Population structure of Comesoma arenae Gerlach (Nematoda, Comesomatidae) in a Brazilian tropical tidalflat, Rio de Janeiro, Brazil

Esteves, André Morgado; Maria, Tatiana F.; Wandeness, Adriane Pereira

doi:10.1590/s0101-81752004000400008

Cited by 6 publications

(7 citation statements)

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“…Comparing the results of this study with the previous studies by Esteves et al (2003Esteves et al ( , 2004 in the same tidal flat, Daptonema oxycerca behaved similarly to Comesoma arenae, preferring the colder months. Comesoma arenae had its highest densities during July and August, austral winter, whereas D. oxycerca showed a peak in August and occurred only from June to November.…”

Section: Discussionsupporting

confidence: 79%

“…The lack of a previous record in Brazil was probably due to the poor stage of identification of the collected material along the Brazilian coast, mostly reaching only the genus level. The knowledge on the local nematode species has improved very recently with the increase of taxonomists in the group (ESTEVES et al, 2003;2004;VENEKEY et al, 2005;CASTRO et al, 2006, BOTELHO et al, 2007.…”

Section: Discussionmentioning

confidence: 99%

“…However, up to now, nothing is known of this species in tropical regions. According to previous data, this species is one of the most abundant species of the tidal flat of Sepetiba Bay (ESTEVES, 2004). Thus the aim of this paper was to describe the spatio-temporal distribution and population structure of Daptonema oxycerca in Coroa Grande, state of Rio de Janeiro, Brazil, during the course of one year, in order to assess whether any environmental factors (chlorophyll a, granulometry, organic matter, salinity, and temperature) influenced its distribution.…”

Section: Introductionmentioning

confidence: 99%

“…In Brazil, taxonomic work on free-living nematodes began in the mid-20th century (GERLACH, 1954(GERLACH, , 1956a(GERLACH, , 1956b(GERLACH, , 1957a(GERLACH, , 1957b. Studies then ceased until the end of the century, when a new group of investigators began work, principally relating the occurrence of nematodes to ecological aspects (MEDEIROS, 1998;NETTO;GALLUCCI, 2003;ESTEVES et al, 2003ESTEVES et al, , 2004GENEVOIS et al, 2004;DA ROCHA et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Spatio-temporal study and population structure of Daptonema Oxycerca (Nematoda: Xyalidae) in Coroa Grande, Rio de Janeiro, Brazil

et al. 2008

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Daptonema oxycerca was originally described from the North Sea and, up to now, nothing is known of this species in tropical regions. The spatio-temporal distribution and the population structure of this species was studied during one-year period (from May 1998 through April 1999) in Coroa Grande, Rio de Janeiro, Brazil. For sampling, two fixed, parallel transects were established perpendicularly to the shoreline, and at each transect, four, equally spaced levels were marked to represent the upper and the low intertidal zones. The lowest temperatures occurred in the end of the austral winter and first month of the spring and the highest temperatures occurred in the austral summer. The density of D. oxycerca varied during the year, with a peak in August. This tendency was observed for males, ovigerous females, and non-ovigerous females. The species density was negative correlated with temperature. The sex ratio was not statistically significant. D. oxycerca was most abundant at the upper intertidal level in both transects. This work provides the first record of D. oxycerca in Brazil, and confirms the influence of temperature in regulating its population density. RESUMODaptonema oxycerca foi descrita originalmente para o Mar do Norte, mas até o momento nada se conhece sobre essa espécie em regiões tropicais. A distribuição espaço-temporal e a estrutura populacional de D. oxycerca foram estudadas durante o período de um ano (de Maio 1998 a Abril 1999) em Coroa Grande, Rio de Janeiro, Brasil. Para a amostragem, dois transectos fixos e perpendiculares à linha d'água foram estabelecidos, e, em cada transecto, quatro níveis foram marcados para representar as zonas superior e inferior do médiolitoral. As menores temperaturas foram observadas no final do inverno e início da primavera e as maiores temperaturas no verão. A densidade de D. oxycerca variou durante o ano, com um pico em agosto. Essa tendência foi observada para os machos, as fêmeas grávidas e as fêmeas não-grávidas. A densidade da espécie correlacionou-se negativamente com a temperatura. A variação da razão sexual não foi significativa. D. oxycerca foi mais abundante no nível superior do médiolitoral em ambos os transectos. Esse trabalho representa o primeiro registro de D. oxycerca no Brasil, assim como, confirma a influência da temperatura na regulação de sua densidade populacional.

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Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatio-temporal study and population structure of Daptonema Oxycerca (Nematoda: Xyalidae) in Coroa Grande, Rio de Janeiro, Brazil

et al. 2008

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“…Of these ecological studies, 7 are exclusively related to the effects of environmental variables on the population of a single nematode species (ESTEVES et al, 2003(ESTEVES et al, , 2004MARIA et al, 2008a;VENEKEY et al, 2011) and tardigrades (CASTRO et al, 1999;DA ROCHA et al, 2004;VERÇOSA et al, 2009) and have not been listed in Table 1. The other 37 are related to meiofauna community studies.…”

Section: Resultsmentioning

confidence: 99%

State of the art of the meiofauna of Brazilian Sandy Beaches

2016

Self Cite

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In Brazil, meiofauna studies began in the middle of last century, but they adopted a purely taxonomical approach, describing species from various zoological groups. After this first step, this benthic group was largely neglected until the end of the 20th century when ecological studies began. We here provide a brief review of present knowledge of the meiofauna found on Brazilian sandy beaches to provide information for ReBentos (Coastal Benthic Habitats Monitoring Network). Our methodology consisted of a bibliographic survey undertaken using different datasets (Web of ScienceTM, SCOPUS, Google Scholar and Lattes Plataform). For the survey, we considered only those studies published till early 2015. Our analysis showed that the number of meiofauna studies has increased over the last two decades, though they are mainly still concentrated on the Southeast of Brazil. These studies aim to explain the distribution pattern of the meiofauna of the intertidal region of sandy beaches. Based on the results, we presented a discussion of three main topics, i.e., (a) current knowledge of Brazilian sandy beach meiofauna, (b) sampling strategies for monitoring of the meiofauna, and (c) use of the meiofauna as a tool to assess climate change. We trust that this brief review will be useful as a starting point for the delineation of further climate change investigations into sandy beach meiofauna.

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Free-living nematodes from a colonisation experiment in the upwelling area of Arraial do Cabo, Rio de Janeiro, Brazil: Lavareda decraemerae gen. n., sp. n. and emended diagnosis of Cricolaimus Southern, 1914 (Plectida: Rhadinematidae)

Fonsêca-Genevois

Smol

Bezerra

2011

Nematol

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Lavareda decraemerae gen. n., sp. n. is characterised by a cheilostom with a sclerotised ring bearing six anterior projections, a funnel-shaped to tubular stegostom, a large unispiral amphid with wide groove and males with a single precloacal setiform sensillum and 19 tubular supplements in a continuous series. The new species is similar to Cricolaimus coronatus in having the cheilostom consisting of a cuticularised ring with anterior projections. Re-examination of C. elongatus revealed clear differences to the new species, the former showing a bilateral symmetry anteriorly with a lateral axis: the lips are merged into one large dorsal and one large ventral lip with elongated inner and outer labial sensilla and the cheilostom has a cuticularised oblique ring, higher dorsally and ventrally than laterally, with two anteriorly directed claw-like projections, one mid-dorsal and one mid-ventral, whereas the new species has a radial symmetry with low lips with inner and outer labial papillae indistinct and a cheilostom with a cuticularised ring with six anteriorly directed projections, thereby justifying the proposal of Lavareda gen. n. to accommodate the new species from Brazil and L. coronatus comb. n. (= C. coronatus). An emended diagnosis of Cricolaimus is given. This is the first record of a species belonging to the Rhadinematidae colonising an artificial substrate.

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Population structure of Comesoma arenae Gerlach (Nematoda, Comesomatidae) in a Brazilian tropical tidalflat, Rio de Janeiro, Brazil

Cited by 6 publications

References 4 publications

Spatio-temporal study and population structure of Daptonema Oxycerca (Nematoda: Xyalidae) in Coroa Grande, Rio de Janeiro, Brazil

Spatio-temporal study and population structure of Daptonema Oxycerca (Nematoda: Xyalidae) in Coroa Grande, Rio de Janeiro, Brazil

State of the art of the meiofauna of Brazilian Sandy Beaches

Free-living nematodes from a colonisation experiment in the upwelling area of Arraial do Cabo, Rio de Janeiro, Brazil: Lavareda decraemerae gen. n., sp. n. and emended diagnosis of Cricolaimus Southern, 1914 (Plectida: Rhadinematidae)

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