Anales de biología Vol. 8 (1986) Biología ambiental, 2

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    Methods for the study of Marine Benthos: reseña bibliográfica
    (Murcia: Universidad de Murcia, Servicio de Publicaciones, 1986) Pérez Ruzafa, Angel; Facultad de Biología
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    Ecosistemas de rios temporales: ecología de las poblaciones de efemerópteros de la cuenca del rio Bembézar (Sierra Morena)
    (Murcia: Universidad de Murcia, Servicio de Publicaciones, 1986) Puig, M. A.; Ferreras Romero, M.; Rojas, M. R.; Facultad de Biología
    Three types of streams are noted for the temporary basin of the Bembézar river: the temporary streams, the permanent streams and the temporary streams with stable pools in summer. )4 species of Ephemeroptera have been caugth along two years (1982 and 1983). The distribution of these species has been different from year to year. An individual pattern of the community evolution for each sampling site has been observed.
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    Gradiente longitudinal de distribución de la vegetación ribereña del río Bernesga (León) en su tramo de montaña
    (Murcia: Universidad de Murcia, Servicio de Publicaciones, 1986) Fernández Aláez, C.; Calabuig, E. Luis; Fernández Aláez, M.; Facultad de Biología
    The distribution o€ macrophytic vegetation associated to the mountain stretch o€ the Bernesga river (León, Spain) is anaiysed on the basis o€ the data coliected in 36 transects distributed on both banks and perpendicular to the river bed. The similarity among the sarnples placed along the river is on the whole low, except in those having an outstanding presence o€ Carex acuta subsp. broteriana; nevertheless, the strongest affinity among close transects allows to taik o€ a continous change in the vegetation. The best delimited areas embrace, on the one hand, the first kilometers where there are no real banks and both sides o€ the river are covered mainly by swampy meadows and harvest grassland with a high degree of dampness; and, on the other, the lower part where the riparian community gets its own physiognomy and Agrostis stolonifera, Mentha longifolia and mostly Carex acuta subsp. broteriana constitute the most important species.
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    Importancia de las distintas fases del proceso de reclutamiento en hormigas para la explotación de sus recursos alimenticios
    (Murcia: Universidad de Murcia, Servicio de Publicaciones, 1986) Ferradas, M. A.; Acosta, F. J.; Serrano, J. M.; Facultad de Biología
    On réalise une étude des systemes de fourragement sur plusieurs especes de fourmis, d'apres les comptages successifs du nombre d'individus employés dans ce travail dans différentes colonies. L'accroissement du nombre d'individus utilisés pendant les premieres étapes du procédé de fourragement démontre une grande unifomité, aussi bien chez les différentes especes que dans plusieurs conditions expérimentales, se ressemblant a un accroissement de type logistique. Les étapes finales du procédé de fourragement. que suppose la fin de I'exploitation d'une source de nouniture localisée (aussi bien devant la persistance de celle-ci comme de sa disparition, spontanée ou provoquée), démontre une plus grande vanété, bien qu'elles semblent signaler I'existence de mécanismes de controle precis chez les sociétés. Nous considerons ce point tres intéressant pour pouvoir comprende de facon exacte I'eficacité des systemes de fourragement.
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    Ecología y ordenación del territorio: el caso del Mar Menor y ecosistemas adyacentes (Murcia; SE España). 1: prospección y sectorización del medio fisíco
    (Murcia: Universidad de Murcia, Servicio de Publicaciones, 1986) Martín de Agar Valverde, María del Pilar; Torres Martínez, Antonio Ángel; Ramírez-Díaz, Luis; Facultad de Biología
    This report is the first part of an integrated ecological study on Mar Menor area and its neighbouring ecosystems. The phase of survey and land units stablishment is described, based on those data obtained from the natural environment and the characterization of intemally homogeneus sectors in relation to those elements that shape this are of study. Five themes have been considered: Climate (4), Geology-Litology (14), Hidrology (14), Geomorfology (21) and Soils (25). The figures refer to the numbers of characterized units. The results are cartographycally shown on a scale I: 50.000. The overall analysis of the physical factors and land and human elements -subject for next publication-, will let us take into fina