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Dispersive trait expression of Asellus aquaticus from a rare cave habitat
Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska fakulteten.
2016 (engelsk)Independent thesis Advanced level (degree of Master (Two Years)), 40 poäng / 60 hpOppgave
Abstract [en]

Dispersal influences several ecological and evolutionary processes, such as intraspecific competition, genetic drift and inbreeding. It can lead to phenotypic mismatch with the habitat when a locally adapted individual winds up in an environment with a divergent selection regime compared to the source habitat. The aim of this project was to compare dispersive traits in the freshwater isopod Asellus aquaticus from a cave habitat, with surface dwelling isopods collected upstream and downstream from the cave system. The subterranean stream (cave) represents a rare, geographically limited habitat which has a divergent selective pressure compared to the surrounding habitats. Experiments on dispersal were performed in the laboratory, in darkness with IR-equipment for visualization. Displacement was measured using one-dimensional test arenas. Compared to the surface phenotype, the cave phenotype was expected to have reduced fitness outside of the cave and unlikely to successfully disperse to new areas of similar suitable conditions. The results did not follow my main hypothesis that isopods from the cave would be less dispersive than individuals from the surface. The inconclusive results might derive from large variation in the data and divergent adaptations which yield similar expression of dispersal.

sted, utgiver, år, opplag, sider
2016. , s. 39
Emneord [en]
dispersal, dispersive traits, local adaptation, rare habitats, Asellus aquaticus
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-129135ISRN: LITH-IFM-A-EX--16/3218--SEOAI: oai:DiVA.org:liu-129135DiVA, id: diva2:935904
Fag / kurs
Biology
Presentation
2016-05-27, E324 Schrödinger, Linköpings universitet 581 83, Linköping, 11:30 (engelsk)
Veileder
Examiner
Tilgjengelig fra: 2016-06-14 Laget: 2016-06-13 Sist oppdatert: 2016-06-16bibliografisk kontrollert

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Dispersive trait expression of Asellus aquaticus from a rare cave habitat(1443 kB)195 nedlastinger
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