Biomass distribution of fishes and mussels mediates spatial and temporal heterogeneity in nutrient cycling in streams
Biomass distribution of fishes and mussels mediates spatial and temporal heterogeneity in nutrient cycling in streams
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鱼类和贻贝的生物量分布调节溪流养分循环的空间和时间异质性
DOI：
10.1007/s00442-018-4277-1
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发表时间：
2018
期刊：
影响因子：
2.7
通讯作者：
Gates, Kiza K.
中科院分区：
文献类型：
--
作者：
Hopper, Garrett W.;Gido, Keith B.;Vaughn, Caryn C.;Parr, Thomas B.;Popejoy, Traci G.;Atkinson, Carla L.;Gates, Kiza K.
动物可以在营养循环中发挥重要作用，但研究人员通常将栖息在动态环境中的动物群落简化为在相对静态条件下进行测试的单一群体。我们提出了一个概念框架，并提出了经验证据CND认为在动态生态系统中的空间重叠的动物群体的潜在影响。由于溪流可以保持高生物量的贻贝和鱼类，我们能够评估这一框架，通过测试，如果由稳定的贻贝聚集产生的生物地球化学热点吸引鱼类。我们预测，这些群体之间的空间重叠可能会增加矿化养分的流量。我们量化了不同的鱼类组合生物量之间的贻贝床达到和达到没有贻贝。我们比较了鱼类和贻贝生物量在贻贝床，以测试是否在动物生物量的差异介导的营养循环，通过氮和磷的排泄。我们通过结合生物量估计和测量的排泄率来估计每组的面积排泄率。鱼类生物量分布均匀，除了低流量的一段时间后，鱼类更集中在贻贝床。贻贝生物量始终是一个数量级大于鱼类生物量和贻贝面积排泄率超过鱼类排泄率。然而，这些差异的大小在空间和时间上各不相同。贻贝排泄物化学计量随组合组成的变化而变化，而鱼类排泄物化学计量变化不大。与贻贝相关的生物地球化学热点一般不与鱼群重叠，因此，在这些条件下，动物过程似乎施加添加剂生态系统的影响。
Animals can play important roles in cycling nutrients [hereafter consumer-driven nutrient dynamics (CND)], but researchers typically simplify animal communities inhabiting dynamic environments into single groups that are tested under relatively static conditions. We propose a conceptual framework and present empirical evidence for CND that considers the potential effects of spatially overlapping animal groups within dynamic ecosystems. Because streams can maintain high biomass of mussels and fish, we were able to evaluate this framework by testing if biogeochemical hotspots generated by stable aggregations of mussels attract fishes. We predicted that spatial overlap between these groups may increase the flux of mineralized nutrients. We quantified how different fish assemblage biomass was between mussel bed reaches and reaches without mussels. We compared fish and mussel biomass at mussel beds to test whether differences in animal biomass mediate their contributions to nutrient cycling through nitrogen and phosphorous excretion. We estimated areal excretion rates for each group by combining biomass estimates with measured excretion rates. Fish biomass was homogeneously distributed, except following a period of low flow when fish were more concentrated at mussel beds. Mussel biomass was consistently an order of magnitude greater than fish biomass and mussel areal excretion rates exceeded fish excretion rates. However, the magnitude of those differences varied spatially and temporally. Mussel excretion stoichiometry varied with changes in assemblage composition, while fish excretion stoichiometry varied little. Biogeochemical hotspots associated with mussels did not generally overlap with fish aggregations, thus, under these conditions, animal processes appear to exert additive ecosystem effects.
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Astyanax aeneus（Characidae）鱼作为低营养新热带溪流中关键营养物回收者的作用。
影响因子：
4.8
作者：
G. Small;C. Pringle;M. Pyron;J. Duff
通讯作者：
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影响因子：
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作者：
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影响因子：
2.7
作者：
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通讯作者：
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影响因子：
2.9
作者：
S. Ross;W. J. Matthews;A. Echelle
通讯作者：
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影响因子：
2.7
作者：
D. Spooner;C. Vaughn
通讯作者：
C. Vaughn