Vertical Distribution and Migration of Decapod Larvae in Relation to Light and Tides in Willapa Bay,Washington |
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Authors: | Joanne K Breckenridge Stephen M Bollens |
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Institution: | (1) School of Biological Sciences, Washington State University, 14204 NE Salmon Creek Ave, Vancouver, WA 98686, USA;(2) School of Earth and Environmental Sciences, Washington State University, 14204 NE Salmon Creek Ave, Vancouver, WA 98686, USA |
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Abstract: | We investigated the occurrence of behaviors that maximize predator avoidance and seaward transport in estuarine decapod zoeae
by collecting larvae from discrete depths in a partially mixed estuary, Willapa Bay, Washington, USA, and relating their abundance
and vertical distribution to a suite of environmental variables. Abundances of first zoeae of Neotrypaea californiensis and Pinnotheridae were associated with tidal phase, diel phase, and water height. Both taxa were most abundant during ebb
tides, and abundances increased with water height, suggesting behaviors that enhanced seaward transport. Additionally, N. californiensis were both shallower and more abundant at night, indicative of behaviors to avoid visual predators. Our results suggest that
both tidal transport and predator avoidance are important and sometimes interactive selective forces shaping larval decapod
behavior. |
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