Cryptic diversity in a chirally variable land snail.

Modica, M. V., Colangelo, P., Hallgass, A., Barco, Andrea and Oliverio, M. (2016) Cryptic diversity in a chirally variable land snail. Open Access Italian Journal of Zoology, 83 (3). pp. 351-363. DOI 10.1080/11250003.2016.1186234.

[img]
Preview
Text
Cryptic diversity in a chirally variable land snail.pdf - Published Version
Available under License Creative Commons: Attribution 4.0.

Download (1748Kb) | Preview
[img]
Preview
Text
tizo_a_1186234_sm8230.pdf - Supplemental Material

Download (353Kb) | Preview

Supplementary data:

Abstract

Jaminia quadridens (Mollusca: Gastropoda: Heterobranchia: Pulmonata: Stylommatophora: Enidae) is a land snail living up to 2400 m above sea level on calcareous meadow slopes. It is widely distributed in Central and Southern Europe, with two subspecies currently recognised (J. quadridens quadridens and J. quadridens elongata). Like other Enidae, the genus Jaminia is sinistrally coiled, whilst the vast majority of gastropods are dextral. Chirality in snails is determined in the early embryonic stages by a single gene with maternal effect. Following the discovery of reversed (dextral) populations in Abruzzi, we investigated the genetic variability of Jaminia quadridens in central and southern Italy. In fact, reversal of chirality is often associated with extremely rapid speciation in snails (“single gene speciation”), as gene flow between opposite chiral morphs can be severely reduced by pre-copula isolation mechanisms. Phylogenetic analyses with different inference methods, haplotype analyses and species delimitation analyses were carried out on cytochtome oxydase subunit I (COI) sequences of 126 Jaminia specimens from central and southern Italy, Sardinia and Provence. Our results suggested a complex framework, with at least five lineages that may represent distinct species, in agreement with biogeographic patterns previously reported for other terrestrial taxa. Southern populations of an ancestral stock probably underwent allopatric speciation while surviving in glacial refugia during the Pleistocene. Colonization of central Italy may be recent, with evidences of current gene flow between populations of a single species, which includes reversed individuals. The appearance of chiral reversal was statistically associated with marginal demes but apparently not related to other biological, ecological or historical factors. As land snails are generally severely affected by habitat degradation, due to their ecological requirements, our results have important implications for conservation. J. quadridens in Italy may comprise a complex of distinct species, mostly with restricted ranges, which may suffer from environmental changes more than a single, widely distributed species would.

Document Type: Article
Keywords: chirality; COI; Jaminia; species delimitation
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1080/11250003.2016.1186234
ISSN: 1125-0003
Date Deposited: 06 Jun 2016 07:59
Last Modified: 01 Feb 2019 15:09
URI: http://oceanrep.geomar.de/id/eprint/33008

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...