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Auteur Demarcq, H.; Reygondeau, G.; Alvain, S.; Vantrepotte, V.
Titre (up) Monitoring marine phytoplankton seasonality from space Type Article scientifique
Année 2012 Publication Revue Abrégée Remote Sensing of Environment
Volume 117 Numéro Pages 211-222
Mots-Clés Biogeography; Phytoplankton; Phytoplankton Functional; remote sensing; seasonality; Seasonal parameters; Surface chlorophyll concentration; Types; Wavelet transform
Résumé Remote sensing techniques are used to study the large scale patterns related to the seasonal modes of variability of the marine phytoplankton. Ten years of monthly composite maps of sea surface chlorophyll-a concentration and the PHYSAT database of four Phytoplanktonic Functional Types (PFTs), both from SeaWiFS, are used to investigate characteristics of phytoplankton seasonality in the trades and westerlies wind oceanic biomes, where data density is adequate. We use a combination of wavelet transform and statistical techniques that allow us to quantify both intensity and duration of the seasonal oscillation of chlorophyll-a concentration and PFTs relative occurrence, and to map these relationships. Next, the seasonal oscillations detected are related to four PFTs revealing six major global phytoplanktonic associations. Our results elucidate the intensity and duration of the seasonal dynamic of the chlorophyll-a concentration and of the relative occurrence of four PFTs at a global scale. Thus, the typology of the different types of seasonality is investigated. Finally, an overall agreement between the results and the biogeochemical provinces partition proposed by Longhurst is found, revealing a strong environmental control on the seasonal oscillation of primary producers and a clear latitudinal organization in the succession of the phytoplankton types. Results provided in this study quantify the seasonal oscillation of key structural parameters of the global ocean, and their potential implications for our understanding of ecosystem dynamics.
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ISSN 0034-4257 ISBN Médium
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Numéro d'Appel LL @ pixluser @ collection 182
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Auteur Mazel, F.; Guilhaumon, F.; Mouquet, N.; Devictor, V.; Gravel, D.; Renaud, J.; Cianciaruso, M.V.; Loyola, R.; Diniz, J.A.F.; Mouillot, D.; Thuiller, W.
Titre (up) Multifaceted diversity-area relationships reveal global hotspots of mammalian species, trait and lineage diversity Type Article scientifique
Année 2014 Publication Revue Abrégée Global Ecology and Biogeography
Volume 23 Numéro 8 Pages 836-847
Mots-Clés Conservation biogeography; Hill's numbers; biodiversity hotspots; congruent; conservation priorities; diversity indices; ecoregions; endemism; evolutionary; functional diversity-area; histories; mammals; phylogenetic diversity; phylogenetic diversity-area; relationship; richness gradients; spatial-patterns; species-area relationship
Résumé Aim To define biome-scale hotspots of phylogenetic and functional mammalian biodiversity (PD and FD, respectively) and compare them with 'classical' hotspots based on species richness (SR) alone. Location Global. Methods SR, PD and FD were computed for 782 terrestrial ecoregions using the distribution ranges of 4616 mammalian species. We used a set of comprehensive diversity indices unified by a recent framework incorporating the relative species coverage in each ecoregion. We built large-scale multifaceted diversity-area relationships to rank ecoregions according to their levels of biodiversity while accounting for the effect of area on each facet of diversity. Finally we defined hotspots as the top-ranked ecoregions. Results While ignoring relative species coverage led to a fairly good congruence between biome-scale top ranked SR, PD and FD hotspots, ecoregions harbouring a rich and abundantly represented evolutionary history and FD did not match with the top-ranked ecoregions defined by SR. More importantly PD and FD hotspots showed important spatial mismatches. We also found that FD and PD generally reached their maximum values faster than SR as a function of area. Main conclusions The fact that PD/FD reach their maximum value faster than SR could suggest that the two former facets might be less vulnerable to habitat loss than the latter. While this point is expected, it is the first time that it has been quantified at a global scale and should have important consequences for conservation. Incorporating relative species coverage into the delineation of multifaceted hotspots of diversity led to weak congruence between SR, PD and FD hotspots. This means that maximizing species number may fail to preserve those nodes (in the phylogenetic or functional tree) that are relatively abundant in the ecoregion. As a consequence it may be of prime importance to adopt a multifaceted biodiversity perspective to inform conservation strategies at a global scale.
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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 1466-822x ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 722
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Auteur Charmantier, G.; Anger, K.
Titre (up) Ontogeny of osmoregulatory patterns in the South American shrimp Macrobrachium amazonicum: Loss of hypo-regulation in a land-locked population indicates phylogenetic separation from estuarine ancestors Type Article scientifique
Année 2011 Publication Revue Abrégée Journal of Experimental Marine Biology and Ecology
Volume 396 Numéro 2 Pages 89-98
Mots-Clés Biogeography; Crustacea; Life-history adaptations; Osmoregulation; ontogeny; speciation
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Volume de collection Numéro de collection Edition
ISSN 0022-0981 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 757
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Auteur Tedesco, P.A.; Leprieur, F.; Hugueny, B.; Brosse, S.; Dürr, H.H.; Beauchard, O.; Busson, F.; Oberdorff, T.
Titre (up) Patterns and processes of global riverine fish endemism Type Article scientifique
Année 2012 Publication Revue Abrégée Global Ecology and Biogeography
Volume 21 Numéro 10 Pages 977-987
Mots-Clés Dispersal ability; freshwater fish; glacial maximum; global distribution; island biogeography; isolation; neo-endemism; palaeo-endemism; speciation
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Volume de collection Numéro de collection Edition
ISSN 1466-8238 ISBN Médium
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Notes Approuvé pas de
Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 776
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Auteur Evans, S.M.; McKenna, C.; Simpson, S.D.; Tournois, J.; Genner, M.J.
Titre (up) Patterns of species range evolution in Indo-Pacific reef assemblages reveal the Coral Triangle as a net source of transoceanic diversity Type Article scientifique
Année 2016 Publication Revue Abrégée Biol. Lett.
Volume 12 Numéro 6 Pages 20160090
Mots-Clés Bayesian skyline plot; biogeography; climate change; coral reef; fishes global patterns; marine biodiversity; ocean; phylogeography; refugia; species distributions
Résumé The Coral Triangle in the Indo-Pacific is a region renowned for exceptional marine biodiversity. The area could have acted as a 'centre of origin' where speciation has been prolific or a 'centre of survival' by providing refuge during major environmental shifts such as sea-level changes. The region could also have acted as a 'centre of accumulation' for species with origins outside of the Coral Triangle, owing to it being at a central position between the Indian and Pacific oceans. Here, we investigated support for these hypotheses using population-level DNA sequence-based reconstructions of the range evolution of 45 species (314 populations) of Indo-Pacific reef-associated organisms. Our results show that populations undergoing the most ancient establishment were significantly more likely to be closer to the centre of the Coral Triangle than to peripheral locations. The data are consistent with the Coral Triangle being a net source of coral-reef biodiversity for the Indo-Pacific region, suggesting that the region has acted primarily as a centre of survival, a centre of origin or both. These results provide evidence of how a key location can influence the large-scale distributions of biodiversity over evolutionary timescales.
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Langue English Langue du Résumé Titre Original
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ISSN 1744-9561 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 1694
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