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Dissertations / Theses on the topic 'Dasyatis'

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Published: 4 June 2025
Last updated: 15 July 2025

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1

Tilley, Alexander. "Functional ecology of the southern stingray, Dasyatis americana." Thesis, Bangor University, 2011. https://research.bangor.ac.uk/portal/en/theses/functional-ecology-of-the-southern-stingray-dasyatis-americana(3ae181b5-ed75-4727-8fb5-b5b0239858ab).html.

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The global decline of large sharks has fuelled a rapidly expanding field of research into their ecological role within coastal and pelagic systems, yet the ecological importance of smaller mesopredatory elasmobranchs is largely unknown. The goal of this study was to evaluate the functional ecology of the southern stingray in a system of known predator abundance using wildlife surveys, acoustic tracking and stable isotope analysis. Elasmobranch community composition (number of species) and population size were estimated at Glovers Reef Atoll, Belize, and distribution was quantified according to
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2

Silva, Guelson Batista da. "Biologia pesqueira das raias Dasyatis guttata (bloch & schneider, 1801) e Dasyatis Americana Hildebrand & Schroeder, 1928, no Estado do CearÃ." Universidade Federal do CearÃ, 2005. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=11217.

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FundaÃÃo de Amparo à Pesquisa do Estado do CearÃ<br>As raias das espÃcies Dasyatis guttata e Dasyatis americana constituem importantes recursos pesqueiros no Estado do CearÃ. O objetivo geral desta DissertaÃÃo à estudar a biologia pesqueira dessas espÃcies com vistas ao uso das informaÃÃes como constituintes de eventuais medidas de gerenciamento de sua exploraÃÃo. Dentro desse contexto geral, foram abordados aspectos relacionados com a biometria e suas relaÃÃes morfomÃtricas, dieta alimentar e reproduÃÃo, quanto ao comprimento mÃdio na 1 maturidade sexual e fecundidade. As amostragens foram r
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3

Silva, Guelson Batista da. "Biologia pesqueira das raias Dasyatis guttata (Bloch & Schneider, 1801) e Dasyatis americana Hildebrand & Schroeder, 1928, no Estado do Ceará." reponame:Repositório Institucional da UFC, 2005. http://www.repositorio.ufc.br/handle/riufc/11423.

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SILVA, G. B. da. Biologia pesqueira das raias Dasyatis guttata (Bloch & Schneider, 1801) e Dasyatis americana Hildebrand & Schroeder, 1928, no Estado do Ceará. 2005. 108 f. Dissertação (mestrado em em Ciências Marinhas Tropicais) - Instituto de Ciências do Mar, Universidade Federal do Ceará, Fortaleza, 2005.<br>Submitted by Nadsa Cid (nadsa@ufc.br) on 2015-04-16T15:33:48Z No. of bitstreams: 1 2005_dis_gbdasilva.pdf: 1621421 bytes, checksum: 1631941eb2f0fb72810b887202109adf (MD5)<br>Approved for entry into archive by Nadsa Cid(nadsa@ufc.br) on 2015-04-16T15:34:06Z (GMT) No. of bitstreams: 1 200
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4

Choe, Keith Patrick. "Cation and acid transporters in a euryhaline elasmobranch (Dasyatis sabina)." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0009780.

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5

Ferer, Erin Jennifer. "Salinity effect on urea and TMAO levels in blood plasma of Atlantic stingray, Dasyatis sabina." [Pensacola, Fla.] : University of West Florida, 2007. http://purl.fcla.edu/fcla/etd/WFE0000099.

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6

Enzor, Laura Ann. "Venom toxicity and bioenergetics of the spine from Atlantic stingray, Dasyatis sabina." [Pensacola, Fla.] : University of West Florida, 2008. http://purl.fcla.edu/fcla/etd/WFE0000102.

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7

SÃtiro, Inah. "AbundÃncia de raias demersais apÃs proibiÃÃo de pesca de arrasto por embarccaÃÃes motorizadas na costa." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12944.

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A pesca de fauna acompanhante, o âbycatchâ, pode ser considerada uma das maiores ameaÃas à vida nos oceanos. A influÃncia das capturas de fauna acompanhante nos ecossistemas marinhos faz com que esta seja uma das questÃes de conservaÃÃo da natureza mais importantes atualmente. Por vÃrias dÃcadas existiu na costa de Fortaleza uma intensa atividade da pesca de arrasto de camarÃo, que acidentalmente capturava raias, com o uso de embarcaÃÃes motorizadas. Tal atividade foi proibida a partir de 2003, pela Portaria no 35 do MinistÃrio do Meio Ambiente (Instituto do Meio Ambiente e dos Recursos Natura
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8

Costa, Tiego Luiz de Ara?jo. "Projeto raia de fogo: aspectos populacionais da raia de fogo (Dasyatis marianae Gomes, Rosa & Gadig, 2000) e pesca de elasmobr?nquios no complexo recifal do Parracho de Maracaja?" Universidade Federal do Rio Grande do Norte, 2011. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12496.

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Made available in DSpace on 2014-12-17T14:02:01Z (GMT). No. of bitstreams: 1 TiegoLAC_DISSERT.pdf: 2534713 bytes, checksum: 03b88ab9e5892a0fca8b5b5ff0512692 (MD5) Previous issue date: 2011-07-09<br>The species Dasyatis marianae inhabits coastal areas associated with coral reefs, considered endemic to the northeast of Brazil, occurring from the State of Maranh?o to the south of Bahia. Specimens of this species are commonly sighted by divers and fishermen in the area of Maracaja? reefs, a complex reef that is part of the Environmental Protection Area of Coral Reefs (EPACR), which was developed
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9

Piermarini, Peter Marc. "Extra-renal mechanisms of osmotic and acid/base regulation in a euryhaline elasmobranch (Dasyatis sabina)." [Gainesville, Fla.] : University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE1000153.

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Thesis (Ph. D.)--University of Florida, 2002.<br>Title from title page of source document. Document formatted into pages; contains xiii, 146 p.; also contains graphics. Includes vita. Includes bibliographical references.
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10

Costa, Tiego Luiz de Ara?jo. "Projeto raia de fogo: ecologia e filogeografia de Dasyatis marianae Gomes, Rosa & Gadig 2000." PROGRAMA DE P?S-GRADUA??O EM ECOLOGIA, 2016. https://repositorio.ufrn.br/jspui/handle/123456789/21837.

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Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-01-27T13:44:03Z No. of bitstreams: 1 TiegoLuizDeAraujoCosta_TESE.pdf: 3066366 bytes, checksum: 4860e49e936d8cde58fdd81a4536818d (MD5)<br>Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-01-31T14:57:47Z (GMT) No. of bitstreams: 1 TiegoLuizDeAraujoCosta_TESE.pdf: 3066366 bytes, checksum: 4860e49e936d8cde58fdd81a4536818d (MD5)<br>Made available in DSpace on 2017-01-31T14:57:47Z (GMT). No. of bitstreams: 1 TiegoLuizDeAraujoCosta_TESE.pdf: 3066366 bytes, checksum: 4860e49e936d8cde58fd
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11

Gilliam, David S. "The Diet and Feeding Habits of the Southern Stingray, Dasyatis americana, in Tropical Shallow Marine Habitats." NSUWorks, 1991. http://nsuworks.nova.edu/occ_stuetd/362.

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The diet and feeding habits of the southern stingray, Dasyatis americana, were investigated through aerial surveys, land-based observations, and quantitative analysis of stomach contents. The field research was conducted in the Exuma Cays Land and Sea Park, central Bahamas. Systematic aerial surveys and the land-based observations were made to determine population density and feeding periodicity in terms of time or tidal phase. In August, 1989, systematic surveys were flown over two cays in the Park; a 12 km2 area around Waderick Wells Cay and a 21km2 area around Shroud Cay. Both survey areas
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12

Palmeira, Ana Rita Onodera. "Biologia reprodutiva da raia dasyatis guttata (Bloch & Schneider, 1801) (Myliobatiformes: Dasyatidae) no litoral do Pará." Universidade Federal da Paraí­ba, 2012. http://tede.biblioteca.ufpb.br:8080/handle/tede/4145.

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Made available in DSpace on 2015-04-17T14:55:32Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 3402064 bytes, checksum: 85b25b7cb2762709c6ff9c0a515b3170 (MD5) Previous issue date: 2012-08-31<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>Camara beach is located in an Amazonian estuary in Pará State, northern Brazil, where fishing is a traditional activity and there is capture of several species of rays. The longnose stingray, Dasyatis guttata, is the most common in the catches, and as regional information on its biology is scarce, this study aimed to investigate
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13

Cowley, Paul D. (Paul Denfer) 1964. "The taxonomy and life history of the blue stingray, Dasyatis marmorata capensis (Batoidea : Dasyatidae) from Southern Africa." Thesis, Rhodes University, 1990. http://hdl.handle.net/10962/d1001959.

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The blue stingray, Dasyatis marmorata capensis is an important recreational shore angling species, especially amongst tournament anglers, in South Africa. The taxonomy and aspects of the biology of this species were investigated from specimens collected between March 1987 and May 1989, from various localities along the southern African coastline. Morphological comparisons were made between Dasyatis pastinaca, Dasyatis marmorata and the local variety. The results indicated that the local variety is different to D. pastinaca in colouration, disc length size, and vertebral and radial counts. The
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14

Marion, Camila. "Função da Baía de Todos os Santos no ciclo de vida da Arraia-branca,Dasyatis guttata (Elasmobranchii: Dasyatidae)." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/21/21134/tde-22072015-154346/.

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Dasyatis guttata é a espécie de raia mais abundante na Baía de Todos os Santos (BTS, Nordeste do Brasil), com um descarregamento pesqueiro atingindo a ordem de 900 t ao ano. A espécie também representa um dos principais componentes do nécton da BTS. Apesar dessa importância econômica e ecológica, não há informações sobre a dinâmica temporal e espacial, ecologia e biologia da espécie e a importância do uso dessa baía para a espécie. O objetivo do presente estudo foi descrever a utilização da BTS pela raia D. guttata, durante seu ciclo de vida (isto é, se a área é utilizada pela espécie para a r
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15

Corcoran, Mark John. "The Influence of Supplemental Feeding on the Movement Patterns of the Southern Stingray, Dasyatis americana, at Grand Cayman, Cayman Islands." NSUWorks, 2006. http://nsuworks.nova.edu/occ_stuetd/136.

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There are currently over 300 sites in nearly 40 countries where a variety of marine animals are provided supplemental food by humans. The influence of this supplemental feeding on the behavior, physiology, growth, reproduction and movements of the animals involved is seldom known. Intentional supplemental feeding of the southern stingray, Dasyatis americana, has occurred at Stingray City (SC) and Stingray City Sandbar (SCS) at Grand Cayman since 1986. There are no specific regulations governing the feeding of D. americana at Grand Cayman, and neither the species nor the feeding sites are affor
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16

MELO, Andressa Carolina Mendes de. "Biologia reprodutiva e pesca da Raia Dasyatis guttata (Block & Schneider, 1801) (Elasmobranchii: Dasyatidae) na plataforma continental de Pernambuco, Brasil." Universidade Federal Rural de Pernambuco, 2016. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/7082.

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Submitted by Mario BC (mario@bc.ufrpe.br) on 2017-10-20T13:36:44Z No. of bitstreams: 1 Andressa Carolina Mendes de Melo.pdf: 4203208 bytes, checksum: 432623f83a73f116a6b91b0c59dcf383 (MD5)<br>Made available in DSpace on 2017-10-20T13:36:44Z (GMT). No. of bitstreams: 1 Andressa Carolina Mendes de Melo.pdf: 4203208 bytes, checksum: 432623f83a73f116a6b91b0c59dcf383 (MD5) Previous issue date: 2016-02-29<br>Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>In the coast of Pernambuco, Brazil's n
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17

Gianeti, Michel Donato. "Reprodução, alimentação, idade e crescimento de Dasyatis guttata (Bloch & Schneider, 1801) (Elasmobranchii; Dasyatidae) na região de Caiçara do Norte - RN." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/21/21131/tde-19042012-145635/.

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A costa do município Caiçara do Norte - RN, na região Nordeste do Brasil, é uma reconhecida área de berçário para a raia Dasyatis guttata, onde são capturados indivíduos de ambos os sexos e de diferentes tamanhos. Como as informações biológicas sobre a espécie são escassas, o presente trabalho teve como objetivo investigar a biologia reprodutiva, a dieta, e os padrões de crescimento e idade de D. guttata nesta área. Indivíduos jovens, incluindo neonatos, foram mais freqüentes nas capturas. Dasyatis guttata se reproduz durante o ano todo, mas com maior atividade reprodutiva na época mais seca.
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18

Ould, El Kebir Mohamed Vall. "Etudes biologique et biochimique (acides gras) sur trois espèces de raies de l'Atlantique Est Tropical : Dasyatis marmorata, Rhinobatos cemiculus et Rhinoptera marginata." Aix-Marseille 3, 2001. http://www.theses.fr/2001AIX30052.

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L'étude de la biologie de trois espèces de raies du Littoral Mauritanien Dasyatis mannorata, Rhinoptera marginata et Rhinobatos cemiculus a porté sur la structure de populations, la croissance et le cycle de reproduction. Ce travail permet d'obtenir les premières données scientifiques fiables pouvant servir de base à une gestion rationnelle d'une ressource économiquement importante mais précédemment mal connue. L'analyse de la composition en acides gras par l'utilisation de la chromatographie en phase gazeuse (CG) et par le couplage CG/SM a permis, quant à elle, d'identifier et de nommer cinqu
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NUNES, Ilka Siqueira Lima Branco. "Ecologia da raia, Dasyatis americana (Hildebrand & Schroeder, 1928), na Região Metropolitana do Recife - PE e na ReBio Atol das Rocas - Brasil." Universidade Federal Rural de Pernambuco, 2015. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/6548.

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Submitted by (edna.saturno@ufrpe.br) on 2017-02-23T13:49:46Z No. of bitstreams: 1 Ilka Siqueira Lima Branco Nunes.pdf: 2141818 bytes, checksum: 9aa7bf11d864f1e1ce580f338251fe3c (MD5)<br>Made available in DSpace on 2017-02-23T13:49:46Z (GMT). No. of bitstreams: 1 Ilka Siqueira Lima Branco Nunes.pdf: 2141818 bytes, checksum: 9aa7bf11d864f1e1ce580f338251fe3c (MD5) Previous issue date: 2015-05-29<br>The south stingray is commonly captured as by-catch in different fisheries, not only in Brazil but also in some parts of South America, and due to the deficiency of available data, there is now a c
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20

Guilherme, Vasconcelos de Oliveira Paulo. "Biologia reprodutiva dos tubarões Carcharhinus falciformis, C. plumbeus, Pseudocarcharias kamoharai e ocorrências do Rinchodon typus, no Atlântico Tropical e ecologia da raia Dasyatis americana, na Rebio Rocas - Brasil." Universidade Federal de Pernambuco, 2008. https://repositorio.ufpe.br/handle/123456789/8032.

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Made available in DSpace on 2014-06-12T22:56:37Z (GMT). No. of bitstreams: 2 arquivo1305_1.pdf: 3126267 bytes, checksum: e8a5e32ac8107ccff1b4cbd2fbf9c06e (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2008<br>Universidade do Estado da Bahia<br>O presente trabalho relata a biologia de 3 espécies de tubarões, o Carcharhinus falciformis, Carcharhinus plumbeus e o Pseudocarcharias kamoharai, além da ecologia da raia prego, Dasyatis americana. Primeiramente foi estudada a biologia reprodutiva do C. falciformis, sendo examinado um total de 9
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21

Ponte, Dário Dinis Sousa. "Ecologia alimentar e biometria de duas espécies de raias de espinho dos Açores : uma análise ecológica e perspetiva para turismo subaquático." Master's thesis, 2015. http://hdl.handle.net/10400.3/3404.

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Dissertação de Mestrado em Gestão e Conservação da Natureza.<br>O presente estudo descreve a ecologia alimentar de duas espécies de ratões que ocorrem nos Açores, Dasyatis pastinaca e Myliobatis aquila. Ambas são espécies costeiras comuns, associadas a fundos arenosos, lodosos e rochosos para alimentação, desde águas pouco profundas até mais de 200 metros. A composição da dieta que aqui é descrita baseia-se na análise do conteúdo estomacal de 33 exemplares (Dasyatis pastinaca 23, Myliobatis aquila 10) coletados através da pesca submarina entre junho e outubro de 2010, em três locais diferentes
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