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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 11 to 20 of 4569 (0.036 seconds)Spelling suggestions: "subject:"zoology"" "subject:"eoology""
| 11 |
The effects of daily fluctuating temperatures and dimethylnaphthalene contaminated food on the estuarine grass shrimp, palaemonetes pugioDillon, Thomas Mitchell 01 January 1981 (has links)
The physiological effects of a natural perturbation (fluctuating. temperatures) and a petroleum-induced perturbation. (dimethylnaphthalene-contaminated food) on the grass shrimp. Palaemonetes pugio were compared. The resistance of shrimp to. environmental challenge, oxygen consumption rates (Vo(,2)) and(' ). several physiological indices of stress were determined after a 32. day exposure to fluctuating temperatures (FT) (18-22�C) and/or dimethylnaphthalene (DMN)-contaminated food (0.24 (mu)g DMN/g wet wt) and again after a 16 day recovery period of stable temperatures (20�C) and uncontaminated food. Both FT and DMN-contaminated food reduced survival to the challenge of hypoxia + reduced salinity. FT were quantitatively more stressful than either stable temperatures or DMN-contaminated food. After the recovery period, FT did not affect survival to hypoxia, while shrimp, which had ingested DMN-contaminated food, exhibited enhanced survival to hypoxia. Ingestion of DMN-contaminated food for 32 days resulted in elevated Vo(,2)(' )in shrimp exposed to declining oxygen concentrations. After the 32 day exposure period, FT had no significant effect on(' )Vo(,2) at 15�C, 20�C and 25�C, tissue Vo(,2),(' )Vo(,2) in declining oxygen and hemolymph copper concentrations. After the 16 day recovery period, shrimp from the FT regime exhibited depressed(' )Vo(,2) when exposed to 25�C but not to 15�C. These depressed respiratory rates were offset by the stimulatory effect of DMN-contaminated food. The ratio of oxygen consumed to nitrogen excreted wwas elevated after the exposure and recovery periods in shrimp exposed to both FT and DMN-contaminated food at the same time. Water flux rates were elevated by FT after the exposure and recovery periods but not when DMN-contaminated food was also ingested. Both water flux rates and the ratio of oxygen consumed to nitrogen excreted were elevated in all shrimp after the recovery period relative to levels observed after the exposure period. After the exposure period, FT induced elevated hemolymph acid phosphatase activities in shrimp exposed to hypoxia. After the recovery period, hypoxia induced elevated hemolymph acid phosphatase activities in shrimp which had ingested nothing but uncontaminated food relative to those ingesting DMN-contaminated food.
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| 12 |
Shell-less opisthobranchs of Virginia and MarylandVogel, Rosalie M. 01 January 1978 (has links)
No description available.
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| 13 |
Age and Growth of Juvenile Loggerheads (Caretta caretta), from Chesapeake BayKlinger, Ruth Ellen 01 January 1988 (has links)
No description available.
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| 14 |
The Early Life Histories of Three Families of Cephalopods (Order Teuthoidea) and an Examination of the Concept of a ParalarvaShea, Elizabeth Keane 01 January 1995 (has links)
No description available.
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| 15 |
Reproductive Biology of Tautog, Tautoga onitis, in the Lower Chesapeake Bay and Coastal Waters of VirginiaWhite, Geoffrey Gordon 01 January 1996 (has links)
No description available.
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| 16 |
Development of Podocysts of the Scyphozoan, Chrysaora quinquecirrha, after Removal of the Cyst CoveringTseng, Lan-Ping Amy 01 January 1974 (has links)
No description available.
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| 17 |
Nest site selection and foraging behavior of the bald eagle (Haliaeetus leucocephalus) in VirginiaJaffee, Norman Bernard 01 January 1980 (has links)
No description available.
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| 18 |
An activity budget analysis and habitat partitioning in the eastern fence lizard, Sceloporus undulatusRoss, Mary Angela 01 January 1982 (has links)
No description available.
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| 19 |
Reproduction in Three Species of Lizards from Dominica, West IndiesSomma, Carolynn Ann 01 January 1970 (has links)
No description available.
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| 20 |
Aspects of Breeding Behavior of the Royal Tern (Sterna maxima) with Particular Emphasis on Prey Size SelectivityIhle, William James 01 January 1984 (has links)
No description available.
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