期刊
MARINE ECOLOGY PROGRESS SERIES
卷 512, 期 -, 页码 9-21出版社
INTER-RESEARCH
DOI: 10.3354/meps10948
关键词
Food web; Stable isotope; Upwelling system; South-eastern Brazil
资金
- National Council for Scientific and Technological Development (CNPq) (PRONEX) [368/96]
- FAPESP, State of Sao Paulo Research Foundation [06/5697-4, 06/57008-0]
To determine whether shifts occurred in the food web associated with upwelling at the Brazilian western boundary South Atlantic Central Water (SACW), we measured isotopic composition (delta N-15 and delta C-13) of 38 fish and 3 squid species from the Cabo Frio food web. Sampling was performed during the austral summer upwelling period (February 2002) and the austral winter non-upwelling period (July 2001). Mean lipid-corrected delta C-13 (delta C-13(cor)) values ranged from -20.17 to -15.02%, and mean delta N-15 ranged from 10.28 to 16.08 parts per thousand. An analysis of covariance performed using length as a covariate provided evidence of seasonal effects on the mean fish delta(13)Ccor and delta N-15, with higher values during the non-upwelling period than during the upwelling period. These effects are most likely related to biophysical processes that occurred 1 to 6 mo earlier. The data furnish circumstantial evidence of a link between the dynamics of the SACW and the trophic structure of Cabo Frio. The trophic level of the species of fish and squids ranged between the theoretical trophic levels of 3.6 and 5.1, but there were no discrete steps, rather a continuous gradient in isotopic values. This suggests that these food webs are unstructured and the component species have mixed diets.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据