Assessing potential effects of global climate change on tropical freshwater fishes
Asia ; Biogeography ; Climatic variation ; Ecosystem ; Fish ; Fresh water ; Global change ; Tropical zone
The extreme seasonal fluctuations in discharge of tropical rivers, through the effects on fish habitat availability and habitat conditions, have produced a range in preferred habitat types among riverine fishes. The AA. suggest that initial
assessment of potential effects of climate change on tropical freshwater fishes should focus on changes to water quantity variables in riverine environments.
Consumption ; Fish ; Fish product ; Fishery;Fishing ; Fishing industry ; Food product ; Industry ; International trade ; Sea fishing ; Tuna ; United States
Characterizing the pelagic fish assemblage in Lake Paanajärvi : scarce stocks and large individuals
Ecosystem ; European part of Russia ; Fish ; Geophysics ; Human impact ; Karelia ; Lake ; Spatial distribution ; Water quality
The structure of fish stocks in the pelagic areas of Paanajärvi, a deep northern lake in a natural state, was characterized by means of echo surveys and test fishing in 1992-1994. The pelagic fish densities were in general relatively large
, their size distribution resembling more that of pelagic areas in practically unfished natural lakes than that of exploited lakes. The structure of the pelagic fish assemblage in Paanajärvi stresses the importance of nature conservation as means of evaluating
Tools for assessing the impact of climate change on freshwater fish populations
Biogeography ; Climatic variation ; Ecosystem ; Fish ; Fresh water ; Model ; North America ; Temperature
The AA. examine the use of bioenergetic models to predict the impact of climate change on the growth of individual fish and the use of thermal habitat models to assess the impact of climate change on population abundance. They examine also the use
Adjustments to calculated Quaternary displacement rates across the Fish Springs Fault, Owens Valley Fault Zone, California
Rectifications des données parues dans l'article Late Quaternary vertical displacement rate across the Fish Springs Fault, Owens Valley Fault Zone, California des mêmes auteurs (Quaternary Research 27, 113-129).
carbon supply to the basin was from fish-processing waste. The relatively high flux of allochtonous carbon into Boca de Quadra appears to consist predominantly of refractory material which does not create a significant oxygen demand within the basin.
Commonly accepted theories of zooplankton species distribution hold that: 1. large-bodied zooplankton species are excluded by fish predation and so are found only in lakes and ponds without fish| and 2. because small-bodied species are unable
to compete successfully against large ones and also are preyed upon heavily by invertebrate predators, they exist primarily in lakes with fish. This pattern is not followed in a group of lakes and ponds in arctic Alaska. Some of these lakes were found
to support both large and small zooplankton species along with populations of facultative planktivorous fish. Other lakes that had no fish had a small-bodied zooplankton species co-existing with a more typical large-bodied community. Close analysis
Evaluation visuelle des peuplements et populations de poissons: méthodes et problèmes. (The underwater observation of fish communities and fish populations. Methods and problems)
Following the symposium held in June 1984 at Port Cros, the methods of underwater observation of fish communities and populations are critically reviewed. Particular emphasis is laid upon the possible causes of bias, and the ways of circumventing