The interactive effects of temperature, trophic status, and the presence of an exotic clam on the performance of a native freshwater mussel
The interactive effects of temperature, trophic status, and the presence of an exotic clam on the performance of a native freshwater mussel
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DOI：
10.1007/s10750-017-3170-y
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发表时间：
2017-08-01
期刊：
影响因子：
2.6
通讯作者：
Pardo, Isabel
中科院分区：
文献类型：
--
作者：
Ferreira-Rodriguez, Noe;Pardo, Isabel
全球环境变化对全世界所有生态系统的生物多样性构成重大威胁。在这里，我们通过实验研究了温度和营养条件如何影响一个高度入侵的物种和一个本地的naiad物种之间的相互作用。我们暴露的本地淡水贻贝Unio delphinus的存在/不存在的入侵河蚬在三个温度水平和三个营养条件下。我们使用线性混合模型和分层划分来建模和检验每个变量在解释U。海豚粪便产量，这是作为营养富集的代理。海豚对高温的反应是较高的清除率和呼吸率，表明能量消耗增加。粪便产量变化显着，每个因素之间有一个相互作用的影响，随着温度和营养条件的增加，并在入侵蛤的存在下下降。层次分配模型表明，系统营养状况和C。fluminea是解释粪便产生的最重要的因素，其次是水温。耗尽能量储备以科普不断升高的温度可能会损害对额外压力的耐受性，例如与入侵物种的竞争或食物减少。
Global environmental changes constitute major threats to biodiversity in all ecosystems worldwide. Here we experimentally examined how temperature and trophic condition can influence the interaction between a highly invasive species and a native naiad species. We exposed the native freshwater mussel Unio delphinus to the presence/absence of the invasive Corbicula fluminea under three temperature levels and three trophic conditions. We used linear mixed models and hierarchical partitioning to model and test the independent effects of each variable in explaining U. delphinus feces production, which was used as a proxy for nutrient enrichment. Unio delphinus responded to high temperatures with higher clearance and respiration rates, showing an increase in energy expenditure. Feces production varied significantly with each factor and there was an interactive effect between the factors; increasing with temperature and trophic condition, and declining in the presence of the invasive clam. The hierarchical partitioning model showed that the system trophic condition and C. fluminea were the most important factors explaining feces production and to a lesser extent water temperature. Depletion of energetic reserves to cope with increasing temperatures could compromise the tolerance to additional stressors such as competition with invasive species or food reduction.