Climate warming and agricultural stressors interact to determine stream periphyton community composition

2014 ◽  
Vol 21 (1) ◽  
pp. 206-222 ◽  
Author(s):  
Jeremy J. Piggott ◽  
Romana K. Salis ◽  
Gavin Lear ◽  
Colin R. Townsend ◽  
Christoph D. Matthaei
Keyword(s):  
Community Composition ◽  
Climate Warming ◽  
Periphyton Community ◽  
Stream Periphyton

scholarly journals Changes in Community Composition Induced by Experimental Warming in an Alpine Meadow: Beyond Plant Functional Type

2021 ◽  
Vol 9 ◽  
Author(s):  
Xiaoli Hu ◽  
Wenlong Zhou ◽  
Xiaonuo Li ◽  
Karl J. Niklas ◽  
Shucun Sun
Keyword(s):  
Community Composition ◽  
Relative Abundance ◽  
Climate Warming ◽  
Alpine Meadow ◽  
Growing Season ◽  
Species Level ◽  
Mean Annual Temperature ◽  
Functional Type ◽  
Species Identity ◽  
Induced Changes

Climate warming exerts profound effects on plant community composition. However, responses to climate warming are often reported at the community and functional type levels, but not at the species level. To test whether warming-induced changes are consistent among community, functional type, and species levels, we examined the warming-induced changes at different levels in an alpine meadow from 2015 to 2018. The warming was achieved by deploying six (open top) chambers [including three non-warmed chambers and three warmed chambers; 15 × 15 × 2.5 m (height) for each] that resulted in a small increase in mean annual temperature (0.3–0.5°C, varying with years) with a higher increase during the non-growing season (0.4–0.6°C) than in the growing season (0.03–0.47°C). The results show that warming increased plant aboveground biomass but did not change species richness, or Shannon diversity and evenness at the community level. At the functional type level, warming increased the relative abundance of grasses from 3 to 16%, but decreased the relative abundance of forbs from 89 to 79%; relative abundances of sedges and legumes were unchanged. However, for a given functional type, warming could result in contrasting effects on the relative abundance among species, e.g., the abundances of the forb species Geranium pylzowianum, Potentilla anserine, Euphrasia pectinate, and the sedge species Carex atrofusca increased in the warmed (compared to the non-warmed) chambers. More importantly, the difference in species identity between warmed and non-warmed chambers revealed warming-induced species loss. Specifically, four forb species were lost in both types of chambers, one additional forb species (Angelica apaensis) was lost in the non-warmed chambers, and two additional species (one forb species Saussurea stella and one sedge species Blysmus sinocompressus) were lost in the warmed chambers. Consequently, changes at the species level could not be deduced from the results at the community or functional type levels. These data indicate that species-level responses to climate changes must be more intensively studied. This work also highlights the importance of examining species identity (and not only species number) to study changes of community composition in response to climate warming.

scholarly journals Do changes in temperature affect EU Water Framework Directive compliant assessment results of central European streams?

2020 ◽  
Vol 32 (1) ◽  
Author(s):  
Phillip J. Haubrock ◽  
Francesca Pilotto ◽  
Peter Haase
Keyword(s):  
Community Composition ◽  
Climate Warming ◽  
Benthic Invertebrate ◽  
Freshwater Ecosystems ◽  
Stream Assessment ◽  
Central European ◽  
Invertebrate Communities ◽  
Assessment Metrics ◽  
Benthic Invertebrate Communities ◽  
Assessment Results

Abstract Background Benthic invertebrate communities are an integral and longstanding component of stream biomonitoring. However, multiple stressors driven by global change threaten benthic invertebrate communities. In particular, climate warming is expected to disrupt freshwater ecosystems. While an increasing number of studies have shown changes in benthic invertebrate community composition in response to climate warming, the effect on stream assessments has rarely been investigated. As several community composition metrics are also used in stream assessments, we predicted that climate warming would worsen stream assessment results. Therefore, we used a comprehensive data set of 2865 benthic invertebrate samples taken between 2000 and 2014 from small central European low mountain streams. We examined the effects of changes in temperature on common community and stream assessment metrics. We used 31 metrics covering composition, richness, tolerance and function of communities, of which many are used in various stream assessment schemes. Results Against our expectations, we identified a decreasing air temperature trend of − 0.18 °C over 15 years. This trend was accompanied by significant changes in community composition, for example, increases in species richness and decreases in the community temperature index (CTI). Further, we identified slight concomitant improvements of various globally used stream quality assessment metrics, such as a decreasing saprobic index and an increasing BMWP. Conclusions While temperature increased by + 0.9 °C during the past 30 years (1985–2014), our 15-year study period (2000–2014) showed a decrease by − 0.18 °C. Therefore, we regard the concomitant improvement in several assessment metrics as a recovery from prior increasing temperatures. In turn, we assume that increases in water temperature will lead to opposite effects and therefore cause declining assessment results. Water managers should be aware of this linkage that in turn could provide a chance to mitigate the effects of global warming by, for example, planting trees along the rivers and the removal of artificial barriers to increase current velocity to minimize a warming effect.

Changes in plant community composition lag behind climate warming in lowland forests

Nature ◽  
2011 ◽  
Vol 479 (7374) ◽  
pp. 517-520 ◽  
Author(s):  
Romain Bertrand ◽  
Jonathan Lenoir ◽  
Christian Piedallu ◽  
Gabriela Riofrío-Dillon ◽  
Patrice de Ruffray ◽  
...  
Keyword(s):  
Community Composition ◽  
Plant Community ◽  
Climate Warming ◽  
Plant Community Composition ◽  
Lowland Forests

Patterns of boreal permafrost peatland vegetation across environmental gradients sensitive to climate warming

1999 ◽  
Vol 77 (5) ◽  
pp. 721-733 ◽  
Author(s):  
Philip Camill
Keyword(s):  
Species Composition ◽  
Community Composition ◽  
Climate Warming ◽  
Functional Group ◽  
Environmental Gradients ◽  
Basal Area ◽  
Temperature And Precipitation ◽  
Feather Mosses ◽  
Water Ph ◽  
Ecosystem Level

This study documents changes in community and functional group across environmental gradients sensitive to climate warming in boreal permafrost peatlands and describes how future changes in temperature and precipitation may lead to changes in species composition and ecosystem properties. At the landscape scale, the presence of permafrost strongly influenced species composition. The position of permafrost thaw affected surface water pH and species composition. At local scales, a combination of water table depth and vegetation structure strongly controlled community composition. Permafrost plateau plots with high Picea mariana basal area were characterized by darker and drier understorey conditions, low cover of Sphagnum fuscum, Ledum groenlandicum, and lichen, and high cover of feather mosses. Aquatic collapse scar plots were dominated by aquatic Sphagnum and Carex, whereas more xeric plots were dominated by hummock Sphagnum and ericaceous shrubs. Functional group responses indicated that changing environmental conditions with climate warming may have significant impacts on community composition and ecosystem processes. A decomposition example is presented to show how changes in species and functional group composition could have important implications for ecosystem-level processes like peat accumulation during climate warming.Key words: bogs, fens, boreal, permafrost, vegetation, ordination

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