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Breeding Avifauna of a Mediterranean Succession: The Holm oak and Cork Oak Series in the Eastern Pyrenees, 1. Analysis and Modelling of the Structure Gradient

Roger Prodon and Jean-Dominique Lebreton
Oikos
Vol. 37, No. 1 (Jul., 1981), pp. 21-38
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3544069
Stable URL: http://www.jstor.org/stable/3544069
Page Count: 18
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Breeding Avifauna of a Mediterranean Succession: The Holm oak and Cork Oak Series in the Eastern Pyrenees, 1. Analysis and Modelling of the Structure Gradient
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Abstract

Within the Mediterranean level of the Albères chain, 186 samples were taken in different formations from grassland to forest, with presence-absence sampling of the bird and plant species, and estimation of the relative cover of 7 vegetation layers, plus the rock itself. After multidimensional ordination (Correspondence Analysis) of the birds x stations matrix, and multiple correlation of the first factor F1 of C.A. with the 8 cover values, a model results which, (1) proves that F1 is the expression of a progressive evolution of the vegetation structure, (2) shows that there is a logarithmic relationship between this structural evolution and bird species turnover, (3) permits a calculation, for any station of the studied region, of optimal indices of avifaunistic gradient and of structure gradient, (4) allows one to predict semi-quantitatively, from the vegetation structure, the probable avifauna of any station, and vice versa. This gradient analysis is a good alternative to the classical model (unidimensional sequence of discrete classes), especially when an ecological succession is reconstructed from the simultaneous comparison of different stations. /// На уровне Средиземного моря в цепи Алберес были взяты пробы в разных формациях от лугов до леса. Проводилисъ учеты "присутствия-отсутствия" видов птиц и растений и определения степени покрытия растителтиостыю в 7 ярусах растителъного покрова и на Самых скалах. После многомерной ординации (анализ соответствия) птиц и стадий на матрице и множественной корреляции первого фактора F1 C.A. с 8 величинами покрытия получиласъ моделъ, котороя 1). подтвердила, что F1 - выражение прогрессивной эволюции структуры растителъного покрова, 2). показала, что имеется логарифмическая зависимостъ между этой структурной эволюцией и обилием видов птиц, 3). позволяет провести расчет для для любой стации исследуемого района оптималъных индексов авиафаунистического градиента и структурного градиента, 4). позволяет предсказатъ полуколичественно возможный состав авиафауны на основе структуры растителъного покрова для любой стации и наоборот. Этот градиентный анализ - хорошая алътернатива классической модели (одномерная последователъночтъ дискретных классов), особенно если эвологическая сукцессия реконструирована на основе одновременного сравнения различных стадий.

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