Consumer body composition and community structure in a stream is altered by pH
Consumer body composition and community structure in a stream is altered by pH
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pH 值会改变溪流中消费者的身体成分和群落结构
DOI：
10.1111/j.1365-2427.2009.02305.x
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发表时间：
2010
影响因子：
2.7
通讯作者：
LARRAÑAGA A
中科院分区：
文献类型：
--
作者：
LARRAÑAGA A
1.低pH值抑制了落叶的微生物调节，这形成了许多源头河流的主要能量输入。 这降低了食物质量和粉碎机组合的可用性，从而在通过酸化食物网的能量和生物量通量中产生了潜在的瓶颈。2.我们通过量化三种主要粉碎机物种（Leuctra nigra，L. 3.总类群丰富度随pH值的增加而增加，切碎机多样性也随pH值的增加而增加。 耐酸性石松L.黑，表现出pH值和蛋白质含量之间的正相关性，但其丰度受到抑制，在较低的酸达到。这些结果表明，环境压力的影响可能会表现出不同的人口（即数量和生物量丰度）与生理（即个人的蛋白质含量）水平的组织。体成分河马和N.在野外条件下，pictetii与pH值之间没有显著的相关性。 pictetii，其中存活率，生长率，蛋白质和脂质含量的个人进行了测量，在不同的pH值和酸与circumneutral微生物调节制度的溪流水。酸处理的叶子与死亡率增加和消费者组织中蛋白质含量降低有关，酸性水也具有后一种效应。5.我们的研究结果表明，关键类群中的生化约束可能会在基于碎屑的食物网中产生能量通量瓶颈，这可能最终决定整个系统的生产力。 因此，大型无脊椎动物的身体成分的测定可能是一个有效的新工具，补充人口水平的研究，在新鲜的沃茨的压力的影响。
1. Low pH inhibits microbial conditioning of leaf‐litter, which forms the principal energy input to many headwater streams. This reduces food quality and availability for the shredder assemblage, thereby creating a potential bottleneck in the flux of energy and biomass through acidified food webs.2. We explored the consequences of acidity on the well‐characterised community of Broadstone Stream in southeast England, by quantifying the physiological condition (protein and lipid content) of three dominant shredder species (Leuctra nigra,L. hippopusandNemurella pictetii) and relating this to changes in the numerical abundance and biomass of invertebrates across a longitudinal pH gradient (5.3–6.5).3. Total taxon richness increased with pH, as did shredder diversity. The acid‐tolerant stonefly,L. nigra, exhibited a positive correlation between pH and protein content, but its abundance was suppressed in the less acid reaches. These results suggest that the impacts of environmental stressors might be manifested differently at the population (i.e. numerical and biomass abundance) versus the physiological (i.e. protein content of individuals) levels of organisation. Body composition ofL. hippopusandN. pictetiidid not exhibit any significant relationship with stream pH in the field.4. The survey data were corroborated with a laboratory rearing experiment usingN. pictetii, in which survival rate, growth rate, and protein and lipid content of individuals were measured in stream water of differing pH and acid versus circumneutral microbial conditioning regimes. Acid‐conditioned leaves were associated with increased mortality and reduced protein content in consumers’ tissues, with acid water also having the latter effect.5. Our results suggest that biochemical constraints within key taxa might create energy flux bottlenecks in detrital‐based food webs, and that this could ultimately determine the productivity of the entire system. Hence assays of the body composition of macroinvertebrates could be an effective new tool that complements population level studies of the impacts of stressors in fresh waters.
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DOI：
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发表时间：
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DOI：
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发表时间：
2003
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影响因子：
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作者：
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影响因子：
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