Behavioral Basis of Depth Regulation in the First Zoeal Stage of the Pacific Shore Crab, Hemigrapsus oregonensis (Brachyura: Grapsidae)
Date
1993-07
Authors
Contributor
Advisor
Department
Instructor
Depositor
Speaker
Researcher
Consultant
Interviewer
Narrator
Transcriber
Annotator
Journal Title
Journal ISSN
Volume Title
Publisher
University of Hawaii Press
Volume
Number/Issue
Starting Page
Ending Page
Alternative Title
Abstract
The behavioral basis of depth regulation is determined for the first
pelagic larval stage of the shore crab Hemigrapsus oregonensis Dana. Larvae are
negatively buoyant, passively sinking at 0.79 em/sec in 25 parts per thousand
(ppt) salinity (S) seawater and at 0.67 em/sec in 30 ppt S. At 30 ppt S, larvae
are negatively geotactic and move upward. At 25 ppt S, larvae remain negatively
geotactic, but a low level of locomotor activity results in net downward movement.
Swimming speed is higher at 30 ppt S than at 25 ppt S; however, there is no
response to incremental increases in hydrostatic pressure up to 0.8 atm at either
salinity. Behavioral responses should promote upward migration of the hatching
stage similar to the case with other intertidal crab species; however, low precision
in depth regulation contrasts with results from other species.
Description
Keywords
Citation
Arana M, Sulkin S. 1993. Behavioral basis of depth regulation in the first zoeal stage of the Pacific shore crab, Hemigrapsus oregonensis (Brachyura: Grapsidae). Pac Sci 47(3): 256-262.
Extent
Format
Geographic Location
Time Period
Related To
Related To (URI)
Table of Contents
Rights
Rights Holder
Local Contexts
Collections
Email libraryada-l@lists.hawaii.edu if you need this content in ADA-compliant format.