Konsentrasi logam berat pada makrofauna bentik di Kepulauan Kangean, Madura

Study of bioaccumulation of heavy metal at species of macrofauna benthic in Kangean €™s archipelago, Madura have been done at February 2004. This study was conducted in the effort data base compiling bioaccumulation of heavy metal, especially in Indonesia. As one of part of €œMussel Watch €? program what have been executed by cleft of world angle. Kangean €™s archipelago has been selected because its situation was very cloistered and far from modern industrial activity, and also inexistence of data about heavy metal €™s accumulation at macrofauna benthic. Sampling has been done in 2 station around island Arjasa (subdivision Arjasa), precisely in Erreng at 6 °53 €™00 €? S and 115 °14 €™26 €™ €™ E and Bilis-Bilis at 6 °50 €™45 €™ €™ S and 115 °14 €™54 €™ €™ E. Sampling has been conducted by using method of direct collection, and then treated in laboratory to analysis by AAS Spectra AA 250 plus of method flame. Species of Nassarius globosus, Anadara Scapha (big) and Saccostrea cucullata accumulate highest metal of Cu, Cd and Zn (in successively) 192,53 ± 154.65 μg/g dry weight, 13.30 ± 1.55 μg/g dry weight, and 1816.02 ± 367.28 μg/g dry weight

Measurement of EROD activity: Caution on spectral properties of standards used

IF: 0,958info:eu-repo/semantics/publishe

Fluxes and impact of anthropogenic contaminants (metals and PCBs) in echinoderms

info:eu-repo/semantics/nonPublishe

Key Features of Intertidal Food Webs That Support Migratory Shorebirds

International audienceThe migratory shorebirds of the East Atlantic flyway land in huge numbers during a migratory stopover or wintering on the French Atlantic coast. The Brouage bare mudflat (Marennes-Oléron Bay, NE Atlantic) is one of the major stopover sites in France. The particular structure and function of a food web affects the efficiency of carbon transfer. The structure and functioning of the Brouage food web is crucial for the conservation of species landing within this area because it provides sufficient food, which allows shorebirds to reach the north of Europe where they nest. The aim of this study was to describe and understand which food web characteristics support nutritional needs of birds. Two food-web models were constructed, based on in situ measurements that were made in February 2008 (the presence of birds) and July 2008 (absence of birds). To complete the models, allometric relationships and additional data from the literature were used. The missing flow values of the food web models were estimated by Monte Carlo Markov Chain – Linear Inverse Modelling. The flow solutions obtained were used to calculate the ecological network analysis indices, which estimate the emergent properties of the functioning of a food-web

How does the resuspension of the biofilm alter the functioning of the benthos–pelagos coupled food web of a bare mudflat in Marennes-Oléron Bay (NE Atlantic)?

International audienceIntertidal mudflats are ecosystems submitted to natural hydrodynamical forcings during each tide. When the off-shore water flows at high tide, a proportion of the biofilm produced at low tide can be resuspended in the water column and interact with the pelagic food web. As a consequence, the resuspension creates a link between the benthos and the pelagos, modifying their properties and the stability of the meta-ecosystem they form together. The aim of this study is to describe the consequences of the microbial biofilm resuspension on the pelagic food web, and to investigate the question of the stability of the benthos–pelagos coupling resulting from the biofilm resuspension. Two food webs were considered, corresponding to different hydrodynamical conditions in sum-mer condition: one allowing the biofilm massive resuspension, and one without resuspension, but with particle sedimentation. The Monte-Carlo Markov Chain Linear Modelling was used to estimate the unknown flows of the food web. The comparison of the Ecological Network Analysis indices for the two food webs allowed defining their respective differences of structure and functioning. The results showed that the massive resuspension of the microbial biofilm stimulates pelagic primary production and microbial food web via a higher bacterivory. The higher activity of the whole system coupled with both a drop in the specialisation of the trophic pathways and a low cycling activity demonstrated that when massive resuspension occurs, the system is disturbed. In con-trast, when sedimentation occurs, the food webs show functioning features pointing out to a higher stability of the whole system