The conservation of brackish-water systems: priorities for the 21st century

Barnes, R. S. K.

doi:10.1002/(sici)1099-0755(199911/12)9:6<523::aid-aqc368>3.0.co;2-a

Cited by 15 publications

(12 citation statements)

References 11 publications

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“…Large temporal and spatial variations in salinity due to the irregular mixing of fresh and saline water, has long been hypothesized as the reason for species poverty in coastal brackish-water systems. Besides this environmental hostility hypothesis other explanations are also possible (Barnes, 1999).…”

Section: Introductionmentioning

confidence: 99%

“…Major gaps still remain in aquatic conservation knowledge about lagoons and other coastal brackish water habitats in temperate regions, and much more emphasis is needed on the investigation of the ecology of such systems to ensure their effective management (Barnes, 1999). Information about the relative biodiversity value of different waterbody types is a vital pre-requisite for many strategic conservation goals (Williams et al, 2003), including sustainable catchment management as required by the EC Water Framework Directive (2000/60/EC).…”

Section: Introductionmentioning

confidence: 99%

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Aquatic Coleoptera and Hemiptera assemblages in three coastal lagoons of the NW Iberian Peninsula: assessment of conservation value and response to environmental factors

Garrido

Munilla

2007

Aquatic Conservation

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ABSTRACT1. The objectives of the present study were to describe and analyse the composition and structure of aquatic Coleoptera and Hemiptera assemblages in three coastal lagoons of north-western Spain during a one year cycle, in order to evaluate their relative adequacy to provide information about the conservation value of lagoonal habitats and sites. The lagoons are designated as Special Areas of Conservation (SAC) under the European Union Habitats Directive and two of them are also protected by the Ramsar Agreement. Several abiotic variables, including salinity, were recorded at the time of sampling.2. In total, 67 species (52 Coleoptera and 15 Hemiptera) and 6568 adult individuals (2664 Coleoptera and 3904 Hemiptera) were collected. In all pair-wise comparisons Kendall's coefficients of concordance between lagoons were higher for Hemiptera than for Coleoptera, indicating that Hemiptera assemblages were more similar across sites.3. Most species recorded had a wide Palearctic distribution and only three species of water beetles could be considered endemic to Iberia: Hydroporus vagepictus, Hydroporus vespertinus and Hydrochus angusi. Similarly, the species collected had a widespread distribution in the Iberian Peninsula as the only species considered to be rare taxa at this scale were Hydrochus angusi and Cymbiodyta marginella among the Coleoptera and Sigara scotti and Notonecta glauca glauca among the Hemiptera.4. The results do not support the idea of distinct aquatic insect assemblages for coastal lagoons in the Iberian Peninsula. Comparisons of the numbers of interior (non-coastal) and coastal provinces of the Iberian Peninsula where the species had been recorded showed they had been recorded in a larger proportion of interior provinces.5. Salinity seemed to reduce species richness in both groups while the results of a canonical correspondence analysis (CCA) showed that the majority of species responded negatively to salinity.6. This study suggests that species richness and rarity of aquatic insect assemblages may underestimate the conservation value of lagoonal habitats because their net contribution to catchment biodiversity is likely to be low.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Aquatic Coleoptera and Hemiptera assemblages in three coastal lagoons of the NW Iberian Peninsula: assessment of conservation value and response to environmental factors

Garrido

Munilla

2007

Aquatic Conservation

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“…This concept suggests that salinity may set the extreme boundaries for such species, but that community structure including competition, predation, herbivory, allelopathy, and others may determine the colonization ability of any given species. Barnes (1999) states that there is evidence that brackish water communities are not physically structured by salinity, but by biotic processes such as predation and competition. Although it is tempting to suggest that C. evoluta's apparent absence from continental eastern North America is due to the absence of any significant saline waters, this may be an oversimplification.…”

Section: Distribution and Ecologymentioning

confidence: 99%

Charophytes of Insular Newfoundland II: <em>Chara evoluta</em> and <em>Chara canescens</em>

Mann

Nambudiri

2005

Can Field Nat

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The rare Newfoundland disjuncts Chara evoluta and Chara canescens are compared morphologically, ecologically, and geographically. Although very similar morphologically, they can readily be distinguished by their monoecious/dioecious nature, cortical cell features and coronula size. Ecological differences are more subtle and difficult to quantify. In Newfoundland the two species are restricted to coastal saline lagoons in the southwest region of the Island, with C. evoluta exhibiting an association with Chara aspera. The flora and fauna of these unique habitats are poorly documented even though it is known that they are associated with other rare species including the Piping Plover and the Banded Killifish. Consideration of some degree of protection as special habitats within the provincial ecological reserve strategy is suggested. An updated key to all species of charophytes known to inhabit Newfoundland and Labrador is included, and a brief overview of their ecological distributions is provided.

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“…Major gaps still remain in aquatic conservation knowledge of lagoons and other coastal brackish water habitats in temperate regions, and much more emphasis needs to be placed on the investigation of the ecology of such systems to ensure their effective management (Barnes, 1999). Information about the relative biodiversity value of different water body types is a vital pre-requisite for many strategic conservation goals (Williams et al, 2003), including sustainable catchment management as required by the EC Water Framework Directive (2000/60/EC).…”

Section: Introductionmentioning

confidence: 99%