Report : setinfo

RESPONDENT
Lauri Oksanen

SITE NAME
Joatkanj rvri-Ies vri, Norway

Contact details (phone/fax//e-mail//address):
(35881)5531526/(35881)5531500 // Lauri.Oksanen@oulu.fi // Biol. Inst. Oulunyliopisto FIN-90570 Oulu, Finland

PROJECT DETAILS

Project name:

Start of survey:	End of survey:	Team size:
		10

WEATHER CONDITIONS

Season phenology:

Weather conditions:

Snow cover is thin and snow normally melts in a few days, so 4.2 and 4.4 are almost the same. June is very variable - anything from a blizzard to +30^C & continious sunshine. July is more stable, but can be rainy, temperature vary from +5^C to +30^C, normally about +10C to +15C. August again variable, but rainy. SW1: Sunny and dry in June, wet and windy in July, and very wet indead in August and September. However, everything changes from year to year.

Season temperature:

Season humidity:

Date of 50% snow-cover:

1.06-15.06

Date of ice-break on rivers:

20.05-1.06

Date of final loss of snow:

10-20.6

BIOTIC CONDITIONS

Rodents abundance evaluation:

high

Breeding conditions:

Typical low arctic with palse bogs and lakes, ponds and creeks of varying sizes (FI1). Large wet flatlands with open bogs, willow marshes and scubs. Small streams connect the different lakes by each other. A fairly large part of the area are easy accesible by foot and ??? access in late autumn. So the rate of ??? are pretty high at some of the best waterfowl patches in the area. Area is a transition one for reindeer cultivation (SW1S).

Rodent dynamics:

Very much depending of the face? of the cycles and/or the density of weasels and stoats also depending on ???? between habitats

Rodent species recorded:

Latin	Abundance
Lemmus lemmus	rare
Microtus oeconomus	common
Microtus agrestis	common
Clethrionomys rufocannus	abundant
Clethrionomys rutilus	rare

Summary of fauna studies:

SW1: A mapping of abundance and occurence in the area ???, covering summer seasons 1989-1995. Data for scientific studies over birds/animals of prey also occur as well as a large chank of vole/lemming and plant data. The bird data collected (except birds of prey and long-tailed squa) are all collected as a "hobby-project" as, a consequence of that two of the projects Ph.D.-students being experienced bird-watches.

Group of species	Presence	Breeding	Detailed studies
arctic foxes	Yes	breeding	Yes
lemmings	Yes	breeding	Yes
waders	Yes	breeding
swans	Yes
geese	Yes	breeding
ducks	Yes	breeding
birds of prey	Yes	breeding	Yes
ptarmigans	Yes
cranes	No
skuas	Yes	breeding	Yes
gulls/terns	Yes	breeding
owls	Yes	breeding	Yes
passerines	Yes	breeding

Human activity	Comment
permanent polar/meteorological/reserve station

Okasanen, T. 1993. Does predation prevent Norwegian lemmings from establishing permanent populations in lowland forests? In: The Biology of Lemmings. 425-437.
Oksanen, L.//Okasanen, T. 1992. Long-term microtine dynamics in north Fennoscandian tundra: the vole cycle and the lemming chaos. Ecography. 15(2): 226-236.
Oksanen, L.//Okasanen, T.//Ekerholm, P.//Moen, J.//Lundberg, P.//Schneider, M.//Aunapuu, M. 1995. Structure and dymnamics of Arctic-Subarctic Grazing Webs in Relation to Primary Productivity. 231-242.
Oksanen, T.//Okasanen, L.//Norberg, M. 1992. Habitat use of small mustelids in north Fennoscandian tundra: a test of the hypothesis of patchy exploitation ecosystems. Ecography. 15(2): 237-244.