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Agriculture impairs stream ecosystem functioning in a tropical catchment

dc.contributor.authorCornejo A.
dc.contributor.authorPérez J.
dc.contributor.authorLópez-Rojo N.
dc.contributor.authorTonin A.M.
dc.contributor.authorRovira D.
dc.contributor.authorCheca B.
dc.contributor.authorJaramillo N.
dc.contributor.authorCorrea K.
dc.contributor.authorVillarreal A.
dc.contributor.authorVillarreal V.
dc.contributor.authorGarcía G.
dc.contributor.authorPérez E.
dc.contributor.authorRíos González T.A.
dc.contributor.authorAguirre Y.
dc.contributor.authorCorrea-Araneda F.
dc.contributor.authorBoyero L.
dc.date.accessioned2020-09-02T22:15:29Z
dc.date.available2020-09-02T22:15:29Z
dc.date.issued2020
dc.identifier10.1016/j.scitotenv.2020.140950
dc.identifier.citation745, , -
dc.identifier.issn00489697
dc.identifier.urihttps://hdl.handle.net/20.500.12728/4076
dc.descriptionThe expansion of agriculture is particularly worrying in tropical regions of the world, where native forests are being replaced by crops at alarming rates, with severe consequences for biodiversity and ecosystems. However, there is little information about the potential effects of agriculture on the functioning of tropical streams, which is essential if we are to assess the condition and ecological integrity of these ecosystems. We conducted a litter decomposition experiment in streams within a tropical catchment, which were subjected to different degrees of agricultural influence: low (protected area, PA), medium (buffer area, BA) and high (agricultural area, AA). We quantified decomposition rates of litter enclosed within coarse-mesh and fine-mesh bags, which allowed the distinction of microbial and detritivore-mediated decomposition pathways. We used litter of three riparian species representing a gradient in litter quality (Alnus acuminata > Ficus insipida > Quercus bumelioides), and examined detritivore assemblages through the contents of litterbags and benthic samples. We found that the increasing agricultural influence promoted microbial decomposition, probably due to nutrient-mediated stimulation; and inhibited detritivore-mediated and total decomposition because of reduced detritivore numbers, most likely caused by pesticides and sedimentation. Effects were evident for Alnus and Ficus, but not for Quercus, which was barely decomposed across the gradient. Our study provides key evidence about the impact of agriculture on tropical stream ecosystem functioning, which is associated to changes in stream assemblages and may have far-reaching repercussions for global biochemical cycles. © 2020 The Authors
dc.language.isoen
dc.publisherElsevier B.V.
dc.subjectDetritivore assemblages
dc.subjectEcosystem functional integrity
dc.subjectLand use
dc.subjectLeaf litter breakdown
dc.subjectNutrient concentrations
dc.subjectPesticide toxicity
dc.subjectAgricultural robots
dc.subjectBiodiversity
dc.subjectCatchments
dc.subjectConservation
dc.subjectForestry
dc.subjectMesh generation
dc.subjectRunoff
dc.subjectStream flow
dc.subjectTropics
dc.subjectAgricultural areas
dc.subjectDecomposition pathway
dc.subjectDecomposition rate
dc.subjectEcological integrity
dc.subjectLitter decomposition
dc.subjectMicrobial decomposition
dc.subjectPotential effects
dc.subjectStream ecosystems
dc.subjectEcosystems
dc.subjectpesticide
dc.subjectbiodiversity
dc.subjectcatchment
dc.subjectflow modeling
dc.subjecthydrological cycle
dc.subjectstreamflow
dc.subjectagricultural influence
dc.subjectagricultural procedures
dc.subjectalder
dc.subjectAlnus acuminata
dc.subjectArticle
dc.subjectbenthos
dc.subjectcatchment area (hydrology)
dc.subjectcontrolled study
dc.subjectdetritivore
dc.subjectecosystem
dc.subjectenvironmental protection
dc.subjectFicus
dc.subjectFicus insipida
dc.subjectlitter decomposition
dc.subjectmicrobial degradation
dc.subjectoak
dc.subjectpopulation abundance
dc.subjectpriority journal
dc.subjectQuercus bumelioides
dc.subjectriparian species
dc.subjectsedimentation
dc.subjectspecies diversity
dc.subjectstream (river)
dc.subjecttropics
dc.subjectAlnus
dc.subjectAlnus acuminata
dc.subjectFicus insipida
dc.subjectQuercus
dc.titleAgriculture impairs stream ecosystem functioning in a tropical catchment
dc.typeArticle


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