The importance of autotroph distribution to mussel growth in a well-mixed, temperate estuary
The importance of autotroph distribution to mussel growth in a well-mixed, temperate estuary
复制标题
在混合良好的温带河口自养分布对贻贝生长的重要性
DOI：
10.2307/1352448
复制
发表时间：
1993
期刊：
影响因子：
--
通讯作者：
C. Simenstad
中科院分区：
文献类型：
--
作者：
M. Ruckelshaus;R. Wissmar;C. Simenstad
在这项研究中，我们探讨了混合良好的河口的二次生产在多大程度上反映了栖息地生物和物理特征的局部差异，或受淡水-海洋梯度控制的更大范围的河口范围特征。我们解决了以下问题：河口栖息地内的塞斯顿有机成分在多大程度上反映了当地自养生物的分布，以及河口消费者（例如固着滤食动物）在多大程度上对混合良好的河口栖息地特征的小规模局部差异做出了反应？我们比较了华盛顿州帕迪拉湾河口内四个地点的栖息地质量和消费者增长，这些地点代表了太平洋西北河口有机碳的主要自养来源（即浮游植物、大叶藻（大叶藻）、表栖和大型藻类物种以及沼泽大型植物）。稳定碳同位素的自然丰度{ie898-1}用于解决饮食中有机碳的来源蓝贻贝（Mytilus edulis），一种代表性的悬浮饲养者。为了评估消费者对栖息地、质量的反应，我们将食用食物的数量和质量以及物理参数的测量与贻贝生长的原位测定结合起来。我们使用食品质量{ie898-2}和消费者反应（移植贻贝生长）的测量来整合河口物理和生物特征的高度变异对初级和次级生产的影响。使用方差分析，我们检测到四个代表性栖息地的海藻食物浓度、海藻成分（如 {ie898-3} 所示）和贻贝 {ie898-4} 值和生长速率的显着差异。贻贝组织的 {ie898-5} 值的显着差异与栖息地中当地自养生物和海藻的 {ie898-6} 值的显着差异相对应，表明帕迪拉湾的贻贝主要依赖当地的碳源作为食物。整个河口的贻贝生长与海水{ie898-7}和盐度显着相关。我们得出的结论是，当地贻贝成分和贻贝生长率的差异部分反映了帕迪拉湾底栖初级生产者栖息地的异质性分布，尽管其性质混合良好。此外，与整个海湾的淡水-海水梯度相反，盐度水平的局部差异解释了海湾内贻贝生长差异的很大一部分。我们的结果反驳了整个混合良好的河口的水质量和消费者生产具有可比性的预测，并表明河口次级生产中物理和化学确定的梯度范式需要扩大以包括当地的生物因素。
In this study, we explored the extent to which secondary production in a well-mixed estuary reflects local differences in biotic and physical characteristics of habitats, or larger-scale, estuary-wide characteristics governed by a freshwater-marine gradient. We addressed the following questions: To what extent do organic components of seston within habitats in an estuary reflect distributions of local autotrophs and to what extent do estuarine consumers such as sessile filter-feeders, respond to small-scale, local differences in habitat characteristics in a wellmixed estuary? We contrasted habitat quality and consumer growth at four sites within Padilla Bay estuary, Washington, representing the major autotrophic sources of organic carbon in Pacific Northwest estuaries (i.e., phytoplankton, eelgrass (Zostera marina), epibenthic and macro-algal species, and marsh macrophytes.) The natural abundances of stable carbon isotopes {ie898-1} were used to resolve origins of organic carbon in diets of blue mussels (Mytilus edulis), a representative suspension feeder. To assess consumer responses to habitat, quality, we combined measures of sestonic food quantity and quality and physical parameters with in situ determination of mussel growth. We used measures of food quality {ie898-2} and consumer response (growth of transplanted mussels) to integrate the effects of high variability in estuarine physical and biological characteristics on primary and secondary production. Using ANOVA, we detected significant differences in the concentrations of sestonic food, seston composition as indicated by {ie898-3}, and mussel {ie898-4} values and growth rates among the four representative habitats. That significant differences in {ie898-5} values of mussel tissue corresponded to the significant differences in {ie898-6} values of local autotrophs and seston among habitats suggests that mussels in Padilla Bay rely primarily on local sources of carbon for food. Mussel growth throughout, the estuary was significantly correlated with both sestonic {ie898-7} and salinity. We conclude that differences in local seston composition and mussel growth rates reflect in part the heterogeneous, distribution of benthic primary producer habitats in Padilla Bay, despite its well-mixed nature. In addition, local differences in salinity levels, as opposed to the bay-wide freshwater-marine, gradient, explained a significant proportion of the variance in mussel growth within the bay. Our results counter the prediction that seston quality and consumer production are comparable throughout well-mixed estuaries, and suggest that the paradigm of physically and chemically determined gradients in estuarine secondary production needs to be broadened to include local biotic factors as well.
影响因子：
5
作者：
DENIRO, MJ;EPSTEIN, S
通讯作者：
EPSTEIN, S