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首页> 外文期刊>Marine biology >Temporal and spatial variability in stable isotope ratios of SPM link to local hydrography and longer term SPM averages suggest heavy dependence of mussels on nearshore production
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Temporal and spatial variability in stable isotope ratios of SPM link to local hydrography and longer term SPM averages suggest heavy dependence of mussels on nearshore production

机译：SPM稳定同位素比与当地水文学的时空变化和长期SPM平均值表明贻贝严重依赖近岸生产

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摘要

Temporal changes in hydrography affect suspended particulate matter (SPM) composition and distribution in coastal systems, potentially influencing the diets of suspension feeders. Temporal variation in SPM and in the diet of the mussel Perna perna, were investigated using stable isotope analysis. The δ~(13)C and δ~(15) N ratios of SPM, mussels and macroalgae were determined monthly, with SPM samples collected along a 10 km onshore-offshore transect, over 14 months at Kenton-on-Sea, on the south coast of South Africa. Clear nearshore (0 km) to offshore (10 km) carbon depletion gradients were seen in SPM during all months and extended for 50 km offshore on one occasion. Carbon enrichment of coastal SPM in winter (June-August 2004 and May 2005) indicated temporal changes in the nearshore detrital pool, presumably reflecting changes in macroalgal detritus, linked to local changes in coastal hydrography and algal seasonality. Nitrogen patterns were less clear, with SPM enrichment seen between July and October 2004 from 0 to 10 km. Nearshore SPM demonstrated cyclical patterns in carbon over 24-h periods that correlated closely with tidal cycles and mussel carbon signatures, sampled monthly, demonstrated fluctuations that could not be correlated to seasonal or monthly changes in SPM. Macroalgae showed extreme variability in isotopic signatures, with no discernable patterns. IsoSource mixing models indicated over 50% reliance of mussel tissue on nearshore carbon, highlighting the importance of nearshore SPM in mussel diet. Overall, carbon variation in SPM at both large and small temporal scales can be related to hydrographic processes, but is masked in mussels by long-term isotope integration.
机译：水文学的时间变化会影响沿海系统中悬浮颗粒物（SPM）的组成和分布，可能会影响悬浮喂食器的饮食。使用稳定同位素分析研究了贻贝和贻贝贻贝的饮食中SPM的时间变化。每月测定SPM，贻贝和大型藻类的δ〜（13）C和δ〜（15）N比值，并在14个月的时间里，在海上肯顿海岸沿10公里的陆上-海上样带采集SPM样品。南非南部海岸。在所有月份中，SPM均观察到了近岸（0公里）至近海（10公里）的碳耗竭梯度，并且有一次延伸到近海50公里。冬季（2004年6月至8月和2005年5月）沿海SPM的碳富集表明，近岸碎屑池的时间变化，可能反映了大型藻碎屑的变化，这与沿海水文学和藻类季节性变化的局部影响有关。氮模式不太清楚，在2004年7月至10月之间，SPM富集从0到10 km。近岸SPM表现出碳在24小时内的周期性模式，与潮汐周期和贻贝碳特征密切相关，每月采样一次，表明其波动与SPM的季节性变化或月变化无关。大型藻类的同位素特征显示出极大的变异性，没有明显的模式。 IsoSource混合模型表明贻贝组织对近岸碳的依赖程度超过50％，突显了近岸SPM在贻贝饮食中的重要性。总体而言，大，小时间尺度上SPM中的碳变化都可能与水文过程有关，但在贻贝中却被长期同位素整合所掩盖。

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