Limits...
Genetic data from algae sedimentary DNA reflect the influence of environment over geography.

Stoof-Leichsenring KR, Herzschuh U, Pestryakova LA, Klemm J, Epp LS, Tiedemann R - Sci Rep (2015)

Bottom Line: Here, we investigate the relatedness of diatom lineages in Siberian lakes along environmental gradients (i.e. across treeline transects), over geographic distance and through time (i.e. the last 7000 years) using modern and ancient sedimentary DNA.Thus our study reveals that environmental conditions rather than geographic distance is reflected by diatom-relatedness patterns in space and time.We tentatively speculate that the detected relatedness pattern in Staurosira across the treeline could be a result of adaptation to diverse environmental conditions across the arctic boreal treeline, however, a geographically-driven divergence and subsequent repopulation of ecologically different habitats might also be a potential explanation for the observed pattern.

View Article: PubMed Central - PubMed

Affiliation: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Periglacial Research, Telegrafenberg A43, 14473 Potsdam, Germany.

ABSTRACT
Genetic investigations on eukaryotic plankton confirmed the existence of modern biogeographic patterns, but analyses of palaeoecological data exploring the temporal variability of these patterns have rarely been presented. Ancient sedimentary DNA proved suitable for investigations of past assemblage turnover in the course of environmental change, but genetic relatedness of the identified lineages has not yet been undertaken. Here, we investigate the relatedness of diatom lineages in Siberian lakes along environmental gradients (i.e. across treeline transects), over geographic distance and through time (i.e. the last 7000 years) using modern and ancient sedimentary DNA. Our results indicate that closely-related Staurosira lineages occur in similar environments and less-related lineages in dissimilar environments, in our case different vegetation and co-varying climatic and limnic variables across treeline transects. Thus our study reveals that environmental conditions rather than geographic distance is reflected by diatom-relatedness patterns in space and time. We tentatively speculate that the detected relatedness pattern in Staurosira across the treeline could be a result of adaptation to diverse environmental conditions across the arctic boreal treeline, however, a geographically-driven divergence and subsequent repopulation of ecologically different habitats might also be a potential explanation for the observed pattern.

No MeSH data available.


Related in: MedlinePlus

Study area in Siberia, Northern Russia.Black dots indicate the sampling sites of surface sediments and the red triangle indicates the position of the sediment core 11-CH-12A. This map was created with Esri Arc GIS Version 10.2.
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f1: Study area in Siberia, Northern Russia.Black dots indicate the sampling sites of surface sediments and the red triangle indicates the position of the sediment core 11-CH-12A. This map was created with Esri Arc GIS Version 10.2.

Mentions: The geographic positions of the surveyed lakes across the Siberian treeline and the coring locality are mapped in Fig. 1. Their physical and hydrochemical characteristics and vegetation-based parameters are given in Table 1.


Genetic data from algae sedimentary DNA reflect the influence of environment over geography.

Stoof-Leichsenring KR, Herzschuh U, Pestryakova LA, Klemm J, Epp LS, Tiedemann R - Sci Rep (2015)

Study area in Siberia, Northern Russia.Black dots indicate the sampling sites of surface sediments and the red triangle indicates the position of the sediment core 11-CH-12A. This map was created with Esri Arc GIS Version 10.2.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4542542&req=5

f1: Study area in Siberia, Northern Russia.Black dots indicate the sampling sites of surface sediments and the red triangle indicates the position of the sediment core 11-CH-12A. This map was created with Esri Arc GIS Version 10.2.
Mentions: The geographic positions of the surveyed lakes across the Siberian treeline and the coring locality are mapped in Fig. 1. Their physical and hydrochemical characteristics and vegetation-based parameters are given in Table 1.

Bottom Line: Here, we investigate the relatedness of diatom lineages in Siberian lakes along environmental gradients (i.e. across treeline transects), over geographic distance and through time (i.e. the last 7000 years) using modern and ancient sedimentary DNA.Thus our study reveals that environmental conditions rather than geographic distance is reflected by diatom-relatedness patterns in space and time.We tentatively speculate that the detected relatedness pattern in Staurosira across the treeline could be a result of adaptation to diverse environmental conditions across the arctic boreal treeline, however, a geographically-driven divergence and subsequent repopulation of ecologically different habitats might also be a potential explanation for the observed pattern.

View Article: PubMed Central - PubMed

Affiliation: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Periglacial Research, Telegrafenberg A43, 14473 Potsdam, Germany.

ABSTRACT
Genetic investigations on eukaryotic plankton confirmed the existence of modern biogeographic patterns, but analyses of palaeoecological data exploring the temporal variability of these patterns have rarely been presented. Ancient sedimentary DNA proved suitable for investigations of past assemblage turnover in the course of environmental change, but genetic relatedness of the identified lineages has not yet been undertaken. Here, we investigate the relatedness of diatom lineages in Siberian lakes along environmental gradients (i.e. across treeline transects), over geographic distance and through time (i.e. the last 7000 years) using modern and ancient sedimentary DNA. Our results indicate that closely-related Staurosira lineages occur in similar environments and less-related lineages in dissimilar environments, in our case different vegetation and co-varying climatic and limnic variables across treeline transects. Thus our study reveals that environmental conditions rather than geographic distance is reflected by diatom-relatedness patterns in space and time. We tentatively speculate that the detected relatedness pattern in Staurosira across the treeline could be a result of adaptation to diverse environmental conditions across the arctic boreal treeline, however, a geographically-driven divergence and subsequent repopulation of ecologically different habitats might also be a potential explanation for the observed pattern.

No MeSH data available.


Related in: MedlinePlus