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Registros recuperados: 4
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Aerial surveys to monitor bluefin tuna abundance and track efficiency of management measures ArchiMer
Bauer, Robert; Bonhommeau, Sylvain; Brisset, Blandine; Fromentin, Jean-marc.
Conservation and management measures for exploited fish species rely on our ability to monitor variations in population abundance. In the case of the eastern stock of Atlantic bluefin tuna (ABFT), recent changes in management policies have strongly affected the reliability of fishery-dependent indicators due to drastic changes in fishing season/area, fisheries selectivity and strategy. However, fishery-independent indices of abundance are rare for large pelagic fish, and obtaining them is often costly and labor intensive. Here, we show that scientific aerial surveys are an appropriate tool for monitoring juvenile bluefin tuna abundance in the Mediterranean. We present an abundance index based on 62 aerial surveys conducted since 2000, using 2 statistical...
Tipo: Text Palavras-chave: Thunnus thynnus; Index of abundance; Fishery-independent; Gulf of Lions; Mediterranean Sea; Strip transect; Distance sampling.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00281/39192/45096.pdf
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Co-Occurrence and Habitat Use of Fin Whales, Striped Dolphins and Atlantic Bluefin Tuna in the Northwestern Mediterranean Sea ArchiMer
Bauer, Robert; Fromentin, Jean-marc; Demarcq, Herve; Brisset, Blandine; Bonhommeau, Sylvain.
Different dolphin and tuna species have frequently been reported to aggregate in areas of high frontal activity, sometimes developing close multi-species associations to increase feeding success. Aerial surveys are a common tool to monitor the density and abundance of marine mammals, and have recently become a focus in the search for methods to provide fisheries-independent abundance indicators for tuna stock assessment. In this study, we present first density estimates corrected for availability bias of fin whales (Balaenoptera physalus) and striped dolphins (Stenella coeruleoalba) from the Golf of Lions (GoL), compared with uncorrected estimates of Atlantic bluefin tuna (ABFT; Thunnus thynnus) densities from 8 years of line transect aerial surveys. The...
Tipo: Text
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00284/39481/37969.pdf
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Optimizing PAT data transmission: assessing the accuracy of temperature summary data to estimate environmental conditions ArchiMer
Bauer, Robert; Forget, Fabien; Fromentin, Jean-marc.
Pop-up archival tags (PAT) provide summary and high-resolution time series data at predefined temporal intervals. The limited battery capabilities of PATs often restrict the transmission success and thus temporal coverage of both data products. While summary data are usually less affected by this problem, as a result of its lower size, it might be less informative. We here investigate the accuracy and feasibility of using temperature at depth summary data provided by PATs to describe encountered oceanographic conditions. Interpolated temperature at depth summary data was found to provide accurate estimates of three major thermal water column structure indicators: thermocline depth, stratification and ocean heat content. Such indicators are useful for the...
Tipo: Text Palavras-chave: Mixed layer depth; Ocean heat content; Pop-up archival tags; PAT-style Depth-Temperature Profiles; Temperature at depth; Thermal stratification; Thermocline.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00287/39800/45102.pdf
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Veränderung des Brandsporenpotenzials von Steinbrand- (Tilletia caries) und Zwergsteinbrandsporen (T. controversa) im Boden unter Berücksichtigung verschiedener Fruchtfolgen des ökologischen Landbaus Organic Eprints
Bauer, Robert; Voit, Benno; Killermann, Berta; Hülsbergen, Kurt-Jürgen.
Steinbrand und Zwergsteinbrand sind bedeutende Krankheiten im ökologischen Landbau. Starker Befall führt zu einem Anstieg des Brandsporenpotenzials im Boden. 3-jährige, randomisierte Fruchtfolgeversuche werden an drei Standorten in vier Wiederholungen auf frisch befallenen Flächen durchgeführt. Die Böden weisen dabei entweder Brandsporen von T. controversa oder von T. caries auf. Es soll im Rahmen des Versuchs überprüft werden, ob durch im ökologischen Landbau übliche Fruchtfolgen das Brandsporenpotenzial im Boden reduziert werden kann. Durch Anbau von Senf als Zwischenfrucht wird getestet, ob durch die Freisetzung von Thiocyanaten und Isothiocyanaten nach dem Mulchen und anschlieβendes Einarbeiten in den Boden eine Abnahme der Sporenzahl im Boden erfolgt....
Tipo: Conference paper, poster, etc. Palavras-chave: Crop health; Quality; Protection.
Ano: 2015 URL: http://orgprints.org/27009/1/27009_bauer.pdf
Registros recuperados: 4
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