Demografía de dos jaras mediterráneas (Cistus albidus L. y Cistus clusii dunal) en el Rosmarino-Ericion de la Sierra de Crevillente (provincia de Alicante)

  1. Bellot Abad, Juan
  2. Escarré Esteve, Antoni
Journal:
Mediterránea: Serie de estudios sobre biología terrestre mediterránea

ISSN: 0210-5004

Year of publication: 1980

Issue: 4

Pages: 89-113

Type: Article

DOI: 10.14198/MDTRRA1980.4.07 DIALNET GOOGLE SCHOLAR lock_openRUA editor

More publications in: Mediterránea: Serie de estudios sobre biología terrestre mediterránea

Abstract

The demography of two species of Cistus, C.albidus and C.clusii, very abundant in the Mediterranean shruby vegetation, was studied in a 15 Ha plot in Sierra de Crevillente (Alicante). The bedrock is calcareous and the vegetation can be classified as belonging to the association Fumano (ericoidis)-Stipetum tenacissimae Br. Bl. et Bolos (1957). The main interest of this kind of study is the possibility of making predictions about the future of both populations in relation to hipothetical changes in succession. Forty three plots of 2x2 m uniformely distributed were censused for two species twice within a year's interval. The density (C.albidus 1.09 individual per square meter, and C.clusii 1.48 in sq.m.) and size-age structure were obtained each time. It is possible to distinguish two kinds of mortality, parcial and total, that show different relation with the size-age in the two species. Survivorship curves were obtained with the two mortality rates combined. The curves show a very high mortality in plantules in both species. The fit of this curve to exponential and potential expressions was tried. The best fit to the exponential model would indicate lack of dependence between age and mortality, particulary in C.albidus. Moreover, the projection of synchronous size-age structures of populations as diachronous ones give a poorer fit to both models. The reproductive effort was evaluated as the 13-19% of net primary production in C.albidus and 14-37% in C.clusii. This can be considered as a "competitive" characteristic of both species that must compensate predation on fruits (31 and 14% in weigth respectively in C.albidus and C.clusii), low germination rate of seeds (19 and 27%) and great mortality of plantules (72 and 89%). The result is a great efficience of C.albidus (0.0026) that in C.clusii (0.00009). Leslie matrix was used in the prediction of future structures of populations. The eigenvalue was 1.298 for C.albidus and 1.104 in C.clusii and the corresponding values for r was 0.26 and 0.098, the first of them very close to the stationary state. The disagreement between the present structure of population and the stable one obtained by the eigenvectors associated to the eigenvalue of the Leslie matrix, can be expressed by the dissimilarity index. The values was 20.72 for C.albidus and 43.45 in C.clusii more far the last of the stable model.

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