The Shrinking World: Ecological consequences of Habitat Loss
By Ilkka Hanski
(2005. International Ecology Institute)
[Recommendation(s) II / 2012]
This present sequel on our book recoms is yet from the Conservation biology (Or books of the Natures in overall, et similar topics, already well presented prior this). But appears it that this selection is a book about population ecology and I think it has lots to say. Just due because I am not too much familiar with the subject, I try to keep this recommendation brief.
Of the books content I can't offer a too precise summarization, possibly. It's (relative) usual readings for the conservation biologists (et similar), likely, but the metapopulations (-study, or -dynamics) aren't too straightforward understandable topics for any common reader. There's fx quite much from the spesific methodology; formulations for calculating any singular species metapopulation capacity on any local spot of it's living habitat(s). Many things can affect for a population enflourishing or diminishing; The other species, migration/immigration to and away from that spot, etc... And so, it's said that any view from the expected/projected development from metapopulations always is an estimate. Yet, the theory aims to predict at which circumstances species can survive in the fragmented habitat.
Most examples at book are from the Northern boreal forest. Also, major part of the singular case studies, or metapopulation examples, are of researches by Hanski's (and his pupils) of the Fennoscandian Checkerspots (Melitaeinae); Their some butterfly species that - similarly as elsewhere on Europes – are found have declined/diminished along the disappearance of the former 'traditional landscape' and ending of the 'old time' farming practices. But then there's also wide variety other studies and examples referred, actually from many other parts of Globe. (Fx; from Costa Rica, Amazon - or the rainforests in general, from observed changes at adaptations of the urban birds on Europes cities during some decades scale, from various microhabitats of Palearctic forests, etc..)
However, the general reader probably does well to familiarize with concept from extinction debt. In short, and like the book also compactly acknownledges, in the fragmented habitat the survival (of species) appears secured only if new metapopulations form fast enough and close for the original living area - to replenish the disappearing some. So, unless the extinction debt isn't compensated by creation of suitable environments where specimens can move to, the 'debt' realizes as species losses (by varying extent and also often can happen during longer timescales projected for the futures.)
...But I don't claim this to represent but a few of the things discussed at the book more in particular. There's fx chapter on how the conservation areas would best be designeted in the light of the study of metapopulations, ao. Certainly, it's informative book and well readable, although some of the stuff is rather complex. Or, so I felt when reading it, since many concepts aren't too straightforward understandable without former biologist/naturalist backgrounds or education. (Very probably, of course, there is nowadays also several comparable books from metapopulation research.)
Now, having promised to keep the recommend short, I'll just cut this off for these few paragraphs. And further no sequels of the biology/naturalist books...Even though, I might happen find something of interest about the insects, and in that case...:) [/W-G.]