Contrasting change in taxonomic vs. functional diversity of tropical fish communities after habitat degradation
Human activities have strong impacts on ecosystem functioning through their effect on abiotic factors and on biodiversity. There is also growing evidence that species functional traits link changes in species composition and shifts in ecosystem processes. Hence, it appears to be of utmost importance to quantify modifications in the functional structure of species communities after human disturbance in addition to changes in taxonomic structure. Despite this fact, there is still little consensus on the actual impacts of human-mediated habitat alteration on the components of biodiversity, which include species functional traits. Therefore, we studied changes in taxonomic diversity (richness and evenness), in functional diversity, and in functional specialization of estuarine fish communities facing drastic environmental and habitat alterations. The Terminos Lagoon (Gulf of Mexico) is a tropical estuary of primary concern for its biodiversity, its habitats, and its resource supply, which have been severely impacted by human activities. Fish communities were sampled in four zones of the Terminos Lagoon 18 years apart (1980 and 1998). Two functions performed by fish (food acquisition and locomotion) were studied through the measurement of 16 functional traits. Functional diversity of fish communities was quantified using three independent components: richness, evenness, and divergence. Additionally, we measured the degree of functional specialization in fish communities.
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| Subjects: | Ictiofauna, Degradación ambiental, Impacto ambiental, Taxonomía, Cambio medioambiental global, Estuarios tropicales, Ecomorfología, Conservación del hábitat, Artfrosur, |
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Ictiofauna Degradación ambiental Impacto ambiental Taxonomía Cambio medioambiental global Estuarios tropicales Ecomorfología Conservación del hábitat Artfrosur Ictiofauna Degradación ambiental Impacto ambiental Taxonomía Cambio medioambiental global Estuarios tropicales Ecomorfología Conservación del hábitat Artfrosur |
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Ictiofauna Degradación ambiental Impacto ambiental Taxonomía Cambio medioambiental global Estuarios tropicales Ecomorfología Conservación del hábitat Artfrosur Ictiofauna Degradación ambiental Impacto ambiental Taxonomía Cambio medioambiental global Estuarios tropicales Ecomorfología Conservación del hábitat Artfrosur Villeger, Sebastien Ramos Miranda, Julia autor/a Flores Hernández, Domingo autor/a 13527 Mouillot, David autor/a Contrasting change in taxonomic vs. functional diversity of tropical fish communities after habitat degradation |
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Human activities have strong impacts on ecosystem functioning through their effect on abiotic factors and on biodiversity. There is also growing evidence that species functional traits link changes in species composition and shifts in ecosystem processes. Hence, it appears to be of utmost importance to quantify modifications in the functional structure of species communities after human disturbance in addition to changes in taxonomic structure. Despite this fact, there is still little consensus on the actual impacts of human-mediated habitat alteration on the components of biodiversity, which include species functional traits. Therefore, we studied changes in taxonomic diversity (richness and evenness), in functional diversity, and in functional specialization of estuarine fish communities facing drastic environmental and habitat alterations. The Terminos Lagoon (Gulf of Mexico) is a tropical estuary of primary concern for its biodiversity, its habitats, and its resource supply, which have been severely impacted by human activities. Fish communities were sampled in four zones of the Terminos Lagoon 18 years apart (1980 and 1998). Two functions performed by fish (food acquisition and locomotion) were studied through the measurement of 16 functional traits. Functional diversity of fish communities was quantified using three independent components: richness, evenness, and divergence. Additionally, we measured the degree of functional specialization in fish communities. |
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Ictiofauna Degradación ambiental Impacto ambiental Taxonomía Cambio medioambiental global Estuarios tropicales Ecomorfología Conservación del hábitat Artfrosur |
| author |
Villeger, Sebastien Ramos Miranda, Julia autor/a Flores Hernández, Domingo autor/a 13527 Mouillot, David autor/a |
| author_facet |
Villeger, Sebastien Ramos Miranda, Julia autor/a Flores Hernández, Domingo autor/a 13527 Mouillot, David autor/a |
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Villeger, Sebastien |
| title |
Contrasting change in taxonomic vs. functional diversity of tropical fish communities after habitat degradation |
| title_short |
Contrasting change in taxonomic vs. functional diversity of tropical fish communities after habitat degradation |
| title_full |
Contrasting change in taxonomic vs. functional diversity of tropical fish communities after habitat degradation |
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Contrasting change in taxonomic vs. functional diversity of tropical fish communities after habitat degradation |
| title_full_unstemmed |
Contrasting change in taxonomic vs. functional diversity of tropical fish communities after habitat degradation |
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contrasting change in taxonomic vs. functional diversity of tropical fish communities after habitat degradation |
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AT villegersebastien contrastingchangeintaxonomicvsfunctionaldiversityoftropicalfishcommunitiesafterhabitatdegradation AT ramosmirandajuliaautora contrastingchangeintaxonomicvsfunctionaldiversityoftropicalfishcommunitiesafterhabitatdegradation AT floreshernandezdomingoautora13527 contrastingchangeintaxonomicvsfunctionaldiversityoftropicalfishcommunitiesafterhabitatdegradation AT mouillotdavidautora contrastingchangeintaxonomicvsfunctionaldiversityoftropicalfishcommunitiesafterhabitatdegradation |
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KOHA-OAI-ECOSUR:498362020-11-25T15:30:45ZContrasting change in taxonomic vs. functional diversity of tropical fish communities after habitat degradation Villeger, Sebastien Ramos Miranda, Julia autor/a Flores Hernández, Domingo autor/a 13527 Mouillot, David autor/a textengHuman activities have strong impacts on ecosystem functioning through their effect on abiotic factors and on biodiversity. There is also growing evidence that species functional traits link changes in species composition and shifts in ecosystem processes. Hence, it appears to be of utmost importance to quantify modifications in the functional structure of species communities after human disturbance in addition to changes in taxonomic structure. Despite this fact, there is still little consensus on the actual impacts of human-mediated habitat alteration on the components of biodiversity, which include species functional traits. Therefore, we studied changes in taxonomic diversity (richness and evenness), in functional diversity, and in functional specialization of estuarine fish communities facing drastic environmental and habitat alterations. The Terminos Lagoon (Gulf of Mexico) is a tropical estuary of primary concern for its biodiversity, its habitats, and its resource supply, which have been severely impacted by human activities. Fish communities were sampled in four zones of the Terminos Lagoon 18 years apart (1980 and 1998). Two functions performed by fish (food acquisition and locomotion) were studied through the measurement of 16 functional traits. Functional diversity of fish communities was quantified using three independent components: richness, evenness, and divergence. Additionally, we measured the degree of functional specialization in fish communities.We used a null model to compare the functional and the taxonomic structure of fish communities between 1980 and 1998. Among the four largest zones studied, three did not show strong functional changes. In the northern part of the lagoon, we found an increase in fish richness but a significant decrease of functional divergence and functional specialization. We explain this result by a decline of specialized species (i.e., those with particular combinations of traits), while newly occurring species are redundant with those already present. The species that decreased in abundance have functional traits linked to seagrass habitats that regressed consecutively to increasing eutrophication. The paradox found in our study highlights the need for a multifaceted approach in the assessment of biodiversity changes in communities under pressure.Human activities have strong impacts on ecosystem functioning through their effect on abiotic factors and on biodiversity. There is also growing evidence that species functional traits link changes in species composition and shifts in ecosystem processes. Hence, it appears to be of utmost importance to quantify modifications in the functional structure of species communities after human disturbance in addition to changes in taxonomic structure. Despite this fact, there is still little consensus on the actual impacts of human-mediated habitat alteration on the components of biodiversity, which include species functional traits. Therefore, we studied changes in taxonomic diversity (richness and evenness), in functional diversity, and in functional specialization of estuarine fish communities facing drastic environmental and habitat alterations. The Terminos Lagoon (Gulf of Mexico) is a tropical estuary of primary concern for its biodiversity, its habitats, and its resource supply, which have been severely impacted by human activities. Fish communities were sampled in four zones of the Terminos Lagoon 18 years apart (1980 and 1998). Two functions performed by fish (food acquisition and locomotion) were studied through the measurement of 16 functional traits. Functional diversity of fish communities was quantified using three independent components: richness, evenness, and divergence. Additionally, we measured the degree of functional specialization in fish communities.We used a null model to compare the functional and the taxonomic structure of fish communities between 1980 and 1998. Among the four largest zones studied, three did not show strong functional changes. In the northern part of the lagoon, we found an increase in fish richness but a significant decrease of functional divergence and functional specialization. We explain this result by a decline of specialized species (i.e., those with particular combinations of traits), while newly occurring species are redundant with those already present. The species that decreased in abundance have functional traits linked to seagrass habitats that regressed consecutively to increasing eutrophication. The paradox found in our study highlights the need for a multifaceted approach in the assessment of biodiversity changes in communities under pressure.IctiofaunaDegradación ambientalImpacto ambientalTaxonomíaCambio medioambiental globalEstuarios tropicalesEcomorfologíaConservación del hábitatArtfrosurEcological Applications |