Reproductive biology of <i>Psammobatis extenta</i>

Braccini, J. M.; Chiaramonte, Gustavo Enrique

doi:10.1111/j.1095-8649.2002.tb01752.x

Cited by 63 publications

(48 citation statements)

References 18 publications

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“…Such a pattern has been also observed in other Rajidae, e.g. Raja radiata (Skjaeraasen & Bergstad, 2000) and Psammobatis extenta (Braccini & Chiaramonte, 2002).…”

Section: P R O O F Smentioning

confidence: 72%

“…In A. cyclophora, males and females in all development stages have the same spatial distribution and share the same habitat along the year. Such a distribution pattern was also observed for Raja clavata, R. erinacea, R. miraletus and Psammobatis extenta (Nottage & Perkins, 1983;Richards et al, 1963;Capapé & Quignard, 1974;Braccini & Chiaramonte, 2002) and seems to be a common pattern for Rajidae.…”

Section: P R O O F Smentioning

confidence: 80%

“…Females of A. cyclophora were significantly heavier than males, fact already noted for other Rajidae, like Psammobatis extenta (Braccini & Chiaramonte, 2002) and Sympterygia bonapartii (Mabragaña et al, 2002). This difference could be related to the sexually dimorphic liver weight.…”

Section: P R O O F Smentioning

confidence: 83%

“…Neonates and small juveniles were probably abundant between 100 and 300 m depth, but were not caught due to the ineffectiveness of the sampling method, in such a way that samples partially represented the population. Ponz Louro (1995) and Braccini & Chiaramonte (2002) verified the absence or rareness of neonates and small juveniles in samples obtained with bottom-trawl net, possibly a general characteristic of all Rajidae. Fishing with bottom trawl net has possibly a low direct impact over juveniles of the species of Rajidae, except by an eventual egg or buried juvenile crushing.…”

Section: P R O O F Smentioning

confidence: 99%

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Distribution, abundance and morphometry of Atlantoraja cyclophora (Regan, 1903) (Elasmobranchii: Rajidae) in southern Brazil, Southwestern Atlantic

Oddone¹,

Vooren²

2004

Neotrop. ichthyol.

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A total of 459 individuals of Atlantoraja cyclophora were captured along the Rio Grande do Sul coast between latitudes 30°40'S and 34°30'S. Two surveys were performed, in the winter 2001 and in the summer/autumn 2002, using bottom-trawl between the depths of 100 and 600 m. This species occurred between 100 and 300 m deep, without significant differences in the frequency of occurrence and abundance (CPUE; kg/hour) between latitudes, depth and seasons. The sex ratio was not significantly different from 1:1 in all depths. In the study area, temperature ranged between 10.0 °C and 17.6 °C and salinity between 35.2 e 36.0 ppm. There was no correlation between CPUE and depth, temperature and salinity. Mean total length of females (53.2 cm) was significantly larger than males (50.9 cm). No differences were detected in mean total length between seasons, but mean total length was significantly larger in depths of 100 m and 200 m. The distribution of the frequencies of total length was asymmetric, indicating rareness or lack of juveniles in the samples.Foram capturados 459 exemplares de Atlantoraja cyclophora na costa do Rio Grande do Sul entre as latitudes 30°40'S e 34°30'S, em dois cruzeiros realizados respectivamente no inverno de 2001 e no verão/outono de 2002, com rede de arrasto de fundo, operada entre 100 e 600 m de profundidade. A espécie ocorreu nas profundidades de 100 a 300 m, não havendo diferenças significativas na freqüência de ocorrência nem na abundância (CPUE; kg/hora) entre latitudes, estratos de profundidade em ambas estações do ano. A proporção sexual não foi significativamente diferente de 1:1 em todas as profundidades. Na área estudada a temperatura variou entre 10,0 °C e 17,6 °C e a salinidade entre 35,2 e 36,0 ppm. Não houve correlação entre CPUE e profundidade, temperatura e salinidade. O comprimento total médio das fêmeas (53,2 cm) foi significantemente maior que o dos machos (50,9 cm). Não houve diferença no comprimento total médio entre estações do ano, mas sim entre profundidades, sendo significantemente maiores nos estratos de 100 a 200 m. As distribuições de freqüências de comprimento total foram assimétricas, indicando ausência ou escassez de indivíduos juvenis.

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“…Such a pattern has been also observed in other Rajidae, e.g. Raja radiata (Skjaeraasen & Bergstad, 2000) and Psammobatis extenta (Braccini & Chiaramonte, 2002).…”

Section: P R O O F Smentioning

confidence: 72%

Section: P R O O F Smentioning

confidence: 80%

Section: P R O O F Smentioning

confidence: 83%

Section: P R O O F Smentioning

confidence: 99%

See 2 more Smart Citations

Distribution, abundance and morphometry of Atlantoraja cyclophora (Regan, 1903) (Elasmobranchii: Rajidae) in southern Brazil, Southwestern Atlantic

Oddone¹,

Vooren²

2004

Neotrop. ichthyol.

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“…In the western South Atlantic, skate egg capsules have been described for Sympterygia, Atlantoraja and Psammobatis (Oddone & Vooren 2002;Braccini & Chiaramonte 2002;Mabragaña et al 2002;, even though for Sympterygia bonapartii (Mabragaña et al 2002) and Psammobatis extenta (Braccini & Chiaramonte 2002) the descriptions may be somewhat rudimentary and incomplete. However, all these descriptions have dealt with the gross morphology of the egg capsules and not with its microscopic structure.…”

Section: Introductionmentioning

confidence: 99%

Microscopic structure of the egg capsule of Atlantoraja cyclophora (Elasmobranchii: Rajidae: Arhynchobatinae)

Oddone

2005

Biota Neotrop.

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The microscopic structure of the egg capsules of Atlantoraja cyclophora, a species endemic to the Atlantic region of South America, is presented in this paper. In a transverse section, the dorsal face of the egg case is 70 in width, and is subdivided into four layers. Ventrally, the egg capsule wall is 60 wide and composed of three layers. Both faces are covered by prickles which render the egg capsule surface striated to the naked eye.Key words: rajoids, egg capsules , Atlantoraja cyclophora, oviparity. ResumoA estrutura microscópica da cápsula ovífera de Atlantoraja cyclophora, endêmica na região sul-americana do Atlântico, é apresentada neste artigo. Em seção transversal, a face dorsal da cápsula ovígera tem uma largura de 70 , e está subdividida em quatro camadas. Ventralmente, a parede da cápsula ovígera tem uma largura de 60 e é conformada por três camadas. Ambas as faces acham-se cobertas por protuberâncias, que fazem com que a superfície da cápsula seja estriada ao olho nu. Palavras

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Strongly structured populations and reproductive habitat fragmentation increase the vulnerability of the Mediterranean starry rayRaja asterias(Elasmobranchii, Rajidae)

Catalano

Crobe

Ferrari

et al. 2021

Aquatic Conservation

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1. The Mediterranean starry ray (Raja asterias) populations within the Mediterranean Sea are susceptible to high rates of bycatch in the multispecies trawl fisheries.Understanding its population structure and identifying critical habitats are crucial for assessing species vulnerability and setting the groundwork for specific management measures to prevent population decline. 2. To assess the population structure of R. asterias in the Mediterranean, the genetic variation in nine population samples at one mitochondrial marker and eight nuclear microsatellite loci was analysed. Moreover, 172 egg cases collected in the Strait of Sicily were identified at species level using integrated molecular and morphological approaches. 3. Genetic analyses revealed that the Mediterranean starry ray comprises three distinct units inhabiting the western, the central-western, and the central-eastern areas of the Mediterranean. An admixture zone occurs in the Strait of Sicily and the Ionian Sea, where individuals of the central-western and central-eastern population units intermingle. 4. The joint morphometric-genetic analyses of rajid egg cases confirmed the presence of more than one species in the admixture area, with a predominance of egg cases laid by R. asterias. DNA barcoding revealed that egg cases and embryos of R. asterias shared several haplotypes with adult individuals from the centralwestern and central-eastern Mediterranean Sea, revealing that females of both populations laid numerous eggs in this area. 5. According to these findings, detailed taxonomic determination of egg cases, when combined with seasonal migration studies, could improve the capability to Giusy Catalano, Valentina Crobe, and Alice Ferrari contributed equally to this work.

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Reproductive biology of Psammobatis extenta

Cited by 63 publications

References 18 publications

Distribution, abundance and morphometry of Atlantoraja cyclophora (Regan, 1903) (Elasmobranchii: Rajidae) in southern Brazil, Southwestern Atlantic

Distribution, abundance and morphometry of Atlantoraja cyclophora (Regan, 1903) (Elasmobranchii: Rajidae) in southern Brazil, Southwestern Atlantic

Microscopic structure of the egg capsule of Atlantoraja cyclophora (Elasmobranchii: Rajidae: Arhynchobatinae)

Strongly structured populations and reproductive habitat fragmentation increase the vulnerability of the Mediterranean starry rayRaja asterias(Elasmobranchii, Rajidae)

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