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Journal articles on the topic 'Sawsharks'

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Author: Grafiati

Published: 10 December 2022

Last updated: 29 January 2023

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1

Raoult, V., V. Peddemors, K. Rowling, and J. E. Williamson. "Spatiotemporal distributions of two sympatric sawsharks (Pristiophorus cirratus and P. nudipinnis) in south-eastern Australian waters." Marine and Freshwater Research 71, no. 10 (2020): 1342. http://dx.doi.org/10.1071/mf19277.

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Sawsharks are one of the least well-known groups of sharks globally, yet they are caught in large numbers in south-eastern Australia. In this study we assessed spatiotemporal patterns of distribution of two co-occurring species of sawsharks, namely the common sawshark (Pristiophorus cirratus) and the southern sawshark (Pristiophorus nudipinnis), to guide future research in this area. To identify where the animals may occur in greater numbers, this study used the major commercial fishery datasets in the region, containing nearly 180000 catch records from 1990 to 2017. Several general patterns were evident. Sawsharks occurred at shallower and deeper depths than previously thought, and their geographical range was larger than documented in previous studies. Depth distributions of both species overlapped, but P. cirratus appeared more common in deeper water (at depths up to 500m), with peak common sawshark catch rates at ~400m. Seasonal standardised catch patterns across fishing methods suggested that migrations from deeper to shallower waters may occur in the Australasian autumn and winter. The greatest concentration of sawsharks, inferred by standardised catch rates, occurred to the east and west of Bass Strait between Tasmania and mainland Australia. Although standardised catch rates of sawsharks declined in gill-net fisheries by ~30%, primarily in the Bass Strait and Tasmania, sawsharks appear to be caught at consistent rates since the 1990s, inferring a possible resilience of these sharks to current levels of fishing pressure.

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2

Raoult, Vincent, Troy F. Gaston, and Jane E. Williamson. "Not all sawsharks are equal: species of co-existing sawsharks show plasticity in trophic consumption both within and between species." Canadian Journal of Fisheries and Aquatic Sciences 72, no. 11 (November 2015): 1769–75. http://dx.doi.org/10.1139/cjfas-2015-0307.

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Despite the global distribution of sawsharks, little is known about their diets or their role in the marine biosphere. As species in higher trophic positions are generally considered to be more at risk to perturbations such as fishing, understanding their role in the food chain will enable better conservation and management strategies for these species. Two sawshark species (Pristiophorus cirratus, Pristiophorus nudipinnis) co-occur in waters off east Tasmania, Australia. This study determined the trophic positions of these sawsharks and whether they avoided competing with each other through resource partitioning. Isotopic analysis of muscle tissue revealed that P. cirratus and P. nudipinnis had significantly different trophic levels, with P. cirratus likely to have a diet of primary consumers and P. nudipinnis likely to have a piscivorous diet. Owing to their different isotopic signatures, it is also likely that the sawshark rostrum has multiple functions. Both species shifted to higher trophic levels during ontogeny. Maternal isotopic signatures were detectable in P. cirratus juveniles.

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3

Nevatte, Ryan J., and Jane E. Williamson. "The Sawshark Redemption: Current knowledge and future directions for sawsharks (Pristiophoridae)." Fish and Fisheries 21, no. 6 (September 14, 2020): 1213–37. http://dx.doi.org/10.1111/faf.12500.

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4

Nevatte, Ryan J., Jane E. Williamson, Barbara E. Wueringer, and Michael R. Gillings. "Contrasting patterns of population structure in commercially fished sawsharks from southern Australian waters." Reviews in Fish Biology and Fisheries 31, no. 2 (February 17, 2021): 359–79. http://dx.doi.org/10.1007/s11160-021-09640-4.

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5

Nevatte, Ryan J., Barbara E. Wueringer, Michael R. Gillings, and Jane E. Williamson. "Genetic and historical evidence of common sawsharks Pristiophorus cirratus in the waters of southern Queensland." Journal of Fish Biology 95, no. 5 (September 9, 2019): 1342–45. http://dx.doi.org/10.1111/jfb.14122.

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6

Burke, Patrick J., Vincent Raoult, Lisa J. Natanson, Timothy D. Murphy, Victor Peddemors, and Jane E. Williamson. "Struggling with age: Common sawsharks (Pristiophorus cirratus) defy age determination using a range of traditional methods." Fisheries Research 231 (November 2020): 105706. http://dx.doi.org/10.1016/j.fishres.2020.105706.

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7

Welten, Monique, Moya Meredith Smith, Charlie Underwood, and Zerina Johanson. "Evolutionary origins and development of saw-teeth on the sawfish and sawshark rostrum (Elasmobranchii; Chondrichthyes)." Royal Society Open Science 2, no. 9 (September 2015): 150189. http://dx.doi.org/10.1098/rsos.150189.

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A well-known characteristic of chondrichthyans (e.g. sharks, rays) is their covering of external skin denticles (placoid scales), but less well understood is the wide morphological diversity that these skin denticles can show. Some of the more unusual of these are the tooth-like structures associated with the elongate cartilaginous rostrum ‘saw’ in three chondrichthyan groups: Pristiophoridae (sawsharks; Selachii), Pristidae (sawfish; Batoidea) and the fossil Sclerorhynchoidea (Batoidea). Comparative topographic and developmental studies of the ‘saw-teeth’ were undertaken in adults and embryos of these groups, by means of three-dimensional-rendered volumes from X-ray computed tomography. This provided data on development and relative arrangement in embryos, with regenerative replacement in adults. Saw-teeth are morphologically similar on the rostra of the Pristiophoridae and the Sclerorhynchoidea, with the same replacement modes, despite the lack of a close phylogenetic relationship. In both, tooth-like structures develop under the skin of the embryos, aligned with the rostrum surface, before rotating into lateral position and then attaching through a pedicel to the rostrum cartilage. As well, saw-teeth are replaced and added to as space becomes available. By contrast, saw-teeth in Pristidae insert into sockets in the rostrum cartilage, growing continuously and are not replaced. Despite superficial similarity to oral tooth developmental organization, saw-tooth spatial initiation arrangement is associated with rostrum growth. Replacement is space-dependent and more comparable to that of dermal skin denticles. We suggest these saw-teeth represent modified dermal denticles and lack the ‘many-for-one’ replacement characteristic of elasmobranch oral dentitions.

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8

Weigmann, Simon, Ofer Gon, Ruth H. Leeney, Ellen Barrowclift, Per Berggren, Narriman Jiddawi, and Andrew J. Temple. "Revision of the sixgill sawsharks, genus Pliotrema (Chondrichthyes, Pristiophoriformes), with descriptions of two new species and a redescription of P. warreni Regan." PLOS ONE 15, no. 3 (March 18, 2020): e0228791. http://dx.doi.org/10.1371/journal.pone.0228791.

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9

Smith, Moya Meredith, Alex Riley, Gareth J. Fraser, Charlie Underwood, Monique Welten, Jürgen Kriwet, Cathrin Pfaff, and Zerina Johanson. "Early development of rostrum saw-teeth in a fossil ray tests classical theories of the evolution of vertebrate dentitions." Proceedings of the Royal Society B: Biological Sciences 282, no. 1816 (October 7, 2015): 20151628. http://dx.doi.org/10.1098/rspb.2015.1628.

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In classical theory, teeth of vertebrate dentitions evolved from co-option of external skin denticles into the oral cavity. This hypothesis predicts that ordered tooth arrangement and regulated replacement in the oral dentition were also derived from skin denticles. The fossil batoid ray Schizorhiza stromeri (Chondrichthyes; Cretaceous) provides a test of this theory. Schizorhiza preserves an extended cartilaginous rostrum with closely spaced, alternating saw-teeth, different from sawfish and sawsharks today. Multiple replacement teeth reveal unique new data from micro-CT scanning, showing how the ‘cone-in-cone’ series of ordered saw-teeth sets arrange themselves developmentally, to become enclosed by the roots of pre-existing saw-teeth. At the rostrum tip, newly developing saw-teeth are present, as mineralized crown tips within a vascular, cartilaginous furrow; these reorient via two 90° rotations then relocate laterally between previously formed roots. Saw-tooth replacement slows mid-rostrum where fewer saw-teeth are regenerated. These exceptional developmental data reveal regulated order for serial self-renewal, maintaining the saw edge with ever-increasing saw-tooth size. This mimics tooth replacement in chondrichthyans, but differs in the crown reorientation and their enclosure directly between roots of predecessor saw-teeth. Schizorhiza saw-tooth development is decoupled from the jaw teeth and their replacement, dependent on a dental lamina. This highly specialized rostral saw, derived from diversification of skin denticles, is distinct from the dentition and demonstrates the potential developmental plasticity of skin denticles.

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10

Raoult, V., V. Peddemors, and J. E. Williamson. "Biology of angel sharks (Squatina sp.) and sawsharks (Pristiophorus sp.) caught in south-eastern Australian trawl fisheries and the New South Wales shark-meshing (bather-protection) program." Marine and Freshwater Research 68, no. 2 (2017): 207. http://dx.doi.org/10.1071/mf15369.

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Two species of angel shark (Squatina australis, S. albipunctata) and two species of sawshark (Pristiophorus nudipinnis, P. cirratus) are frequently caught in south-eastern Australia. Little is known of the biology of these elasmobranchs, despite being caught as secondary target species in large numbers. The present study collected morphometric and reproductive data from sharks caught in shark-control nets, commercial fishing trawlers and research trawlers in south-eastern Australia. All four species had female-biased sexual size dimorphism, but growth curves between sexes did not differ. Male S. australis individuals were fully mature at ~800-mm total length, male P. nudipinnis at ~900mm, and male P. cirratus at ~800mm. Anterior pectoral margins could be used to determine total length in all species. No morphometric measurement could reliably separate Squatina spp. or Pristiophorus spp., although S. albipunctata over 1000-mm total length had larger eyes than did S. australis.

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11

Ebert, David A., and Gregor M. Cailliet. "Pristiophorus Nancyae, a New Species of Sawshark (Chondrichthyes: Pristiophoridae) from Southern Africa." Bulletin of Marine Science 87, no. 3 (July 1, 2011): 501–12. http://dx.doi.org/10.5343/bms.2010.1108.

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12

Moreira, Renan A., and Marcelo R. Carvalho. "Clasper Morphology of the Japanese Sawshark, Pristiophorus japonicus Günther, 1870 (Chondrichthyes: Elasmobranchii)." Anatomical Record 302, no. 9 (February 27, 2019): 1666–70. http://dx.doi.org/10.1002/ar.24082.

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13

Nevatte, R. J., B. E. Wueringer, D. E. Jacob, J. M. Park, and J. E. Williamson. "First insights into the function of the sawshark rostrum through examination of rostral tooth microwear." Journal of Fish Biology 91, no. 6 (October 16, 2017): 1582–602. http://dx.doi.org/10.1111/jfb.13467.

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14

Engelbrecht, Andrea, Thomas Mörs, Marcelo A. Reguero, and Jürgen Kriwet. "A new sawshark, Pristiophorus laevis, from the Eocene of Antarctica with comments on Pristiophorus lanceolatus." Historical Biology 29, no. 6 (November 21, 2016): 841–53. http://dx.doi.org/10.1080/08912963.2016.1252761.

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15

Gottfried, Michael D., and Joseph A. Rabarison. "First Mesozoic Gondwanan record of a sawshark (Chondrichthyes, Pristiophoriformes), from the Late Cretaceous of Madagascar." Journal of Vertebrate Paleontology 17, no. 4 (December 15, 1997): 750–51. http://dx.doi.org/10.1080/02724634.1997.10011022.

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16

Nevatte, R. J., J. E. Williamson, N. G. F. Vella, V. Raoult, and B. E. Wueringer. "Morphometry and microanatomy of the barbels of the common sawshark Pristiophorus cirratus (Pristiophoridae): implications for pristiophorid behaviour." Journal of Fish Biology 90, no. 5 (March 17, 2017): 1906–25. http://dx.doi.org/10.1111/jfb.13275.

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17

V, Murugan, and Muthulakshmi T. "Sharks in Sangam Literary Fishermen's Lives and Contemporary Fishermen's Lives." International Research Journal of Tamil 4, S-6 (July 16, 2022): 108–17. http://dx.doi.org/10.34256/irjt22s615.

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The Sangam literature consists of texts that explain the internal lives of peoples from five ancient Tamil land divisions. In this anthology, Neythal explains the life of the sea and the fishermen who are dependent on the sea and also describes the sea creatures of marine life. Records of fishes are also found among these species. 18 types of fish are found in this way. Similarly, the writer conducted a field survey of fishermen living in Pamban village in Rameswaram circle, Ramanathapuram district, and found 204 types of fish. The five types of fish found in Sangam literature are lobster fish, codfish, shark fish, swordfish, and sawshark fish, and they are found in the lives of modern fishermen. The main occupation of fishermen is fishing. These fishing methods were documented in Sangam literature by poets of the time. Sharks mentioned in Sangam literature are also found among fishermen living in four places: Pondicherry, Cuddalore District, Mandapam, and Pampan (Ramanathapuram District). Here, the names of these sharks, their types, their habitats, characteristics of sharks, hunting of sharks, food of sharks, breeding patterns, worship of sharks, and other uses of sharks have been investigated.

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18

Mollen, Frederik H., Barry W. M. van Bakel, and John W. M. Jagt. "A partial braincase and other skeletal remains of Oligocene angel sharks (Chondrichthyes, Squatiniformes) from northwest Belgium, with comments on squatinoid taxonomy." Contributions to Zoology 85, no. 2 (March 24, 2016): 147–71. http://dx.doi.org/10.1163/18759866-08502002.

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A detailed redescription of a chondrocranium from the basal Boom Clay Formation (Rupelian, Upper Oligocene) at the SVK clay pit, Sint-Niklaas (province of Oost-Vlaanderen, Belgium), previously assigned to the sawshark Pristiophorus rupeliensis, is presented. The chondrocranium is re-identified as that of an angel shark (Squatinidae), based on comparative anatomy of extant Squatina, inclusive of CT scans of Squatina africana, S. australis, S. dumeril, S. guggenheimand S. squatina, with different geographic distributions and representing all four angel shark clades as defined in a previous molecular study. Differential characters for chondrocrania listed in earlier accounts to discriminate angel shark species from the southwest Atlantic proved to be even more revealing when comparing angel sharks from different regions/clades. Despite this wide interspecific variation, the fossil chondrocranium compares well with modern Squatina, but differs in having a UUU-shaped ventral margin of the occipital region and rounded margins of the upper postorbital processes. The distal expansion of the upper postorbital processes present in modern species has not yet been observed in extinct squatinoids and might constitute a derived character for modern representatives only. Angel shark teeth and vertebrae are well known from the same basal deposit at the SVK clay pit, but Cenozoic squatinid taxonomy remains problematic. It is here discussed in detail for the Oligocene taxa S. angeloides, S. rupeliensisand S. beyrichi. For the time being, all SVK material is left in open nomenclature and referred to as Squatinasp.

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19

McKenzie, Valerie J., and J. N. Caira. "Three New Genera and Species of Tapeworms from the Longnose Sawshark, Pristiophorus cirratus, with Comments on Their Modes of Attachment to the Spiral Intestine." Journal of Parasitology 84, no. 2 (April 1998): 409. http://dx.doi.org/10.2307/3284503.

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20

Ebert, David A., and Hana A. Wilms. "Pristiophorus lanae sp. nov., a new sawshark species from the Western North Pacific, with comments on the genus Pristiophorus Müller & Henle, 1837 (Chondrichthyes: Pristiophoridae)." Zootaxa 3752, no. 1 (December 24, 2013): 86. http://dx.doi.org/10.11646/zootaxa.3752.1.7.

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21

Burke, Patrick J., Johann Mourier, Troy F. Gaston, and Jane E. Williamson. "Novel use of pop-up satellite archival telemetry in sawsharks: insights into the movement of the common sawshark Pristiophorus cirratus (Pristiophoridae)." Animal Biotelemetry 8, no. 1 (November 17, 2020). http://dx.doi.org/10.1186/s40317-020-00222-y.

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Abstract Background Understanding movement patterns of a species is vital for optimising conservation and management strategies. This information is often difficult to obtain in the marine realm for species that regularly occur at depth. The common sawshark (Pristiophorus cirratus) is a small, benthic-associated elasmobranch species that occurs from shallow to deep-sea environments. No information is known regarding its movement ecology. Despite this, P. cirrata are still regularly landed as nontargeted catch in the south eastern Australian fisheries. Three individuals were tagged with pop-up satellite archival tags (PSATs) off the coast of Tasmania, Australia, to test the viability of satellite tagging on these small elasmobranchs and to provide novel insights into their movement. Results Tags were successfully retained for up to 3 weeks, but movement differed on an individual basis. All three individuals displayed a post-release response to tagging and limited vertical movement was observed for up to 5–7 days post-tagging. Temperature loggers on the tags suggest the animals were not stationary but moved horizontally during this time, presumably in a flight response. After this response, continuous wavelet transformations identified diel vertical movements in one individual at cyclical intervals of 12- and 24-hour periods; however, two others did not display as clear a pattern. Temperature was not significantly correlated with movement in the study period. The deepest depths recorded during the deployments for all individuals was approximately 120 m and the shallowest was 5 m. Conclusions This study demonstrates that sawsharks can be successfully tagged by pop-up satellite archival tags. The data presented here show that sawsharks regularly move both horizontally and vertically in the water column, which was an unexpected result for this small benthic species. Additional research aimed at resolving the trophic ecology will help identify the drivers of these movements and help to better define the ecological, behavioural and physiological roles of these sharks in their ecosystems. These data describe a substantial ability to move in the common sawshark that was previously unknown and provides the first account of movement ecology on the family of sawsharks: Pristiophoridae.

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22

Burke, Patrick J., and Jane E. Williamson. "Using cone beamCTscans to reveal headfirst ingestion and possible prey manipulation tactics in sawsharks." Journal of Fish Biology, February 15, 2021. http://dx.doi.org/10.1111/jfb.14692.

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23

Guicharrousse-Vargas, Maurice, Jaime Villafaña, Jorge Carrillo-Briceño, Pablo Oyanadel-Urbina, Romina Figueroa, José Pérez-Marín, Marcelo Rivadeneira, and Jürgen Kriwet. "THE FIRST FOSSIL RECORD OF THE SAWSHARK PLIOTREMA (PRISTIOPHORIDAE) FROM THE NEOGENE OF THE SOUTH-EASTERN PACIFIC (CHILE)." Ameghiniana, 2021. http://dx.doi.org/10.5710/amgh.01.03.2021.3389.

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24

Wueringer, Barbara E., Marit Winther‐Janson, Vincent Raoult, and Tristan L. Guttridge. "Anatomy of the mechanosensory lateral line canal system and electrosensory ampullae of L orenzini in two species of sawshark (fam. P ristiophoridae)." Journal of Fish Biology, November 12, 2020. http://dx.doi.org/10.1111/jfb.14567.

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