Schistosomiasis is a disease of global extent reaching populations in social vulnerability. One of the control measures of this parasitosis is the use of molluscicidal substances that can fight snails of the genus Biomphalaria, intermediate hosts of Schistosoma mansoni. The aim of this work was to study the toxic activity of three mangrove species Avicennia schaueriana Stapf. CF Gaertn, and Rhizophora mangle L. Hydroalcoholic extracts were prepared from the stem and leaves of each of the three plant species to which mollusks were exposed.
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Mollusks associated with the Avicennia schaueriana Magnoliophyta: Acanthaceae roots of a hypersaline estuary in northeastern Brazil.
Avicennia schaeuriana is one of the six species that composes the mangrove forests of Brazil and form mangrove fringes along waterways. The mangrove-roots of the A. The present note aimed to inventory the malacofauna associated with roots of Avicennia schaueriana of the hypersaline and inverse estuary, highlighting variations in abundance and diversity along a salinity gradient and different seasonal periods.
Three sampling stations were delineated along the course of the estuary. At each station 3 transects of 10 meters were placed, and for each of them 3 sample points were selected, and at each point 3 samples of roots of A. A total of specimens was recorded, belonging to 10 species, 7 families, and 9 genera of the Bivalvia and Gastropoda classes. The abundance of the specimens differed between the seasonal periods analyzed.
The highest species richness and abundance of organisms in the rainy period allows inferences about the importance of the estuarine water cycle in regulating the biodiversity of these environments. Thus, the importance of the maintenance and protection of the mangrove forests composed of A. Mangrove environments are characterized by a structural complexity that provides stable conditions essential for the maintenance of estuarine ecological communities Feller et al.
The aerial mangrove-roots system, arranged in elevation to the substrate, significantly increases the architecture of mangrove forests, providing a habitat for colonization, feeding, and protection of several organisms Nagelkerken et al.
The groups of organisms that compose this biodiversity are mainly macrobentonic organisms, polychaetes, mollusks, and crustaceans Samidurai et al. These organisms actively participate in the mangrove food web, linking the food web to consumers at a higher trophic level Macintosh, ; Smith III et al.
With this perspective, the present note characterized the malacofauna associated with roots of Avicennia schaueriana of the hypersaline and inverse estuary, highlighting variations in abundance and diversity along a salinity gradient and different seasonal periods.
This environment is characterized by being hypersaline and inverse with a salinity that decreases as approaching the river mouth of the sea.
Sampling was performed per month in March and May rainy period and September and November dry period in , totaling four campaigns of data collection. At each station 3 transects of 10 meters were placed parallel to the margin, and for each of them 3 sample points were randomly selected. At each point, one pneumatophore sample of A. To verify if there were differences between the community of mollusk mangrove-roots associated with the sampling stations and the seasonal periods, an ANOVA test was performed.
A total of specimens was recorded, belonging to 10 species, 7 families, and 9 genera of the Bivalvia and Gastropoda classes Table 1. Among the gastropods, the family Pyramidellidae was the most representative in the number of species 3 spp.
Among the bivalves, the Mytilidae family was the most abundant with 82 specimens of the Brachidontes exustus Linnaeus, Table 1.
The abundance of the specimens differed between the seasonal periods analyzed F 1. Species richness was also higher for this period 10 spp. Table 1. The abundance of mollusks also differed among the sampling stations F 1.
With a posteriori Tukey test, it was observed that stations 1 and 3 were significantly different since they were the most distant and dissimilar with respect to the salinity gradient.
This is the first study that analyzes the mollusk composition associated with roots of Avicennia schaeuriana. Surveys have already been conducted with congenre A. The number of species found in the roots of A. This fact may be largely related to the smaller size of this root when compared to other species, but still the significant presence of mollusks in this microhabitat is observed, which demonstrates the great potential of these roots in offering shelter and protection for these individuals.
Bivalves, following a pattern observed in studies conducted in this type of environment, were more abundant than the gastropods Acosta Balbas et al. The dominance exerted by the bivalve can be explained by the strong bonding mechanism to the root by cementing or by the byssus thread, conferring greater resistance to these organisms in function of the high dynamics of the estuarine environment. The increased nutrient input as a result of rainfall should contribute to the increasing diversity of mollusks associated with the roots of Avicennia schaueriana.
The malacological fauna supported by the roots of A. Barroso et al. In general, the species A. To Luis Carlos Damasceno for their assistance in the field. Cite as: Muniz, A. Acta Limnologica Brasiliensia , , vol. Check List , , 9 3 , Biocomplexity in Mangrove ecosystems. Annual Review of Marine Science , , 2 1 , Atlas dos manguezais do Brasil. An ecological study on the Mollusca in mangrove areas in the estuary of the Jiulong River. Hydrobiologia , , , LIMA, S. Biota Neotropica , , 17 1 , e Ecology and productivity of Malaysian mangrove crab populations Decapoda: Brachyura.
Malaya: University of Malaya, , pp. Differences in benthic fauna and sediment among mangrove Avicennia marina var. Estuarine, Coastal and Shelf Science , , 56 , The habitat function of mangroves for terrestrial and marine fauna: a review.
Aquatic Botany , , 28 2 , Spatial and temporal distribution of macrobenthos in different mangrove ecosystems of Tamil Nadu Coast, India. Environmental Monitoring and Assessment , , 7 , Resource competition between microbenthic epifauna and infauna in a Kenyan Avicennia marina mangrove forest.
Marine Ecology Progress Series , , , Keystone species and mangrove forest dynamics: the influence of burrowing by crabs on soil nutrient status and forest productivity. Estuarine, Coastal and Shelf Science , , 33 5 , This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Services on Demand Journal. Short Research Note Mollusks associated with the Avicennia schaueriana Magnoliophyta: Acanthaceae roots of a hypersaline estuary in northeastern Brazil.
Abstract Aim Avicennia schaeuriana is one of the six species that composes the mangrove forests of Brazil and form mangrove fringes along waterways. Methods Three sampling stations were delineated along the course of the estuary. Results A total of specimens was recorded, belonging to 10 species, 7 families, and 9 genera of the Bivalvia and Gastropoda classes.
Conclusions The highest species richness and abundance of organisms in the rainy period allows inferences about the importance of the estuarine water cycle in regulating the biodiversity of these environments.
Received: July 02, ; Accepted: June 18, How to cite this article. Class Gastropoda. Parvanachis obesa C. Adams, Turbonilla fasciata d'Orbigny, Folinella robertsoni Altena, Sphenia fragilis H. Brachidontes exustus Linnaeus, Crassostrea rhizophorae Guilding, Anomalocardia flexuosa Linnaeus,
Sceura Forssk. Avicennia is a genus of flowering plants currently placed in the bear's breeches family, Acanthaceae. It contains mangrove trees , which occur in the intertidal zones of estuarine areas and are characterized by its "pencil roots" which are aerial roots. It is commonly known as api api which in the Malay language means "fires", a reference to the fact that fireflies often congregate on these trees. The taxonomic placement of Avicennia is contentious. In some classifications it has been placed in the family Verbenaceae , but more recently has been placed by some botanists in the monogeneric family Avicenniaceae.