Mating Behavior of Southern Stingrays, Dasyatis americana (Dasyatidae)

Chapman, Demian D.; Corcoran, M J; Harvey, Guy; Malan, S.; Shivji, Mahmood S.

doi:10.1023/a:1027332113894

Cited by 63 publications

(20 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results also suggest that ovarian development probably speeds up in the later stages of pregnancy, and that females are probably able to ovulate soon after parturition. This condition has been observed in other studies of the pelagic stingray and in other dasyatids (Capapé 1993;Hemida et al 2003;Chapman et al 2003;Janse and Schrama 2010).…”

Section: Discussionsupporting

confidence: 81%

Reproductive biology of the pelagic stingray, Pteroplatytrygon violacea (Bonaparte, 1832), in the equatorial and south-western Atlantic Ocean

Véras

Hazin

Branco-Nunes

et al. 2014

Mar. Freshwater Res.

View full text Add to dashboard Cite

From October 2005 to March 2010, a total of 480 pelagic stingray, Pteroplatytrygon violacea, specimens, 188 females and 292 males (0.64 female : 1 male), were taken in the equatorial and south-western Atlantic by the commercial tuna longline fishery and their reproductive biology was studied. Disc widths (DW) ranged from 28.0 to 66.0 cm for females and from 34.0 to 59.6 cm for males. Size at first sexual maturity was estimated at ~48.0 cm DW (first pregnant female) for females and ~41.0 cm DW for males. Ovarian fecundity, considering only follicles larger than 0.5 cm in diameter, ranged from 1 to 17 follicles per female, while the uterine fecundity of embryos in pregnant females in Stages 2 and 3 ranged from 1 to 5 embryos per female. The sex ratio between the embryos was almost equal (1.08 female : 1 male) and the size at birth was 19.0 cm DW.

show abstract

Section: Discussionsupporting

confidence: 81%

Reproductive biology of the pelagic stingray, Pteroplatytrygon violacea (Bonaparte, 1832), in the equatorial and south-western Atlantic Ocean

Véras

Hazin

Branco-Nunes

et al. 2014

Mar. Freshwater Res.

View full text Add to dashboard Cite

show abstract

“…The absence of one clasper has repercussions during reproduction, even though when an elasmobranch male must insert one of the claspers during copulation (Carrier et al 1994, Chapman et al 2003. The lack of a clasper potentially reduces the success of the reproduction process of the single-clasper specimens (Torres-Huerta et al 2015).…”

Section: Discussionmentioning

confidence: 99%

First record of a single-clasper specimen of Pseudobatos percellens (Elasmobranchii: Rhinopristiformes: Rhinobatidae) from the Caribbean Sea, Venezuela

Ehemann¹,

González-González²

2018

Acta Ichthyol. Piscat.

View full text Add to dashboard Cite

Documented cases of abnormalities in elasmobranchs worldwide are more often reported for sharks than their close relatives, the skates and rays. This report confirms the occurrence of a chola guitarfish, Pseudobatos percellens (Walbaum, 1792), caught off Margarita Island, Venezuela, showing morphological abnormalities on the right side of the body, including the absence of one clasper. This is the first record of an anomalous singleclasper case in the Caribbean Sea region.

show abstract

“…A mating season modification of teeth from flat (for crushing food) to needle-like teeth in males is known from several ray species, for example Dasyatis americana, Urolophus halleri and Urotrygon microphthalmum. This morphological modification of teeth is linked to mating behavior in these species (Chapman et al 2003;Nordell 1994;Rangel et al 2016). If similar reasons increase the number of upper tooth cusplets in males of E. spinax remain speculative.…”

Section: Intraspecific Dental Variationmentioning

confidence: 99%

Intraspecific dental variations in the deep-sea shark Etmopterus spinax and their significance in the fossil record

Straube

Pollerspöck²

2020

Zoomorphology

View full text Add to dashboard Cite

An important character on several taxonomic levels for shark identification is the tooth morphology. Sharks show a variety of highly specialized dentitions reflecting adaptations to their feeding habits. Intraspecific variation of tooth morphology such as sexual or ontogenetic dimorphism is poorly known in many species, even though tooth morphology plays a decisive role in the characterization of the fossil record of sharks, which comprises mostly fossil teeth. Here we analyzed the dentition of 40 jaws of the Velvet Belly Lantern Shark Etmopterus spinax and identified ontogenetic and sexual dimorphic characters such as total number of teeth, number of upper teeth, cusplet numbers in upper jaw teeth and width of lower jaw teeth. Dimorphic characters may reduce intraspecific competition for food, as E. spinax segregates by sex and size and may allow for identifying the male sex. The lower jaw tooth height, a sexually non-dimorphic character, was used to re-calculate the total length of specimens, which represents the first such approach for a squaliform shark. Results derived from the extant E. spinax are subsequently applied to fossil Etmopterus sp. teeth (Miocene) to gain individual information such as sex or size, but also characterize the extinct population from the excavation site by a size distribution profile in comparison to data from extant populations. This approach indicates the presence of multiple ontogenetic stages in the extinct population.

show abstract

Mating Behavior of Southern Stingrays, Dasyatis americana (Dasyatidae)

Cited by 63 publications

References 14 publications

Reproductive biology of the pelagic stingray, Pteroplatytrygon violacea (Bonaparte, 1832), in the equatorial and south-western Atlantic Ocean

Reproductive biology of the pelagic stingray, Pteroplatytrygon violacea (Bonaparte, 1832), in the equatorial and south-western Atlantic Ocean

First record of a single-clasper specimen of Pseudobatos percellens (Elasmobranchii: Rhinopristiformes: Rhinobatidae) from the Caribbean Sea, Venezuela

Intraspecific dental variations in the deep-sea shark Etmopterus spinax and their significance in the fossil record

Contact Info

Product

Resources

About