Invertebrate metacommunity structure and dynamics in an Andean glacial stream network facing climate change

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dc.careerCiencias Biológicases
dc.category.authorvisitoren_US
dc.contributor.authorJacobsen, Dean
dc.contributor.authorDangles, Olivier Jacques
dc.contributor.correspondingDangles, Olivier Jacques
dc.countryEcuadores
dc.date.accessioned2023-11-04T21:38:57Z
dc.date.available2023-11-04T21:38:57Z
dc.date.issued2015-08-26
dc.dedication.authorTPes
dc.description.abstractUnder the ongoing climate change, understanding the mechanisms structuring the spatial distribution of aquatic species in glacial stream networks is of critical importance to predict the response of aquatic biodiversity in the face of glacier melting. In this study, we propose to use metacommunity theory as a conceptual framework to better understand how river network structure influences the spatial organization of aquatic communities in glacierized catchments. At 51 stream sites in an Andean glacierized catchment (Ecuador), we sampled benthic macroinvertebrates, measured physico-chemical and food resource conditions, and calculated geographical, altitudinal and glaciality distances among all sites. Using partial redundancy analysis, we partitioned community variation to evaluate the relative strength of environmental conditions (e.g., glaciality, food resource) vs. spatial processes (e.g., overland, watercourse, and downstream directional dispersal) in organizing the aquatic metacommunity. Results revealed that both environmental and spatial variables significantly explained community variation among sites. Among all environmental variables, the glacial influence component best explained community variation. Overland spatial variables based on geographical and altitudinal distances significantly affected community variation. Watercourse spatial variables based on glaciality distances had a unique significant effect on community variation. Within alpine catchment, glacial meltwater affects macroinvertebrate metacommunity structure in many ways. Indeed, the harsh environmental conditions characterizing glacial influence not only constitute the primary environmental filter but also, limit water-borne macroinvertebrate dispersal. Therefore, glacier runoff acts as an aquatic dispersal barrier, isolating species in headwater streams, and preventing non-adapted species to colonize throughout the entire stream network. Under a scenario of glacier runoff decrease, we expect a reduction in both environmental filtering and dispersal limitation, inducing a taxonomic homogenization of the aquatic fauna in glacierized catchments as well as the extinction of specialized species in headwater groundwater and glacier-fed streams, and consequently an irreversible reduction in regional diversity.en_US
dc.facultyCiencias Exactas y Naturaleses
dc.id.author05-H164551
dc.id.author1721572491
dc.id.type2
dc.identifier.doi10.1371/journal.pone.0136793
dc.identifier.issn1932-6203
dc.identifier.urihttps://repositorio.puce.edu.ec/handle/123456789/5716
dc.identifier.urihttp://dx.doi.org/10.1371/journal.pone.0136793
dc.indexed.databaseScimago Journal Rankes
dc.language.isoen
dc.list.authorsCauvy, S., Espinosa, R., Andino, P., Jacobsen, D., & Dangles, O.
dc.magazine.pageRange1-19
dc.magazine.titlePlos Oneen_US
dc.magazine.volumeChapter10(8)
dc.rightsClosedAccessen
dc.statepublisheden_US
dc.subjectEcologíaes
dc.subjectTaxonomíaes
dc.subjectDiversidad de especieses
dc.subjectCambio climáticoes
dc.subjectEcología
dc.subjectTaxonomía
dc.subjectDiversidad de especies
dc.subjectCambio climático
dc.titleInvertebrate metacommunity structure and dynamics in an Andean glacial stream network facing climate changeen_US
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