[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: Avian extinction ref.
> And Carolina parakeets, and great auks...
Again, these are good thoughts, and may in fact be straight-up overkill
extinctions. However, has this been shown with any degree of confidence? I
was under the impression that Carolina parakeets, for example, were a
multiple-factor extinction. Great auks might be a good example of a predation
Since oceanic birds are so important to this thread, here is an additional line
of questioning that might be interesting to pursue:
Oceanic birds are prevalent on islands (for obvious reasons, the main one being
they can reach them). This means that many oceanic species have restricted
ranges (at least breeding ranges, the actual range of an albatross is
practically unbounded at sea). However, it also means that they are among the
predators most likely to make it to oceanic islands and prey on isolated
populations of other seabirds.
So here's the question: do extant seabirds show up as being polarized towards
very rare and very common, with few species in between? We could take a look
at the IUCN redlist and make a tally to see. Could be interesting (or maybe
not at all). This wouldn't actually demonstrate cause, but the speculation
above at least makes me curious what the pattern of threat is in groups like
Alcids, Larids, and Procellariiforms.