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In Topic: Help with Estimates of Vertebrates
07 February 2013 - 01:10 PM
bob1, on 02 February 2013 - 12:08 AM, said:
The answer you are looking for can't even begin to be estimated, so you have to make some assumptions.
And I did, the assumptions are as follows: Vertebrates that hatched or otherwise entered into the world.
hobglobin, on 02 February 2013 - 05:04 AM, said:
Yes it mainly depends on species, but a general trend may be that generalist species with no special needs in terms of habitat, diet, climate etc (also called ubiquitous, euryoecious or eurytopic, considering the different factors) have stable populations or increase even (examples are rats, mice, raccoons, sparrows, pigeons etc), whereas specialist species with quite narrow niches and specialist needs concerning the mentioned factors have often declining populations (stenotopic, stenoecious species).
Thanks for input
