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Full-Text Articles in Life Sciences
Evidence Of Intermittent Residency In The Northern Fur Seal (Callorhinus Ursinus)., Megan Foley
Evidence Of Intermittent Residency In The Northern Fur Seal (Callorhinus Ursinus)., Megan Foley
HCNSO Student Theses and Dissertations
This study found evidence of intermittent, multi-year residency periods in northern fur seals (Callorhinus ursinus) using stable isotope ratios in vibrissae and canine teeth. Northern fur seals migrate from the Bering Sea during summer months to lower latitudes and slightly warmer waters of the northeastern Pacific Ocean and California Current in the winter. To determine the length of time spent away from the Bering Sea, growth rate was estimated using the covarying oscillations δ13C and δ15N, estimated to be 0.09 mm/day. The δ13C and δ15N in vibrissae from 30 male …
A Comparison Of The Ichthyofaunal Trophic Ecology At Selected Limestone Artificial Reef Sites And Adjacent Natural Reef Sites, Joseph R. Hornbeck
A Comparison Of The Ichthyofaunal Trophic Ecology At Selected Limestone Artificial Reef Sites And Adjacent Natural Reef Sites, Joseph R. Hornbeck
HCNSO Student Theses and Dissertations
Artificial reefs may enhance the biological production of reef-associated flora and fauna, but their trophic structure relative to that of natural reefs remains understudied. We assessed trophic dynamics by comparing δ13C and δ15N in 43 fish species from artificial and natural reef tracts of Broward County, Florida. We tested the effect of sampling location (artificial, first, and second reef), general feeding strategy (herbivore, omnivore, planktivore, invertivore, and carnivore), phylogeny, and standard length. For all samples, δ13C and δ15N ranged from -19.5 to -13.1‰ and 6.7 to 13.3‰, respectively. Lower trophic level feeding …