But for Dicrostonyx torquatus
, short photoperiod increased body mass and reduced thermogenesis (Powel et al., 2002).
Lemmussibirica and Dicrostonyx torquatus
), because lemming predators shift to bird eggs and young during poor rodent years (e.g.
However, because the search plot was situated in good winter habitat for Siberian lemmings (Lemmus sibiricus) (Dunaeva, 1948), and because this species dominates the study area, we assumed that most observed winter nests belonged to Siberian lemmings, rather than to collared lemmings (Dicrostonyx torquatus
), the second but less frequent lemming species in the study area (Popov, 2009).
lemmus) and collared lemmings (principally Dicrostonyx torquatus
On Wrangel Island, a large ([approximately]5200 [km.sup.2]) island in Chukchi Sea, both species of lemmings (Dicrostonyx torquatus
and Lemmus sibiricus) go through 4-5 yr cycles, with L.
In addition to wolves and geese, other animals common in the area included grizzly bears (Ursus arctos), wolverines (Gulo gulo), arctic foxes, caribou, muskoxen, ptarmigans (Lagopus spp.), collared lemmings (Dicrostonyx torquatus
), and red-backed voles (Clethrionomys rutilus).
Terrestrial mammals common in the colony were arctic foxes, collared lemmings (Dicrostonyx torquatus
), and muskoxen (Ovibos moschatus).
No identifiable remains of collared lemming (Dicrostonyx torquatus
groenlandicus) were found in Scoresbysund (Area 3), the only one of the eight study areas where lemmings are distributed.
Terrestrial mammals seen at the study area included small mammals (Lemmus sibiricus, Dicrostonyx torquatus
, and Clethrionomys rutilus), barren-ground caribou (Rangifer tarandus), muskox (Ovibos moschatus), arctic wolf (Canis lupus), barren-ground grizzly bear (Ursus arctos), and wolverine (Gulo gulo).
Lemmings Lemmus and Dicrostonyx species: Lemmus sibiricus and Dicrostonyx torquatus
both occur on Southampton Island (Sutton and Hamilton, 1932), but despite keeping a sharp lookout for droppings and runways, we saw no evidence that lemmings occurred on Coats Island during our visits, nor did J.
With the exception of lemmings (Dicrostonyx torquatus
and Lemmus sibiricus), these species constituted the entire guild of herbivores during winter in the study area.
Further evidence for the open landscape proposed for Zones IIa and IIb is the identification of a single specimen of collared lemming (Dicrostonyx torquatus
) recovered from Zone IIb in 1991.