Biodiversity of the baltic postglacial ecosystems changes in time and space
Download
1 / 27

Biodiversity - PowerPoint PPT Presentation


  • 247 Views
  • Updated On :

Biodiversity of the Baltic postglacial ecosystems: CHANGES IN TIME AND SPACE. Vytautas Kontrimavičius Lithuanian Academy of Sciences. Pleistocene glaciations in the northern hemisphere. The gray areas represent ice shields.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Biodiversity ' - Michelle


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Biodiversity of the baltic postglacial ecosystems changes in time and space l.jpg

Biodiversity of the Baltic postglacial ecosystems:CHANGES IN TIME AND SPACE

Vytautas Kontrimavičius

Lithuanian Academy of Sciences


Pleistocene glaciations in the northern hemisphere l.jpg
Pleistocene glaciations in the northern hemisphere

The gray areas represent ice shields


Approximate appearance of bering land bridge during late pleistocene time after rausch 1994 l.jpg
Approximate appearance of Bering Land Bridge during late Pleistocene time (after Rausch, 1994)

The white areas – land

The dotted areas – ice


Eastern palearctic biodiversity l.jpg
Eastern Palearctic Biodiversity Pleistocene time

  • Ecosystems of the Eastern Palearctic

    • have not been covered with Pleistocene glaciations

    • therefore their biodiversity is much higher than biodiversity of the Western Palearctic (including European)ecosystems


We stern palearctic biodiversity l.jpg
We Pleistocene time stern Palearctic Biodiversity

  • Postglacial ecosystems of Western Palearctic

    • are relatively species-poor

    • are formed continuously up to now due to

      • natural expansion of species ranges

      • anthropogenic transfer


Baltic biodiversity l.jpg
Baltic Pleistocene time Biodiversity

  • Feature of ecosystems of the Baltic region:

    • south-western distribution limit of northern and Siberian species of Taigaand Tundra biomes

    • north-eastern distribution limit of Western-European species of deciduous forest biome


Slide7 l.jpg

The tundra birch Pleistocene time

(Betula nana)

European

hornbeam

(Carpinus betulus)


Slide8 l.jpg

Cloudberry Pleistocene time

(Rubus chamaemorus)

Mistletoe

(Viscum album)


Slide9 l.jpg

Fat dormouse Pleistocene time (Glis glis)

Mountain hare (Lepus timidus)


Slide10 l.jpg

Pond turtle ( Pleistocene time Emys orbicularis)

Tree frog (Hylaarborea)

Whitefish:

Coregonus lavaretus

Coregonus albula


Baltic biodiversity11 l.jpg
Baltic Pleistocene time Biodiversity

  • Combination of northern and southern species in ecosystems

    • increases their stability in variable seasonal climate

      however

    • may cause large-scale changes (extinctions, migrations) in case of long-term climate change


Baltic biodiversity12 l.jpg
Baltic Pleistocene time Biodiversity

  • Molecular methods in ecology provided the new possibilities:

    • study of ecosystem structure

    • study of population structure within species

  • They revealed the genetic heterogeneity of populations in the Baltic region


Slide16 l.jpg

Southern Pleistocene time

Western

Eastern

Microtus agrestis sampling sites


Slide17 l.jpg

Microtus agrestis Pleistocene time postglacial expansion


Slide18 l.jpg

Lithuania Pleistocene time

Eastern

Lithuania

Western

Southern

Microtus agrestis

similarity of populations


Baltic biodiversity20 l.jpg
Baltic Pleistocene time Biodiversity

  • The listed data on the population structure of the Baltic region seem to be the only available up to now.

  • Therefore, the Baltic region of Europe remains one of the least researched in the aspect of phylogeography


Baltic biodiversity21 l.jpg
Baltic Pleistocene time Biodiversity

  • The latest data

    • disprove the hypothesis of Hewitt (1999) that the postglacial biota of Europe has been mainly formed by the populations of the southern refugia

    • reveal that the northern Europe, including the Baltic region, has been colonized by migration from remote eastern populations of southern Siberia


Slide22 l.jpg

Molecular ecology Pleistocene time

  • The questions solved by the molecular ecology:

    • Population structure

    • Genetic divergence

    • Hybrid zones

    • Speciation

    • Sibling species

    • Intraspecific systematics

  • They all are questions of biodiversity


Molecular ecology l.jpg
Molecular ecology Pleistocene time

  • Most intensive research conducted during last 15 years. Publications:

    • Molecular Ecology

    • Molecular Biology and Evolution

    • Molecular Phylogenetics and Evolution

    • Genetics

    • Molekulyarnaya Biologiya

      etc.


Molecular ecology24 l.jpg
Molecular ecology Pleistocene time

  • In Lithuania, there were little possibilities to conduct molecular ecology research due to economic reasons,

    however, recently


Molecular ecology in lithuania l.jpg
Molecular ecology Pleistocene time in Lithuania

  • a laboratory of molecular ecology has been equipped in the Institute of Ecologyof Vilnius University

  • a field material has been collected for the phylogeographic studies of

    • Protista

    • Vermes

    • Mollusca

    • Insecta

    • Aves

    • Mammalia


Molecular ecology in lithuania26 l.jpg
Molecular ecology Pleistocene time in Lithuania

  • The main research trends:

    • structure of populations

    • intra-specific hybrid zones

    • significance of the European and Siberian refugia in the formation of post-glacial biota of Northern Europe


Slide27 l.jpg

Thank you for attention! Pleistocene time


ad