are uncommon on beaches with coarser sand. It appears that population distribution may be influenced by grain size that is probably not related to the animals’ burial time ability, but rather their inability to burrow completely into coarse sand. Indirectly, grain size may also influence the morphodynamic state of a beach and therefore food availability since coarse-grained beaches tend to be reflective with little surf production. Copyright 1999 Academic Press