The influence of changing hydroregime on the invertebrate communities of temporary seasonal wetlands

Sim, Lien; Davis, Jenny; Strehlow, K.; McGuire, Megan; Trayler, K.M.; Wild, Suzi; Papas, Phil J.; O'Connor, J. E.

doi:10.1899/12-024.1

Cited by 68 publications

(100 citation statements)

References 48 publications

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“…In this experiment, drying was relatively slow, taking 14 days. Thus, it is likely that higher temperatures and longer dry periods (exceeding 12 months in some documented cases, Sim et al (2013)), associated with climate change, groundwater extraction or loss of fringing trees, may also exceed these species' tolerances.…”

Section: Discussionmentioning

confidence: 99%

“…Salinity varies naturally among Swan Coastal Plain wetlands depending on their underlying groundwater, and it increases when water levels are low (Sim et al 2013). The salinity measured here arose from salts in the sediment being dissolved during experimental immersion, so salinity levels reflected salt deposition when sediments dried out in the field.…”

Section: Discussionmentioning

confidence: 99%

“…The least disturbed wetlands were Chelodina Swamp and South Lake, which are surrounded by remnant bushland. Additional detailed descriptions of these wetlands, their hydrology, ecology and biodiversity may be found in: Davis and Christidis (1999), Horwitz et al (2009) and Sim et al (2013).…”

Section: Study Areamentioning

confidence: 99%

“…When inundated, they provide habitat for a diverse range of waterbird, amphibian, reptile, fish and invertebrate species (Waterkeyn et al 2008). When dry, the absence of surface water means that animals must either leave the wetland (being resilient to drying, Sim et al 2013) or must rely on resistance traits to take refuge in wetland sediments (Strachan et al 2014). Dormancy may be used by some invertebrate species to survive in dry sediments, while others have desiccationresistant eggs (Boulton et al 2014;Strachan et al 2015).…”

Section: Introductionmentioning

confidence: 99%

“…A decrease in rainfall and runoff is also lowering the groundwater table (Boulton et al 2014), which is the principal supply of water to many wetlands. Along with regional groundwater extraction for water supply, these processes are reducing inundation periods in urban wetlands (Sim et al 2013). Connectivity to groundwater may cause patches of wetland sediment to remain damp (Strachan et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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

2016

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Climate change is causing prolonged drying in many seasonal wetlands, including urban wetlands, potentially affecting aquatic invertebrates that take refuge in wetland sediment during dry periods and thereby threatening wetland biodiversity. We collected sediment from two habitats: open water (OW) and fringing trees (FT), in eight urban wetlands after seasonal inundation had ended. Both habitats are inundated during winter-spring and dry in summer-autumn. Each sediment sample was divided into subsamples. One set of subsamples were inundated in the laboratory to test the hypothesis that emerging invertebrate assemblages would differ between OW and FT sediments. Another set of subsamples was dried, stored for a year, and inundated to test the hypothesis that prolonged drying would reduce the abundance and taxa richness of emerging invertebrates. The composition of emerging invertebrate assemblages differed between habitats, with more amphibious species found in FT sediment. Invertebrate responses to prolonged drying and storage varied among species: for some, effects depended on habitat type, while others delayed emergence or showed no response. Microcrustacean abundance was unaffected by drying, suggesting that their productivity during refilling may resist drier water regimes. Surface temperatures of dry sediment are cooler beneath FT, and this sediment has higher organic matter, holds more water and is less dense than OW sediment; and FT sediment remained cooler than OW sediment in the laboratory, despite the absence of shading. Fringing trees may therefore provide a refuge for some freshwater invertebrates relying on dormant stages in the sediment to survive drying in urban wetlands.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

2016

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Conservation of freshwater macroinvertebrate biodiversity in tropical regions

Sundar

Heino

Roque

et al. 2020

Aquatic Conservation

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Motivated by recent global initiatives for biodiversity conservation and restoration, this article reviews the gaps in our understanding of, and the challenges facing, freshwater macroinvertebrate biodiversity and conservation in tropical regions. This study revealed a lack of adequate taxonomic, phylogenetic, and ecological information for most macroinvertebrate groups, and consequently there are large‐scale knowledge gaps regarding the response of macroinvertebrate diversity to potential climate change and other human impacts in tropical regions. We propose ideas to reduce the impact of key drivers of declines in macroinvertebrate biodiversity, including habitat degradation and loss, hydrological alteration, overexploitation, invasive species, pollution, and the multiple impacts of climate change. The review also provides recommendations to enhance conservation planning in these systems (as well as providing clear management plans at local, regional, and national levels), integrated catchment management, the formulation of regulatory measures, the understanding of the determinants of macroinvertebrate diversity across multiple scales and taxonomic groups, and the collaboration between researchers and conservation professionals. It is suggested that the integrated use of macroinvertebrate biodiversity information in biomonitoring can improve ecosystem management. This goal can be facilitated in part by conservation psychology, marketing, and the use of the media and the Internet.

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Isotope hydrology to provide insights into the behaviour of temporary wetlands as a basis for developing sustainable ecohydrological management strategies in Mediterranean regions

et al. 2022

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The lack of hydrological considerations in the existing protection statutes for small temporary wetlands has recently been pointed out as the main cause of their rapidly increasing disappearance. In the present study, we aim to demonstrate the interest of using the tools of isotope hydrology to obtain a rapid and cost effective understanding of the hydrological connectivity of Mediterranean temporary wetlands in order to define the optimal environmental conditions needed to ensure their sustainability. By combining physical and isotope measurements, we have investigated the fragile balance of direct precipitation, subsurface water and groundwater influencing the hydroperiod of a typical Mediterranean temporary pond. The use of the water stable isotopes enabled us to demonstrate (i) the major role played by groundwater and subsurface water in the flooding phase of the temporary pond; (ii) the involvement of different water reservoirs in varying proportions over time to maintain the pond filled with water: precipitation, subsurface and groundwater by using d-excess; (iii) the main role played by evaporation in starting the drying up phase; and (iv) the connection existing between a geographically isolated wetland and the regional groundwater body. These results highlight the urgent need to consider both surface and groundwater fluxes in specific protection statutes for wetlands. To this end, we recommend the use of the water stable isotopes to provide insights into the hydrological behaviour of the wetlands in order to dispose of additional cost-effective arbitration arguments to help ensure their sustainability. The lack of hydrological considerations in existing protection statutes for small temporary wetlands has recently been pointed out as the main cause of their disappearance. Here, by combining physical and isotopes measurements, we first highlight the main role played by groundwater in the flooding phase of the temporary pond and the involvement of different water reservoirs in varying proportions over time to maintain the pond filled. These results demonstrate the connection existing between a geographically isolated wetland and the regional groundwater and highlight the urgent need to consider both surface and groundwater fluxes in specific protection statutes for wetlands.

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The influence of changing hydroregime on the invertebrate communities of temporary seasonal wetlands

Cited by 68 publications

References 48 publications

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

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

Conservation of freshwater macroinvertebrate biodiversity in tropical regions

Isotope hydrology to provide insights into the behaviour of temporary wetlands as a basis for developing sustainable ecohydrological management strategies in Mediterranean regions

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