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  • 1
    ISSN: 1432-1939
    Keywords: Nitrate reductase ; Chlorophyll content ; Leaf Specific Area ; Open-forest ; Closed-forest (rainforest)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A study of the sun leaves of two closed-forest (rainforest) and eight open-forest communities in subtropical southeast Queensland, Australia, showed that a large number of pioneer woody species in closed-forests had high levels of nitrate reductase (EC 1.6.6.1), whereas only a few herbaceous species in the open-forests showed high levels. There was a continuously declining gradient in nitrate reductase activity from pioneer to mature-forest species in all communities, associated with a decrease in Leaf Specific Area. The level of nitrate reductase activity was lower in certain plant families (including sclerophyllous monocotyledons, small-leaved composites and legumes), but still showed the same general relationship with Leaf Specific Area. The decrease in Leaf Specific Area is associated with an increase in both the dry weight: fresh weight ratio and the chlorophyll a: chlorophyll b ratio of the leaves. Three groups of plants can be recognised by nitrate reductase activity plotted against water content (% fresh weight) of their leaves-(1) pioneer, (2) mature-forest and (3) semi-sclerophyllous species. As the proportion of cytoplasm to structural tissue (indicated by water content) in leaves increases, there is a continuous increase in (a) nitrate reductase activity (b) total chlorophyll (per unit dry weight) (c) the proportion of chlorophyll b to chlorophyll a and (b) chloroplastic isoform of glutamine synthetase. These attributes are associated with high nitrogen content in the leaves and high photosynthetic potentials, resulting in rapid growth rates of pioneer species.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2021-05-19
    Description: Se estudió la composición y abundancia de los moluscos bentónicos encontrados en el departamento de La Guajira al norte del Caribe colombiano. Para esto se realizó un crucero de investigación a bordo del B/I Ancón del INVEMAR en donde se llevaron a cabo arrastres a 10 y 50 m de profundidad. Se recolectó un total de 4840 individuos, identificándose 215 especies pertenecientes a las clases Gastropoda, Bivalvia, Scaphopoda, Cephalopoda y Polyplacophora, dentro de las cuales 19 fueron especies registradas por primera vez para el departamento. La clase Gastropoda presentó el mayor número de especies (52 %) y Bivalvia la mayor abundancia (71 % de los individuos), siendo el bivalvo Laevicardium sybariticum la especie más abundante del área de estudio. Los análisis multivariados utilizados no mostraron patrones claramente definidos con relación a la profundidad y el tipo de sedimento.
    Description: Benthic mollusks of La Guajira (10 and 50 m depths), Colombian Caribbean. We studied the composition and abundance of benthic mollusks found in La Guajira along the northern Caribbean coast of Colombia. A research cruise was carried out on board the R/V Ancón INVEMAR, from which bottom trawlings were conducted at 10 and 50 m depths. A total of 4840 individuals were collected, and 215 species identified belonging to the classes Gastropoda, Bivalvia, Scaphopoda, Cephalopoda and Polyplacophora. Nineteen species were recorded for the first time in La Guajira. The class Gastropoda had the highest number of species (52 %) and Bivalvia showed the greatest abundance (71 % of individuals). The bivalve Laevicardium sybariticum was the most abundant species in the study area. Multivariate analysis showed no defined patterns in relation to depth and bottom type.
    Description: Published
    Description: Mollusks, Richness
    Keywords: Abundance
    Repository Name: AquaDocs
    Type: Journal Contribution
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