Líffræðifélag Íslands - biologia.is
Líffræðiráðstefnan 2021
Erindi/veggspjald / Talk/poster V31
Höfundar / Authors: Fia Finn (1), Haraldur R. Ingvason (2) , Finnur Ingimarsson (3) Gustav Hellström (4), Tomas Brodin (5) Kalina Kapralova (6)
Starfsvettvangur / Affiliations: University of Iceland
Kynnir / Presenter: Fia Finn
The aim of our our study is to collect movement data over three years from Arctic charr and the Brown Trout in Lake Thingvallavatn using acoustic telemetry. We will surgically implant a tag in the abdominal cavity of the animal that actively transmits acoustic signals every 120 seconds, with information about I.D. of the individual as well as temperature and specific position, to fixed receivers placed strategically in its habitat. In year one we are tagging 20 individuals of each morph as well as 20 brown trout. The small benthic and the planktivorous morph will be fitted with VEMCOs V7, 18mm, tag weighing only 0.7 grams in water. The large benthic and the piscivorous morphs will be fitted with the V9 (26,1mm, 2,0g). For the Brown trout we will use the larger V13 (46mm, 6,3g) and V16 (71mm, 11,7). Projected battery life for the tags range from 220 days for the V7s to 3650 days for the V16s. 40 receivers will be placed in an even grid throughout the lake to collect presence/absence data. Using the results from the first year we will focus in on the feeding grounds and 3-D position the individuals and thereby track individual behaviour on a finer scale. The third year we will put the same focus on the spawning grounds. This data will be organized in a database with accessibility for other research groups and institutions to address ecological, evolutionary and conservation questions.