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Full-Text Articles in Physical Sciences and Mathematics
Determining Environmental Drivers Of Fish Community Structure Along The Coast Of Maine, Adrian Jordaan
Determining Environmental Drivers Of Fish Community Structure Along The Coast Of Maine, Adrian Jordaan
Electronic Theses and Dissertations
The work presented here was conceived to determine whether structure in marine communities could be related to multiple scaled environmental parameters, as seen in lake and stream systems. Four datasets collected from 2001 to 2005 were used. The datasets ranged from local scale tidepool and estuarine surveys, to more regional intertidal/subtidal surveys and conclude using a coast-wide trawl survey. Initially, a bootstrap program for running principal component analysis (PCA) was developed and tested for utility with additional information from Pearson correlation coefficients. The bootstrap-PC A program was capable of determining confidence limits for correlations amongst species. The results from analysis …
Vascular Morphometry Of The Retina In Antarctic Fishes Is Dependent Upon The Level Of Hemoglobin In Circulation, Jody M. Wujcik
Vascular Morphometry Of The Retina In Antarctic Fishes Is Dependent Upon The Level Of Hemoglobin In Circulation, Jody M. Wujcik
Electronic Theses and Dissertations
Antarctic notothenioids express the circulating oxygen-binding protein hemoglobin (Hb) over a broad range of blood concentrations. White-blooded icefishes (Suborder: Notothenioidei, Family: Channichthyidae) are the only known adult vertebrates to lack Hb completely. In addition to its role in oxygen transport, Hb is the primary reactant in degradation of nitric oxide (NO). Thus, NO should be degraded at a slower rate in Hb-lacking icefishes than in Hb-expressing notothenioids, leading to higher steady-state levels of NO in the former group. Increased levels of NO should stimulate upregulation of angiogenesis, the growth and proliferation of new blood vessels from existing vasculature. Based upon …