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We investigated if the differences in density and nematode communities of intertidal sediments from two Brazilian sheltered sandy beaches were related to environmental characteristics. The upper tide level (UTL) and the low tide level (LTL) of both beaches were surveyed in January (austral summer) and June 2001 (austral winter) during low-spring tides, by(More)
—This paper describes the implementation of an RF receiver frontend for the 2.4 GHz ISM band; it comprises an LNA, an IQ oscillator/mixer, and a low-pass filter. The proposed circuit is low cost and power efficient. To be low cost the circuit is inductorless and implemented in a standard nanoscale digital CMOS technology, with a state-of-the-art figure for(More)
In this review, we summarize existing knowledge of the ecology of sandy-beach nematodes, in relation to spatial distribution, food webs, pollution and climate change. We attempt to discuss spatial scale patterns (macro-, meso- and microscale) according to their degree of importance in structuring sandy-beach nematode assemblages. This review will provide a(More)
A new species of the genus Acantholaimus is described from the South Atlantic, in the Potiguar Basin off the continental shelf of northeast Brazil. Acantholaimus marliae sp. n. is characterized by the long body; numerous somatic setae arranged in four sublateral longitudinal rows; buccal cavity with five solid teeth (four subventral and one dorsal), with(More)
Four new species of marine nematodes were collected from the continental shelf of the Potiguar Basin in northeastern Brazil. Zalonema vicentei sp. n. and Zalonema mariae sp. n. are characterized by having multispiral fovea amphidialis, lateral alae and ventral ala. These features also are found in Pseudochromadora, Desmodorella and Psammonema. They differ(More)
Most species of Taeniogyrus Semper, 1867 are known from shallow water in the Indo-Pacific, with other records in Antarctica, Mediterranean Sea, and the Atlantic. A new species of Taeniogyrus is described and illustrated here from the continental slope of Campos Basin, southeast of Brazil. In this species, sigmoid hooks (336-405 µm) are much larger than in(More)
Despite the increasing risk that ocean acidification will modify benthic communities, great uncertainty remains about how this impact will affect the lower trophic levels, such as members of the meiofauna. A mesocosm experiment was conducted to investigate the effects of water acidification on a phytal meiofauna community from a coral reef. Community(More)
A new genus of the family Desmodoridae, Cornurella gen. n. is described from a Campos Basin sea site, Rio de Janeiro, Brazil. It differs from the other genera of the family by the clearly annulated body cuticle, ornamented with eight longitudinal rows of spines, a strong cephalic capsule with thorn-like ornamentation; amphideal fovea closed loop-shaped in(More)