The longest fragment drives fish beta diversity in fragmented river networks: Implications for river management and conservation

Díaz, Gustavo; Górski, Konrad; Heino, Jani; Arriagada, Pedro; Link, Oscar; Habit, Evelyn

doi:10.1016/j.scitotenv.2020.144323

Cited by 18 publications

(13 citation statements)

References 75 publications

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“…Multiple anthropogenic disturbances, such as dam construction, land use, water pollution, and overfishing, affected the diversity of fish in the freshwater ecosystems [ 3 , 8 , 44 , 45 ]. In this study, we found that the diversity of fish in the Lushan National Nature Reserve experienced a decline from 2008 to 2021.…”

Section: Discussionmentioning

confidence: 99%

“…Given that the fish species diversity and phylogenetic diversity indices were greatly impacted by multiple anthropogenic disturbances, we suggest related biodiversity conservation should be carried out, due to the need for environmental conservation in the reserve. We should appropriately manage small dams, land use, and water pollution, otherwise continuing environmental change will result in drastic losses of biodiversity, and local or global extinction may occur [ 3 , 8 , 44 , 45 ].…”

Section: Discussionmentioning

confidence: 99%

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Temporal Changes of Fish Diversity and Driver Factors in a National Nature Reserve, China

Luo

Wan

Jia

et al. 2022

Animals

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Freshwater-fish diversity declined rapidly due to multiple anthropogenic disturbances. The loss of fish diversity often manifested itself in taxonomic homogenization over time. Knowledge of multi-faceted diversity (i.e., species, functional, and phylogenetic diversity) perspectives is important for biodiversity assessment and conservation planning. Here, we analyzed the change of the species diversity and phylogenetic diversity of fish in 2008 and 2021 as well as explored the driver factors of the biodiversity patterns in the Lushan National Nature Reserve. The results showed that the species diversity and phylogenetic diversity of fish have declined from 2008 to 2021, with five species lost over time. We found an overall homogenization trend in the fish fauna of the study area, with a 4% increase in taxonomic similarity among the rivers. Additionally, we found that community structure of fish was significantly different among the rivers, and environmental filtering was the main contributor to the phylogenetic diversity of fish in 2008 and 2021. This study provides new insight into the patterns and drivers of fish-biodiversity change in the broader Yangtze River basin and informs management efforts.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Temporal Changes of Fish Diversity and Driver Factors in a National Nature Reserve, China

Luo

Wan

Jia

et al. 2022

Animals

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“…As in other rivers, migratory species were the first to respond, resulting in the extirpation of the two migratory species from the basin (G. australis and M. lapicida, e.g. Díaz et al, 2021). Finally, the refuge mechanism refers to habitat heterogeneity, which together promotes species survivorship and functional redundancy (Van Looy et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

A century of anthropogenic river alterations in a highly diverse river coastal basin: Effects on fish assemblages

Moraga

Vivancos²,

Ruiz³

et al. 2022

Front. Environ. Sci.

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The global increase in human population is driving a continuous conversion of land to anthropogenic uses. This is a major threat to lotic ecosystems worldwide, as it compromises the biotic integrity and health of rivers and streams. Studies in the northern hemisphere have shown that the effects of urbanization on fish assemblages include decrease and/or loss of diversity and abundance of native species, and a proliferation of tolerant exotic species. Such effects have not been widely studied in developing countries like Chile, where urbanization has impacted several river ecosystems. Over decades, the lower zone of the Andalién River in Central Chile has gone over intense non-planned urbanization stemming from the city of Concepción, leading to several physical alterations. The native fish and lamprey fauna of this coastal river basin has been reported as very diverse, with a total of 16 native species. However, this fauna has been affected by multiple effects of different land uses and direct alterations in the riverbed. To study how these fish and lamprey assemblages have changed, this paper compiles records from 1919 to 2018 and analyzes them in relation to the direct and indirect anthropogenic alterations in the basin. The results show a significant reduction in richness and abundance of native species, with only nine species currently. The two migratory lampreys, one of them endemic (Mordacia lapicida), have been extirpated from the Andalién River basin. Conversely, the richness and distribution of introduced species has increased throughout the river basin. The invasive species Gambusia holbrooki, first registered in 1999, is currently the most abundant in the urban zone of the river. Although the more substantial direct alterations of the riverbed occurred in the lower areas, a steeper reduction in native species richness occurred in the middle areas subjected to a long history of agricultural and forestry land use. We suggest the loss of resilience of the river ecosystem, and that the collapse of biodiversity in this river system demonstrates the lack of urban planning and the inefficiency of environmental regulations in protecting native species and ecosystems with high conservation value in Chile.

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“…Destacamos la importancia de medidas de manejo eficientes para la prevención y mitigación de los impactos generados por las represas, como es el otorgamiento por parte de las Autoridades de cuencas hidrográficas de un caudal ambiental que permita mantener la estructura, composición y el correcto funcionamiento del sistema fluvial y la provisión de servicios ecosistémicos (Fornaroli et al, 2020). Desde el punto de vista de la planificación y la gestión, se deben analizar en profundidad los impactos acumulativos, sinérgicos y residuales de los diferentes proyectos existentes, planeados y/o futuros que sean reguladores de caudales líquidos y sólidos en la cuenca hidrográfica, manteniendo afluentes no regulados que permitan la conservación y uso sostenible de la biodiversidad de peces endémicos (Díaz et al, 2021). Declaración de ética: los autores declaran que todos están de acuerdo con esta publicación y que han hecho aportes que justifican su autoría; que no hay conflicto de interés de ningún tipo; y que han cumplido con todos los requisitos y procedimientos éticos y legales pertinentes.…”

Section: Discussionunclassified

Diferencias en el tamaño corporal y la abundancia de peces altoandinos, arriba y abajo de la represa Neusa, Colombia

Olaya-Marín¹,

Lemus-Portillo

Pedraza³

et al. 2022

Rev. Biol. Trop.

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Introducción: Los ríos tropicales se ven cada vez más afectados por la fragmentación y la regulación; y, en Colombia, se sabe que las represas ponen en peligro a los peces endémicos debido, entre otros, a la migración limitada y la disponibilidad reducida de redes alimenticias basadas en el detrito. Sin embargo, el conocimiento de la ictiofauna nativa afectada por represas en ríos altoandinos es aún incipiente. Objetivo: Evaluar los efectos de la represa del Neusa sobre la ictiofauna. Métodos: Comparamos dos secciones del río, una aguas arriba y otra aguas abajo de la represa con el Sistema Richter IHA, muestreamos tres transectos de 100 m de largo en cada sección, cada dos meses, entre 2017 y 2019. Los peces fueron devueltos al río después de efectuadas las mediciones corporales. Resultados: Recolectamos 729 individuos de cinco familias; los Trichomycterus bogotense eran más pequeños aguas abajo de la represa; Oncorhynchus mykiss fue más pequeño y menos abundante; y no hubo diferencias para Grundulus bogotensis y Eremophilus mutisii. Independientemente de los factores climáticos, O. mykiss y G. bogotensis fueron más abundantes aguas arriba, y E. mutisii y T. bogotense aguas abajo de la represa. Conclusión: Las cinco especies de peces diferían en cómo las poblaciones se diferencian aguas arriba y aguas abajo de la represa, lo que sugiere que algunas se benefician de la represa, mientras que otras se vuelven más pequeñas y menos abundantes.

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The longest fragment drives fish beta diversity in fragmented river networks: Implications for river management and conservation

Cited by 18 publications

References 75 publications

Temporal Changes of Fish Diversity and Driver Factors in a National Nature Reserve, China

Temporal Changes of Fish Diversity and Driver Factors in a National Nature Reserve, China

A century of anthropogenic river alterations in a highly diverse river coastal basin: Effects on fish assemblages

Diferencias en el tamaño corporal y la abundancia de peces altoandinos, arriba y abajo de la represa Neusa, Colombia

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