IGV Research Seminar/PhD research seminar

Seminar

Date: Thursday 4 December 2025

Time: 15.00 – 16.00

Location: William-Olsson lecture hall, Geohuset

by Ernst Johnson, PhD student at Centre for Palaeogenetics/Department of Geological Sciences, Stockholm University

Tracing the Pioneers of Scandinavia: drawing inferences from ancient environmental genomics

The postglacial recolonization of Fennoscandian flora and fauna was initiated when the land became accessible as the last ice sheet retreated. In northern Sweden, plants are represented in pollen and macrofossil records, but there is no genetic evidence from the first plants, animals or humans in the region, mainly owing to an absence of osteological finds. Previous restraints due to gaps in the fossil record are now being addressed as the use of environmental ancient DNA (aeDNA) is emerging as a powerful tool for reconstructing past ecosystems. Molecular traces of species stored in palaeoarchives, such as lake sediments, can far exceed the preservation of macrofossils, allowing for better spatiotemporal resolution beyond presence or absence. Incorporating genomic gata further enables differentiation between populations which can illuminate recolonisation patterns.

In this seminar, two different case studies from early Holocene northern Sweden will be presented along with the approaches used to reach our conclusions.

Ernst Johnson Seminar (275 Kb)

Theme

Last updated: November 3, 2025

Source: Department of Geological Sciences

eventNewsArticle

standard-article

true

{
  "dimensions": [
    {
      "id": "department.categorydimension.subject",
      "name": "Global categories",
      "enumerable": true,
      "entities": [],
      "localizations": {}
    },
    {
      "id": "department.categorydimension.tag.Keywords",
      "name": "Keywords",
      "enumerable": false,
      "entities": [],
      "localizations": {}
    },
    {
      "id": "department.categorydimension.tag.Person",
      "name": "Person",
      "enumerable": false,
      "entities": [],
      "localizations": {}
    },
    {
      "id": "department.categorydimension.tag.Tag",
      "name": "Tag",
      "enumerable": false,
      "entities": [],
      "localizations": {}
    },
    {
      "id": "localcategorytree.su.se.english",
      "name": "Local categories for www.su.se/english",
      "enumerable": true,
      "entities": [],
      "localizations": {}
    },
    {
      "id": "webb2021.categorydimension.Category.Events",
      "name": "Event Category (Webb 2021)",
      "enumerable": true,
      "entities": [
        {
          "id": "webb2021.categorydimension.Category.Events.research",
          "name": "Research",
          "entities": [],
          "attributes": [],
          "childrenOmitted": false,
          "localizations": {}
        },
        {
          "id": "webb2021.categorydimension.Category.Events.education",
          "name": "Education",
          "entities": [],
          "attributes": [],
          "childrenOmitted": false,
          "localizations": {}
        },
        {
          "id": "webb2021.categorydimension.Category.Events.research.catalogue.en",
          "name": "Research catalogue",
          "entities": [],
          "attributes": [],
          "childrenOmitted": false,
          "localizations": {}
        }
      ],
      "localizations": {}
    },
    {
      "id": "webb2021.categorydimension.Label",
      "name": "Etiketter (Webb 2021)",
      "enumerable": true,
      "entities": [],
      "localizations": {}
    },
    {
      "id": "webb2021.categorydimension.Label.en",
      "name": "Labels (Webb 2021)",
      "enumerable": true,
      "entities": [
        {
          "id": "webb2021.categorydimension.Label.en.geology_geography_landscapes",
          "name": "Geology, Geography and Landscapes",
          "entities": [],
          "attributes": [],
          "childrenOmitted": false,
          "localizations": {}
        },
        {
          "id": "webb2021.categorydimension.Label.en.DNA",
          "name": "DNA Research",
          "entities": [],
          "attributes": [],
          "childrenOmitted": false,
          "localizations": {}
        },
        {
          "id": "webb2021.categorydimension.Label.en.OceansLakes\u003c",
          "name": "Oceans and Lakes",
          "entities": [],
          "attributes": [],
          "childrenOmitted": false,
          "localizations": {}
        }
      ],
      "localizations": {}
    },
    {
      "id": "webb2021.categorydimension.Keyword",
      "name": "Keywords (Webb 2021)",
      "enumerable": false,
      "entities": [],
      "localizations": {}
    }
  ]
}