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| Cachera, Marie; Le Loc'H, Francois. |
| The relationships between diversity and ecosystem functioning have become a major focus of science. A crucial issue is to estimate functional diversity, as it is intended to impact ecosystem dynamics and stability. However, depending on the ecosystem, it may be challenging or even impossible to directly measure ecological functions and thus functional diversity. Phylogenetic diversity was recently under consideration as a proxy for functional diversity. Phylogenetic diversity is indeed supposed to match functional diversity if functions are conservative traits along evolution. However, in case of adaptive radiation and/or evolutive convergence, a mismatch may appear between species phylogenetic and functional singularities. Using highly threatened taxa,... |
| Tipo: Text |
Palavras-chave: Adaptive radiation; Conservation; Endangered clade; Evolutionary convergence; Niche conservatism; Phylogenetic signal. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00400/51113/69865.pdf |
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| Brown, Mark V.; Lauro, Federico M.; Demaere, Matthew Z.; Muir, Les; Wilkins, David; Thomas, Torsten; Riddle, Martin J.; Fuhrman, Jed A.; Andrews-pfannkoch, Cynthia; Hoffman, Jeffrey M.; Mcquaid, Jeffrey B.; Allen, Andrew; Rintoul, Stephen R.; Cavicchioli, Ricardo. |
| The ubiquitous SAR11 bacterial clade is the most abundant type of organism in the world’s oceans, but the reasons for its success are not fully elucidated. We analysed 128 surface marine metagenomes, including 37 new Antarctic metagenomes. The large size of the data set enabled internal transcribed spacer (ITS) regions to be obtained from the Southern polar region, enabling the first global characterization of the distribution of SAR11, from waters spanning temperatures −2 to 30°C. Our data show a stable co-occurrence of phylotypes within both ‘tropical’ (>20°C) and ‘polar’ (<10°C) biomes, highlighting ecological niche differentiation between major SAR11 subgroups. All phylotypes display transitions in abundance that are strongly correlated with... |
| Tipo: Text |
Palavras-chave: Adaptive radiation; Antarctica; Metagenome; Pelagibacter; Phylotype distribution. |
| Ano: 2012 |
URL: https://archimer.ifremer.fr/doc/00140/25132/23242.pdf |
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| Taylor, John D.; Glover, Emily A.; Williams, Suzanne T.. |
| Although species of the chemosymbiotic bivalve family Lucinidae are often diverse and abundant in shallow water habitats such as seagrass beds, new discoveries show that the family is equally speciose at slope and bathyal depths, particularly in the tropics, with records down to 2500m. New molecular analyses including species from habitats down to 2000m indicate that these cluster in four of seven recognized subfamilies: Leucosphaerinae, Myrteinae, Codakiinae, and Lucininae, with none of these comprising exclusively deep-water species. Amongst the Leucosphaerinae, Alucinoma, Epidulcina, Dulcina, and Myrtina live mainly at depths greater than 200m. Most Myrteinae inhabit water depths below 100m, including Myrtea, Notomyrtea, Gloverina, and Elliptiolucina... |
| Tipo: Text |
Palavras-chave: Adaptive radiation; Chemosymbiosis; Hydrocarbon seeps; Phylogeny. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00218/32953/31615.pdf |
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| Schubart, C.D.; Santl, T.; Koller, P.. |
| Due to their long-term ecological stability, ancient lakes represent very interesting systems for studying differentiation and speciation processes. High degrees of endemism and specialisation are characteristic features of their fauna. The Malili lakes from the Indonesian island Sulawesi are considered an ancient limnic system, and recent research has increased the number of recognized species and the knowledge about ecological and morphological diversification within a variety of animal taxa. Here we show that the local endemic gecarcinucid freshwater crabs are more differentiated than qualitative morphological characters and the current taxonomy may indicate. The morphologically and ecologically well characterised species Nautilothelphusa zimmeri Balss,... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Species flock; Adaptive radiation; Ecotypes; Morphotypes; Genetic barcoding; Cox1 mtDNA; 42.74. |
| Ano: 2008 |
URL: http://www.repository.naturalis.nl/record/280475 |
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| Hoso, M.. |
| The nearly neutral theory of molecular evolution predicts that small population size is essential for non-adaptive evolution. Evolution of whole-body left-right reversal in snails is generally a compelling example of non-adaptive speciation, because variants with reversed chirality would suffer from reduced mating opportunities within a population. Despite this reproductive disadvantage, sinistral snail species have repeatedly originated from dextral ancestors in terrestrial pulmonates. Here I show that snail speciation by reversal has been accelerated on oceanic islands. Analysing the global biogeography of 995 genera across 84 stylommatophoran families, I found that the proportion of sinistral snail genera was enhanced in genera endemic to oceanic... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Adaptive radiation; Evolutionary novelty; Innovation; Island area; Origin of species; 42.21. |
| Ano: 2012 |
URL: http://www.repository.naturalis.nl/record/419171 |
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