Dental abnormalities of the southern thorny skate Amblyraja doellojuradoi (Chondrichthyes, Rajidae)

Delpiani, Gabriela; Figueroa, Daniel E.; Mabragaña, Ezequiel

doi:10.4067/s0718-19572012000100012

Cited by 10 publications

(14 citation statements)

References 2 publications

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“…Generally, species that consume fish have sharp teeth to capture these prey items more successfully (Feduccia & Slaughter, 1974). However, teeth of A. doellojuradoi were sharper in males than in females, in opposition to the difference reported in diet (Delpiani et al , 2012). Thayer et al (1973) proposed that prey consumption is determined by the calorific value.…”

Section: Discussionmentioning

confidence: 57%

Feeding ecology of the southern thorny skate,Amblyraja doellojuradoion the Argentine Continental Shelf

2013

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The feeding ecology of the southern thorny skate, Amblyraja doellojuradoi, on the Argentine Continental Shelf was evaluated using generalized linear models. Amblyraja doellojuradoi preyed mainly on crabs (85.41% index of relative importance (IRI)) and to a lesser extent on polychaetes (4.98% IRI), teleosts (3.28% IRI), isopods (2.03% IRI), other crustaceans (1.52% IRI) and other invertebrates (2.78% IRI). As individuals increased in size, the consumption of crabs also increased and the consumption of polychaetes and other invertebrates decreased. The study area was divided into a northern (36°–43°S) and a southern (43°–50°S) region. Regarding the latitude of capture, it was observed that A. doellojuradoi mainly fed on crabs in the north and on fish, isopods and other crustaceans in the south. Females of A. doellojuradoi had a stronger preference for fish and isopods than males. As to sexual maturity, immatures fed more on polychaetes and other crustaceans than did mature. The ontogenetic change in feeding habits could be attributed to body size and an increasing ability to capture larger prey, rather than to food availability. However, this point cannot be confirmed because little is known about the benthic fauna of this area.

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Section: Discussionmentioning

confidence: 57%

Feeding ecology of the southern thorny skate,Amblyraja doellojuradoion the Argentine Continental Shelf

2013

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“…Most dental studies have focused mainly on brief and incomplete descriptions of the external and internal morphology of the teeth and are restricted to reports of the number of teeth, arrangement and absence or presence of dental sexual dimorphism (Feduccia & Slaughter, ; Du Buit, ; Sáez & Lamilla, , ). A previous, qualitative analysis of the dentition of A. doellojuradoi showed that this species has a gradient monognathic heterodonty (Delpiani et al ., ), meaning that there is a gradual variation in the tooth morphology along the parallel axis of the jaw. Amblyraja radiata has the same sort of dentition, according to the description given by Herman et al .…”

Section: Discussionmentioning

confidence: 99%

“…In the south‐west Atlantic Ocean Amblyraja doellojuradoi (Pozzi 1935) is the most common species of its genus, but little is known of its biology so far. Only recently have there been analyses of its diet (Delpiani et al ., ), reproduction (Delpiani, ) and particular dental anomalies (Delpiani et al ., ). The last study includes a brief qualitative description of the dentition, finding that A. doellojuradoi has a gradient monognathic heterodonty.…”

Section: Introductionmentioning

confidence: 99%

Description and quantitative analysis of the dentition of the southern thorny skate Amblyraja doellojuradoi

Delpiani

Spath

Antoni

et al. 2017

Journal of Fish Biology

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A description of the tooth morphology of 234 jaws from the southern thorny skate Amblyraja doellojuradoi in the south-west Atlantic Ocean is given. Seven rows of teeth were selected and length and width of each tooth in these rows were measured. It was found that functional series corresponds to the third teeth and the average width and length of these teeth were compared among jaws, maturity stages, sexes and rows. Generalized linear models were used to determine the subset of measures that most contribute to explain the variability between groups. It was observed that males have longer teeth than females, but the teeth of females are wider. These differences are attributed to reproductive behaviour, in which males bite females to hold them during copulation. This study provides a description of the teeth of A. doellojuradoi, supplying a valuable tool for identification of species. In addition, the establishment of the main variations observed in the dentition, improves the understanding of the species' biology.

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“…the Zearaja and Dipturus complex (Last & Gledhill, 2007). Recently, a comprehensive study of the clasper in three Amblyraja species have been published (Delpiani et al, 2012) contributing to enhance the species diagnosis as a major component of genus morphology.…”

Section: Distributionmentioning

confidence: 99%

“…Structural consistencies can be detected in the clasper internal cartilages within A. frerichsi and A. doellojuradoi, A. hyperborea (Collett 1879) and A. radiata (Donovan 1808) (Stehmann, 1970;Hulley, 1972;Delpiani et al, 2012); especially in the shape of the dorsal terminal 2 (dt2) and 4 (dt4); the ventral terminal and the accessory terminal 1 (at1) and 2 (at2) cartilages. But the shape and disposition of dorsal terminal 1 (dt1) and 2 (dt2) cartilages are slightly different; and these differences together may be used in the species diagnosis.…”

Section: Distributionmentioning

confidence: 99%

Biology, Taxonomy and Distribution of south-east Pacific Cartilaginous Fishes

Bustamante¹

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Cartilaginous fishes (formerly Class Chondrichthyes) belong to an ancient, highly conserved taxonomic group. Despite the evolutionary success of the group, of which there are over 1,000 extant species, many are now threatened with extinction, regionally or globally, primarily as a result of human activities. The main reason for the susceptibility of these species is the K-selected lifehistory traits that characterise many species of cartilaginous fishes such as, slow growth, relatively late maturity, low fecundity and a low rate of potential population increase.Cartilaginous fishes are generally predators that occupy the upper levels of marine food webs. They are naturally rare compared with other fishes, but have a vital role in the maintenance of marine ecosystem balance. Their biological characters make them highly susceptible to population depletion as a result of anthropogenic activity, including targeted fisheries, bycatch and habitat loss or modification. The life history strategy of cartilaginous fish species suggests the need for conservative management measurements that ensure sustainability with compatible fishery activities.Cartilaginous fishes constitute an important component of the marine ecosystem in the southeast Pacific Ocean. Over 93 species of sharks, skates, rays and chimaeras inhabit Chilean waters and at least half of them are subjected to intense fishing pressure in a diverse range of fisheries.Many of these species are vulnerable to population collapse. Even though they are not directly targeted in commercial fisheries, they are caught as bycatch by longline, gillnet and trawl net fisheries within Chile's Exclusive Economic Zone. Limited biological information is available to assess the potential impacts that anthropogenic disturbance may produce in populations of cartilaginous fishes, and this thesis aims to improve our knowledge of the taxonomy, life history and fisheries of cartilaginous fishes commonly caught in Chilean waters.The cartilaginous ichthyofauna in Chile was assessed through extensive surveys conducted in coastal artisanal, small to medium scale fisheries and larger semi-industrial oceanic fisheries. Here we review the taxonomy and fishery biology from a relatively basic level (checklist of living species, morphological descriptions and biology) towards complex conservation issues (distribution, habitat use and fishery mortality). However, these results represent the first attempt to quantify the abundance and distribution ranges of sharks, skates and chimaeras commonly caught along the Chilean coast. New biological and ecological data have complemented actual knowledge of cartilaginous fish dynamics in relation to fishing activity in the south-east Pacific Ocean.As part of this thesis, three new species have been added to the Chilean cartilaginous fauna (Chapter 2): the spinetail mobula Mobula japanica, the eastern Pacific black ghostshark Hydrolagus -iimelanophasma and the thickbody skate Amblyraja frerichsi. The inclusion of these species improves identificatio...

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Dental abnormalities of the southern thorny skate Amblyraja doellojuradoi (Chondrichthyes, Rajidae)

Cited by 10 publications

References 2 publications

Feeding ecology of the southern thorny skate,Amblyraja doellojuradoion the Argentine Continental Shelf

Feeding ecology of the southern thorny skate,Amblyraja doellojuradoion the Argentine Continental Shelf

Description and quantitative analysis of the dentition of the southern thorny skate Amblyraja doellojuradoi

Biology, Taxonomy and Distribution of south-east Pacific Cartilaginous Fishes

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