Determining vulnerability of stream communities to climate change at the landscape scale

Буш, А. А.; Nipperess, David A.; Turak, Eren; Hughes, Lesley

doi:10.1111/j.1365-2427.2012.02835.x

Cited by 30 publications

(27 citation statements)

References 54 publications

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“…Range shifts have already been shown for freshwater species (e.g., Vittoz et al, 2013). However, adaptation via range shifts is constrained by catchment boundaries and the dispersal capabilities of the single species (Bush et al, 2012). We conclude that an upwards migration of spring species in the Alps will potentially be possible for species in low altitudinal springs.…”

Section: Discussionsupporting

confidence: 50%

“…Another reason for the absence of G. fossarum may be found in the last glaciation: the central Alps still have to be recolonized by amphipods (Cantonati et al, 2006). Studies predict that montane regions will be affected more strongly by climatic changes than the lowlands (e.g., Bush et al, 2012;Perroud and Bader, 2013;CH2014-Impacts, 2014. Range shifts have already been shown for freshwater species (e.g., Vittoz et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

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Macroinvertebrate assemblages of natural springs along an altitudinal gradient in the Bernese Alps, Switzerland

Wigger

Schmidlin

Nagel

et al. 2015

Ann. Limnol. - Int. J. Lim.

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-Alpine springs are sensitive ecotones which are inhabited by highly adapted organisms. Studies on how the species assemblages change vertically have not been conducted previously. We investigated 35 natural springs along an altitudinal gradient of about 2000 m in a valley in the Bernese Alps over 2 years. The aim of this study was to investigate the changes of the macroinvertebrate assemblages of natural springs along this gradient and to find out which environmental factors determine the distribution of the species along the altitudinal gradient. The spring fauna was quantitatively sampled three times and a wide range of environmental parameters were measured. The species richness significantly decreased with increasing altitude and the composition of the species assemblages changed distinctively along the altitudinal gradient. The low-elevation springs were dominated by crenobiont species, whereas high-altitude springs were mostly inhabited by taxa typical for Alpine headwaters in general. The mid-altitudinal range was a transition zone where crenobiont and alpine species co-existed. The water temperature was an important factor determining the species richness and the composition of macroinvertebrate assemblages of the springs at different altitudes. Moss, stones and the degree of forestation also had a significant influence on the composition of the macroinvertebrate assemblages. This study helps to understand the distribution of the spring fauna along altitudinal gradients. Knowing the current distribution ranges is an important prerequisite to predict potential changes of the species distribution, caused by global change, in the future.

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Section: Discussionsupporting

confidence: 50%

Section: Discussionmentioning

confidence: 99%

Macroinvertebrate assemblages of natural springs along an altitudinal gradient in the Bernese Alps, Switzerland

Wigger

Schmidlin

Nagel

et al. 2015

Ann. Limnol. - Int. J. Lim.

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“…Similarly, Bush et al . () found that macroinvertebrate assemblages in Australian montane streams were vulnerable to climate change because of the isolated nature of upper reaches and associated climatic variation, while assemblages in coastal streams demonstrated turnover with distance. Comparisons of variance explained among studies are somewhat difficult because of the differing, often complex approaches employed by different studies (e.g.…”

Section: Discussionmentioning

confidence: 99%

Habitat type and dispersal ability influence spatial structuring of larval Odonata and Trichoptera assemblages

Curry

Baird

2015

Freshwater Biology

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1. Freshwater invertebrate assemblages are believed to be structured by both local and larger scale processes (i.e. dispersal). In rivers, the extent to which dispersal processes influence local assemblage composition may depend on both the taxon and habitat in question. Poor dispersers should display greater spatial structuring than strong dispersers. Likewise, assemblages in poorly connected habitats should experience greater dispersal limitation, and therefore greater spatial structuring. 2. We sought to test these hypotheses using two contrasting orders of aquatic insect, Odonata and Trichoptera. Odonata are believed to have greater dispersal capacity than Trichoptera. In river ecosystems, these orders inhabit both main channel habitats and more poorly connected riverine wetlands. Multi-habitat surveys of larval Trichoptera and Odonata assemblages were conducted at 34 sites in three 5th-order New Brunswick rivers. The degree of spatial and environmental structuring in assemblages was assessed using redundancy analysis-based variance partitioning. We also assessed the performance of different model-based spatial predictors (asymmetric eigenvector maps, AEMs and principal coordinates of neighbourhood matrices, PCNMs). 3. For main channel areas, variance explained purely by environmental variables was greater for Odonata, while the purely spatial component of variance was greater for Trichoptera, regardless of the class of spatial descriptor. In riverine wetlands, both the purely environmental and purely spatial components of variance explained were similar or were greater for Trichoptera than for Odonata. 4. The component of variance explained by spatial variables was greater in riverine wetlands than main channel areas for both Odonata and Trichoptera for most spatial descriptors, suggesting that taxa inhabiting riverine wetlands may experience greater dispersal limitation. However, the magnitude of this difference was relatively small in most cases. Eigenvector-based spatial descriptors (PCNMs, AEMs, netPCNMs) explained more variance than traditional spatial descriptors. For Trichoptera, networkbased predictors (AEMs, netPCNMs) explained more variance than PCNMs in main channel areas. 5. Our results suggest that dispersal ability and habitat type can influence the degree of spatial structuring in aquatic insect assemblages. However, these patterns must be investigated across a wider range of insect groups and at larger spatial scales. Our results also suggest that biomonitoring programs should consider assemblage spatial structure in building reference condition models and that aquatic conservation planners must consider the type and spatial arrangement of habitats in reserve design. Eigenvector-based spatial descriptors hold promise for interpreting biodiversity patterns in freshwater invertebrates, but more work is required to relate patterns to actual dispersal behaviour.

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“…) and are expected to lead to significant shifts in assemblage composition (Chessman ; Bush et al . ). We chose to focus on Odonata (dragonflies and damselflies) because they are a diverse component of Australian freshwater biodiversity with a high proportion of endemic species (78%) (Theischinger & Endersby ) and they are likely to be highly responsive to climate change (Bush et al .…”

Section: Introductionmentioning

confidence: 97%

Freshwater conservation planning under climate change: demonstrating proactive approaches for Australian Odonata

Буш

Hermoso

Linke

et al. 2014

Journal of Applied Ecology

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Summary1. Climate change represents a major challenge for conservation in the future and undermines protection within reserve boundaries. Freshwater biodiversity is still under-represented within reserves world-wide, and connectivity among reserves will become increasingly crucial if species are to persist under climate change. 2. We tested the likely benefits of including predicted species distributions in systematic reserve design for rivers under climate change and the impact of varying connectivity requirements on future representation. 3. We used the modelled distribution of 126 east Australian Odonata to identify reserve networks using data for current or future (2055 and 2085) distributions either by filling gaps additively, or as separate targets in a single solution. We then assessed the potential improvements to species representation in the future using different types of connectivity penalties that emphasized either longitudinal riverine connections or connections to all neighbouring subcatchments. 4. Solutions that did not include future distributions in the planning stages were 16 to 30% less likely to protect the same species by 2055 and 2085, respectively. Inclusion of species' future distributions in the design phase leads to short-term increases in cost, but in the longer term fewer additional areas are required to meet targets and this strategy is likely to be significantly more efficient than implementing systematic design in stages. In addition, solely targeting riverine connectivity was significantly less likely to protect current species in the future than if cross-catchment connections were included. 5. Synthesis and applications. Where protected areas can be expanded to assist species adaptation to climate change, significant gains in efficiency are possible if longer term goals are considered when selecting sites. Furthermore, to improve the representation of species under future climates, reserve selection should consider inter-catchment connectivity, although the nature of optimal solutions will depend heavily on the range of taxa included, their dispersal capacity, and the availability of climatic refugia.

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Determining vulnerability of stream communities to climate change at the landscape scale

Cited by 30 publications

References 54 publications

Macroinvertebrate assemblages of natural springs along an altitudinal gradient in the Bernese Alps, Switzerland

Macroinvertebrate assemblages of natural springs along an altitudinal gradient in the Bernese Alps, Switzerland

Habitat type and dispersal ability influence spatial structuring of larval Odonata and Trichoptera assemblages

Freshwater conservation planning under climate change: demonstrating proactive approaches for Australian Odonata

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