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Dissertations / Theses on the topic 'Phocoena'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

Vaz, Ana Rita Correia. "Morfometria craniana do boto (Phocoena phocoena) na costa portuguesa." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/15925.

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Mestrado em Biologia Marinha<br>Eventos climáticos extremos poderão ter conduzido à instabilidade de habitats e em última instância à sua fragmentação, causando repercussões ainda visíveis nos predadores de topo, tais como o boto (Phocoena phocoena). Consequentemente, os indivíduos que não se adaptaram, tiveram de procurar novos habitats com as respetivas condições ideais, nomeadamente os indivíduos da população de botos do Atlântico Este (norte e sul da Baía de Biscaia). O presente estudo focou-se em indivíduos da costa portuguesa (representando uma amostra da população residente a sul da Baí

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2

Gilles, Anita [Verfasser]. "Characterisation of harbour porpoise (Phocoena phocoena) habitat in German waters / Anita Gilles." Kiel : Universitätsbibliothek Kiel, 2009. http://d-nb.info/1019811080/34.

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3

Jepson, Paul David. "Pathology and toxicology of stranded harbour porpoises (Phocoena phocoena in UK waters." Thesis, Royal Veterinary College (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.406450.

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4

Graner, Florian. "Group structure and behaviour of the harbour porpoise Phocoena phocoena in Indre Sognefjord, Norway." Thesis, University of Liverpool, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399187.

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5

Learmonth, Jennifer Ann. "Life history and fatty acid analysis of harbour porpoises (Phocoena phocoena) from Scottish waters." Thesis, University of Aberdeen, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430404.

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Harbour porpoises stranded around the Scottish coast throughout the year, with fatal attacks by bottlenose dolphins and pathological conditions being the main causes of death, there has been an apparent increase in the number of porpoises dying due to pathological conditions and starvation in recent years, although there was no evidence of any overall trend in the annual number of stranded porpoises. Reproductive seasonality was found to occur and the mating and calving periods were estimated to take place between May and August, with gestation lasting approximately 11 months. Lactation appea

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6

Crossman, Carla Anne. "Population structure in harbour porpoises (Phocoena phocoena) of British Columbia and widespread hybridization in cetaceans." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43736.

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Harbour porpoises (Phocoena phocoena) are one of the most abundant small cetaceans in the world and, while they are extensively studied across most of their range, little is known about their biology in British Columbia, Canada. Recent management plans have identified a need to better understand the population structure of harbour porpoises in this region. I investigated the genetic population structure of harbour porpoises in British Columbia using mitochondrial DNA (mtDNA) and eight microsatellite loci. My findings are consistent with a single population of harbour porpoises inhabiting the c

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7

Faulkner, Jacqueline. "Study of the cranial sinus nematode, Stenurus minor (Metastrongyloidea), in the harbour porpoise, Phocoena phocoena." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23272.

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Seventy-eight harbour porpoises, Phocoena phocoena, (33 females, 45 males) were obtained from the summer (June-September) cod fishery incidental-by-catch in the Gulf of St. Lawrence, and examined for the presence of cranial sinus nematodes. This is the first quantitative and in-depth study of the distribution of Stenurus minor (Kuhn, 1829) Baylis and Daubney, 1925 in the cranium of by-caught harbour porpoises. Stenurus minor was present in the cranial sinuses of all adult porpoises ($>$1yr, n = 66, x = 2362, range 87-8920) and absent in all young-of-the-year ($<$1yr, n = 12). Only fifth-stage

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8

Simard, Manon. "Population dynamics of Anisakis simplex in harbour porpoise, Phocoena phocoena, from the Gulf of St. Lawrence." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq29787.pdf.

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9

Dähne, Michael [Verfasser]. "Use of acoustic methods for the protection of harbour porpoises (Phocoena phocoena) in German Waters / Michael Dähne." Kiel : Universitätsbibliothek Kiel, 2014. http://d-nb.info/1052529399/34.

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10

Goodwin, Lissa. "The ecology and conservation of the harbour porpoise (Phocoena phocoena) along the west coast of the UK." Thesis, University of Plymouth, 2007. http://hdl.handle.net/10026.1/1117.

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Whilst the harbour porpoise {Phocoena phocoena) is the most frequently observed cetacean in the UK, it is at risk from habitat degradation, pollution, incidental capture in fishing nets and anthropogenic disturbance. UK, European and international initiatives have highlighted the conservation need to obtain a better understanding of this species. This research, conducted over 5 years (1999-2004) aimed to further the scientific knowledge of the harbour porpoise in order to influence future conservation initiatives. Studies into the relative abundance, density, distribution, habitat use and beha

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11

Martins, Ana Isabel Duque. "Avaliação da situação actual dos botos (phocoena phocoena), na região entre a Lagoa de Albufeira e Sines, Portugal." Master's thesis, Universidade de Évora, 2004. http://hdl.handle.net/10174/15643.

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Analisaram-se os padrões de distribuição e de ocorrência dos botos na área entre a Lagoa de Albufeira e Sines. Caracterizou-se a actividade piscatória, identificaram-se as artes de pesca que capturam botos e efectuou-se a primeira avaliação do seu impacto na mortalidade da espécie na região. Os botos distribuem-se por toda a área de estudo, não homogeneamente, e ocorrem na região durante todo o ano. O tamanho médio dos grupos foi 3,1 (±1,65). As crias foram avistadas pela primeira vez em Junho e registou-se a sua presença em 40% dos grupos avistados. Os botos são capturados em redes de emalhar

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12

Metuzals, Kaija Irene. "Bycatch of harbour porpoise (Phocoena phocoena L.) in the North Sea : a case study of the Grimsby gillnet fleet." Thesis, University of Warwick, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247658.

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13

Björklund, Aksoy Simon. "Do potentially seal-safe pingers deter harbour porpoises (Phocoena phocoena) in the vicinity of gillnets and thereby reduce bycatch?" Thesis, Linköpings universitet, Biologi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-170512.

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Incidental bycatch in gillnets is a substantial threat to small cetaceans. Using Acoustic Deterrent Devices, “pingers”, have successfully reduced bycatch of harbour porpoises in gillnets. However, seals can use pingers as “dinner-bells” to easier find gillnets in order to raid and destroy them, further aggravating the existing conflicts between seals and coastal fisheries. Therefore, in the present study, the efficiency of two alleged “seal-safe” pingers, an experimental Banana pinger “SSB” and a Future Oceans F70 pinger “FO”, in deterring harbour porpoises from the vicinity of gillnets and th

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14

Jakobsson, Ellinor. "Status för den vanliga tumlaren (Phocoena phocoena) : En analys av tumlarens rödlistning och hot samt av betalningsviljan för att bevara tumlare." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-150251.

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The aim of this report was to establish what category the harbour porpoise is listed as on the Swedish national redlist as well as analyze what potential sub-criteria the species fulfills besides criteria already established. The aim was also to evaluate the willingness to pay for conservation of the harbour porpoise for the first time and make a comparison of the willingness to pay between geographic places where the harbour porpoise is currently existing and where it is not. The subpopulation of the harbour porpoise in Skagerrak-Kattegat is listed as vulnerable (VU) on the national redlist a

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15

Mahfouz, Céline. "An assessment of the chemical contamination and the diet changes of the harbou porpoise (Phocoena phocoena) stranded along the southern North Sea." Thesis, Littoral, 2014. http://www.theses.fr/2014DUNK0433/document.

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De part l'importance et la diversité des pressions anthropiques en mer du Nord, les mammifères marins en tant que prédateurs supérieurs se trouvent de plus en plus exposés à ces activités (trafic maritime, activités industrielles et portuaires, surpêche, pollution chimique, etc.). Les campagnes d'observation SCANS et SCANS II mises en place en 1994 et 2005 pour estimer l'abondance des petits cétacés, ont mis en évidence un changement majeur dans la distribution du marsouin commun (Phocoena phocoena) en mer du Nord avec un déplacement du Nord vers le Sud. Ce changement peut être lié à une migra

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16

Cirillo, Lucia. "The nematode parasite fauna in three odontocete species: Phocoena phocoena, Lagenorhynchus albirostris, Lagenorhynchus acutus from Northern Scotland and its relationships with diet composition." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8091/.

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Food items and nematode parasites were identified from the stomachs of 42 individuals of Phocoena phocoena, 6 of Lagenorhynchus acutus and 8 of L. albirostris stranded off the coastal waters of Northern Scotland between 2004 and 2014. Post-mortem examinations have revealed heavy parasitic worm burdens. Four nematode species complex as Anisakis spp., Contracaeucum spp., Pseudoterronova spp., and Hysterothylacium spp. were recorded. Data on presence of the anisakid species in cetaceans, reported a significative relationship between the presence of Hysterothylacium and the month of host strandi

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17

Alfonsi, Eric. "Le marsouin commun et le phoque gris en mer d'Iroise et le long de la façade Atlantique française : génétique des populations et modifications de l'écosystème." Thesis, Brest, 2013. http://www.theses.fr/2013BRES0073/document.

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Les mammifères marins sont des espèces clés des écosystèmes. Ils subissent un nombre important de modifications de leur milieu qui nécessitent la mise en place de stratégie de conservation. Pour cela la connaissance de la structure des populations est primordiale. Une étude de génétique des populations a été menée sur deux espèces emblématiques de la mer d'Iroise. Pour le marsouin commun, espèce connaissant un retour le long des côtes françaises, nos travaux montrent, de manière inattendue, que ce retour est le résultat de deux déplacements différents et qu'il y a une hybridation entre les ind

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18

Kesselring, Tina [Verfasser], Ursula [Akademischer Betreuer] Siebert, and Ralph [Akademischer Betreuer] Brehm. "Analysis of the reproductive biology of harbour porpoises (Phocoena phocoena) from the North and Baltic Sea on a long-term basis / Tina Kesselring ; Ursula Siebert, Ralph Brehm." Hannover : Stiftung Tierärztliche Hochschule Hannover, 2019. http://d-nb.info/1191752755/34.

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Kesselring, Tina Verfasser], Ursula [Akademischer Betreuer] Siebert, and Ralph [Akademischer Betreuer] [Brehm. "Analysis of the reproductive biology of harbour porpoises (Phocoena phocoena) from the North and Baltic Sea on a long-term basis / Tina Kesselring ; Ursula Siebert, Ralph Brehm." Hannover : Stiftung Tierärztliche Hochschule Hannover, 2019. http://nbn-resolving.de/urn:nbn:de:gbv:95-112719.

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20

Winship, Arliss J. "Estimating the impact of bycatch and calculating bycatch limits to achieve conservation objectives as applied to harbour porpoise in the North Sea." Thesis, St Andrews, 2009. http://hdl.handle.net/10023/715.

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21

Embling, Clare B. "Predictive models of cetacean distributions off the west coast of Scotland." Thesis, University of St Andrews, 2008. http://hdl.handle.net/10023/640.

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The main purpose of this study was to produce and test the reliability of predictive models of cetacean distributions off the west coast of Scotland. Passive acoustic and visual surveys were carried out from platforms of opportunity between 2003 and 2005. Acoustic identifications were made primarily of harbour porpoises (Phocoena phocoena), delphinids, and sperm whales (Physeter macrocephalus). Generalised Additive Models (GAMs) were used to relate species’ distributions to a range of environmental variables over a range of temporal and spatial scales. Predictive models of delphinid distributi

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22

Camarão, Bárbara Costa. "Estudo da reprodução de pequenos cetáceos através da morfologia do ovário." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/21371.

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Mestrado em Biologia Marinha<br>O aumento da pressão humana sobre os ecossistemas marinhos tem agravado os impactos antropogénicos a que os pequenos cetáceos estão sujeitos, tornando fundamental o estudo dos parâmetros de história de vida e da dinâmica populacional das espécies, que suportem a elaboração de medidas de conservação e mitigação eficazes. O presente trabalho teve como principal objetivo caraterizar o estado reprodutor das fêmeas de Golfinho-comum, Golfinho-riscado, Boto e Roaz, da costa continental portuguesa, uma vez que são as espécies com maiores taxas de arrojamento. Foram u

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23

Pinheiro, Glennda Alessandra Jorge. "Contribuição para o estudo da dieta de pequenos cetáceos em Portugal Continental." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/21949.

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Mestrado em Biologia Marinha<br>O Golfinho-comum (Delphinus delphis), o Golfinho-riscado (Stenella coeruleoalba), o Roaz (Tursiops truncatus) e o Boto (Phocoena phocoena) são as espécies de pequenos cetáceos mais abundantes na costa portuguesa. Algumas das suas presas principais apresentam um elevado interesse comercial estando por isso, muitas vezes, sujeitos a capturas acidentais em artes de pesca. Estudos sobre os hábitos alimentares destas espécies são importantes para conhecer a ecologia alimentar e a biologia das relações predador-presa, através de índices de importância numérica, ocorrê

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24

Schiller, Daniza Marcela Montserrat Molina. "Variação geográfica do boto-de-burmeister, Phocoena spinipinnis (Burmeister, 1865) (Cetacea : Phocoenidae) nas costas Atlântica e Pacífica da América do Sul." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2006. http://hdl.handle.net/10183/7985.

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Um total de 142 crânios do boto-de-Burmeister, Phocoena spinipinnis depositados em museus e coleções cientificas da Argentina, Brasil, Chile, Peru e Uruguai foram utilizados para explorar a variação geográfica em relação ao tamanho e forma do crânio de P. spinipinnis. Ademais, foi realizada uma caracterização oceanográfica da área de distribuição do boto-de- Burmeister através de dados históricos de temperatura, salinidade e oxigênio a 0 e 50m de profundidade na costa Atlântica e Pacifica. As idades dos animais foram obtidas pelas leituras das GLGs na dentina. A idade mais alta atingida por am

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25

Knoblock, Kenneth. "EVIDENCE THAT A RESTORED COLORADO RIVER DELTA IS CRITICAL HABITAT UNDER THE ENDANGERED SPECIES ACT FOR THE RECOVERY OF THE VAQUITA MARINO (Phocoena sinus) AND ITS IMPLICATIONS IN THE LEGAL,ECONOMIC, AND SOCIAL POLICY IN THE COLORADO RIVER." CSUSB ScholarWorks, 2018. https://scholarworks.lib.csusb.edu/etd/614.

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The Vaquita marino (Phocoena sinus) is the smallest, most recently discovered, most limited in its distribution, and most highly endangered of all the Cetaceans. Two risk factors have been identified in the Vaquita’s conservation; mortalities due to bycatch in the artisanal fishing fleet in the Upper Gulf of California, and environmental disturbance. The habitat disturbance risk factor is a direct result of the desiccation of the Colorado River Delta because of extensive water diversions form the Colorado River by the dam system within the United States. Significant disagreements exist as to t

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26

Pereira, Zara Valquiria Pimenta Aguiar e. Cardoso. "Ecologia alimentar do bôto (Phocoena phocoena) ao longo da costa continental portuguesa." Dissertação, 2013. https://repositorio-aberto.up.pt/handle/10216/70768.

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Pereira, Zara Valquiria Pimenta Aguiar e. Cardoso. "Ecologia alimentar do bôto (Phocoena phocoena) ao longo da costa continental portuguesa." Master's thesis, 2013. https://repositorio-aberto.up.pt/handle/10216/70768.

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28

Prahl, Susanne [Verfasser]. "Untersuchungen zum Bau der epicranialen Atemwege beim Schweinswal (Phocoena phocoena Linnaeus, 1758) / vorgelegt von Susanne Prahl." 2007. http://d-nb.info/986396338/34.

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29

Hall, Anna Marie. "Seasonal abundance, distribution and prey species of harbour porpoise (Phocoena phocoena) in southern Vancouver Island waters." Thesis, 2004. http://hdl.handle.net/2429/15204.

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Harbour porpoise (Phocoena phocoena) occur year round in the waters of southern British Columbia, but little is known about their seasonal abundance, habitat use and food habits. A systematic vessel-based line transect survey was undertaken to quantitatively assess seasonal trends in harbour porpoise abundance and distribution within the Canadian waters of Juan de Fuca and Haro Straits (08 September 2001 to 31 August 2002). These data were supplemented with opportunistic counts (1995-1996, 1998-2001) and stomach contents from post-mortem stranded porpoise (1998-2001). The study area enc

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30

Herr, Helena [Verfasser]. "Vorkommen von Schweinswalen (Phocoena phocoena) in Nord- und Ostsee - im Konflikt mit Schifffahrt und Fischerei? / vorgelegt von Helena Herr." 2009. http://d-nb.info/995004455/34.

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31

Vallina, Ángela Llavona. "Population parameters and genetic structure of the harbour porpoise (Phocoena Phocoena, L. 1758) in the Northwest the Iberian Peninsula." Doctoral thesis, 2018. http://hdl.handle.net/10773/24058.

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The main aim of this thesis was to provide information about harbour porpoises (Phocoena phocoena) in the North Western Iberian peninsula (NWIP), as they are designated as ”vulnerable” in Spain (Catálogo Nacional de Especies Amenazadas, Law 4/1989, 2000; Livro vermelho dos vertebrados de Portugal) and are included in Annex-II of the EU Habitats Directive, thus requiring the designation of Special Area of Conservation (SAC) by EU Member States in areas of critical habitat. The study of their populations is a priority issue and both IWC (International Whaling Commission) and ICES (International

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32

Hood, Catherine Catania. "Incidental capture of harbour porpoise, Phocoena phocoena, in three gillnet fisheries of the northwest Atlantic : an investigation of possible factors /." 2001.

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33

Ângelo, Ana Rita Melo. "Arrojamentos de cetáceos e interações com as pescas na costa norte de Portugal Continental." Master's thesis, 2021. http://hdl.handle.net/10773/30825.

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A análise de arrojamentos de cetáceos tornou-se uma ferramenta importante para o estudo e monitorização de populações. Os arrojamentos representam informação que contribui para conhecermos melhor a ocorrência, distribuição e densidade relativa de uma espécie, condição corporal, saúde e causas de morte prevalentes. Desta maneira, este estudo serviu para verificar a situação atual, e dos últimos 10 anos, dos arrojamentos de cetáceos, em especial do golfinho-comum e boto, na zona centro e norte de Portugal, desde Caminha até Peniche. Para isso, recorreu-se aos dados da rede regional d

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34

Oliveira, Ana Filipa de. "Caracterização do estado reprodutor de fêmeas de pequenos cetáceos na costa norte de Portugal." Master's thesis, 2021. http://hdl.handle.net/10773/30668.

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As populações de pequenos cetáceos estão sujeitas a várias ameaças, principalmente antropogénicas, que têm vindo a provocar o declínio de algumas populações. É, portanto, fundamental conhecer a história de vida e a dinâmica populacional de pequenos cetáceos para fundamentar a aplicação de medidas e estratégias de conservação e mitigação eficazes contra o declínio das populações. Além disso, dados de estudos anteriores têm demonstrado que muitos dos indivíduos encontrados arrojados são ainda juvenis, indicando que parte dos efetivos não atinge a idade reprodutora, tendo consequências gra

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Stalder, Dominique Sabina. "Influence of environmental drivers on the movement behaviour of harbour porpoises in the North Sea." Master's thesis, 2019. http://hdl.handle.net/10400.3/5137.

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Dissertação de Mestrado, Estudos Integrados dos Oceanos, 18 abril de 2019, Universidade dos Açores.<br>O boto e um pequeno predador marinho com um elevado estatuto de conservação nas águas europeias. Para uma proteção eficaz desta espécie é importante ter conhecimentos detalhados das respostas comportamentais as mudanças das condições ambientais. Neste estudo, investiguei a influência das condições ambientais sobre a variação do comportamento de deslocação de grande escala da população de botos no Mar do Norte. Foram analisados dados de deslocações de 57 indivíduos rastreados por satélite num

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36

Lucas, Ana Isabel Vaz. "Variability of harbour porpoise diet with a particular focus on the consumption of whiting and Atlantic herring, in Scottish waters (1992-2014)." Master's thesis, 2018. http://hdl.handle.net/10400.1/12517.

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Harbour porpoise (Phocoena phocoena) is one of the most abundant cetaceans in Scotland, where it forages for prey such as whiting, sandeel and sepiolids. Currently, whiting is among primary prey, while herring, an important prey historically for porpoises, seemed not to be common in their diet anymore. The present work aimed to study spatial and temporal variability in porpoise diet, and the effects of prey availability and porpoises physical characteristics on the consumption of herring and whiting. Besides presenting new information, this study helps extend the data on porpoise diet beyond a

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