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Marten, Michael

doi:10.1023/a:1011447307618

Cited by 16 publications

(2 citation statements)

References 13 publications

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“…There was no evidence that biotic interactions were a major source of long-term inter-annual variability in the present study, although such effects may be difficult if not impossible to detect using standard bioassessment protocols. Apart from invasion by non-native species, long-term changes in community structure resulting from biotic interactions have rarely been recorded in bioassessment studies (but see Marten 2001), and may represent an under-recognized cause of variability in benthic macroinvertebrate assemblages.…”

Section: Discussionmentioning

confidence: 99%

“…For example, Scarsbrook and others (2000) demonstrated that improvements seen in impaired streams over 8 years could not be distinguished from similar changes observed in reference streams. Similarly, Marten (2001) showed that the supposed recovery of macroinvertebrate diversity in the Rhine River did not reflect a return to historic conditions but instead a shift to a new community dominated by recent invaders from the Danube River. Durance and Ormerord (2007) used long-term data to show that directional and cyclic changes in climate have distinguishable impacts on macroinvertebrate communities in streams with neutral chemistry.…”

Section: Discussionmentioning

confidence: 99%

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Long-Term Variability in Bioassessments: A Twenty-Year Study from Two Northern California Streams

Mazor

Purcell

Resh

2009

Environmental Management

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Long-term variability of bioassessments has not been well evaluated. We analyzed a 20-year data set (1984–2003) from four sites in two northern California streams to examine the variability of bioassessment indices (two multivariate RIVPACS-type O/E scores and one multimetric index of biotic integrity, IBI), as well as eight metrics. All sites were sampled in spring; one site was also sampled in summer. Variability among years was high for most metrics (coefficients of variation, CVs ranging from 16% to 246% in spring) but lower for indices (CVs of 22–26% for the IBI and 21–32% for O/E scores in spring), which resulted in inconsistent assessments of biological condition. Variance components analysis showed that the time component explained variability in all metrics and indices, ranging from 5% to 35% of total variance explained. The site component was large (i.e., >40%) for some metrics (e.g., EPT richness), but nearly absent from others (e.g., Diptera richness). Seasonal analysis at one site showed that variability among seasons was small for some metrics or indices (e.g., Coleoptera richness), but large for others (e.g., EPT richness, O/E scores). Climatic variables did not show consistent trends across all metrics, although several were related to the El Niño Southern Oscillation Index at some sites. Bioassessments should incorporate temporal variability during index calibration or include climatic variability as predictive variables to improve accuracy and precision. In addition, these approaches may help managers anticipate alterations in reference streams caused by global climate change and high climatic variability.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Long-Term Variability in Bioassessments: A Twenty-Year Study from Two Northern California Streams

Mazor

Purcell

Resh

2009

Environmental Management

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Mayflies (Ephemeroptera) as indicators of environmental changes in the past five decades: a case study from the Morava and Odra River Basins (Czech Republic)

Zedková

Rádková

Bojková

et al. 2014

Aquatic Conservation

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Large‐scale and intensive human activities have caused widespread and profound changes in the diversity and structure of biological communities. Historical or long‐term data are an important tool for the quantification and understanding of temporal changes. A comparison of Ephemeroptera collected at 60 streams in the Morava and Odra river basins in two periods, 1955–1960 and 2006–2011, enabled an estimate of changes in their assemblages induced by various human pressures to be made. The taxonomic composition of mayfly assemblages was substantially dissimilar between the two periods, although the changes were not associated with a decline in regional or local diversity. Only lowland rivers lost several of their original species, mostly habitat specialists. Species replacement, a leading driver of dissimilarity, caused shifts towards more simplified, less specialized assemblages in large rivers, and towards more pollution‐ and siltation‐tolerant assemblages in small rivers. The increase in cold‐water specialists and a stable share of generalists suggested the maintenance of a certain level of specialization in the assemblages of brooks. The most marked change in the assemblage was associated with the impaired or bad water quality of rivers in the 1950s, which persisted or further deteriorated in the ensuing decades. Assemblages that were influenced by a slight deterioration or improvement in water quality were less altered, unless affected by other pressures (such as channel or discharge modifications). The results indicate that the causes of changes in the assemblages are many and complex, although heavy pollution overrides other influences. Direct habitat loss or their degradation by siltation appear to be leading contributors to changes in assemblages. The results imply the need for the application of a catchment‐scale perspective for the restoration of streams and the conservation of the remaining well‐preserved stretches of lowland rivers. Copyright © 2014 John Wiley & Sons, Ltd.

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Angewandte Limnologie

Schwoerbel

Brendelberger

2022

Einführung in Die Limnologie

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Cited by 16 publications

References 13 publications

Long-Term Variability in Bioassessments: A Twenty-Year Study from Two Northern California Streams

Long-Term Variability in Bioassessments: A Twenty-Year Study from Two Northern California Streams

Mayflies (Ephemeroptera) as indicators of environmental changes in the past five decades: a case study from the Morava and Odra River Basins (Czech Republic)

Angewandte Limnologie

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