9 datasets gevonden
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Trends in populations of selected butterfly species
Trends in populations of selected butterfly species -
North Sea fish stocks and stocks of North East Atlantic mackerel: 1964 to 20...
Spawning stock biomass (SSB) is the total weight of all sexually mature fish in a population. Spawning stock biomass index (1964=100(mackerel 1980=100)) -
North Sea fish stocks and stocks of North East Atlantic mackerel: 1964 to 201...
Spawning stock biomass (SSB) is the total weight of all sexually mature fish in a population. Four of the five measured species have shown a small increase in adult biomass in... -
Trends in populations of selected bat species: 1990 - 2010
Trends in populations of selected bat species -
Population of wild birds (UK) : 1970 to 2010
Overall breeding bird populations in the UK have changed little compared with 40 years ago. In 2010 they were 4.4 per cent higher than they were in 1970, following a small... -
population of wild birds - wintering waterbirds: 1975/76 to 2007/08
population of wild birds - wintering waterbirds: 1975/76 to 2007/08 -
Trends in populations of selected species (wild birds)
Trends in populations of selected species (wild birds) -
Population of wild birds (England): 1970-2010
Overall breeding bird populations in England have changed little compared with 40 years ago. In 2010 they were just above what they were in 1970, following a small decline of... -
Index of the UK population of wild birds - Individual species indices
Index of the UK population of wild birds - Individual species indices
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