[MARMAM] new paper on ringed seal diet in relation to environment

Magaly Chambellant mchambellant at hotmail.com
Fri Jun 21 00:07:49 PDT 2013


Good Day,

I am glad to announce the publication of a new paper on ringed diet in relation to environment:

Chambellant M, Stirling I, Ferguson SH
 (2013) Temporal variation in western Hudson Bay ringed seal Phoca hispida diet in relation to environment. Mar Ecol Prog Ser 481:269-287

ABSTRACT: We present the first study of ringed seal Phoca hispida
 feeding habits in western Hudson Bay (WHB) using stomach content 
analysis and stable isotope analysis (SIA). Ringed seals were sampled 
during 9 Inuit subsistence harvests in Arviat, Nunavut, Canada, over the
 period 1991 to 2006. During the open-water season in summer and fall, 
ringed seals fed mostly on sand lance Ammodytes spp. In the spring, when annual sea ice was still present, Arctic cod Boreogadus saida and capelin Mallotus villosus
 were also important in the diet, and consumption of invertebrates was 
higher than in the open-water period. From SIA, adult ringed seals 
exploited slightly more benthic habitats than immature individuals. Sand
 lances were the main prey consumed throughout the study period, but 
strong interannual variation occurred. When break-up of the sea ice in 
spring was relatively late, as in the early 1990s, ringed seal 
consumption of sand lance and total energy input was lower than in 
subsequent years of the study, despite a higher importance of sculpins 
(Cottidae) in the diet. The consumption of other fish species changed in
 the 2000s: Arctic cod declined whereas capelin increased in importance.
 Our results suggest that ringed seals in WHB are sand lance 
specialists, and their population dynamics are, at times, strongly 
regulated by bottom-up processes.

http://www.int-res.com/abstracts/meps/v481/p269-287/

Cheers,

Magaly 		 	   		  
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