Graduate Thesis Or Dissertation
 

Acute effects of sedimentation on Cumella vulgaris hart 1930 (cumacea)

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  • The ability of Cumella vulgaris to avoid burial under different rates of sedimentation and to recover from burial once buried was studied. Sedimentation rates higher than 0. 25 cm/mm are necessary to bury 50% of C. vulgaris with the deposition of 4 cm of sediment. Cumella vulgaris can swim several times faster than the sedimentation rates at which fine sand successfully buried it. Immatures and females swam at speeds of 0.25-1.5 cm/sec; males swam at speeds up to 5 cm/sec. Sinking speeds of live C. vulgaris were proportional to size and varied from 0.2-1.6 cm/sec. Cumella vulgaris should be able to avoid burial by dredging caused sedimentation. Dredging's most important impact on this species would most likely be long term changes in a bay which might reduce its habitat. Dead C. vulgaris were buried in their habitat in winter. Four days later one-half were successfully recovered by coring. When doing field studies of the acute effects of dredging on a habitat one needs to be aware that victims of burial may be recoverable for several days after death and may need to be distinguished from living animals.
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Déclaration de droits
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