Líffræðifélag Íslands - biologia.is
Líffræðiráðstefnan 2023
Höfundar / Authors: Gísli Már Gíslason, Snæbjörn Pálsson
Starfsvettvangur / Affiliations: Institute Life and Environmental Science, Askja – Natural Science Building, University of Iceland, Askja, IS-101 Reykjavik, Iceland
Kynnir / Presenter: Gísli Már Gíslason
Analysis of geographic variation in the COI mtDNA barcode marker in ten of the Trichoptera species from Iceland indicates distinct histories where different species show indication of varying time since colonization of the island and separate evolution restricted to Iceland. One of the three Holarctic species, the parthenogenic Apatania zonella, appears to have originate near the Bearing Strait and dispersed from there west to Scandinavia, where another route was east N-America to Greenland and the populations met more recently in Iceland. The other two, L. fenestratus and L. picturatus do not show a clear split between the Nearctic and Palearctic, but the former has been poorly sampled. Three of the palearctic species L. affinis, L. griseus, L. sparsus present unique lineages within Iceland, suggesting an early colonizers after the Ice-age, the poorly sampled L. elegans shows also an indication of divergence restricted to Iceland. Variation within the three other species reflect a recent origin. Potamophylax cingulatus originates in Central Europe and its variation reflects a migration route west to France and then north the coast to Britain and finally to Iceland in the 20th century. Similarly L. decipiens and Microptsectra sequax, a very recent colonizer (21st century) fall genetically in with other European species, both in Scandinavia and central Europe. No information on the DNA is available for the Icelandic Agrypnia picta and Grammotaulius nigropunctatus.