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| Muths, D.; Jollivet, D.; Gentil, F.; Davoult, D.. |
| The brittle star Ophiothrix fragilis (Abilgaard, 1789) constitutes a heterogeneous morphological group that can be subdivided into 4 varieties. The species is also characterized by high demographic variability. The present study explores the possibility of genetic patchiness arising due to admixture of varieties or recruitment heterogeneity. We sequenced a portion of the mitochondrial cytochrome oxidase subunit I (mtCOI) gene and genotyped 7 allozymes from 21 populations of the 2 most common varieties. While mtCOI analyses showed that all the varieties grouped together with virtually no divergence among them (< 1%), a clear divergence (18.6%) was evident between the northern Atlantic populations and individuals collected in the Mediterranean and along... |
| Tipo: Text |
Palavras-chave: Echinoderm; Allozyme; MtCOI; Population dynamics; Ecotypes; Dispersal; Recruitment. |
| Ano: 2009 |
URL: https://archimer.ifremer.fr/doc/00301/41247/40439.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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| Machado,Juliana Medianeira; Dall'Agnol,Miguel; Motta,Eder Alexandre Minski da; Pereira,Emerson André; Simioni,Carine; Weiler,Roberto Luis; Zuñeda,Marcos Perera; Ferreira,Priscila Becker. |
| ABSTRACT The objective of this study was to evaluate the influence of photoperiod on the forage yield by ecotypes and intraspecific hybrids of P. notatum. Tetraploid ecotypes from the United States Department of Agriculture and the National University of the Northeast in Argentina, in addition to six intraspecific hybrids, totaling 19 ecotypes, were assessed. The materials evaluated were subjected to an extended photoperiod (14 h of light) and natural photoperiod from July 2011 to October 2012. The experimental design was a completely randomized factorial scheme of 19 × 2 (ecotypes × photoperiod) consisting of five replicates. The materials were influenced differentially by the variation in photoperiod, with one group showing high sensitivity, whereas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ecotypes; Forage yield; Hybrids; Subtropical grass. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000100008 |
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| ROTUNDO,JOSÉ L; CIPRIOTTI,PABLO A; GUNDEL,PEDRO E. |
| We studied morphological and growth responses to drought of two sub-populations of Bromus pictus from communities with soils with different water availability from the Patagonian steppe. After a process of acclimatization common to both sub-populations, individuals from both sub-populations were subjected to three levels of water availability during 44 days. Independently of the water availability treatment, the sub-population from the community of high soil water availability showed higher aboveground relative growth rate (RGR) and higher leaf size (area and weight) compared to the sub-population from the community of low soil water availability. These results prove the expected evolution of higher growth rates and leaf sizes in resource rich... |
| Tipo: Journal article |
Palavras-chave: Arid lands; Drought; Ecotypes; Genetic variation; Soil depth. |
| Ano: 2006 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000100006 |
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