Graduate Thesis Or Dissertation
 

The effects of PCB exposure on the behavior of the shore crab Hemigrapsus oregonensis

Pubblico Deposited

Contenuto scaricabile

Scarica il pdf
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/1z40kx325

Descriptions

Attribute NameValues
Creator
Abstract
  • The behavior of the shore crab Hemigrapsus oregonensis was assessed with and without exposure to polychlorinated biphenyls (Aroclor 1260). After describing the crab's behavioral repertoire, activity budgets were developed from observations of the time crabs spent in 20 categories of shelter use, posture, and activity while held in habitat replicas with sinusoidal tides of 12.4 hours. Without PCBs exposure female crabs spent more time sheltered and feeding but less time displaying than males. The sexes also differed in the kinds of displays given. For both sexes certain activities prevailed at certain tidal stages. Crabs readily accumulated PCBs from contaminated sand. Whole body burdens reached as high as 190 ppm PCBs and were related to sex and time spent in feeding. In two experiments the primary effect of PCBs exposure upon the activity budgets of both sexes was to decrease the time spent in pre-feeding and feeding behaviors. When given a variety of food types in a third experiment, crabs under exposure shifted from feeding upon PCBs-contaminated sand to uncontaminated food. By changing its feeding behavior Hemigrapsus oregonensis actively reduced the received dose of PCBs and its presumed adverse effects from what they would otherwise have been.
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Academic Affiliation
Non-Academic Affiliation
Subject
Dichiarazione dei diritti
Publisher
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome, 8-bit Grayscale) using ScandAll PRO 1.8.1 on a Fi-6770A in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces

Le relazioni

Parents:

This work has no parents.

In Collection:

Elementi

Thumbnail Titolo Data caricata Visibilità Azioni
file details PearsonWalterH1977.pdf 2017-08-19 Pubblico Scaricare