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Tesis sobre el tema "Hammerhead sharks"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 20 de febrero de 2023

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1

Lowe, Christopher G. "Bioenergetics and swimming efficiency of juvenile scalloped hammerhead sharks, Sphyrna lewini, in Kaneohe Bay, Oahu, Hawaii." Thesis, University of Hawaii at Manoa, 1998. http://hdl.handle.net/10125/18160.

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The goal of this study was to determine the energetic requirements of juvenile scalloped hammerhead sharks (Sphyrna lewini) in Kaneohe Bay, Oahu, Hawaii using a multidisciplinary approach. A large flume/respirometer (635 1) was constructed to determine the critical swimming speeds (Ucrit )' swimming kinematics (tailbeat frequency, tailbeat amplitude, and stride length), and oxygen consumption rates (V02 ) of juvenile sharks over a range of swimming speeds (U). Swimming kinematics were also compared with unconstrained sharks in a seawater pond. These experiments indicated that tailbeat frequenc

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2

Gustafson, Johann A. "Hammerhead sharks (Sphyrnidae) of southeast Queensland: habitat and movements." Thesis, Griffith University, 2020. http://hdl.handle.net/10072/397639.

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Hammerhead sharks (Sphyrnidae) are iconic and charismatic species that have received little attention until more recently, resulting in knowledge gaps about life histories, habitats, behaviours and migratory drivers, mostly in the southern hemisphere such as Australian waters. Globally, shark populations are declining as many species extinction risk has increased under the threat of fishing and habitat degradation. Hammerhead shark (Sphyrnidae) populations are highly susceptible to human-induced pressure such as long lines and are currently undergoing severe declines, especially in Australia.

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3

Mara, Kyle Reid. "Evolution of the Hammerhead Cephalofoil: Shape Change, Space Utilization, and Feeding Biomechanics in Hammerhead Sharks (Sphyrnidae)." Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3502.

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The relationship between form and function is often used to elucidate the biological role of a structure. Hammerhead sharks offer a unique opportunity to study form and function through phylogeny. Because sphyrnid sharks display a range of cranial morphologies this group can be used to address questions about the evolution of cranial design and investigate the effects of changes in head morphology on feeding structures and bite force. Geometric morphometrics, volumetric analyses, morphological dissections, and phylogenetic analyses of the cephalofoil were used to gain insight into changes in c

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4

Abercrombie, Debra. "Efficient PCR-Based Identification of Shark Products in Global Trade: Applications for the Management and Conservation of Commercially Important Mackerel Sharks (Family Lamnidae), Thresher Sharks (Family Alopiidae) and Hammerhead Sharks (Family Sphyrnidae)." NSUWorks, 2004. http://nsuworks.nova.edu/occ_stuetd/131.

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Shark populations worldwide are suspected to be in severe decline due to domestic and international markets for trade in shark products, especially dried fins in Asian markets, and as a result of bycatch mortality in multi-species fisheries. The management of sharks on a species-specific basis has become imperative for shark conservation, particularly in regions where numerous species are heavily fished, because sharks with differing life-history characteristics respond differently to exploitation. However, many commercially exploited sharks are morphologically similar and not easily identifia

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5

Hayes, Christopher Glenn. "Investigating single and multiple species fisheries management: stock status evaluation of hammerhead (Sphyrna spp.) sharks in the western North Atlantic Ocean and Gulf of Mexico." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/30989.

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Three hammerhead sharks (Sphyrna spp.) are currently managed as part of the large coastal shark complex in the United States. Including multiple species in an assessment ignores the different stock dynamics of each individual species within the complex due to different life histories. This study completed individual assessments of scalloped (S. lewini), great (S. mokarran), and smooth (S. zygaena) hammerhead sharks in the U.S. Atlantic Ocean and Gulf of Mexico. Combined data for all three species and unclassified hammerhead sharks were also used to produce a stock assessment of the hammerhe

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6

Horn, Rebekah L. "Applying a Molecular Genetics Approach to Shark Conservation and Management: Assessment of DNA Barcoding in Hammerhead Sharks and Global Population Genetic Structuring in the Gray Reef Shark, Carcharhinus amblyrhynchos." NSUWorks, 2010. http://nsuworks.nova.edu/occ_stuetd/218.

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Chapter 1 DNA barcoding based on the mitochondrial cytochrome c oxidase subunit I (COI) gene sequence is emerging as a useful tool for identifying unknown, whole or partial organisms to species level. However, the application of only a single mitochondrial marker for robust species identification has also come under some criticism due to the possibility of erroneous identifications resulting from species hybridizations and/or the potential presence of nuclear-mitochondrial psuedogenes. The addition of a complementary nuclear DNA barcode has therefore been widely recommended to overcome these p

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7

McCallister, Michael Philip. "Abundance, Distribution, and Habitat Use of Sharks in Two Northeast Florida Estuaries." UNF Digital Commons, 2012. http://digitalcommons.unf.edu/etd/352.

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Sharks are considered top predators in many marine ecosystems, and can play an important role in structuring those communities. As a result, it is necessary to understand the factors that influence their abundance and distribution. This is particularly important as fishery managers develop fishery management plans for sharks that identify areas that serve as essential fish habitat (EFH). This includes nursery habitat where sharks are born and juveniles spend the early part of their life. However, our understanding of shark habitat use in the northeast Florida waters is limited. The goal of thi

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8

Ballesta, Artero Irene Maria. "Influence of the Estimator Selection in Scalloped Hammerhead Shark Stock Assessment." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/24819.

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In natural sciences, frequentist paradigm has led statistical practice; however, Bayesian approach has been gaining strength in the last decades. Our study assessed the scalloped hammerhead shark population on the western North Atlantic Ocean using Bayesian methods. This approach allowed incorporate diverse types of errors in the surplus production model and compare the influences of different statistical estimators on the values of the key parameters (r, growth rate; K carrying capacity; depletion, FMSY , fishing levels that would sustain maximum yield; and NMSY, abundance at maximum sustaina

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9

Kotas, Jorge Eduardo. "Dinâmica de populações e pesca do tubarão-martelo Sphyrna lewini (Griffith & Smith, 1834), capturado no mar territorial e zona econômica exclusiva do sudeste-sul do Brasil." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-08122015-105215/.

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O tubarão-martelo, Sphyrna lewini é um dos mais valiosos recursos marinhos, e o preço pago por suas barbatanas no mercado Asiático pode atingir acima dos U$ 100,00/kg. A análise da composição de tamanhos e idades nas capturas, o estudo do crescimento desta espécie de grande porte e a evolução temporal dos desembarques, indicaram que este recurso se encontra sobreexplotado no sudeste e sul do Brasil, como reflexo de diferentes modalidades pesqueiras atuando ao longo de todo o seu ciclo de vida e à baixa resiliência desta espécie à pesca, por apresentar um crescimento lento (L&#8734 = 329,12 c

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10

Nelson, Jennifer A. "Comparative evaluation of the extended and minimal hammerheads suggests a shared dynamic pathway." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3284472.

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11

BEZERRA, Natalia Priscila Alves. "Deslocamentos verticais e horizontais do tubarão martelo (Sphyrna lewini, Griffith & Smith, 1834) monitorados a partir do arquipélago de São Pedro e São Paulo, Brasil." Universidade Federal Rural de Pernambuco, 2013. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/6434.

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Submitted by (edna.saturno@ufrpe.br) on 2017-02-17T14:32:33Z No. of bitstreams: 1 Natalia Priscila Alves Bezerra.pdf: 2116155 bytes, checksum: 25ac05e8bfcb1edeee75fcfaf93d7ec7 (MD5)<br>Made available in DSpace on 2017-02-17T14:32:33Z (GMT). No. of bitstreams: 1 Natalia Priscila Alves Bezerra.pdf: 2116155 bytes, checksum: 25ac05e8bfcb1edeee75fcfaf93d7ec7 (MD5) Previous issue date: 2013-02-15<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>The hammerhead shark (Sphyrna lewini) has a circuntropical distribution, ranging from coastal and semi-oceanic tropical and temp

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12

Wray-Barnes, Alexander. "Age, growth and patterns of occurrence in smooth hammerhead sharks (Sphyrna zygaena) off the coast of New South Wales, Australia." Thesis, 2017. http://hdl.handle.net/1959.13/1353450.

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Masters Research - Master of Philosophy (MPhil)<br>Significant declines in the catch rates of smooth hammerhead sharks (Sphyrna zygaena) have recently been reported off the coast of New South Wales, Australia. Quantitative investigations on the life history and correlates of distribution of exploited marine species is fundamental in providing sound species management, as resulting quantifiable results can help determine how population structures are affected by fishing, and their capacity to recover from reduced stocks. This information is particularly important for commercially targeted anima

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13

Yeh, Shu-Yu, and 葉書妤. "Feeding ecology of two hammerhead shark species from northeastern Taiwan waters." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/x5mj3n.

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碩士<br>國立臺灣海洋大學<br>環境生物與漁業科學學系<br>105<br>Scalloped hammerhead (Sphyrna lewini), and smooth hammerhead shark (S. zygaena) are the top predators in the marine ecosystem. These two species have been listed on the Appendix Ⅱ and their stockstatus is of great concern by environmental groups. After in order to provide detail data to the ecosystem management in the future, this study use stomach composition analysis and stable isotope analysis to compare the diet between scalloped hammerhead (n= 474) and smooth hammerhead shark (n= 163), from Oct. 2009 to Jan. 2011 and Sep. 2015 to Nov. 2016. The resu

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14

Yun-SungChen and 陳昀嵩. "A Simulation Research of the Flow Field of the Head of Hammerhead Shark." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/s38sh2.

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15

WU, JIA-RONG, and 吳佳蓉. "Demographic analysis and risk assessment of the scalloped hammerhead shark in the Pacific Ocean." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/b3hn7u.

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碩士<br>國立高雄科技大學<br>漁業生產與管理系<br>107<br>The scalloped hammerhead shark, Sphyrna lewini, is a common by-catch species of tuna longline fishing in the Pacific Ocean. Due to the high value of its fins in the trade market, it is one of the most abundant fished shark species of catch. Concern over its population dynamics and developing appropriate methods to assess its stock status has increased urgently. This study developed a two-sex stage-based matrix model with Monte Carlo simulations to examine demography and population dynamics of scalloped hammerhead shark. The simulations indicate that, withou

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16

Santos, Catarina Casaca Neves dos. "Distribution patterns and habitat use of the smooth hammerhead shark (sphyrna zygaena) in the Atlantic Ocean." Master's thesis, 2017. http://hdl.handle.net/10451/30605.

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Tese de mestrado, Ecologia Marinha, Universidade de Lisboa, Faculdade de Ciências, 2017<br>The smooth hammerhead shark, Sphyrna zygaena, is a cosmopolitan pelagic shark mostly captured as bycatch by industrial longline fleets targeting swordfish in the inter-tropical Atlantic Ocean. Listed by the IUCN as “Vulnerable”, S. zygaena is currently under international protection. Nevertheless, the current information on life history, movement patterns, essential habitat and population dynamics is still scarce over most of its range. This study aimed to improve the knowledge on distribution patterns a

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17

YEN, MING-CHIH, and 顏銘志. "Application of biological reference point for management of the smooth hammerhead shark, Sphyrna zygaena, in the western North Pacific." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/f56e48.

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碩士<br>國立高雄海洋科技大學<br>漁業生產與管理研究所<br>106<br>The smooth hammerhead shark, Sphyrna zygaena, a top marine predator, is one of the most important species of the Taiwanese offshore commercial shark fisheries. However, very little is known about the stock status of the species. Currently, the per-recruit models have been applied to many elasmobranch populations which lack sufficient catch, effort, and abundance index data to conduct a full stock assessment. In these situations, such methods may provide the best available description of population status because they can be used to estimate biological r

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18

Chang, Che-hua, and 張哲華. "Establishing Non-Detriment Findings and sustainable use of the flora and fauna in the CITEs Appendix II : scalloped hammerhead shark caught in Taiwanese waters as an example." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/7637dd.

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碩士<br>國立中山大學<br>海洋科學系研究所<br>104<br>Scalloped hammerhead shark (SPL: Sphyrna lewini) is an important target species in Taiwanese costal shark fishery. The high value and demand of their fin, and K- selection’s life history, made the fish assessed as endangered species, and required urgent concern for its resource management. Non-Detriment Finding (NDF) is the key concept listed in CITES’s Resolution Conference 16.7 , which claimed that, “Export permits for specimens of species included in Appendices I and II shall be granted only when a Scientific Authority of the State of export has advised t

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