Élida Jeronimo Gouveia , Diego Corrêa Alves , Miguel Petrere Jr. , Angelo Antonio Agostinho
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引用次数: 0
Abstract
The introduction of species has negative effects on biodiversity and ecosystem functioning, with these impacts typically mediated by interspecific relationships. This study aimed to assess intraspecific and interspecific interactions, the effect of flood duration on the abundance of the congeners Megaleporinus piavussu (native) and M. macrocephalus (non-native), as well as variations in life-history traits across temporal scale for native species (pre- and post-invasion) and spatial scale for the non-native species (original and invaded environment). We tested the interaction effects between both species in population dynamics models. In contrast, life-history traits estimates for both species were obtained using length-frequency. The significant intraspecific competition coefficient suggests a negative impact on the annual per capita growth rate of both species. Only the native species population exhibited a significant interspecific competition coefficient. Flood duration positively affected the growth rate of both species, with more pronounced effects on the population of M. piavussu. During coexistence periods of the species (post-invasion period and invaded environments), a higher mean condition factor, female dominance, asymptotic length, longevity, and total mortality, including fishing mortality, were registered. On the other hand, the pre-invasion period for M. piavussu and the original environment for M. macrocephalus showed numerically lower values for life-history traits. Our findings suggest that the impact of the interspecific competition coefficient may be more pronounced for native species than for non-native species. Furthermore, the life history attributes of these species varied between the evaluated periods and locations in response to environmental conditions and food resource availability.
期刊介绍:
This journal provides an international forum for the publication of papers in the areas of fisheries science, fishing technology, fisheries management and relevant socio-economics. The scope covers fisheries in salt, brackish and freshwater systems, and all aspects of associated ecology, environmental aspects of fisheries, and economics. Both theoretical and practical papers are acceptable, including laboratory and field experimental studies relevant to fisheries. Papers on the conservation of exploitable living resources are welcome. Review and Viewpoint articles are also published. As the specified areas inevitably impinge on and interrelate with each other, the approach of the journal is multidisciplinary, and authors are encouraged to emphasise the relevance of their own work to that of other disciplines. The journal is intended for fisheries scientists, biological oceanographers, gear technologists, economists, managers, administrators, policy makers and legislators.