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In Situ Behavioral Response of Common Loons Associated with Elevated Mercury (Hg) Exposure Ecology and Society
Nocera, Joseph J; Acadia University; 023758n@acadiau.ca; Taylor, Philip D; Acadia University; ptaylor@resalliance.org.
Common Loons (Gavia immer) in Nova Scotia, Canada have the highest blood mercury (Hg) concentrations of any loon population in North America. Previous studies have shown that exposure to varying levels of Hg in prey is associated with changes in pre-nesting adult behavior. We report here the first association of sublethal blood Hg contamination with changes in behavior of Common Loon young. As Hg levels in their blood rise, the amount of time that chicks spend brooding (by back-riding) decreases (P = 0.004) and time spent preening increases (P = 0.003). The sum increase in energy expenditure is not being compensated for with expected increases in feeding rates or begging. We suggest that such altered time-activity budgets may disrupt the energetic balance...
Tipo: Peer-Reviewed Reports Palavras-chave: Behavioral toxicology; Common loon behavior; Gavia immer; Kejimkujik National Park; Nova Scotia; Canada; Mercury; Neurotoxicity; Southwestern New Brunswick; Sub-lethal exposure; Time-activity budgets..
Ano: 1998
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Prospection et peche de la crevette profonde Pandalus borealis au large des cotes de Terre-Neuve et de Nouvelle-Ecosse. ArchiMer
Fontaine, Bernard; L'Herrou, Roger; Decamps, Philippe; Paturel, Bernard.
To assess the potential fishery for Pandalus borealis, the R/V `CRYOS' made cruises, in 1970 off SW Newfoundland and in 1971 off Nova Scotia. The trenches where Pandalus is found and the 3 types of trawl (large mouth, balloon and flat) are described. Details of size of catches and of individuals, and also of fish species caught are given. Prawn stocks in these grounds seem to match those of grounds already being exploited. Significant fish catches may also be expected (e.g. skate, herring and cod). Canadian type trawlers of ~ 65 ft would be suitable to exploit this fishery.
Tipo: Text Palavras-chave: Fishery; Nova Scotia; Pandalus borealis; Prawn.
Ano: 1972 URL: http://archimer.ifremer.fr/doc/1972/publication-2055.pdf
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