Lake morphometry and occurrence sticklebacks are the main drivers of size and age structure of arctic charr Salvelinus alpinus in west Greenland lakes

Date

2016-08-05

Author

Arranz, Ignasi
Benejam, Llus
Brucet, Sandra
Landkildehus, Frank
Lauridsen, Torben
Davidson, Thomas
Mazzeo, Nestor
Gonzalesbergonzoni, Ivan
Vidal, Nikolas
Özkan, Korhan
Gallego, Irene
Weschnewski, Juliane
Menezes, Rosemberg
Jeppesen, Erik

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Greenland lakes are suitable model systems for evaluating fish population structure because of their relatively low species diversity and simple food web structure. Arctic charr (Salvelinus alpinus) mostly occur in these low-density systems, co-occurring with three-spined sticklebacks (Gasterosteus aculeatus). We aim at exploring the size and age structure of populations of Arctic charr across 17 West Greenland lakes, by also accounting for the effect of anadromy (i.e. migration of fish, from salt water to freshwater) and the presence of dwarf individuals of charr. The lakes hosted either a solitary population of Arctic charr or co-occurring charr and three-spined sticklebacks. Hence, these arctic systems provided a unique opportunity to study the influence of sticklebacks on the fish condition and habitat distribution of charr populations. Furthermore, as the lakes covered a wide range of areas and depths, we also searched for possible morphometric effects on two sympatric morphotypes of Arctic charr. The trophic niche use of sticklebacks and lake morphometry as well as the effects of intraspecific interactions with anadromous and dwarfs charrs may become the most important causes to regulate the population structure of Arctic charr in Greenland lakes. Finally, we will also discuss the implications of the changes in charr population structure in the context of the climate warming.

URI

https://hdl.handle.net/11511/85861

Conference Name

33rd SIL Congreeess, (31 Temmuz - 05 Ağustos 2016)

Collections

Graduate School of Marine Sciences, Conference / Seminar

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Citation Formats

I. Arranz et al., “Lake morphometry and occurrence sticklebacks are the main drivers of size and age structure of arctic charr Salvelinus alpinus in west Greenland lakes,” presented at the 33rd SIL Congreeess, (31 Temmuz - 05 Ağustos 2016), Torino, Italy, 2016, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/85861.