Small-scale spatial distribution of an exotic amphipod in a forest fragment and native species planting
DOI:
https://doi.org/10.5216/rbn.v6i2.12853Keywords:
Amphipod, invasive species, Atlantic Forest, anthropogenic disturbance, Talitroides topitotumAbstract
Anthropogenic interferences in natural environments cause the breakage of spatial and competitive barriers, which may influence the spatial distribution of species. In this study, we describe the spatial distribution of an exotic amphipod, Talitroides topitotum, in two distinct sites, a forest fragment and a plantation of native arboreal species. We analyzed possible variations in this spatial distribution in different periods of the year and verified whether the vegetation cover and the litter 36 layer depth may explain the distribution pattern of this species. We performed analyses of frequency distribution to determine the pattern of this species spatial distribution, as well as correlation tests to determine the effect of these two variables of habitat structure. The spatial distribution analysis revealed that T. topitotum presents aggregated distribution in both areas, indicating that this species has low environmental demands or that both areas are below a minimum environmental quality threshold. However, even with this similarity, the population in the fragmented site presented a higher index of aggregation when compared with the population of the plantation site. Corroborating previousstudies, there was a negative correlation between abundance of T. topitotum and litter layer depth in the plantation site. Studies on invaded habitats can help understand how invasive species occupy new environments and the factors that can influence their spatial distribution.
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