Littorina littorea's tilpasning til græsning på Gracilaria vermiculophylla

Anders Mebus Laustsen, Niels Gudmand Christiansen & Rasmus Bondesen

Studenteropgave: Fagmodulprojekt

Abstrakt


This paper aims to test adaptation of the gastropod L. littorea ability to graze on the invasive macro algae G. vermiculophylla when it is introduced to its environment. This is achieved by grazing experiments where gastropods from different areas of Denmark are given G. vermiculophylla and the native macro algae F. vesiculosus. The locations from which L. littorea are sampled is chosen based on presence of G. vermiculophylla such that gastropods that have been in the presence of the invasive species can be compared to those that have not. L. littorea seems to be able to graze on both algae with the same preference for both the selected populations. The gastropod shows no signs of adaptation when introduced to G. vermiculophylla as the population not introduced to the invasive macro algae seems to have a higher grazing rate on G. vermiculophylla than the population previously introduced to the algae. The grazing rates show high variance which may hide potential grazing preferences of L. littorea. To get better results a higher grazer biomass than the one used is recommended.

UddannelserBasis - Naturvidenskabelig Bacheloruddannelse, (Bachelor uddannelse) Basis
SprogDansk
Udgivelsesdato27 maj 2019
Antal sider14

Emneord

  • Littorina littorea