Relative roles of spatial processes, natural factors and anthropogenic stressors in structuring a lake macroinvertebrate metacommunity

摘要: Studies of aquatic metacommunities have so far been focused almost entirely on relatively isolated systems, such as a set streams, lakes or ponds. Here, we aimed to quantify the relative importance spatial processes, natural factors and anthropogenic stressors in structuring macroinvertebrate metacommunity within large, highly-connected shallow lake system. The roles different drivers were evaluated for entire metacommunity, 10 trait-based deconstructed four common species by incorporating extensive sampling large number abiotic explanatory variables. Contrary our expectations, found that variation community structure among sites was mostly correlated wind-wave variables rather than disturbance even though presented strong environmental gradients associated with long-term human pressures. In addition, three groups varied slightly trait matrices (i.e. based dispersal ability, feeding mode degree occurrence). Importantly, distributions most showed significant autocorrelation, indicating prominent role high rate their distributions. These findings suggest influences rates may override organization systems. Hence, strongly encourage processes are taken into account development bioassessment approaches