Fringing trees may provide a refuge from prolonged drying for urban wetland invertebrates

Strachan, Scott R.; Chester, Edwin T.; Robson, Belinda J.

doi:10.1007/s11252-016-0548-y

Cited by 11 publications

(16 citation statements)

References 32 publications

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“…in a dry lake) or prevent many invertebrates from completing their life cycle (e.g. species with delayed hatching, Eskinazi‐Sant’Anna & Pace, 2018; Strachan et al, 2016b; Tronstad et al, 2005). Theoretical research by Botero et al (2015) indicates that such large changes in environmental conditions (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…an aquatic environment becoming terrestrial with increasing frequency) will exceed the capacity for evolutionary adaptation. Although remarkably flexible, the desiccation survival mechanisms used by aquatic invertebrates in seasonal lakes in southwestern Australia would not perform well with either very short or no hydroperiod (Strachan et al, 2014(Strachan et al, , 2016a(Strachan et al, , 2016b. One mechanism that many species rely on to survive the absence of surface water, desiccation-resistant eggs, is highly effective for surviving dry periods of <5-10 years but shows marked decline over longer dry periods in field studies (Eskinazi-Sant'Anna & Pace, 2018;Jenkins & Boulton, 2007).…”

Section: Losses In γ Diversity Were Associated With Dryingmentioning

confidence: 99%

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Substantial long‐term loss of alpha and gamma diversity of lake invertebrates in a landscape exposed to a drying climate

Atkinson

Cale²,

Pinder³

et al. 2021

Global Change Biology

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Many regions across the globe are shifting to more arid climates. For shallow lakes, decreasing rainfall volume and timing, changing regional wind patterns and increased evaporation rates alter water regimes so that dry periods occur more frequently and for longer. Drier conditions may affect fauna directly and indirectly through altered physicochemical conditions in lakes. Although many studies have predicted negative effects of such changes on aquatic biodiversity, empirical studies demonstrating these effects are rare. Global warming has caused severe climatic drying in southwestern Australia since the 1970s, so we aimed to determine whether lakes in this region showed impacts on lake hydroperiod, water quality, and α, β and γ diversity of lake invertebrates from 1998 to 2011. Seventeen lakes across a range of salinities were sampled biennially in spring in the Wheatbelt and Great Southern regions of Western Australia. Multivariate analyses were used to identify changes in α, β and γ diversity and examine patterns in physicochemical data. Salinity and average rainfall partially explained patterns in invertebrate richness and assemblage composition. Climatic drying was associated with significant declines in lake depth, increased frequency of dry periods, and reduced α and γ diversity (γ declined from ~300 to ~100 taxa from 1998 to 2011 in the 17 wetlands). In contrast, β diversity remained consistently high, because each lake retained a distinct fauna. Mean α diversity per-lake declined both in lakes that dried and lakes that did not dry out, but lakes which retained a greater proportion of their maximum depth retained more α diversity. Accumulated losses in α diversity caused the decline in γ diversity likely through shrinking habitat area, fewer stepping stones for dispersal and loss of specific habitat types. Biodiversity loss is thus likely from lakes in drying regions globally. Management actions will need to sustain water depth in lakes to prevent biodiversity loss.

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Section: Discussionmentioning

confidence: 99%

Section: Losses In γ Diversity Were Associated With Dryingmentioning

confidence: 99%

Substantial long‐term loss of alpha and gamma diversity of lake invertebrates in a landscape exposed to a drying climate

Atkinson

Cale²,

Pinder³

et al. 2021

Global Change Biology

Self Cite

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show abstract

“…Across the coastline, interdunal wetlands varied in organic material (macrophytes) accretion and open porous sandy benthos (field observation). This could differentially influence dry‐down when lake levels drop, with wetlands dominated by decaying organic material retaining water longer and supporting a subset of species that preferentially colonise more stable wetlands with increased microhabitat (Strachan et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

Local environmental conditions influence species replacement in Great Lakes interdunal wetland macroinvertebrate communities

Stewart

Schriever

2022

Freshwater Biology

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Understanding the role of environmental filtering and spatial processes along environmental gradients in assembling and maintaining aquatic communities in rare habitats is crucial for land management and biological conservation. We investigated the relative roles of environmental and spatial factors influencing beta (β) diversity of aquatic macroinvertebrate assemblages in 36 interdunal wetlands from five freshwater sand dune areas across two ecoregions spanning the latitudinal gradient of Lake Michigan. We hypothesised that aquatic macroinvertebrate diversity and composition would vary along the coastline because of an underlying environmental gradient. We predicted high species replacement correlated with environmental (local and regional) conditions and increasing species diversity with decreasing latitude. We calculated sample completeness, obtained diversity estimates based on Hill numbers and used abundance‐based β partitioning and multivariate analysis to examine β diversity, and its replacement and nestedness components in relation to local and regional predictors. Despite a short latitudinal gradient, we detected a significant increase in species richness with decreasing latitude, underpinned by a strong temperature and precipitation gradient. Species replacement (balanced variation in abundance) was high at all spatial scales (wetland, dune area, ecoregion and coastline), and correlated with local and regional environmental variables. Community dissimilarity showed no marked increase with spatial extent, which suggests a system where local‐scale environmental filtering prevents dispersal driven homogenisation. Both local and bioclimatic factors were correlated with aquatic macroinvertebrate dissimilarity, but local factors played a larger role. This study simultaneously examined the response of alpha and β diversity to geographical and environmental variables. Our results indicate that macroinvertebrates respond to abiotic factors by tracking suitable environmental conditions among locally variable interdunal wetlands. Thus, high dispersal along the coastline conveys resiliency to a hydrologically dynamic wetland system, which allows aquatic macroinvertebrates to contribute an integral portion of sand dune biodiversity within the Laurentian Great Lakes region. The high species turnover found suggests that conservation strategies should consider coastline connectivity among dune areas to maintain freshwater biodiversity.

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“…It is also possible that, because some species require special conditions, or special incubation periods to hatch (Vandekerkhove, Declerck, Brendonck, Conde‐Porcuna, Jeppesen, & de Meester, 2005), their resting forms could not hatch in the particular experimental setting and therefore those species were not detected in the experiment. Differences in microhabitat heterogeneity, either when collecting the sediment or when sampling the active metacommunity may also be partially responsible for the observed differences in species composition (Strachan et al, 2016a). Nevertheless, overall the two metacommunities were significantly correlated (according to our Procrustes analysis), supporting the use of hatching experiments to show general patterns of species composition in temporary habitats.…”

Section: Discussionmentioning

confidence: 99%

An evaluation of crustacean and rotifer diversity and composition in a temporary pond metacommunity: Comparing results from field samples and a hatching experiment

et al. 2022

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Many aquatic invertebrates that inhabit temporary ponds produce resting forms to overcome the dry period, building up the egg bank. When the wet phase returns, the resting forms hatch and the community is restored, and then pioneer species may have a major influence on how the pond community will assemble. We aimed to evaluate the diversity of an initial pond metacommunity by comparing the early active metacommunity collected in the field and the egg bank metacommunity (by carrying out a hatching experiment) of 32 Mediterranean temporary ponds. We hypothesised that both metacommunities would be similar but also that species turnover may play an important role, and that γ diversity would be similar with both approaches. After the identification and counting of rotifers and crustaceans in both metacommunities (i.e. the field vs. the experiment) we performed a Partial Triadic Analysis comparing the field metacommunity with those corresponding to each of the eight times the hatching experiment was checked for hatchlings. Furthermore, we compared the field and experimental metacommunities with a PROTEST analysis and identified the taxa responsible for differences between metacommunities with a SIMPER analysis. We assessed γ diversity using a size‐based rarefaction curve and an evenness profile and explored β diversity and its components (turnover and nestedness) for the two metacommunities. Our experimental results showed differences in the temporal pattern of emergence between groups of organisms, with copepods, rotifers, and anostracans appearing first, but ostracods and rotifers reaching the highest diversity at the end of the experiment. The active and experimental pioneer metacommunities were similar according to a Procrustes analysis. Nevertheless, β diversity was high in both metacommunities and the differences among ponds and between both assemblages were mostly explained by species turnover. Both the active and experimental pond metacommunities showed some exclusive species that may be more difficult to uncover with only one type of approach. Furthermore, the high β diversity observed indicates that each temporary pond is an important contributor to γ diversity in the metacommunity. These results show that hatching experiments provide information that is complementary to standard sampling of the active community, and consequently is a useful tool to uncover pond biodiversity.

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Fringing trees may provide a refuge from prolonged drying for urban wetland invertebrates

Cited by 11 publications

References 32 publications

Substantial long‐term loss of alpha and gamma diversity of lake invertebrates in a landscape exposed to a drying climate

Substantial long‐term loss of alpha and gamma diversity of lake invertebrates in a landscape exposed to a drying climate

Local environmental conditions influence species replacement in Great Lakes interdunal wetland macroinvertebrate communities

An evaluation of crustacean and rotifer diversity and composition in a temporary pond metacommunity: Comparing results from field samples and a hatching experiment

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