74 research outputs found
Pelagic survey series for sardine and anchovy in ICES subareas 8 and 9 â Towards an ecosystem approach
Sensitivity analysis of school parameters to compare schools from different surveys: a review of the standardisation task of the EC-FAIR programme CLUSTER
Echo traces seen on echo grams contain a lot of information about the aggregation of fish in
schools. But the acosutic image obtained with a vertical biomass assessment echosounder
contains distorsions mainly due to the beam angle, the equipment settings and the school
depth. When the acoustic image of aggregation patterns changes over the years or varies
between stocks, it is important to know up to what extent biological interpretation is
meaningful!. The present paper reviews the work performed by a group of scientist within the
EC FAIR programme CLUSTER. Simulations were performed to correct school parameters.
Digital data were replayed to assess the importance of these corrections. Charts were derived
to limit biological interpretation of changes on the school acoustic images
Vulnerability of the North Water ecosystem to climate change
High Arctic ecosystems and Indigenous livelihoods are tightly linked and exposed to climate change, yet assessing their sensitivity requires a long-term perspective. Here, we assess the vulnerability of the North Water polynya, a unique seaice ecosystem that sustains the worldâs northernmost Inuit communities and several keystone Arctic species. We reconstruct mid-to-late Holocene changes in sea ice, marine primary production, and little auk colony dynamics through multi-proxy analysis of marine and lake sediment cores. Our results suggest a productive ecosystem by 4400â4200âcalâyrs b2k coincident with the arrival of the first humans in Greenland. Climate forcing during the late Holocene, leading to periods of polynya instability and marine productivity decline, is strikingly coeval with the human abandonment of Greenland from c. 2200â1200âcalâyrs b2k. Our long-term perspective highlights the future decline of the North Water ecosystem, due to climate warming and changing sea-ice conditions, as an important climate change risk
Table S2: Genes that are â„2 à or â€Â â 2 à differentially expressed in A. salmonicida fur
Report of the Working Group on Acoustic and Egg Surveys for Sardine and Anchovy in ICES Areas VIII and IX (WGACEGG)
Acoustic detection of the spatial and temporal distribution of fish shoals in the Bay of Biscay
Echo sounder data were used to investigate the spatio-temporal variability of shoal behaviour in the Bay of Biscay. Data collected from annual surveys were processed using MOVIES-B software in order to mcasure this variability. The software was designed to measure morphological, energetic and space-time distribution descriptors from the acoustic signal received from fish shoals. Two surveys, DAAG 90 and DAAG 91, provided the appropriate characteristics for such an analysis. The survey's objective was to obtain relative abundance indices for the anchovy (Engraulis encrasicolus) biomass in the Bay of Biscay. The surveys were carried out in the same area (southern Bay of Biscay), at the same period (April) within one year interval (1990 and 1991), using the same equipment (vessel, acoustic system, fishing gear) in a multispecies environment. Frequency distributions for every descriptor were obtained and used to describe the acoustic detection of fish shoals. The analysis of frequency distributions of space-time descriptors (year, day-hour and bottom depth) allowed the construction of derived discrete variables, which defined new subsets of detections. The subsets were then described by the continuous variables. A principal components analysis was used to describe the multidimensional data structure and to describe behaviour patterns. The size and external outline unevenness are correlated groups of shoal descriptors, but are independent of the water column shoal position and the degree of internal shoal structure. An important feature is shoal size variability between years. Significant differences in shoal characteristics were found between bathymetric zones of the same region and the pattern was similar between years. This spatial wariability is related to the distribution of different species between bathymetric zones. Although it was not possible to explain size variability between years, this will be necessary to improve shoal characterization. More knowledge about oceanographic conditions, the productivity level and availability of food, predator pressure and accurate identification of shoal speeies is required, in order to study the spatial or temporal variability in size and behaviour of shoals
La gestion de l'eau et des milieux aquatiques en zone humide littorale endiguée : une dimension multi-usages à affirmer et de nouvelles démarches à mettre en oeuvre. Exemple du marais Breton / The management of water and aquatic environments in dyked coastal marshes ; in support of view and multi-user approaches ; the case of the "marais Breton" in France
Most reports refer to a large decrease of wetland zones, despite the increasing awareness of the necessity of their protection. An important factor explaining this contradiction would be the failure to appreciate the importance of water and aquatic biotopes in rural planning and management. Dyked marshes of the Atlantic coast are no exception to this rule. The necessity of water management on a watershed scale in a new multiuser context must lead to new rules for wetlands management. The Life-Norspa programme developed on the Marais Breton as part ot the "SchĂ©ma de mise en valeur de la baie de Bourgneuf" aims to define some indicators of the condition of these wetlands and to estimate the constraints resulting from their protection. Some pilot-schemes have been implemented to put these concepts of integrated water management into practice.La plupart des bilans font Ă©tat dâune forte rĂ©gression des surfaces des zones humides, malgrĂ© une prise de conscience croissante de la nĂ©cessitĂ© de leur sauvegarde. L'absence de prise en compte significative de l'eau et des milieux aquatiques dans les dĂ©marches dĂ©veloppĂ©es sur ces territoires pourrait expliquer un tel dĂ©calage. Les marais endiguĂ©s de la façade atlantique, en position intermĂ©diaire entre continent et bande cĂŽtiĂšre, n'Ă©chappent pas Ă cette rĂšgle ; la nĂ©cessaire gestion de l'eau Ă l'Ă©chelle des bassins versants, dans un nouveau contexte de multi-usages, doit susciter une Ă©volution notable des structures et des modes de gestion de ces territoires et de leurs milieux aquatiques. Le programme Life-Norspa engagĂ© sur le marais Breton dans le cadre du SchĂ©ma de mise en valeur de la baie de Bourgneuf vise Ă dĂ©terminer des indicateurs dâĂ©tat des zones humides et Ă prĂ©ciser les contraintes liĂ©es Ă leur sauvegarde, en particulier sous lâaspect des peuplements piscicoles. Des amĂ©nagements tĂ©moins ont Ă©tĂ© rĂ©alisĂ©s pour mettre en application ces principes de gestion intĂ©grĂ©e.Merle ValĂ©rie, Rigaud Christian, MassĂ© Jacques. La gestion de l'eau et des milieux aquatiques en zone humide littorale endiguĂ©e : une dimension multi-usages Ă affirmer et de nouvelles dĂ©marches Ă mettre en oeuvre. Exemple du marais Breton / The management of water and aquatic environments in dyked coastal marshes ; in support of view and multi-user approaches ; the case of the "marais Breton" in France. In: Cahiers du Centre nantais de recherche pour l'amĂ©nagement rĂ©gional, n°47-48, 1997. Littoral 95 - Actes du Colloque International ContinuitĂ©s et ruptures sur les littoraux europĂ©ens. pp. 275-280
How artificial feeding for tourism-watching modifies black bear space use and habitat selection
Artificial feeding stations often are established to attract and habituate wildlife species to facilitate their observation, but this activity is controversial because of its potential negative impact on wildlife and, in some cases, threat to human safety. Bear managers have few empirical data to establish guidelines for bear-watching sites. The objective of our study was to compare behaviors of black bear (Ursus americanus) with access to a highly-predictable artificial food source established for tourist-watching purposes (n = 11) and control bears (n = 16) in the boreal forest of Quebec, Canada. We hypothesized that fed bears would have lesser movement rates and smaller home-range sizes than control bears, and that they would exhibit lower selection of habitat types providing abundant natural food resources (agricultural lands, regenerating, and disturbed stands) because they visit fewer food patches to meet their energy requirements. We also predicted that behavioral differences between fed and control bears would be most obvious during the period of hyperphagia (late summer and fall) when bears increase their food intake. Between 2008 and 2011, we located fed bears <1 km away from the feeding station 22.3 ± 3.7%, 48.5 ± 6.2%, and 55.9 ± 5.0% of the time in spring, summer, and fall seasons. Annual and seasonal ranges of control bears were 2.1 to 7.1 times larger than fed bears, except during the spring when bears often increased travel to access females for reproduction. Moreover, fed bears modified their movement pattern and selected vegetation types with abundant natural food resources to a lower degree, especially in the fall. Our results show that a well-supplied feeding station can attract and sustain many bears, even in relatively poor bear habitat, leading to a local increase in bear density that might exceed the social carrying capacity. Considering the use of space by fed bears, we recommend avoiding establishing feeding stations <11.5 km from locations where human-bear interactions should be limited (i.e., recreation sites, cabins, etc.). Behaviors adopted by fed bears were energetically profitable as evidenced by their approximately 40% greater body masses compared to control bears, suggesting the potentially positive influence of a feeding station on local population dynamics. We hope our results will increase awareness of wildlife managers about the impacts of feeding bear for tourism purposes
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