Ketil Sand's research while affiliated with University of Oslo and other places
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Publications (2)
The life cycle of the widely distributed mayfly, Baetis rhodani, was investigated in Øvre Heimdalen, in the Jotunheimen Mountains of central southern Norway. B. rhodani displayed a shift in life cycle from univoltine below the lake, Øvre Heimdalsvatn (1090 m a.s.l.) to a two-year life cycle in the inflowing stream, Brurskardbekken (1100–1300 m a.s....
Egg development of Dinocras cephalotes (Curtis) was studied in a population from the Jotunheimen Mountains of central southern Norway. At 16, 20 and 24 °C hatching success was >50%, while at 12 °C only a few eggs hatched. The number of degree days required for hatching was less, but the lower threshold temperature for development was higher than fo...
Citations
... Species are characterised by a large set of biological traits, many of which form during their evolutionary history and control their occurrence in habitats. Labile traits are those that are not constrained by phylogeny and that are supposed to respond directly to the environment through local adaptation or phenotypic plasticity (Roff 2002;Verberk et al. 2013). The expression of such traits changes if the environment changes from one location to another (i.e., individuals of the same species inhabiting different environmental conditions will have different traits) or over time (i.e., traits vary with the individual's ontogeny) (Nussey et al. 2007). ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/272498897977373-1441980208941_Q64/J-Brittain.jpg)
... B. rhodani applies a feeding strategy that combines grazing/scraping with gathering/collecting. The larvae feed predominantly on fine detritus and algae [24,25]. B. rhodani has a flexible life cycle strategy and produces a variable number of generations per year depending on environmental conditions, such as water temperature and food availability [25]. ...
