Factors Affecting the Benthic Community Structure of a Discontinuous Stream in Guadelupe Mountains National Park, Texas

Meyerhoff, Richard; Lind, Owen T.

doi:10.1002/iroh.19870720304

Cited by 8 publications

(6 citation statements)

References 26 publications

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“…In addition, CÉRÉGHINO et al (1997) noted a decrease in density and biomass for six trichopteran species in a downstream section of a Pyrenean stream. In periphyton habitats in the rhithral the increased trichopteran diversity was supported by the fact that overall species diversity is related positively to periphyton biomass (MEYERHOFF and LIND, 1987). DE MARCH (1976) also observed that macroinvertebrate species richness may decrease as interstitial spaces are filled in by sediment and detritus.…”

Section: Discussionmentioning

confidence: 92%

“…In studies of macrozoobenthic communities, CIANFICCONI et al (1991) and DOLÉDEC (1989) also found a decrease in trichopteran fauna in downstream river sections. On the other hand, habitat diversity increases with increased substrate size and, consequently, invertebrate biomass, density, and species richness also increase (REICE, 1980;MEYERHOFF and LIND, 1987). The decrease of trichopteran biomass and species diversity in downstream river sections can be associated with a downstream increase in substrate uniformity.…”

Section: Discussionmentioning

confidence: 99%

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Vegetation Cover and Substrate Type as Factors Influencing the Spatial Distribution of Trichopterans along a Karstic River

Habdija

Radanović

Primc-Habdija

et al. 2002

Internat. Rev. Hydrobiol.

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In the longitudinal continuum of the Kupa River the vegetation cover and substrate type were the important environmental factors influencing the spatial differences in the biomass and community composition. Of total macroinvertebrate biomass, a significantly greater percentage of trichopterans was found on boulder and cobble substrata covered with moss (54.3% on boulders, 55.8% on cobbles) than on substrata covered with periphyton (9.9% on boulders, 14.8% on cobbles). In the potamal, trichopterans were markedly reduced (<2.5% of total macroinvertebrate biomass) on gravel substrata. A comparison of the Shannon diversity index values suggested that for trichopteran species diversity the substrate type was a more influential factor than vegetation cover. On the other hand, multidimensional scaling analysis showed that trichopteran community composition was related more significantly to vegetation cover and river area than to substrate type. In the rhithral the vegetation cover was an important factor influencing the functional feeding group composition of trichopterans. The spatial distribution of scrapers and filtering collectors depended significantly on the vegetation cover associated with substrate type, and shredder trichopterans were related to vegetation cover only. Predatory trichopterans made up 17–65% of total predator biomass, and in the rhithron area they were correlated significantly only with vegetation cover. On gravel substrata in the potamal, vegetation cover did not affect the spatial distribution of shredder and collector‐filterer trichopterans significantly.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Vegetation Cover and Substrate Type as Factors Influencing the Spatial Distribution of Trichopterans along a Karstic River

Habdija

Radanović

Primc-Habdija

et al. 2002

Internat. Rev. Hydrobiol.

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“…Temporary rivers function as metacommunities, as discussed below, with the additional complications of variable hydrological connectivity, and multiple dispersal paths (water, air and dry riverbed). A survey of categorical studies suggests that fish and invertebrate communities are generally depauperate in disconnected pools compared with connected pools, and that disconnected pool communities are often subsets of connected pool communities (Meyerhoff & Lind, 1987;Taylor, 1997;Taylor & Warren, 2001;Bonada et al, 2006). The metacommunity in a chain of disconnected pools may have a longitudinally nested pattern, with progressively smaller sub-sets of aquatic species assemblages along the chain (Taylor, 1997) (Fig.…”

Section: Temporary-river Ecology 721mentioning

confidence: 99%

Emerging concepts in temporary‐river ecology

Datry²,

et al. 2010

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SUMMARY1. Temporary rivers and streams are among the most common and most hydrologically dynamic freshwater ecosystems. The number of temporary rivers and the severity of flow intermittence may be increasing in regions affected by climatic drying trends or water abstraction. Despite their abundance, temporary rivers have been historically neglected by ecologists. A recent increase in temporary-river research needs to be supported by new models that generate hypotheses and stimulate further research. In this article, we present three conceptual models that address spatial and temporal patterns in temporary-river biodiversity and biogeochemistry. 2. Temporary rivers are characterised by the repeated onset and cessation of flow, and by complex hydrological dynamics in the longitudinal dimension. Longitudinal dynamics, such as advancing and retreating wetted fronts, hydrological connections and disconnections, and gradients in flow permanence, influence biotic communities and nutrient and organic matter processing. 3. The first conceptual model concerns connectivity between habitat patches. Variable connectivity suggests that the metacommunity and metapopulation concepts are applicable in temporary rivers. We predict that aggregations of local communities in the isolated water bodies of temporary rivers function as metacommunities. These metacommunities may become longitudinally nested due to interspecific differences in dispersal and mortality. The metapopulation concept applies to some temporary river species, but not all. In stable metapopulations, rates of local extinction are balanced by recolonisation. However, extinction and recolonisation in many temporary-river species are decoupled by frequent disturbances, and populations of these species are usually expanding or contracting. 4. The second conceptual model predicts that large-scale biodiversity varies as a function of aquatic and terrestrial patch dynamics and water-level fluctuations. Habitat mosaics in temporary rivers change in composition and configuration in response to inundation and drying, and these changes elicit a range of biotic responses. In the model, aquatic biodiversity initially increases directly with water level due to increasing abundance of aquatic patches. When most of the channel is inundated and most aquatic patches are connected, further increases in aquatic habitat and connectivity cause aquatic biodiversity to decline due to community homogenisation and reduced habitat diversity. The predicted responses of terrestrial biodiversity to changes in water level are the inverse of aquatic biodiversity responses. 5. The third conceptual model represents temporary rivers as longitudinal, punctuated biogeochemical reactors. Advancing fronts carry water, solutes and particulate organic matter downstream; subsequent flow recessions and drying result in deposition of transported material in reserves such as pools and bar tops. Material processing is rapid during inundated periods and slower during dry periods. The efficiency of material proc...

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“…Similarly, in fragmented streams of warmer climate regions, it was found that macro-invertebrate abundances temporally vary during the drying process and may increase soon after pool isolation in response to contracting habitat space, and subsequently decrease due to the deteriorating environmental conditions (PETERSON et al, 2001;ACUÑA et al, 2005). Moreover, pools of a fragmented stream can differ in the community structure of aquatic organisms (MEYERHOFF and LIND, 1987;STANLEY et al, 1997).…”

Section: Macro-invertebrate Responsementioning

confidence: 97%

Leaf Decay Processes during and after a Supra‐Seasonal Hydrological Drought in a Temperate Lowland Stream

Schlief

Mutz

2011

International Review of Hydrobiology

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Climate change models for Central Europe predict hydrological drought with fragmentation into pools during periods of high litter input in numerous lowland streams, presumably affecting in-stream leaf decay processes. To investigate this assumption, we measured physicochemical parameters, macroinvertebrate colonization, microbial activity, and decay rates of exposed leaves during and after a supraseasonal drought in a German lowland stream. Microbial activity, shredder colonization and leaf decay rates during fragmentation were low, presumably caused by drought-related environmental conditions. Microbial activity and temperature-corrected decay rates increased after the flow resumption but not leaf mass loss and shredder colonization. During both periods, exposed leaves appeared physically unaffected suggesting strongly reduced shredder-mediated leaf decay despite shredder presence. Our results indicate that hydrological drought can affect organisms and processes in temperate lowland streams even after flow resumption, and should be considered in climate change scenarios. IntroductionThe decomposition of allochthonous organic matter, such as leaf litter from riparian trees, is a major ecosystem-level process in streams running through forested watersheds (WEB- STER and BENFIELD, 1986;ABELHO, 2001). Leaves are processed by a complex interaction of several abiotic and biotic processes, such as physical leaching, mechanical abrasion, microbial degradation, and consumption by macro-invertebrates (leaf shredders). Aquatic hyphomycetes play a predominant role in microbial leaf decay (HIEBER and GESSNER, 2002;PASCOAL and CÁSSIO, 2004), as they rapidly colonize submerged leaves, degrade plant cell polymers (CHAMIER, 1985) and increase the palatability of leaves for shredders (GRAÇA and CANHOTO, 2006). Fine organic particles and dissolved compounds resulting from leaf decay serve as energy sources for various consumers (BENFIELD, 1996). Hence, understanding the responses of in-stream leaf decay processes to climate change is central to interpreting and predicting the impacts of climate change on stream ecosystems.Higher temperatures, locally reduced precipitation and increased frequency and duration of extreme events (e.g., seasonal and supra-seasonal hydrological droughts) are expect-* Corresponding author 634 J. SCHLIEF and M. MUTZ

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Factors Affecting the Benthic Community Structure of a Discontinuous Stream in Guadelupe Mountains National Park, Texas

Cited by 8 publications

References 26 publications

Vegetation Cover and Substrate Type as Factors Influencing the Spatial Distribution of Trichopterans along a Karstic River

Vegetation Cover and Substrate Type as Factors Influencing the Spatial Distribution of Trichopterans along a Karstic River

Emerging concepts in temporary‐river ecology

Leaf Decay Processes during and after a Supra‐Seasonal Hydrological Drought in a Temperate Lowland Stream

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