Ajouter le résultat dans votre panier Affiner la recherche
Biodiversity and distribution patterns of freshwater invertebrates in farm ponds of a south-western French agricultural landscape / CEREGHINO, R. (2008)
Titre : Biodiversity and distribution patterns of freshwater invertebrates in farm ponds of a south-western French agricultural landscape Type de document : texte imprimé Auteurs : R. CEREGHINO ; A. RUGGIERO ; P. MARTY ; S. ANGELIBERT Année de publication : 2008 Article en page(s) : pp 43-51 Catégories : Ecoplanète
AGRICULTURE ; Artificial ponds ; macroinvertebrates ; SOM ; Wetlands
Résumé : We assessed the importance for biodiversity of man-made farm ponds in an agricultural landscape in SW France lacking natural wetlands. The ponds were originally created to provide a variety of societal services (irrigation, visual amenity, water for cattle, etc.). We also assessed the environmental factors influencing invertebrate assemblages in these ponds. Only 18 invertebrate taxa out of 114 taxa occurring in the study area were common to ponds and rivers indicating that the contribution of farm ponds to freshwater biodiversity was potentially high. A Self-Organizing Map (SOM, neural network) was used to classify 36 farm ponds in terms of the 52 invertebrate families and genera they supported, and to specify the influence of environmental variables related to land-use and to pond characteristics on the assemblage patterns. The SOM trained with taxa occurrences showed five clusters of ponds, most taxa occurring only in 1-2 clusters of ponds. Abandoned ponds tended to support higher numbers of taxa, probably because they were allowed to undergo a natural succession. Nevertheless, abandoned ponds were also amongst the largest, so that it remained difficult to separate the effects of pond size and abandonment, although both factors were likely to interact to favour higher taxon richness. The invertebrate communities in the ponds appeared to be influenced mainly by widely acting environmental factors (e.g. area, regionalization of assemblages) with little evidence that pond use (e.g. cattle watering, amenity) generally influenced assemblage composition. Our results support the idea that agricultural landscapes containing man-made ponds make a significant contribution to freshwater biodiversity indicating that protection of farm ponds from threats such as in-filling and pollution can make a positive contribution to the maintenance of aquatic biodiversity. This added value for biodiversity should be considered when calculating the economic costs and benefits of constructing water bodies for human activities.
in Hydrobiologia > n°597 (2008) . - pp 43-51[article]Developing a multimetric index of ecological integrity based on macroinvertebrates of mountain ponds in central Italy / Angelo Solimini, G. (2008)
Titre : Developing a multimetric index of ecological integrity based on macroinvertebrates of mountain ponds in central Italy Type de document : texte imprimé Auteurs : G. Angelo Solimini ; Marcello Bazzanti ; Antonio RUGGERIO ; Gianmaria Carchini Année de publication : 2008 Article en page(s) : pp 109-123 Catégories : Ecoplanète
Appenins ; Bioassessment ; macroinvertebrates ; Mountain ponds
Résumé : The lack of biological systems for the assessment of ecological quality specific to mountain ponds prevents the effective management of these natural resources. In this article we develop an index based on macroinvertebrates sensitive to the gradient of nutrient enrichment. With this aim, we sampled 31 ponds along a gradient of trophy and with similar geomorphological characteristics and watershed use in protected areas of the central Apennines. A bioassessment protocol was adopted to collect and process benthic samples and key-associated physical, chemical, and biological variables during the summer growth season of 1998. We collected 61 genera of macroinvertebrates belonging to 31 families. We calculated 31 macroinvertebrate metrics based on selected and total taxa richness, richness of some key groups, abundance, functional groups and tolerance to organic pollution. The gradient of trophy was quantified with summer concentrations of chlorophyll a. We followed a stepwise procedure to evaluate the effectiveness of a given metric for use in the multimetric index. Those were the pollution tolerance metric ASPT, three metrics based on taxonomic richness (the richness of macroinvertebrate genera, the richness of chironomid taxa, and the percentage of total richness composed by Ephemeroptera, Odonata, and Trichoptera), two metrics based on FFG attributes (richness of collector gatherer taxa and richness of scraper taxa) and the habitbased metric richness of burrowers. The 95th percentile of each metric distribution among all ponds was trisected for metric scoring. The final Pond Macroinvertebrate Integrity Index ranged from 7 to 35 and had a good correlation (R2 = 0.71) with the original gradient of environmental degradation.
in Hydrobiologia > n°597 (2008) . - pp 109-123[article]Eutrophication: are mayflies (Ephemeroptera) good bioindicators for ponds? / MENETREY, N. (2008)
Titre : Eutrophication: are mayflies (Ephemeroptera) good bioindicators for ponds? Type de document : texte imprimé Auteurs : N. MENETREY ; B. OERTLI ; M. Sartori ; A. Wagner ; J. B. Lachavanne Année de publication : 2008 Article en page(s) : pp 125-135 Catégories : Ecoplanète
Ephémère ; Ephemeroptera ; Eutrophication ; EUTROPHISATION ; macroinvertebrates
Résumé : Ephemeroptera larvae are recognized worldwide for their sensitivity to oxygen depletion in running waters, and are therefore commonly used as bioindicators in many monitoring programmes. Mayflies inhabiting lentic waters, like lakes and ponds, in contrary have been poorly prospected in biomonitoring. For this purpose, a better understanding of their distribution in lentic habitats and of the relations of species presence with environmental conditions are needed. Within this framework, 104 ponds were sampled in Switzerland. The Ephemeroptera are found to be an insect order particularly well represented in the ponds studied here (93% of the lowland ponds). Nevertheless, in terms of diversity, they are relatively poorly represented (mean species number = 1.9). Two species dominated: Cloeon dipterum (Baetidae) and Caenis horaria (Caenidae). The investigations contributed to the updating of the geographical distribution of the species in Switzerland, as many of the observations appear to be from new localities. The trophic state of ponds appears here to be important for Ephemeroptera communities. First, there is a negative relationship between total phosphorus (TP) concentrations and species richness. Second, the presence of Caenis horaria or Cloeon dipterum is dependent on the trophic state. Caenis horaria is most closely associated with low levels of TP concentrations, while Cloeon dipterum appears to be less sensitive, and is most frequently found in hypertrophic conditions. A probable consequence of these relations, is that Baetidae are always present when Caenidae are also present. Contrastingly, Baetidae is observed as the only mayflies family present in several ponds.
in Hydrobiologia > n°597 (2008) . - pp 125-135[article]Evaluation of sampling methods for macroinvertebrate biodiversity estimation in heavily vegetated ponds / Becerra Jurado, G. (2008)
Titre : Evaluation of sampling methods for macroinvertebrate biodiversity estimation in heavily vegetated ponds Type de document : texte imprimé Auteurs : G. Becerra Jurado ; M. Masterson ; R. Harrington ; M. Kelly-Quinn Année de publication : 2008 Article en page(s) : pp 97-107 Catégories : Ecoplanète
biodiversity ; macroinvertebrates ; Methodology ; Sampling
Résumé : This article presents an evaluation of two sampling methods for assessing the biodiversity of heavily vegetated wetlands. The aim was to establish an effective sampling regime to maximise total taxon richness and minimise sampling effort. Three Integrated Constructed Wetland (ICW) systems in Annetown Valley, Co. Waterford, SE of the Republic of Ireland, were sampled during spring and summer 2005. The two methods that were evaluated were pond netting and two types of horizontal activity traps, namely ''horizontal activity traps'' (HATs) and modified ''horizontal activity traps'' (modified HATs). The activity traps provided a one-way funnel system and were constructed from 2 l plastic bottles, allowing for the passive collection of taxa. HATs were designed to capture macroinvertebrates in open water and modified HATs, which were designed specifically for this study, were used to sample within stands of dense emergent vegetation. Results show that a combination of pond netting and activity traps will yield a more complete estimate of taxon richness. The performance of Modified HATs was not significantly different from that of the HATs in dense vegetation. Tests on the sampling effort required for each method are also discussed.
in Hydrobiologia > n°597 (2008) . - pp 97-107[article]Macroinvertebrate communities in sediment and plants in coastal Mediterranean water bodies (Central Iberian Peninsula). / Sahuquillo M (2007)
Titre : Macroinvertebrate communities in sediment and plants in coastal Mediterranean water bodies (Central Iberian Peninsula). Type de document : texte imprimé Auteurs : Sahuquillo M ; Poquet JM ; Rueda J & Miracle MR Editeur : Université Paul sabatier - Toulouse III Année de publication : 2007 Importance : pp 117-130 Catégories : Ecoplanète
biodiversity ; macroinvertebrates ; Mediterranean coastal ponds ; salinityWhere hides the aquatic biodiversity of macroinvertebrates in the Canton of Geneva (Switzerland)? / Sandrine Angélibert (2006)Permalink