Recent Hazel Grouse Bonasa bonasia Population Declines in Hokkaido, Japan.

Intestinal parasite infection exposes grouse to canine predators

Background Sublethal parasite infections may cause mortality indirectly by exposing the host to predation. The best known example of this among birds is red grouse in which caecal nematode infection causes increased risk of predation and can even affect population dynamics [1]. Intestinal helminth parasites are common in forest grouse, capercaillie Tetrao urogallus, black grouse Tetrao tetrix a...

Characterization of sapoviruses detected in Hokkaido, Japan.

Reliability of genetic bottleneck tests for detecting recent population declines.

The identification of population bottlenecks is critical in conservation because populations that have experienced significant reductions in abundance are subject to a variety of genetic and demographic processes that can hasten extinction. Genetic bottleneck tests constitute an appealing and popular approach for determining if a population decline has occurred because they only require samplin...

Age and growth of marbled sole Pleuronectoes yokohomae in Kikonai Bay, Hokkaido, Japan

Age and growth of marbled sole Pleuronectes yokohamae werer estimated from growth increments in otolith. The samples were collected with commercial set nets and an experimental bottom trawl net in Kikonai Bay and the nearby waters, southern coast of Hokkaido, from May 1994 to July 1995. Monthly changes in the percentage occurrence of oltoliths with translucent edge in one band and the marginal ...

Age and growth of marbled sole Pleuronectoes yokohomae in Kikonai Bay, Hokkaido, Japan

Age and growth of marbled sole Pleuronectes yokohamae werer estimated from growth increments in otolith. The samples were collected with commercial set nets and an experimental bottom trawl net in Kikonai Bay and the nearby waters, southern coast of Hokkaido, from May 1994 to July 1995. Monthly changes in the percentage occurrence of oltoliths with translucent edge in one band and the marginal ...