Search
Now showing items 1-5 of 5
Resource Partitioning in Food, Space and Time between Arctic Charr (Salvelinus alpinus), Brown Trout (Salmo trutta) and European Whitefish (Coregonus lavaretus) at the Southern Edge of Their Continuous Coexistence
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017)
Arctic charr and European whitefish are considered to be strong competitors in lakes, with the latter usually being the superior species. However, high niche plasticity and lake morphometry may suggestively facilitate resource partitioning and coexistence between charr and whitefish. Here, we explore the trophic niche utilization (diet and habitat use) of charr and whitefish co-occurring with brown ...
Trophic niche similarity among sea trout Salmo trutta in Central Norway investigated using different time-integrated trophic tracers
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-21)
From 2011 to 2013, anadromous brown trout Salmo trutta (213−730 mm, total body
length, LT) were collected during or shortly after their marine feeding migration at 7 different
localities in central Norway. The mean volume of stomach content (%) of marine fish prey eaten
by S. trutta captured in marine waters varied from 34 to 89%. There was a high prevalence
(67−100%) for parasite groups potentially ...
Allometric trajectories of body and head morphology in three sympatric Arctic charr (Salvelinus alpinus (L.)) morphs
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-08-08)
A study of body and head development in three sympatric reproductively isolated Arctic charr (Salvelinus alpinus (L.)) morphs from a subarctic lake (Skogsfjordvatn, northern Norway) revealed allometric trajectories that resulted in morphological differences. The three morphs were ecologically assigned to a littoral omnivore, a profundal benthivore and a profundal piscivore, and this was confirmed ...
The trade-off between fecundity and egg size in a polymorphic population of Arctic charr (Salvelinus alpinus (L.)) in Skogsfjordvatn, subarctic Norway
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-02-26)
Reproductive traits differ between intralacustrine Arctic charr morphs. Here, we ex
-
amine three sympatric lacustrine Arctic charr morphs with respect to fecundity, egg
size and spawning time/site to assess reproductive investments and trade-
offs, and
possible fitness consequences. The littoral omnivore morph (LO-
morph) utilizes the
upper water for feeding and reproduction and spawn ...
Molecular analyses reveal high cryptic diversity of trematodes in a sub-Arctic lake
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-03-14)
To identify trematode diversity and life-cycles in the sub-Arctic Lake Takvatn, Norway, we characterised
120 trematode isolates from mollusc first intermediate hosts, metacercariae from second intermediate
host fishes and invertebrates, and adults from fish and invertebrate definitive hosts, using molecular
techniques. Phylogenies based on nuclear and/or mtDNA revealed high species richness (24 ...