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Speciation Progress: A Case Study on the Bushcricket Poecilimon veluchianus.

Eweleit L, Reinhold K, Sauer J - PLoS ONE (2015)

Bottom Line: The two subspecies of Poecilimon veluchianus, a bushcricket endemic to central Greece, show a parapatric distribution and are partially reproductively isolated.Furthermore, we could identify isolation by distance (IBD) as one important mechanism responsible for the observed genetic structure (based on the ITS marker).Furthermore, the simultaneous lack of strong prezygotic barriers and the presence of postzygotic mating barriers, observed in previous laboratory experiments, suggest that a secondary contact after an allopatric phase is more likely than parapatric speciation.

View Article: PubMed Central - PubMed

Affiliation: Department of Evolutionary Biology, Bielefeld University, Bielefeld, Germany.

ABSTRACT
Different mechanisms such as selection or genetic drift permitted e.g. by geographical isolation can lead to differentiation of populations and could cause subsequent speciation. The two subspecies of Poecilimon veluchianus, a bushcricket endemic to central Greece, show a parapatric distribution and are partially reproductively isolated. Therefore, P. veluchianus is suitable to investigate an ongoing speciation process. We based our analysis on sequences of the internal transcribed spacer (ITS) and the mitochondrial control region (CR). The population genetic analysis based on the nuclear marker ITS revealed a barrier to gene flow within the range of Poecilimon veluchianus, which corresponds well to the described subspecies. In contrast to the results based on the nuclear ITS marker, the mitochondrial CR marker does not clearly support the separation into two subspecies with restricted gene flow and a clear contact zone. Furthermore, we could identify isolation by distance (IBD) as one important mechanism responsible for the observed genetic structure (based on the ITS marker). The population genetic analysis based on the nuclear marker ITS also suggests the existence of hybrids in the wild. Furthermore, the simultaneous lack of strong prezygotic barriers and the presence of postzygotic mating barriers, observed in previous laboratory experiments, suggest that a secondary contact after an allopatric phase is more likely than parapatric speciation.

No MeSH data available.


Related in: MedlinePlus

Sampling locations in Central Greece for P. v. veluchianus (left side, open circles) and P. v. minor (right side, filled circles) with hypothesized contact zone (dashed line).The Map was prepared in DIVA-GIS version 7.5.0.0 using an elevation shapefile freely available at https://research.cip.cgiar.org/gis/.
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pone.0139494.g001: Sampling locations in Central Greece for P. v. veluchianus (left side, open circles) and P. v. minor (right side, filled circles) with hypothesized contact zone (dashed line).The Map was prepared in DIVA-GIS version 7.5.0.0 using an elevation shapefile freely available at https://research.cip.cgiar.org/gis/.

Mentions: We chose Poecilimon veluchianus, a flightless bushcricket, which is endemic to central Greece, as a promising system to investigate forces that could drive speciation. The two subspecies, P. v. veluchianus and P. v. minor [9], are described based on significant differences in body size and behavioral traits like sperm transfer rate and signaling duration per day [9,10]. Size differences were found between several populations, and were confirmed for almost the entire distribution range [11], whereas the behavioral differences were observed in a one population comparison close to Vitoli in central Greece (sample sites 08 and 17 in Fig 1) [10]. The two subspecies are parapatrically distributed with a V-shaped contact zone (Fig 1) within central Greece [9,11].


Speciation Progress: A Case Study on the Bushcricket Poecilimon veluchianus.

Eweleit L, Reinhold K, Sauer J - PLoS ONE (2015)

Sampling locations in Central Greece for P. v. veluchianus (left side, open circles) and P. v. minor (right side, filled circles) with hypothesized contact zone (dashed line).The Map was prepared in DIVA-GIS version 7.5.0.0 using an elevation shapefile freely available at https://research.cip.cgiar.org/gis/.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4593647&req=5

pone.0139494.g001: Sampling locations in Central Greece for P. v. veluchianus (left side, open circles) and P. v. minor (right side, filled circles) with hypothesized contact zone (dashed line).The Map was prepared in DIVA-GIS version 7.5.0.0 using an elevation shapefile freely available at https://research.cip.cgiar.org/gis/.
Mentions: We chose Poecilimon veluchianus, a flightless bushcricket, which is endemic to central Greece, as a promising system to investigate forces that could drive speciation. The two subspecies, P. v. veluchianus and P. v. minor [9], are described based on significant differences in body size and behavioral traits like sperm transfer rate and signaling duration per day [9,10]. Size differences were found between several populations, and were confirmed for almost the entire distribution range [11], whereas the behavioral differences were observed in a one population comparison close to Vitoli in central Greece (sample sites 08 and 17 in Fig 1) [10]. The two subspecies are parapatrically distributed with a V-shaped contact zone (Fig 1) within central Greece [9,11].

Bottom Line: The two subspecies of Poecilimon veluchianus, a bushcricket endemic to central Greece, show a parapatric distribution and are partially reproductively isolated.Furthermore, we could identify isolation by distance (IBD) as one important mechanism responsible for the observed genetic structure (based on the ITS marker).Furthermore, the simultaneous lack of strong prezygotic barriers and the presence of postzygotic mating barriers, observed in previous laboratory experiments, suggest that a secondary contact after an allopatric phase is more likely than parapatric speciation.

View Article: PubMed Central - PubMed

Affiliation: Department of Evolutionary Biology, Bielefeld University, Bielefeld, Germany.

ABSTRACT
Different mechanisms such as selection or genetic drift permitted e.g. by geographical isolation can lead to differentiation of populations and could cause subsequent speciation. The two subspecies of Poecilimon veluchianus, a bushcricket endemic to central Greece, show a parapatric distribution and are partially reproductively isolated. Therefore, P. veluchianus is suitable to investigate an ongoing speciation process. We based our analysis on sequences of the internal transcribed spacer (ITS) and the mitochondrial control region (CR). The population genetic analysis based on the nuclear marker ITS revealed a barrier to gene flow within the range of Poecilimon veluchianus, which corresponds well to the described subspecies. In contrast to the results based on the nuclear ITS marker, the mitochondrial CR marker does not clearly support the separation into two subspecies with restricted gene flow and a clear contact zone. Furthermore, we could identify isolation by distance (IBD) as one important mechanism responsible for the observed genetic structure (based on the ITS marker). The population genetic analysis based on the nuclear marker ITS also suggests the existence of hybrids in the wild. Furthermore, the simultaneous lack of strong prezygotic barriers and the presence of postzygotic mating barriers, observed in previous laboratory experiments, suggest that a secondary contact after an allopatric phase is more likely than parapatric speciation.

No MeSH data available.


Related in: MedlinePlus