Download PDF by Barbara Snow, David Snow: Birds and Berries (Poyser Monographs)

By Barbara Snow, David Snow

ISBN-10: 1408138212

ISBN-13: 9781408138212

ISBN-10: 1408138220

ISBN-13: 9781408138229

ISBN-10: 1408140837

ISBN-13: 9781408140833

The book's subtitle - A examine of an ecological interplay - effectively displays the author's topic yet could are likely to disguise the truth that the relationships among birds and berries may be even more than the easy, at the same time effective structures ('eat my end result, unfold my seeds' ) they might appear initially to be. Therein lies the middle of the ebook - the fewer noticeable intricacies and impications of plant/bird institutions, the coevolution of species now and again and the variation of a species (bird or plant) to extra its personal virtue. To complicate the scene, too, there are the 'exploiters', the pulp-predators and seed-predators that feed on the plant's expense.In half I of the ebook the authors supply debts through species of the timber and shrubs they saw over a long time of their research sector of southern England; equally, half 2 files the chook species they watched feeding, or trying to feed, or combating different birds from feeding, at the fruits.Part three levels commonly and isn't limited to Britain and Europe. It investigates the concepts and diversifications advanced and hired via vegetation to make sure their luck, and their makes an attempt at defence opposed to the chicken 'predators'. It seems on the birds themselves, their foraging thoughts and fruit personal tastes, the constraints of a fruit vitamin and variations to it, the time and effort budgets of fruit-eaters and, eventually, the fascinating query of coevolution of crops and birds.This thought-provoking textual content bargains many insights now not more often than not perceived via ornithologist or botanist and is illustrated in masterly style through John Busby's full of life drawings.

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Extra info for Birds and Berries (Poyser Monographs)

Sample text

The thrushes, RQbins, Blackcaps and Starlings feed a great deal Qn ivy fruit. Our Blackcap recQrds are mainly in April and May, when fruiting ivy attracts newly arrived migrants; the earlier records, in January and February, were from the sparse PQPulation Qfwintering Blackcaps. We had no. recQrds fQr cQrvids, and no. indicatiQn Qf any of them showing an interest in ivy fruits. In view of the unusual sQftness of the seeds, which probably cQntain the highest CQncentratiQn of the fruit's PQisons, we suggest that crows WQuld be in danger of damaging the seeds and releasing the PQisons during digestion of the fruit, and may avoid them for this reason; but there are records Qf Carrion CrQws eating ivy berries on the Continent (see below).

On 13 January we took these home, tied them to our two apple trees in conspicuous positions and awaited results. The nearest other mistletoes (those mentioned above) were about 350 m away. For 14 days no bird showed any interest in the mistletoe berries, although the weather at the time was very severe and several hungry Blackbirds, Song Thrushes and one Fieldfare were feeding on rotten apples and other food that we had put out just below the mistletoes. Then on the morning of 27 January a pair of Mistle Thrushes flew in and almost at once began to feed on the mistletoe berries.

Woodpigeons may also act as dispersers of ripe fruit (see text). Woodpigeons take about 30 times as many fruits per feed as the thrushes it is clear that they must destroy a major part of the ivy seed crop. 207). To this must be added a percentage destroyed when ripe fruit is eaten. As discussed below, there is evidence that W oodpigeons eating ripe ivy berries may sometimes act as dispersers as well as seed-predators. Ivy seeds, being soft, should be easily dealt with by Bullfinches and other small seed-predators.

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Birds and Berries (Poyser Monographs) by Barbara Snow, David Snow


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