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Full-Text Articles in Life Sciences
An Ecological Study Of Notoplana Acticola, A Polyclad Flatworm, In A Rocky Intertidal Habitat On The North Central California Coast, Alan Bradley Thum
An Ecological Study Of Notoplana Acticola, A Polyclad Flatworm, In A Rocky Intertidal Habitat On The North Central California Coast, Alan Bradley Thum
University of the Pacific Theses and Dissertations
The taxonomy of the polyclad flatworms is fairly well-known and some attention has been given to study of their physiology. Investigations of an ecological nature, however, are scarce; in fact, no ecological studies have been made on the Pacific Coast of North America. Else- where, Pearse and Wharton (1938) investigated the general ecology of Stylochus frontalis, associated with oysters on the coasts of Florida, and occasional notes have appeared, reporting on polyclads as predators on oysters and barnacles (Book, 1925: Wolke, 1954; Loosanoff, 1956: Skerman,1960)
Oxygen Uptake And Thyroid Activity During Amphibian Metamorphosis, Susan Ann Foster
Oxygen Uptake And Thyroid Activity During Amphibian Metamorphosis, Susan Ann Foster
University of the Pacific Theses and Dissertations
Oxygen consumption can most readily be related to wet weight. However, the weight of a tadpole increases so long as it is feeding, then decreases during final non-feeding stages. Oxygen uptake may also be related to dry weight, but dry weight increases significantly from early tadpole stages to adult (Funkhouser and Mills, in press). There is change in one factor at the same time the change in the the other factor is in the opposite direction. Total nitrogen content may be used as an index of the metabolizing tissue, but is subject to the same criticism as dry weight (Moore, …
Seasonal Gonadal Changes Of Adult Oviparous Oysters In Tomales Bay, Carl John Berg
Seasonal Gonadal Changes Of Adult Oviparous Oysters In Tomales Bay, Carl John Berg
University of the Pacific Theses and Dissertations
Two species of oviparous oysters, Crassostrea virginica (Gmelin, 1790), the Eastern oyster, and Crassostrea gigas (Thunbert, 1793), the Japanese oyster, were introduced into Tomales Bay, California, for commercial purposes. Because these oysters do not propagate in Tomales Bay, new shipments of adult oysters or oyster spat must be periodically sent from the east coast of the United States or from Japan. It is the purpose of this study to compare the seasonal gonadal changes which occur in the two species of adult oysters in Tomales Bay with one another, and to compare them with the seasonal gonadal changes which occur …