Predator driven niches vary spatially among co-occurring damselfly species
Predator driven niches vary spatially among co-occurring damselfly species
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捕食者驱动的生态位在共生豆娘物种之间存在空间差异
DOI：
10.1007/s10682-019-09975-2
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发表时间：
2019
影响因子：
1.9
通讯作者：
Siepielski, Adam M.
中科院分区：
文献类型：
--
作者：
Bried, Jason T.;Siepielski, Adam M.
确定生态位差异如何促进本地物种共存是一个棘手的问题。先前的研究表明，形成生态位分化的生态和进化过程在种群之间是不同的，这表明物种之间生态位差异的强度也应该在地理上有所不同。这一观点的大多数测试比较的是不同地点的不同物种，而不是不同地点的同一物种。因此，尚不清楚生态位差异在空间上的差异是由于群落组成的差异，还是由于同一物种的种群经历了生态位效应强度的差异。为了验证后一种假设，我们使用了野外实验来操纵两个湖泊中相同的一对绿足自蝇物种的相对丰度。操纵相对丰度使我们能够量化生态位差异的人口特征，从而稳定共存，因为如果物种是生态位分化的，它们在面对共同的鱼类捕食者时应该经历更低的死亡率，在面对资源竞争时应该经历更高的增长，当稀有时。我们发现，当这两个物种在一个地方罕见时，它们的死亡率都较低，而在另一个地方则不然。没有发现生长差异，表明对猎物资源的竞争可能不是影响共存的关键因素。这些结果表明，物种在种群之间的生态差异是在对共同捕食者的反应中形成生存的方式，这应该促进它们的共存。我们讨论了可能导致物种生态位差异的几个因素，重点讨论了物种生态位差异的局地演化和环境因子的空间变异。因此，我们认为“物种共存”的问题不是物种的问题，而是理解物种种群是否共存的问题。这样的结果暗示了微进化过程在构建群落中的作用。
Determining how niche differences contribute to local species coexistence is a vexing problem. Previous work has shown that the ecological and evolutionary processes shaping niche differentiation can vary among populations, suggesting that the strength of niche differences among species should likewise vary geographically. Most tests of this idea compare different species in different locations, not the same species in different locations. Thus, it is unclear whether niche differences vary spatially because of variation in community composition or because populations of the same species experience differences in the strength of niche effects. To test this latter hypothesis, we used field experiments to manipulate the relative abundances of the same pair ofEnallagmadamselfly species at two lakes. Manipulating relative abundances allowed us to quantify the demographic signature of niche differences that could stabilize coexistence, because if species are niche differentiated, they should experience lower mortality in response to their shared fish predator, and higher growth in the face of resource competition, when rare. We found that both species experienced lower mortality when rare in one location but not the other. No differences in growth were detected, indicating that competition for prey resources may not be a key factor affecting coexistence. These results suggest the species are ecologically differentiated among populations in ways shaping survivorship in response to a shared predator, which should promote their coexistence. We discuss several factors that could contribute to the differences we observed, focusing on the ideas that either (1) niche differentiation between species evolves locally, or that (2) spatial variation in environmental factors affects the manifestation of species niche differences. We therefore argue that the problem of ‘species coexistence’ is not a problem of species, but rather is one of understanding if species’ populations coexist. Such results imply a role for microevolutionary processes in structuring communities.
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影响因子：
2.7
作者：
Cothran, Rickey D.;Noyes, Patrick;Relyea, Rick A.
通讯作者：
Relyea, Rick A.
过去的选择影响水生营养级联的强度
影响因子：
5.2
作者：
B. H. Ousterhout;Savannah R. Graham;A. Hasik;M. Serrano;A. Siepielski
通讯作者：
A. Siepielski
稀有生态位和物种的生态等效性
影响因子：
1.6
作者：
S. Haney;Matthew Cattivera;A. Siepielski
通讯作者：
A. Siepielski
豆娘组合β多样性构建中的利基与中立
影响因子：
2.7
作者：
A. Siepielski;M. McPeek
通讯作者：
M. McPeek
两种多样化的故事：沿着池塘永久性梯度，栖息地相互转变以填充生态空间
DOI：
10.1086/509045
发表时间：
2006
期刊：
The American Naturalist
影响因子：
--
作者：
R. Stoks;M. McPeek
通讯作者：
M. McPeek