bascule de visibilité Search & Display Options

Tout Sélectionner    Désélectionner
 |   | 
Détails
   print
  Enregistrements Liens
Auteur Durant, J.M.; Molinero, J.-C.; Ottersen, G.; Reygondeau, G.; Stige, L.C.; Langangen, O. doi  openurl
  Titre Contrasting effects of rising temperatures on trophic interactions in marine ecosystems Type Article scientifique
  Année 2019 Publication Revue Abrégée Sci Rep  
  Volume 9 Numéro Pages 15213  
  Mots-Clés biodiversity; calanus-finmarchicus; climate-change; fluctuations; life-history; mallotus-villosus; match; mismatch; phenology; thermal tolerance  
  Résumé In high-latitude marine environments, primary producers and their consumers show seasonal peaks of abundance in response to annual light cycle, water column stability and nutrient availability. Predatory species have adapted to this pattern by synchronising life-history events such as reproduction with prey availability. However, changing temperatures may pose unprecedented challenges by decoupling the predator-prey interactions. Here we build a predator-prey model accounting for the full life-cycle of fish and zooplankton including their phenology. The model assumes that fish production is bottom-up controlled by zooplankton prey abundance and match or mismatch between predator and prey phenology, and is parameterised based on empirical findings of how climate influences phenology and prey abundance. With this model, we project possible climate-warming effects on match-mismatch dynamics in Arcto-boreal and temperate biomes. We find a strong dependence on synchrony with zooplankton prey in the Arcto-boreal fish population, pointing towards a possible pronounced population decline with warming because of frequent desynchronization with its zooplankton prey. In contrast, the temperate fish population appears better able to track changes in prey timing and hence avoid strong population decline. These results underline that climate change may enhance the risks of predator-prey seasonal asynchrony and fish population declines at higher latitudes.  
  Adresse  
  Auteur institutionnel Thèse  
  Editeur Lieu de Publication Éditeur  
  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 2045-2322 ISBN Médium  
  Région Expédition Conférence  
  Notes WOS:000491859500003 Approuvé pas de  
  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2668  
Lien permanent pour cet enregistrement
 

 
Auteur Rogers, N.J.; UrbinaLt, M.A.; Reardon, E.E.; McKenzie, D.J.; Wilsonl, R.W. doi  openurl
  Titre A new analysis of hypoxia tolerance in fishes using a database of critical oxygen level (P-crit) Type Article scientifique
  Année 2016 Publication Revue Abrégée Conserv. Physiol.  
  Volume 4 Numéro Pages cow012  
  Mots-Clés Carbon dioxide; carp cyprinus-carpio; critical oxygen tension; eel anguilla-anguilla; environmental hypoxia; fresh-water fishes; goldfish carassius-auratus; inanga galaxias-maculatus; intermittent-flow respirometry; metabolic rate; oxygen and capacity limitation of thermal tolerance; physiological trait; postprandial metabolic-response; snapper pagrus-auratus; trout oncorhynchus-mykiss  
  Résumé Hypoxia is a common occurrence in aquatic habitats, and it is becoming an increasingly frequent and widespread environmental perturbation, primarily as the result of anthropogenic nutrient enrichment and climate change. An in-depth understanding of the hypoxia tolerance of fishes, and how this varies among individuals and species, is required to make accurate predictions of future ecological impacts and to provide better information for conservation and fisheries management. The critical oxygen level (P-crit)m has been widely used as a quantifiable trait of hypoxia tolerance. It is defined as the oxygen level below which the animal can no longer maintain a stable rate of oxygen uptake (oxyregulate) and uptake becomes dependent on ambient oxygen availability (the animal transitions to oxyconforming). A comprehensive database of P-crit values, comprising 331 measurements from 96 published studies, covering 151 fish species from 58 families, provides the most extensive and up-to-date analysis of hypoxia tolerance in teleosts. Methodologies for determining Pcrit are critically examined to evaluate its usefulness as an indicator of hypoxia tolerance in fishes. Various abiotic and biotic factors that interact with hypoxia are analysed for their effect on P, including temperature, CO,, acidification, toxic metals and feeding. Salinity, temperature, body mass and routine metabolic rate were strongly correlated with P-crit; 20% of variation in the P-crit, data set was explained by these four variables. An important methodological issue not previously considered is the inconsistent increase in partial pressure of CO, within a closed respirometer during the measurement of P-crit. Modelling suggests that the final partial pressure of CO, reached can vary from 650 to 3500 mu atm depending on the ambient pH and salinity, with potentially major effects on blood acid-base balance and P it itself. This database will form part of a widely accessible repository of physiological trait data that will serve as a resource to facilitate future studies of fish ecology, conservation and management.  
  Adresse  
  Auteur institutionnel Thèse  
  Editeur Lieu de Publication Éditeur  
  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 2051-1434 ISBN Médium  
  Région Expédition Conférence  
  Notes Approuvé pas de  
  Numéro d'Appel MARBEC @ alain.herve @ collection 1656  
Lien permanent pour cet enregistrement
 

 
Auteur Valladares, F.; Matesanz, S.; Guilhaumon, F.; Araujo, M.B.; Balaguer, L.; Benito-Garzon, M.; Cornwell, W.; Gianoli, E.; van Kleunen, M.; Naya, D.E.; Nicotra, A.B.; Poorter, H.; Zavala, M.A. url  doi
openurl 
  Titre The effects of phenotypic plasticity and local adaptation on forecasts of species range shifts under climate change Type Article scientifique
  Année 2014 Publication Revue Abrégée Ecology Letters  
  Volume 17 Numéro 11 Pages 1351-1364  
  Mots-Clés change impacts; climate change; climate variability hypothesis; ecological niche models; edge populations; environments; evolution; genetic differentiation; global change; intraspecific variation; local adaptation; niche; phenotypic plasticity; population differentiation; quercus-coccifera; reaction norms; thermal tolerance; tree populations  
  Résumé Species are the unit of analysis in many global change and conservation biology studies; however, species are not uniform entities but are composed of different, sometimes locally adapted, populations differing in plasticity. We examined how intraspecific variation in thermal niches and phenotypic plasticity will affect species distributions in a warming climate. We first developed a conceptual model linking plasticity and niche breadth, providing five alternative intraspecific scenarios that are consistent with existing literature. Secondly, we used ecological niche-modeling techniques to quantify the impact of each intraspecific scenario on the distribution of a virtual species across a geographically realistic setting. Finally, we performed an analogous modeling exercise using real data on the climatic niches of different tree provenances. We show that when population differentiation is accounted for and dispersal is restricted, forecasts of species range shifts under climate change are even more pessimistic than those using the conventional assumption of homogeneously high plasticity across a species' range. Suitable population-level data are not available for most species so identifying general patterns of population differentiation could fill this gap. However, the literature review revealed contrasting patterns among species, urging greater levels of integration among empirical, modeling and theoretical research on intraspecific phenotypic variation.  
  Adresse  
  Auteur institutionnel Thèse  
  Editeur Lieu de Publication Éditeur  
  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 1461-023x ISBN Médium  
  Région Expédition Conférence  
  Notes <p>ISI Document Delivery No.: AT8YX<br/>Times Cited: 4<br/>Cited Reference Count: 80<br/>Valladares, Fernando Matesanz, Silvia Guilhaumon, Francois Araujo, Miguel B. Balaguer, Luis Benito-Garzon, Marta Cornwell, Will Gianoli, Ernesto van Kleunen, Mark Naya, Daniel E. Nicotra, Adrienne B. Poorter, Hendrik Zavala, Miguel A.<br/>Spanish Ministry for Innovation and Science with the grant Consolider Montes [CSD2008 00040]; Community of Madrid grant REMEDINAL 2 [CM S2009 AMB 1783]; CYTED network ECONS [410RT0406]; Spanish Ministry of Economy and Competitiveness [1/SAE-SCTN/ALENT-07-0224-FEDER-001755, CGL2011-26852]<br/>This work was supported by the Spanish Ministry for Innovation and Science with the grant Consolider Montes [CSD2008 00040], the Community of Madrid grant REMEDINAL 2 [CM S2009 AMB 1783], and CYTED network ECONS (410RT0406). The Pinus sylvestris provenance tests used in this research are part of the Spanish Network of Genetic Trials (GENFORED). We thank all those involved in the establishment, maintenance and measurement of the trials. MBA also thanks the Portuguese IC&DT Call No 1/SAE-SCTN/ALENT-07-0224-FEDER-001755 and CGL2011-26852 project of the Spanish Ministry of Economy and Competitiveness for support of his research.<br/>Wiley-blackwell<br/>Hoboken</p> Approuvé pas de  
  Numéro d'Appel MARBEC @ alain.herve @ collection 1176  
Lien permanent pour cet enregistrement
 

 
Auteur Wang, T.; Lefevre, S.; Iversen, N.K.; Findorf, I.; Buchanan, R.; McKenzie, D.J. url  doi
openurl 
  Titre Anaemia only causes a small reduction in the upper critical temperature of sea bass: is oxygen delivery the limiting factor for tolerance of acute warming in fishes? Type Article scientifique
  Année 2014 Publication Revue Abrégée Journal of Experimental Biology  
  Volume 217 Numéro 24 Pages 4275-4278  
  Mots-Clés aerobic scope; cardiac-performance; Cardiovascular; climate-change; dicentrarchus-labrax; ecology; exp. biol. 216; fish; Haematocrit; metabolism; Oxygen transport; phenylhydrazine-induced anemia; thermal tolerance; trout  
  Résumé To address how the capacity for oxygen transport influences tolerance of acute warming in fishes, we investigated whether a reduction in haematocrit, by means of intra-peritoneal injection of the haemolytic agent phenylhydrazine, lowered the upper critical temperature of sea bass. A reduction in haematocrit from 42 +/- 2% to 20 +/- 3% (mean +/- s.e.m.) caused a significant but minor reduction in upper critical temperature, from 35.8 +/- 0.1 to 35.1 +/- 0.2 degrees C, with no correlation between individual values for haematocrit and upper thermal limit. Anaemia did not influence the rise in oxygen uptake between 25 and 33 degrees C, because the anaemic fish were able to compensate for reduced blood oxygen carrying capacity with a significant increase in cardiac output. Therefore, in sea bass the upper critical temperature, at which they lost equilibrium, was not determined by an inability of the cardio-respiratory system to meet the thermal acceleration of metabolic demands.  
  Adresse  
  Auteur institutionnel Thèse  
  Editeur Lieu de Publication Éditeur  
  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 0022-0949 ISBN Médium  
  Région Expédition Conférence  
  Notes <p>ISI Document Delivery No.: AW7BT<br/>Times Cited: 1<br/>Cited Reference Count: 44<br/>Wang, Tobias Lefevre, Sjannie Iversen, Nina K. Findorf, Inge Buchanan, Rasmus McKenzie, David J.<br/>Centre National de la Recherche Scientifique (CNRS); Danish Research Council; Region Languedoc-Roussillon (RLR); Ambassade de France in Copenhagen; Universite Montpellier 2<br/>This research was supported by the Centre National de la Recherche Scientifique (CNRS), the Danish Research Council, The Ambassade de France in Copenhagen and Universite Montpellier 2. T.W. was supported by a fellowship from Region Languedoc-Roussillon (RLR) as a visiting professor at Universite Montpellier 2. I.F. and N.K.I. were supported by a student grant from The Ambassade de France in Copenhagen.<br/>Company of biologists ltd<br/>Cambridge</p> Approuvé pas de  
  Numéro d'Appel MARBEC @ alain.herve @ collection 1181  
Lien permanent pour cet enregistrement
Tout Sélectionner    Désélectionner
 |   | 
Détails
   print

Save Citations:
Export Records: