Determining spatial changes in the diet of nearshore suspension-feeders along the South African coastline: Stable isotope and fatty acid signatures

被引:58
作者
Allan, E. Louise [1 ]
Ambrose, Shan T. [1 ]
Richoux, Nicole B. [1 ]
Froneman, P. William [1 ]
机构
[1] Rhodes Univ, Dept Zool & Entomol, ZA-6140 Grahamstown, South Africa
基金
新加坡国家研究基金会; 美国安德鲁·梅隆基金会;
关键词
upwelling; rocky shore; Perna perna; diet markers; diatoms; dinoflagellates; ROCKY INTERTIDAL COMMUNITIES; MARINE ECOSYSTEMS; ORGANIC-MATTER; FOOD; PHYTOPLANKTON; BIOMARKERS; CARBON; LINK; DENITRIFICATION; FRACTIONATION;
D O I
10.1016/j.ecss.2010.02.004
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Mesoscale oceanographic features, such as upwellings, are known to play an important role in regulating the structure and productivity of nearshore marine communities. Stable isotope (delta C-13 and delta N-15) and fatty acid analyses were employed to assess the influence of an upwelling cell along the south-eastern coastline of southern Africa on the diet of the mussel, Perna perna. Eight sites were sampled: two upstream, three in the vicinity and three downstream of the upwelling cell. Stable isotope and fatty acid signatures indicated that the mussels consumed a diet of detritus derived mainly from macroalgae, diatoms and dinoflagellates. One-way ANOVA on the delta C-13 and delta N-15 signatures and the principal component analysis of the fatty acid profiles of the mussels identified distinct groups corresponding to the above mentioned regions. The proportion of diatom biomarkers in the fatty acid profiles decreased downstream of the upwelling region while the proportion of dinoflagellate biomarkers increased. Upwelling regions are typically associated with elevated levels of productivity; however, these systems usually become silicon depleted and result in the replacement of diatoms with dinoflagellates. The highest proportions of the dinoflagellate markers were recorded in the two furthest sites downstream of the upwelling cell. The spatial variation in the diet of the mussels, therefore, appears to reflect the presence of the upwelling cell in the nearshore biology of the region. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码:463 / 471
页数:9
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