Percorrer por autor "Esser, Luiz Fernando"
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- Anthropogenic Barriers Limit Fish Access to Essential Habitats in the Amazon in the Face of Climate ChangePublication . Yofukuji, Kátia Yasuko; Fabrin, Thomaz Mansini Carrenho; Stabile, Bruno Henrique Mioto; Agostinho, Angelo Antonio; Jézéquel, Céline; Batista‐Silva, Valéria Flávia; Esser, Luiz Fernando; Ferreira, José Hilário Delconte; Ré, Reginaldo; Tedesco, Pablo A.; Azevedo, João C.; Bailly, DayaniBarriers represent one of the greatest threats to river integrity and freshwater fish, as they fragment habitats and impair species dispersal, particularly in a scenario of climate change. In this context, we applied a novel framework that combined predictions of species distribution models with a river connectivity index to identify accessible and climatic‐environmental suitable habitats for frugivorous and socioeconomically important fish in the Amazon basin. We also ranked dams based on their potential for river fragmentation and blocking access to climate refuge for fish species that provide essential ecosystem functions and services in the Amazon. Our results revealed that there are still extensive areas that remain both connected and climatic‐environmentally suitable along the Amazon‐Solimões rivers, acting as core areas for fish dispersal and tracking suitable habitats. However, the planned expansion of hydropower infrastructure combined with climate change can lead to a contraction of areas that will remain simultaneously climatic‐environmental suitable and connected. By identifying and ranking the most impactful barriers, our results can provide innovative and applicable information for sustainable energy planning decisions in the Amazon. These results can inform policies and conservation actions aimed at preserving river connectivity, biodiversity, and ecosystem services under rapidly changing conditions.
- Climate change affects the potential distribution of a Neotropical freshwater migratory fishPublication . Souza, Beatriz Cristinade Paula de; Possamai, Luana Caroliny; Yofukuji, Katia Yasuko; Lopes, Taise Miranda; Esser, Luiz Fernando; Ferreira, José Hilário Delconte; Ré, Reginaldo; Graça, Weferson Júnio da; Silva, Ana Francisca Gomes da; Ozório, Jefferson Matheus Barros; Bailly, Dayani; Batista-Silva, Valéria FláviaClimate change represents an increasing threat to freshwater ecosystems. In this scenario, this study investigated the impacts of these changes on the distribution of Megaleporinus obtusidens, a long-distance migratory species from the Paraná-Paraguay basin, and identified the main climate-environmental attributes associated with its occurrence. For this purpose, a combined projection approach with multiple algorithms was used to estimate environmental suitability and distribution of the species, as well as to identify climate refugia under different future scenarios. Thermal amplitude and river order were the attributes with the greatest contribution to the model. Although much of the basin currently provides favorable conditions for M. obtusidens, a reduction of 46.9% in climatically suitable areas is predicted by 2050 and 88.0% by 2090 under a pessimistic scenario. By the end of the century, climate refugia will be concentrated in the upper stretches of tributaries on the left bank of the upper Paraná River and along its main channel. The loss of suitable areas exceeds the gains, which are restricted to the upper Paraná River. These results highlight the vulnerability of M. obtusidens to climate change, emphasizing the need for conservation plans focused on protecting these refugia to ensure the species’ persistence in the basin.