Though something about the cover artwork suggests that this is a so-called "user-friendly" or, perhaps less charitably, "dumbed-down" textbook on ecology, the maxim "don't judge a book by its cover" holds true. The fact is, it is somehow semi-encyclopedic in nature; in other words, it is part textbook and part reference text. Not infrequently it assumes considerable prior knowledge of biological topics. It is a fairly advanced text for this reason. There are few faults with the content, though sometimes explanation of models is somewhat opaque and of course any discussion involving p-values brings with it many caveats and perhaps even falsehoods. That however is a defect that one can find in many other texts as well. I recommend this title and I would go as far as to say that it is, as far as I know, peerless in some ways. Nonetheless, it is better to use it for the most part in the reference capacity I mentioned earlier.
Another nice thing about this book: its formatting is very uncluttered. Almost perfect graphic design except for the ugly orange shades being used therein.