Disentangling the pathways of land use impacts on the functional structure of fish assemblages in Amazon streams
Autor(a) principal: | |
---|---|
Data de Publicação: | 2018 |
Outros Autores: | , , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional do INPA |
Texto Completo: | https://repositorio.inpa.gov.br/handle/1/16238 |
Resumo: | Agricultural land use is a primary driver of environmental impacts on streams. However, the causal processes that shape these impacts operate through multiple pathways and at several spatial scales. This complexity undermines the development of more effective management approaches, and illustrates the need for more in-depth studies to assess the mechanisms that determine changes in stream biodiversity. Here we present results of the most comprehensive multi-scale assessment of the biological condition of streams in the Amazon to date, examining functional responses of fish assemblages to land use. We sampled fish assemblages from two large human-modified regions, and characterized stream conditions by physical habitat attributes and key landscape-change variables, including density of road crossings (i.e. riverscape fragmentation), deforestation, and agricultural intensification. Fish species were functionally characterized using ecomorphological traits describing feeding, locomotion, and habitat preferences, and these traits were used to derive indices that quantitatively describe the functional structure of the assemblages. Using structural equation modeling, we disentangled multiple drivers operating at different spatial scales, identifying causal pathways that significantly affect stream condition and the structure of the fish assemblages. Deforestation at catchment and riparian network scales altered the channel morphology and the stream bottom structure, changing the functional identity of assemblages. Local deforestation reduced the functional evenness of assemblages (i.e. increased dominance of specific trait combinations) mediated by expansion of aquatic vegetation cover. Riverscape fragmentation reduced functional richness, evenness and divergence, suggesting a trend toward functional homogenization and a reduced range of ecological niches within assemblages following the loss of regional connectivity. These results underscore the often-unrecognized importance of different land use changes, each of which can have marked effects on stream biodiversity. We draw on the relationships observed herein to suggest priorities for the improved management of stream systems in the multiple-use landscapes that predominate in human-modified tropical forests. © 2017 The Authors |
id |
INPA-2_b3ecadc0043e5949e1654271d9d8c377 |
---|---|
oai_identifier_str |
oai:repositorio:1/16238 |
network_acronym_str |
INPA-2 |
network_name_str |
Repositório Institucional do INPA |
repository_id_str |
|
spelling |
Leitão, Rafael PereiraZuanon, JansenMouillot, DavidLeal, Cecília GontijoHughes, Robert MasonKaufmann, Philip RobertVill?ger, S?bastiendos Santos Pompeu, PauloKasper, DanielePaula, Felipe Rossetti deFerraz, Silvio Frosini de BarrosGardner, Toby Alan2020-06-01T14:25:51Z2020-06-01T14:25:51Z2018https://repositorio.inpa.gov.br/handle/1/1623810.1111/ecog.02845Agricultural land use is a primary driver of environmental impacts on streams. However, the causal processes that shape these impacts operate through multiple pathways and at several spatial scales. This complexity undermines the development of more effective management approaches, and illustrates the need for more in-depth studies to assess the mechanisms that determine changes in stream biodiversity. Here we present results of the most comprehensive multi-scale assessment of the biological condition of streams in the Amazon to date, examining functional responses of fish assemblages to land use. We sampled fish assemblages from two large human-modified regions, and characterized stream conditions by physical habitat attributes and key landscape-change variables, including density of road crossings (i.e. riverscape fragmentation), deforestation, and agricultural intensification. Fish species were functionally characterized using ecomorphological traits describing feeding, locomotion, and habitat preferences, and these traits were used to derive indices that quantitatively describe the functional structure of the assemblages. Using structural equation modeling, we disentangled multiple drivers operating at different spatial scales, identifying causal pathways that significantly affect stream condition and the structure of the fish assemblages. Deforestation at catchment and riparian network scales altered the channel morphology and the stream bottom structure, changing the functional identity of assemblages. Local deforestation reduced the functional evenness of assemblages (i.e. increased dominance of specific trait combinations) mediated by expansion of aquatic vegetation cover. Riverscape fragmentation reduced functional richness, evenness and divergence, suggesting a trend toward functional homogenization and a reduced range of ecological niches within assemblages following the loss of regional connectivity. These results underscore the often-unrecognized importance of different land use changes, each of which can have marked effects on stream biodiversity. We draw on the relationships observed herein to suggest priorities for the improved management of stream systems in the multiple-use landscapes that predominate in human-modified tropical forests. © 2017 The AuthorsVolume 41, Número 1, Pags. 219-232Attribution-NonCommercial-NoDerivs 3.0 Brazilhttp://creativecommons.org/licenses/by-nc-nd/3.0/br/info:eu-repo/semantics/openAccessBiodiversityCatchmentChannel MorphologyDeforestationDivergenceDominanceEnvironmental ImpactHabitat FragmentationLand-use ChangeStreamVegetation CoverAmazoniaDisentangling the pathways of land use impacts on the functional structure of fish assemblages in Amazon streamsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleEcographyengreponame:Repositório Institucional do INPAinstname:Instituto Nacional de Pesquisas da Amazônia (INPA)instacron:INPAORIGINALDisentangling.pdfapplication/pdf1516986https://repositorio.inpa.gov.br/bitstream/1/16238/1/Disentangling.pdf2750cdb75cdedad0d6f268f19f1e8a66MD51CC-LICENSElicense_rdfapplication/octet-stream914https://repositorio.inpa.gov.br/bitstream/1/16238/2/license_rdf4d2950bda3d176f570a9f8b328dfbbefMD521/162382020-07-14 11:34:42.901oai:repositorio:1/16238Repositório de PublicaçõesPUBhttps://repositorio.inpa.gov.br/oai/requestopendoar:2020-07-14T15:34:42Repositório Institucional do INPA - Instituto Nacional de Pesquisas da Amazônia (INPA)false |
dc.title.en.fl_str_mv |
Disentangling the pathways of land use impacts on the functional structure of fish assemblages in Amazon streams |
title |
Disentangling the pathways of land use impacts on the functional structure of fish assemblages in Amazon streams |
spellingShingle |
Disentangling the pathways of land use impacts on the functional structure of fish assemblages in Amazon streams Leitão, Rafael Pereira Biodiversity Catchment Channel Morphology Deforestation Divergence Dominance Environmental Impact Habitat Fragmentation Land-use Change Stream Vegetation Cover Amazonia |
title_short |
Disentangling the pathways of land use impacts on the functional structure of fish assemblages in Amazon streams |
title_full |
Disentangling the pathways of land use impacts on the functional structure of fish assemblages in Amazon streams |
title_fullStr |
Disentangling the pathways of land use impacts on the functional structure of fish assemblages in Amazon streams |
title_full_unstemmed |
Disentangling the pathways of land use impacts on the functional structure of fish assemblages in Amazon streams |
title_sort |
Disentangling the pathways of land use impacts on the functional structure of fish assemblages in Amazon streams |
author |
Leitão, Rafael Pereira |
author_facet |
Leitão, Rafael Pereira Zuanon, Jansen Mouillot, David Leal, Cecília Gontijo Hughes, Robert Mason Kaufmann, Philip Robert Vill?ger, S?bastien dos Santos Pompeu, Paulo Kasper, Daniele Paula, Felipe Rossetti de Ferraz, Silvio Frosini de Barros Gardner, Toby Alan |
author_role |
author |
author2 |
Zuanon, Jansen Mouillot, David Leal, Cecília Gontijo Hughes, Robert Mason Kaufmann, Philip Robert Vill?ger, S?bastien dos Santos Pompeu, Paulo Kasper, Daniele Paula, Felipe Rossetti de Ferraz, Silvio Frosini de Barros Gardner, Toby Alan |
author2_role |
author author author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Leitão, Rafael Pereira Zuanon, Jansen Mouillot, David Leal, Cecília Gontijo Hughes, Robert Mason Kaufmann, Philip Robert Vill?ger, S?bastien dos Santos Pompeu, Paulo Kasper, Daniele Paula, Felipe Rossetti de Ferraz, Silvio Frosini de Barros Gardner, Toby Alan |
dc.subject.eng.fl_str_mv |
Biodiversity Catchment Channel Morphology Deforestation Divergence Dominance Environmental Impact Habitat Fragmentation Land-use Change Stream Vegetation Cover Amazonia |
topic |
Biodiversity Catchment Channel Morphology Deforestation Divergence Dominance Environmental Impact Habitat Fragmentation Land-use Change Stream Vegetation Cover Amazonia |
description |
Agricultural land use is a primary driver of environmental impacts on streams. However, the causal processes that shape these impacts operate through multiple pathways and at several spatial scales. This complexity undermines the development of more effective management approaches, and illustrates the need for more in-depth studies to assess the mechanisms that determine changes in stream biodiversity. Here we present results of the most comprehensive multi-scale assessment of the biological condition of streams in the Amazon to date, examining functional responses of fish assemblages to land use. We sampled fish assemblages from two large human-modified regions, and characterized stream conditions by physical habitat attributes and key landscape-change variables, including density of road crossings (i.e. riverscape fragmentation), deforestation, and agricultural intensification. Fish species were functionally characterized using ecomorphological traits describing feeding, locomotion, and habitat preferences, and these traits were used to derive indices that quantitatively describe the functional structure of the assemblages. Using structural equation modeling, we disentangled multiple drivers operating at different spatial scales, identifying causal pathways that significantly affect stream condition and the structure of the fish assemblages. Deforestation at catchment and riparian network scales altered the channel morphology and the stream bottom structure, changing the functional identity of assemblages. Local deforestation reduced the functional evenness of assemblages (i.e. increased dominance of specific trait combinations) mediated by expansion of aquatic vegetation cover. Riverscape fragmentation reduced functional richness, evenness and divergence, suggesting a trend toward functional homogenization and a reduced range of ecological niches within assemblages following the loss of regional connectivity. These results underscore the often-unrecognized importance of different land use changes, each of which can have marked effects on stream biodiversity. We draw on the relationships observed herein to suggest priorities for the improved management of stream systems in the multiple-use landscapes that predominate in human-modified tropical forests. © 2017 The Authors |
publishDate |
2018 |
dc.date.issued.fl_str_mv |
2018 |
dc.date.accessioned.fl_str_mv |
2020-06-01T14:25:51Z |
dc.date.available.fl_str_mv |
2020-06-01T14:25:51Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://repositorio.inpa.gov.br/handle/1/16238 |
dc.identifier.doi.none.fl_str_mv |
10.1111/ecog.02845 |
url |
https://repositorio.inpa.gov.br/handle/1/16238 |
identifier_str_mv |
10.1111/ecog.02845 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Volume 41, Número 1, Pags. 219-232 |
dc.rights.driver.fl_str_mv |
Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Ecography |
publisher.none.fl_str_mv |
Ecography |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional do INPA instname:Instituto Nacional de Pesquisas da Amazônia (INPA) instacron:INPA |
instname_str |
Instituto Nacional de Pesquisas da Amazônia (INPA) |
instacron_str |
INPA |
institution |
INPA |
reponame_str |
Repositório Institucional do INPA |
collection |
Repositório Institucional do INPA |
bitstream.url.fl_str_mv |
https://repositorio.inpa.gov.br/bitstream/1/16238/1/Disentangling.pdf https://repositorio.inpa.gov.br/bitstream/1/16238/2/license_rdf |
bitstream.checksum.fl_str_mv |
2750cdb75cdedad0d6f268f19f1e8a66 4d2950bda3d176f570a9f8b328dfbbef |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 |
repository.name.fl_str_mv |
Repositório Institucional do INPA - Instituto Nacional de Pesquisas da Amazônia (INPA) |
repository.mail.fl_str_mv |
|
_version_ |
1797064409372164096 |