Data/hora: 04/06/2024 13:14:19

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 15/09/2008
Data da última atualização: | 15/09/2008
Autoria: | NOVO, M.; FERNÁNDEZ, R.; ALMODÓVAR, A.; DÍAZ-COSÍN, D. J.
Título: | High genetic divergence among Hormogaster populations in Central Iberian Peninsula revealed by COI gene.
Ano de publicação: | 2008
Fonte/Imprenta: | In: INTERNATIONAL COLLOQUIUM ON SOIL ZOOLOGY, 15; INTERNATIONAL COLLOQUIUM ON APTERYGOTA, 12., 2008, Curitiba. Biodiversity, conservation and sustainabele management of soil animal: abstracts. Colombo: Embrapa Florestas. Editors: George Gardner Brown; Klaus Dieter Sautter; Renato Marques; Amarildo Pasini. 1 CD-ROM.
Idioma: | Inglês

Conteúdo:

The family Hormogastridae, consists of various genera and species of large and middle-sized
earthworms distributed in western Palearctic Region, almost exclusive to the countries and
islands of the western Mediterranean. In central Iberian Peninsula only one described species
within Hormogaster genus is found, Hormogaster elisae, an endemic species to this area. This
species can be very abundant in sandy and poor in organic matter soils, with strong erosion and
summer aridity. Climate change will presumably favour the extension of this kind of soils, where
Hormogaster genera and specifically H. elisae could be the only ones capable of thriving. Because
of that, their ecological importance could become crucial and hence, it is necessary to look into
their genetic variability in order to develop conservation and management programmes.
The objectives of this study were to determine the levels of genetic differentiation and estimate
the amount of gene flow occurring among populations of H. elisae as well as to study the possible
phylogenetic relationships among them. For this purpose, first subunit of cytochrome c oxidase
mitochondrial gene (COI) was sequenced for 82 individuals from 7 localities, resulting in 38
haplotypes exclusive to localities.
The analysis of molecular variance indicated a significant interpopulation genetic diversity and
the Mantel test revealed a pattern of isolation by distance. Values of genetic divergence were
surprisingly high (up to 20.20%) and the haplotype network (constructed using statistical
parsimony) showed a clear separation among populations. Phylogenetic analyses (Neighborjoining,
Maximum parsimony, Maximum-likelihood and Bayesian) also showed an agreement
between the generated clades and the geographic location, supported by high bootstrap and
posterior probability values.
The results suggest the occurrence of more than one Hormogaster species in central Iberian
Peninsula. Therefore, we are currently studying the problem in a wider spatial scale and with
different approaches to take a final decision about the limit of those species

Categoria do assunto: | --
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (43556-1) - UPE - PL - -- - CD0305 -  -  - DIS