HOLMFR~DUR SIGURDARDOTTIR

• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Sav’; Surtsey
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.614.4204; http://www.surtsey.is/SRS_publ/2000-XI/2000_XII_2_06.pdf

The distribution of collembolalls was studied in plots of five different plant successional stages outside and inside the gull cololly on Surtsey in 1995. Six species of collembolalls were found, three of them new to the island. The dolninant species were ~Uesr~pho~zrl-a?n crocAaeta outside the colo~ly and H)lj~ogast~zira puipu~esceizs inside it. In sparsely vegetated areas outside the gull colo~ly 0- 935 individuals m 2 of colle~nbola~s were found on the average but in the Inore developed grass swards inside the colony the density was much higher or 17,680- 74,724 illdividuals m2. The total C and N levels of the soil in the gull cololly were higher than in plots outside the colony. The gull colony on Surtsey with its nutrient enrichment has had an impact on the development of the soil fauna. In 1993 the first earthworms were found on Surtsey when isvo juveililes of the species L Z L I ~ ~ I ~ C Z L S castoneus (Sav.) were extracted froin soil samples taken in the gull colony. In spite of a thorough search and sa~npling on the island in 1995 earthworms were not reencountered.