Results 231 to 240 of about 22,838 (267)

Signal crayfish as vectors in crayfish plague in Britain

Aquaculture, 1990
Abstract An outbreak of crayfish plague (caused by the fungus Aphanomyces astaci) is described in white-clawed crayfish, Austopotamobius pallipes, in enclosed pond culture in an area of England from which no disease outbreaks have yet been reported.
D.J. Alderman, D. Holdich, I. Reeve
openaire   +1 more source

REPLACEMENT OF RESIDENT CRAYFISHES BY AN EXOTIC CRAYFISH: THE ROLES OF COMPETITION AND PREDATION

Ecological Applications, 1999
Exotic species are often a threat to native biodiversity. In northern Wisconsin lakes, the invading crayfish Orconectes rusticus is replacing 0. virilis, the native, and 0. propinquus, a previous invader. We tested the impacts of interspecific competition for food and of nonconsumptive effects of predation by largemouth bass, Micropterus salmoides, on ...
Anna M. Hill, David M. Lodge
openaire   +1 more source

Crayfish

2019
The chapter reviews the invasive crayfish of the world.
openaire   +2 more sources

Crayfish extinctions and crayfish plague in central Ireland

Biological Conservation, 1988
Abstract The white-clawed crayfish Austropotamobius pallipes (Lereboullet) has been losing ground in Western Europe but remains widespread in Ireland, whose stocks are well-studied and of European conservation importance. Crayfish fungal plague, fatal to white-clawed crayfish, has affected all other European countries; it was first diagnosed in an ...
openaire   +1 more source

Interneurons in the tritocerebrum of the crayfish

Brain Research, 1987
In isolated head preparations of the freshwater crayfish Orconectes limosus 268 local and projecting interneurons with branches in the tritocerebrum have been penetrated with glass microelectrodes and characterized for their sensory inputs. Using 3 criteria (sensory modality, site of receptors, response type of interneurons), the interneurons found ...
openaire   +2 more sources

Crayfish gastroliths

Geology Today, 2019
Crayfish produce small button‐like gastroliths in their stomachs. These curious calcitic objects are increasingly common in lakes and streams in the UK and Europe as the invasive American crayfish increase their domination of freshwater environments. These stomach stones are also present in the geological record.
Ethan A. Tucker, Maurice E. Tucker
openaire   +1 more source

Visual Pigments of Crayfish

Nature, 1967
Crayfish eye extracts contain two visual pigments resembling in spectrum vertebrate rhodopsin and iodopsin. In these crayfish, as in primates, the “iodopsin” appears to be the red sensitive pigment of colour vision.
openaire   +2 more sources

The Crayfish That Was Afraid of the Light

Science Signaling, 2014
Crayfish respond to stress with an apparent fear of the dark that can be abolished with an anxiolytic drug.
openaire   +1 more source

Freshwater crayfish invasions: former crayfish invader Galician crayfish hands title “invasive” over to new invader spiny-cheek crayfish

Biological Invasions, 2008
Biological invasions are a major threat to global biodiversity. Invasive freshwater crayfish in that context are especially prominent for their negative effects on both ecosystem integrity and native crayfish. However, some systems may have supported a crayfish species not originally native to the system without perceivable negative consequences for ...
openaire   +1 more source