Relationships between environmental variables and groundwater biodiversity at the regional scale

Dole‐Olivier, Marie‐José; Malard, Florian; Martin, Dominique; Lefébure, Tristan; Gibert, Janine

doi:10.1111/j.1365-2427.2009.02184.x

Cited by 76 publications

(64 citation statements)

References 54 publications

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“…Humphreys 1999) and subsequent work in the Yilgarn has shown calcrete to be the most important habitat for stygofauna in that region (Humphreys 2001b;Cooper et al 2002). Projects such as PASCALIS in Europe have shown karst and alluvium to be the main stygofauna geologies (Dole-Olivier et al 2009) and, despite the survey results, it is likely that these are also the most productive geologies in most of the Pilbara.…”

Section: Factors Affecting Stygofauna Occurrencementioning

confidence: 93%

“…While this was considered to be largely a result of low sampling effi ciency resulting in ostracods not being collected from many sites where they actually occurred (see Eberhard et al 2009), several other studies have also found that water chemistry has little effect on stygofauna occurrence (e.g. Hahn 2006;Dole-Olivier et al 2009), despite the expectation that divalent cation and bicarbonate/ carbonate levels should be important for ostracods (Forester and Brouwers 1985;Gouramanis and De Deckker 2010) and perhaps other crustaceans (Glazier 1991). Little effect of water chemistry (other than salinity) was observed in the current analyses of the survey data.…”

Section: Factors Affecting Stygofauna Occurrencementioning

confidence: 99%

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Pilbara stygofauna: deep groundwater of an arid landscape contains globally significant radiation of biodiversity

Halse¹,

Scanlon²,

Cocking³

et al. 2014

Rec West Aust Mus Sup

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-The Pilbara region was surveyed for stygofauna between 2002 and 2005 with the aims of setting nature conservation priorities in relation to stygofauna, improving the understanding of factors affecting invertebrate stygofauna distribution and sampling yields, and providing a framework for assessing stygofauna species and community signifi cance in the environmental impact assessment process.Approximately 350 species of stygofauna were collected during the survey and extrapolation suggests that 500-550 actually occur in the Pilbara, although taxonomic resolution among some groups of stygofauna is poor and species richness is likely to have been substantially underestimated. More than 50 species were found in a single bore. Even though species richness was underestimated, it is clear that the Pilbara is a globally important region for stygofauna, supporting species densities greater than anywhere other than the Dinaric karst of Europe. This is in part because of a remarkable radiation of candonid ostracods in the Pilbara. Ostracods are the dominant stygofaunal group in terms of both species richness and animal abundance. Together, ostracods, copepods, amphipods and oligochates comprised 77% of species and 96% of animals collected.Stygofauna were found in 72% of samples collected and 81% of wells sampled. The average sample (including those without stygofauna) contained 3.2 ± 0.1 species. A feature of the Pilbara is that stygofauna occur across most of the landscape, often where the depth to groundwater is considerable, although yields were low where depth to groundwater was >30 m. Another feature is high endemicity: on the basis of current taxonomy 98% of the stygobites and 83% of the other groundwater species occur only within the region. Few factors affecting stygofauna occurrence could be identifi ed, however. Numbers of specimens and species collected were positively related to well diameter and negatively related to depth to groundwater. Numbers of species declined in inland sub-regions, although variability within sub-regions was high.While a range of freshwater chemistries occurred, 79% of water samples were weakly saline and NaCl dominated. Profi ling and purging of wells suggested that water quality measurements refl ected aquifer conditions in most situations. Water chemistry appeared to have limited infl uence on stygofauna occurrence in the Pilbara. Geology also appeared to have little effect on stygofauna occurrence but this may have been the result of non-random siting of wells; there was a bias towards wells being in transmissive locations that were not necessarily typical of the geology in which each well occurred.No potential reserves for stygofauna are recommended in this paper but nine areas of high stygofauna richness were identifi ed, including the listed Ethel Gorge stygofauna community. Theoretical analysis of species ranges suggested that half of the species found only in the vicinity of development projects will have ranges less than 680 km 2 . Consequently, projects involving ext...

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Section: Factors Affecting Stygofauna Occurrencementioning

confidence: 93%

Section: Factors Affecting Stygofauna Occurrencementioning

confidence: 99%

Pilbara stygofauna: deep groundwater of an arid landscape contains globally significant radiation of biodiversity

Halse¹,

Scanlon²,

Cocking³

et al. 2014

Rec West Aust Mus Sup

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“…In the last decade, regional assessment of hypogean biodiversity using a hierarchical approach was carried out across Europe that also made a comparison of species richness between the vadose and phreatic zone of the same karstic aquifers possible (PASCALIS project;Dole-Olivier et al, 2009b;Galassi et al, 2009b;Stoch et al, 2009). At a regional scale, historical variables (glaciations and the age of geological formations), altitude and geology (pore size) primarily determined the hypogean community composition and species richness (Dole-Olivier et al, 2009a). A comparison of the vadose and phreatic zones revealed higher regional species richness in the former (Dole-Olivier et al, 2009b;Galassi et al, 2009b;Galassi et al, 2013), most probably due to higher habitat heterogeneity and habitat fragmentation.…”

Section: Study Sitementioning

confidence: 99%

Differences in aquatic microcrustacean assemblages between temporary and perennial springs of an alpine karstic aquifer

Mori¹,

Brancelj²,

Machel³

2013

IJS

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Microcrustacean (Copepoda, Ostracoda) assemblages were investigated at the interface of the vadose and phreatic zones in the alpine karstic aquifer from the Julian Alps in Slovenia (SE Europe). Two temporary and one perennial karstic outlets were sampled by filtering the water several times over 2 years. Concurrently, benthos from the mouth of a perennial spring and from an adjacent spring brook were collected. Altogether 24 microcrustacean species were recorded. The spatial and temporal variation in drift densities and species composition was high indicating complex groundwater hydrological pathways being dependent on precipitation regime. Non-metric Multidimensional Scaling (NMDS) clearly separated drift samples from temporary springs and other sample groups (drift in perennial spring, spring mouth and spring brook benthos). ANOSIM revealed statistically significant differences between all sample groups (Diacyclops zschokkei, Elaphoidella phreatica and Mixtacandona sp. B contributed over 50 % to the observed differences among sample groups. Three species (Nitocrella sp., Speocyclops infernus, Lessinocamptus pivai), known to be typical epikarst species, were collected only in the drift from one temporary spring (T2). Mao Tau species accumulation curves did not reach asymptote for the drift from temporary springs, but did for the drift from perennial spring, and for the spring mouth and the spring brook benthos. The results on drift composition indicated the variation in the origin of the water discharging at the interface of vadoze and phreatic zones depending greatly on water level conditions, while the drift densities were higher in the water presumably discharging from phreatic zone (perennial spring and temporary springs during low water levels)

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“…Larvae of Chironomidae live in different habitats without selecting the available resources, minimising intraspecific and interspecific interactions (Dole-Olivier et al, 2009) so they are strongly influenced by variations in the physical and trophic microhabitats. The spatial segregation between different species in habitats can lead to spatial overlap, determining a trend for spatial intraspecific competitive interactions (Schmid-Arraya and Schmid, 1995).…”

Section: Introductionmentioning

confidence: 99%

Chironomidae larvae (Diptera) of Neotropical floodplain: overlap niche in different habitats

Butakka¹,

Ragonha

Takeda

2014

Braz. J. Biol.

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The niche overlap between trophic groups of Chironomidae larvae in different habitats was observed between trophic groups and between different environments in Neotropical floodplain. For the evaluation we used the index of niche overlap (C XY ) and analysis of trophic networks, both from the types and amount of food items identified in the larval alimentary canal. In all environments, the larvae fed on mainly organic matter such as plants fragments and algae, but there were many omnivore larvae. Species that have high values of food items occurred in diverse environments as generalists with great overlap niche and those with a low amount of food items with less overlap niche were classified as specialists. The largest number of trophic niche overlap was observed among collector-gatherers in connected floodplain lakes. The lower values of index niche overlap were predators. The similarity in the diet of different taxa in the same niche does not necessarily imply competition between them, but coexistence when the food resource is not scarce in the environment even in partially overlapping niches.Keywords: aquatic invertebrate, food recourses, food webs, lakes, Upper Paraná River.Larvas de Chironomidae (Diptera) de uma planície de inundação neotropical: sobreposição de nichos em diferentes habitats ResumoA sobreposição de nichos entre grupos tróficos de larvas de Chironomidae em diferentes tipos de ambientes foi verificada entre os grupos tróficos e entre diferentes ambientes em uma planície de inundação Neotropical. Para a avaliação foi utilizado o Índice de Sobreposição de Nicho (C XY ) e análises de redes tróficas, ambos a partir dos tipos e quantidade de itens alimentares identificados no tubo digestivo das larvas. As larvas alimentaram-se em todos os ambientes principalmente de detritos orgânicos como os fragmentos de plantas e algas, porém, verificou-se alto nível de omnívora. As espécies que tem altos valores de itens alimentares ocorreram em diversos ambientes como generalistas e com grande sobreposição de nichos e aqueles com baixos itens alimentares e com menor sobreposição foram classificados como especialistas. O maior número de sobreposição de nichos tróficos foi verificado em coletores-catadores nas lagoas com conexão. Os menores valores do índice foram verificados nos predadores. A semelhança na dieta de diferentes táxons e grupos tróficos em um mesmo nicho não implica, necessariamente, uma competição entre eles, porém uma coexistência quando o recurso alimentar não é escasso no ambiente, mesmo com sobreposição parcial de nichos.Palavras-chave: invertebrados aquáticos, recursos alimentares, rede trófica, lagoas, Alto rio Paraná.

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Relationships between environmental variables and groundwater biodiversity at the regional scale

Cited by 76 publications

References 54 publications

Pilbara stygofauna: deep groundwater of an arid landscape contains globally significant radiation of biodiversity

Pilbara stygofauna: deep groundwater of an arid landscape contains globally significant radiation of biodiversity

Differences in aquatic microcrustacean assemblages between temporary and perennial springs of an alpine karstic aquifer

Chironomidae larvae (Diptera) of Neotropical floodplain: overlap niche in different habitats

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