George Gavrielides, Ginny L. Adams, S. Reid Adams, Matthew H. Connolly
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引用次数: 0
Abstract
Fish assemblages in freshwater ecosystems are becoming more homogenous from multiple abiotic, environmental, and physicochemical variables at different scales. Historical fish collections (1976–1977) by Billy Michael Johnson and Dr. Johnson K. Beadles were compared to contemporary fish collections (2018–2019) in tributaries of the Eleven Point River basin in Arkansas to examine patterns of fish assemblage change. Fish assemblage change variables were compared to pasture land use/land cover (LULC) at multiple scales and in-stream habitat variables to understand relationships and discover potential correlates suggesting biotic homogenization. Fish assemblages in the Eleven Point River basin of Arkansas have experienced significant spatiotemporal changes, and LULC change and habitat alterations may have influenced this process. Increased tolerant species and decreased intolerant species at sites contributed to biotic homogenization, particularly in pool habitats. Surprisingly, expansion of some intolerant fishes was also observed that tend to occupy riffles. Sites with high percentages of pasture LULC at finer spatial scales typically had more homogenised fish assemblages. We hypothesized gravel aggradation from local pasture land use has degraded pools and increased riffle habitat, resulting in homogenised fish assemblages in the Eleven Point River basin over the study period. Few studies link LULC, in-stream habitat, and biotic homogenization when examining fish assemblage change over time, and these dynamics can be particularly complex in upland streams experiencing gravel aggradation. Similar research in other upland, gravel-bed river systems would provide a broad understanding of the presented environmental associations.
不同尺度的多种非生物、环境和物理化学变量使淡水生态系统中的鱼类组合变得越来越单一。比利-迈克尔-约翰逊(Billy Michael Johnson)和约翰逊-K-贝德尔斯博士(Dr. Johnson K. Beadles)对阿肯色州十一点河流域支流的历史鱼类采集(1976-1977 年)与当代鱼类采集(2018-2019 年)进行了比较,以研究鱼类组合变化的模式。将鱼类组合变化变量与多种尺度的牧场土地利用/土地覆盖(LULC)和溪流生境变量进行了比较,以了解两者之间的关系,并发现表明生物同质化的潜在相关因素。阿肯色州十一点河流域的鱼类组合经历了显著的时空变化,LULC 的变化和栖息地的改变可能对这一过程产生了影响。在一些地点,耐受性物种增加,不耐受性物种减少,促进了生物同质化,尤其是在池塘栖息地。令人惊讶的是,还观察到一些不耐受的鱼类也在扩大,它们倾向于占据溪流。在更细的空间尺度上,牧场 LULC 百分比较高的地点,其鱼类组合的同质性通常更高。我们推测,当地牧场土地利用造成的砾石沉积使水池退化,增加了涟漪生境,从而导致研究期间十一点河流域鱼类种群的同质化。在研究鱼类组合随时间的变化时,很少有研究将 LULC、溪流栖息地和生物同质化联系起来,而在经历砾石侵蚀的高地溪流中,这些动态变化尤为复杂。在其他高地、砾石河床河流系统中开展类似研究,将有助于广泛了解所呈现的环境关联。
期刊介绍:
Ecology of Freshwater Fish publishes original contributions on all aspects of fish ecology in freshwater environments, including lakes, reservoirs, rivers, and streams. Manuscripts involving ecologically-oriented studies of behavior, conservation, development, genetics, life history, physiology, and host-parasite interactions are welcomed. Studies involving population ecology and community ecology are also of interest, as are evolutionary approaches including studies of population biology, evolutionary ecology, behavioral ecology, and historical ecology. Papers addressing the life stages of anadromous and catadromous species in estuaries and inshore coastal zones are considered if they contribute to the general understanding of freshwater fish ecology. Theoretical and modeling studies are suitable if they generate testable hypotheses, as are those with implications for fisheries. Manuscripts presenting analyses of published data are considered if they produce novel conclusions or syntheses. The journal publishes articles, fresh perspectives, and reviews and, occasionally, the proceedings of conferences and symposia.