Molecular and morphological data suggest weak phylogeographic structure in the fairy shrimp Streptocephalus torvicornis (Branchiopoda, Anostraca)

Federico Marrone, Giuseppe Alfonso, Miguel Alonso, Dimitra Synefiaridou, Ilias Kappas, Theodore J. Abatzopoulos, Graziella Mura

Risultato della ricerca: Article

8 Citazioni (Scopus)

Abstract

Inland aquatic organisms almost ubiquitously display a pattern of marked provincialism characterized by substantial population differentiation and genealogical discontinuities. This is the result of strong priority effects and local adaptation following dispersal and colonization of new habitats. We present a case that defies this biogeographic paradigm. We have investigated the phylogeography of the fairy shrimp Streptocephalus torvicornis across its circum-Mediterranean and Eurasian distribution. Based on three independent datasets, namely sequence variation at 12S and 16S rRNA, cyst morphology and male second antenna characters, we discern a pattern of extensive genetic and morphological homogeneity pointing to unhindered gene flow and widespread connectivity among populations. These intriguing findings may provisionally be explained by (i) a high dispersal frequency overwhelming the ability of a population to maintain resource monopolization, (ii) an outbreeding vigour opportunity offered to secondary immigrants, (iii) an ecological equivalence of genotypes generating long-term immigration–extinction equilibria and buffering genetic diversity over spatial scales, (iv) enhanced bird-mediated dispersal in open habitats as opposed to ponds surrounded by forests or shrub, or (v) a shallow population history with little time for substantial genetic differentiation.
Lingua originaleEnglish
pagine (da-a)21-32
Numero di pagine12
RivistaHydrobiologia
Stato di pubblicazionePublished - 2017

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Branchiopoda
shrimp
provincialism
local adaptation
phylogeography
habitat
vigor
cyst
aquatic organism
buffering
genetic differentiation
outbreeding
genetic variation
homogeneity
gene flow
antenna
connectivity
discontinuity
aquatic organisms
genotype

All Science Journal Classification (ASJC) codes

  • Aquatic Science

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Molecular and morphological data suggest weak phylogeographic structure in the fairy shrimp Streptocephalus torvicornis (Branchiopoda, Anostraca). / Marrone, Federico; Alfonso, Giuseppe; Alonso, Miguel; Synefiaridou, Dimitra; Kappas, Ilias; Abatzopoulos, Theodore J.; Mura, Graziella.

In: Hydrobiologia, 2017, pag. 21-32.

Risultato della ricerca: Article

Marrone, Federico ; Alfonso, Giuseppe ; Alonso, Miguel ; Synefiaridou, Dimitra ; Kappas, Ilias ; Abatzopoulos, Theodore J. ; Mura, Graziella. / Molecular and morphological data suggest weak phylogeographic structure in the fairy shrimp Streptocephalus torvicornis (Branchiopoda, Anostraca). In: Hydrobiologia. 2017 ; pagg. 21-32.
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AU - Marrone, Federico

AU - Alfonso, Giuseppe

AU - Alonso, Miguel

AU - Synefiaridou, Dimitra

AU - Kappas, Ilias

AU - Abatzopoulos, Theodore J.

AU - Mura, Graziella

PY - 2017

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N2 - Inland aquatic organisms almost ubiquitously display a pattern of marked provincialism characterized by substantial population differentiation and genealogical discontinuities. This is the result of strong priority effects and local adaptation following dispersal and colonization of new habitats. We present a case that defies this biogeographic paradigm. We have investigated the phylogeography of the fairy shrimp Streptocephalus torvicornis across its circum-Mediterranean and Eurasian distribution. Based on three independent datasets, namely sequence variation at 12S and 16S rRNA, cyst morphology and male second antenna characters, we discern a pattern of extensive genetic and morphological homogeneity pointing to unhindered gene flow and widespread connectivity among populations. These intriguing findings may provisionally be explained by (i) a high dispersal frequency overwhelming the ability of a population to maintain resource monopolization, (ii) an outbreeding vigour opportunity offered to secondary immigrants, (iii) an ecological equivalence of genotypes generating long-term immigration–extinction equilibria and buffering genetic diversity over spatial scales, (iv) enhanced bird-mediated dispersal in open habitats as opposed to ponds surrounded by forests or shrub, or (v) a shallow population history with little time for substantial genetic differentiation.

AB - Inland aquatic organisms almost ubiquitously display a pattern of marked provincialism characterized by substantial population differentiation and genealogical discontinuities. This is the result of strong priority effects and local adaptation following dispersal and colonization of new habitats. We present a case that defies this biogeographic paradigm. We have investigated the phylogeography of the fairy shrimp Streptocephalus torvicornis across its circum-Mediterranean and Eurasian distribution. Based on three independent datasets, namely sequence variation at 12S and 16S rRNA, cyst morphology and male second antenna characters, we discern a pattern of extensive genetic and morphological homogeneity pointing to unhindered gene flow and widespread connectivity among populations. These intriguing findings may provisionally be explained by (i) a high dispersal frequency overwhelming the ability of a population to maintain resource monopolization, (ii) an outbreeding vigour opportunity offered to secondary immigrants, (iii) an ecological equivalence of genotypes generating long-term immigration–extinction equilibria and buffering genetic diversity over spatial scales, (iv) enhanced bird-mediated dispersal in open habitats as opposed to ponds surrounded by forests or shrub, or (v) a shallow population history with little time for substantial genetic differentiation.

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