Runoff and the longitudinal distribution of macroinvertebrates in a glacier-fed stream: implications for the effects of global warming.

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dc.careerCiencias Biológicases
dc.category.authorguesten_US
dc.contributor.authorDangles, Olivier Jacques
dc.contributor.correspondingJacobsen, Dean
dc.countryEcuadores
dc.date.accessioned2023-11-04T21:36:05Z
dc.date.available2023-11-04T21:36:05Z
dc.date.issued2014
dc.description.abstractThe downstream pattern in benthic macroinvertebrate assemblages along glacier-fed streams is a result of decreasing glacial influence on environmental conditions. However, meltwater run-off shows temporal variation, reflected in differences in, for example, temperature, conductivity and turbidity. Consequently, depending on their run-off patterns, comparable environmental conditions may occur at different distances along glacier-fed streams. Our aim was to assess whether short-term variations in glacial run-off were reflected by changes in longitudinal distribution patterns of macroinvertebrates along a glacier-fed stream in the Ecuadorian Andes. We measured environmental parameters, obtained continuous gauging data, measured macroinvertebrate drift rate with an hourly resolution during glacial floods and sampled benthic macroinvertebrates c. 3-monthly for 30 months at three sites at varying distances (0.1–4.3 km) from the glacier. For each sampling date, we fitted logarithmic equations to plots of taxon richness versus distance from the glacier, calculated similarity in assemblage composition between sites and calculated weighted averages of mid-points of taxon distributions. These data were analysed in relation to mean maximum flow over the 45 days prior to sampling. Mean conductivity and temperature increased while turbidity decreased downstream. During glacial afternoon floods, conductivity decreased while temperature and turbidity increased. High flow moved maximal taxon richness downstream (reduced the slopes from logarithmic fits), while low flow made assemblages more downstream like (higher similarity with downstream assemblages). No significant relationships were found between weighted average distributions and flow. Drift rate (ind. h−1) increased by an order of magnitude at the onset of afternoon floods, and the taxa that contributed most to total drift were those whose benthic densities were most reduced by increases in flow. Our study provides hints as to how biological distribution patterns in glacier-fed streams might be affected by more permanent changes in run-off caused by glacial shrinkage. This study predicts a multidirectional shift in altitudinal/longitudinal species ranges, with a potential downward shift in species ranges as a consequence of global change.en_US
dc.facultyCiencias Exactas y Naturaleses
dc.id.author05H164551
dc.id.type1
dc.identifier.doiDOI: 10.1111/fwb.12405
dc.identifier.issn13652427 - 00465070
dc.identifier.urihttps://repositorio.puce.edu.ec/handle/123456789/5486
dc.identifier.urihttp://onlinelibrary.wiley.com/doi/10.1111/fwb.12405/abstract
dc.indexed.databaseScimago Journal Rankes
dc.language.isoen
dc.list.authorsJacobsen, D.
dc.magazine.pageRange2038–2050
dc.magazine.titleFreshwater Biologyen_US
dc.magazine.volumeChapter59 (10)
dc.rightsClosedAccessen
dc.statepublisheden_US
dc.subjectBenthoses
dc.subjectClimate changees
dc.subjectDriftes
dc.subjectElevational range shiftses
dc.subjectGlacial retreates
dc.subjectBenthos
dc.subjectClimate change
dc.subjectDrift
dc.subjectElevational range shifts
dc.subjectGlacial retreat
dc.titleRunoff and the longitudinal distribution of macroinvertebrates in a glacier-fed stream: implications for the effects of global warming.en_US
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