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Acesso aberto (Open Access)
Manguezais do Pará: fauna de galerias perfuradas por teredo em toras de Rhizophora
(Universidade Estadual de Campinas, 1989-11-29) FERREIRA, Clara Pantoja; AMARAL, Antonia Cecília Zacagnini; http://lattes.cnpq.br/4597417616952392
In view of the large area the mangroves occupy in the State of Para’s coast their well-known importance and with the purpose to investigate their plant composition and to demonstrate the importance of the galleries bored in the logs as an habitat to several populations, periodic collects of Rhizophora lags were conducted. Measurements of temperature, pH, salinity and dissolved oxigen were accomplished. The study region was divided into 2 AREAS. The first one located at the Igarape-Curumbá mangrove (Ananindeua), where the collects were carried cut from April 1985 through January 1986 and the second in the Municípios of Benevides, Belém (Mosqueiro Island), Vigia and São Caetano de Odivelas, in which collects were carried out in July 1987 and January 1988. The mangrove stands from both AREAS are well-developped, specially those from Vigia and São Caetano de Odivelas, that are structurally the most developped. Rhizophora wangle was the dominant species in the 2 AREAS. A total of 45 species and 5022 individuals was recorded from the galleries of the 40 Rhizophora logs analysed. CRUSTACEA was the dominant taxon both for individuals and species numbers in almost all Subareas. The amphipode Grandidierella bonnieroides was the dominant species in the fauna composing 43,5% of the total number of individuals. The high in the AREA I reflects the high proport of common species among Subareas. The low values among the species of the Subareas from AREA II indicates that the composition of the fauna found inside the galleries is affected both by the physical and biological conditions to which the Rhizophora logs are submitted. The relatively high species diversity values of the 2 AREAS suggests the existence of stable conditions inside the galleries, allowing biological adaptations and interactions.
Acesso aberto (Open Access)
Seasonal abundance of the shipworm Neoteredo reynei (Bivalvia, Teredinidae) in mangrove driftwood from a northern Brazilian beach
(2008-03) SANTOS FILHO, Carlos; TAGLIARO, Claudia Helena; BEASLEY, Colin Robert
Shipworms are important decomposers of wood, especially in mangrove forests where productivity is high. However, little emphasis has been given to the activity of shipworms in relation to the export of nutrients from mangroves to adjacent coastal areas. As a first step to obtaining such information, the frequency of colonized mangrove driftwood as well as shipworm density and length were studied by collecting washed up logs during a year at Ajuruteua beach, state of Pará, northern Brazil. A single species, Neoteredo reynei (Bartsch, 1920), was found colonizing driftwood. Although large colonized logs were most common on the beach, shipworm density was higher in small logs, especially during the dry season. In general, however, density was higher during the wet season (January to April) and lowest in July. Overall shipworm mean length was 9.66cm. In large logs, mean length increased between the wet and dry seasons. However, there was no difference in length among log size categories. Mean shipworm length was similar throughout most of the year but tended to be greater in July. Although salinity varied between 10.9 and 40 during the year, no relationship was found between salinity and density or length. The results suggest that shipworm activity in driftwood logs is relatively constant throughout the year. Increased air humidity and rainfall may promote survival during the wet season. Large logs may take longer to colonize and thus have lower densities than small ones which are scarce probably because they are destroyed rapidly by shipworm activity. However, data on the disintegration of logs would be necessary to test this hypothesis. Larger size of shipworms in the dry season may be related to growth after an earlier recruitment period. Shipworms in large logs during the dry season may be better protected from dessication and high temperatures by the insulating properties of the larger volume of wood.