Harlequin Ducks (<i>Histrionicus histrionicus</i>) Scavenge Sea Urchin Fragments from Foraging Sea Otters (<i>Enhydra lutris</i>)
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چکیده
منابع مشابه
PCB exposure in sea otters and harlequin ducks in relation to history of contamination by the Exxon Valdez oil spill.
Exposure to contaminants other than petroleum hydrocarbons could confound interpretation of Exxon Valdez oil spill effects on biota at Prince William Sound, Alaska. Hence, we investigated polychlorinated biphenyls (PCBs) in blood of sea otters and harlequin ducks sampled during 1998. PCB concentrations characterized by lower chlorinated congeners were highest in sea otters from the unoiled area...
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Ecological risk assessments need to advance beyond evaluating risks to individuals that are largely based on toxicity studies conducted on a few species under laboratory conditions, to assessing population-level risks to the environment, including considerations of variability and uncertainty. Two individual-based models (IBMs), recently developed to assess current risks to sea otters and seadu...
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Both live and reactivated sea urchin sperm flagella were broken by passage through a pipette. Distal fragments stopped, but basal fragments continued to beat. Intact flagella were about 48 micrometer long; basal fragments were about 4-20 micrometer long. Beat periods of tritonated fragments were 11% shorter than those of unbroken controls, possibly reflecting decreased viscous loading; beat per...
متن کاملWhat's killing the sea otters.
Los Angeles They're cute, furry, and when they're not chasing each other around kelp forests, they're floating on their backs like miniature teddy bears. Hunted nearly to extinction for their luxuriant fur--the thickest of any mammal's--the sea otters of California were making a comeback until they started mysteriously dying off. State wildlife officials recovered a record 281 dead otters last ...
متن کاملSea urchin feeding fronts
Sea urchin feeding fronts are a striking example of spatial pattern formation in an ecological system. If it is assumed that urchins are asocial, and that they move randomly, then the formation of these dense fronts is an apparent paradox. The key lies in observations that urchins move further in areas where their algal food is less plentiful. This naturally leads to the accumulation of urchins...
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ژورنال
عنوان ژورنال: The Canadian Field-Naturalist
سال: 2016
ISSN: 0008-3550
DOI: 10.22621/cfn.v130i2.1832