Relevant bibliographies by topics / Heaviside's dolphin (Cephalorhynchus heavisidii)

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Academic literature on the topic 'Heaviside's dolphin (Cephalorhynchus heavisidii)'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Heaviside's dolphin (Cephalorhynchus heavisidii)"

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Jansen van Vuuren, B., P. B. Best, J. P. Roux, and T. J. Robinson. "Phylogeographic population structure in the Heaviside's dolphin (Cephalorhynchus heavisidii): conservation implications." Animal Conservation 5, no. 4 (November 2002): 303–7. http://dx.doi.org/10.1017/s1367943002004055.

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Martin, Morgan J., Tess Gridley, Simon H. Elwen, and Frants H. Jensen. "Heaviside's dolphins ( Cephalorhynchus heavisidii ) relax acoustic crypsis to increase communication range." Proceedings of the Royal Society B: Biological Sciences 285, no. 1883 (July 18, 2018): 20181178. http://dx.doi.org/10.1098/rspb.2018.1178.

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The costs of predation may exert significant pressure on the mode of communication used by an animal, and many species balance the benefits of communication (e.g. mate attraction) against the potential risk of predation. Four groups of toothed whales have independently evolved narrowband high-frequency (NBHF) echolocation signals. These signals help NBHF species avoid predation through acoustic crypsis by echolocating and communicating at frequencies inaudible to predators such as mammal-eating killer whales. Heaviside's dolphins ( Cephalorhynchus heavisidii ) are thought to exclusively produce NBHF echolocation clicks with a centroid frequency around 125 kHz and little to no energy below 100 kHz. To test this, we recorded wild Heaviside's dolphins in a sheltered bay in Namibia. We demonstrate that Heaviside's dolphins produce a second type of click with lower frequency and broader bandwidth in a frequency range that is audible to killer whales. These clicks are used in burst-pulses and occasional click series but not foraging buzzes. We evaluate three different hypotheses and conclude that the most likely benefit of these clicks is to decrease transmission directivity and increase conspecific communication range. The expected increase in active space depends on background noise but ranges from 2.5 (Wenz Sea State 6) to 5 times (Wenz Sea State 1) the active space of NBHF signals. This dual click strategy therefore allows these social dolphins to maintain acoustic crypsis during navigation and foraging, and to selectively relax their crypsis to facilitate communication with conspecifics.
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Martin, Morgan J., Simon H. Elwen, Reshma Kassanjee, and Tess Gridley. "To buzz or burst-pulse? The functional role of Heaviside's dolphin, Cephalorhynchus heavisidii, rapidly pulsed signals." Animal Behaviour 150 (April 2019): 273–84. http://dx.doi.org/10.1016/j.anbehav.2019.01.007.

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Caputo, M., S. Elwen, T. Gridley, SA Kohler, JP Roux, PW Froneman, and JJ Kiszka. "Dietary plasticity of two coastal dolphin species in the Benguela upwelling ecosystem." Marine Ecology Progress Series 669 (July 8, 2021): 227–40. http://dx.doi.org/10.3354/meps13755.

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Defining the trophic relationships of marine predators and their dietary preferences is essential in understanding their role and importance in ecosystems. Here we used stable isotope analysis of skin samples (δ15N values reflecting trophic level and δ13C values reflecting foraging habitat) to investigate resource partitioning and spatial differences of the feeding ecology of dusky dolphins Lagenorhynchus obscurus and Heaviside’s dolphins Cephalorhynchus heavisidii from 2 coastal study sites separated by 400 km along the coast of central (Walvis Bay) and southern (Lüderitz) Namibia in the Benguela upwelling ecosystem. Overall, isotopic niches of both predators were significantly different, indicating partitioning of resources and foraging habitats. Despite their smaller body size, Heaviside’s dolphins fed at a significantly higher trophic level than dusky dolphins. Stable isotope mixing models revealed that both species fed on high trophic level prey (i.e. large Merluccius spp., large Sufflogobius bibarbatus, and Trachurus t. capensis) at Walvis Bay. The diet of both dolphin species included smaller pelagic fish and squid at Lüderitz. Spatial differences highlight that Heaviside’s and dusky dolphins may exhibit dietary plasticity driven by prey availability, and that they likely form distinct population segments. Important prey for both dolphin species, specifically Merluccius spp. and T. t. capensis, are the main target of trawl fisheries in the Benguela upwelling ecosystem, highlighting potential resource overlap between dolphins and fisheries.
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Elwen, Simon H., and Ruth H. Leeney. "Injury and Subsequent Healing of a Propeller Strike Injury to a Heaviside's Dolphin (Cephalorhynchus heavisidii)." Aquatic Mammals 36, no. 4 (December 1, 2010): 382–87. http://dx.doi.org/10.1578/am.36.4.2010.382.

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GOPAL, Keshni, Leszek KARCZMARSKI, and Krystal A. TOLLEY. "Patterns of geographic variation between mitochondrial and nuclear markers in Heaviside's (Benguela) dolphins ( Cephalorhynchus heavisidii )." Integrative Zoology 14, no. 5 (September 2019): 506–26. http://dx.doi.org/10.1111/1749-4877.12380.

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Elwen, Simon, Michael A. Meÿer, Peter B. Best, P. G. H. Kotze, Meredith Thornton, and Stephan Swanson. "RANGE AND MOVEMENTS OF FEMALE HEAVISIDE'S DOLPHINS (CEPHALORHYNCHUS HEAVISIDII), AS DETERMINED BY SATELLITE-LINKED TELEMETRY." Journal of Mammalogy 87, no. 5 (October 2006): 866–77. http://dx.doi.org/10.1644/05-mamm-a-307r2.1.

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Elwen, Simon H., Desray Reeb, Meredith Thornton, and Peter B. Best. "A population estimate of Heaviside's dolphins,Cephalorhynchus heavisidii, at the southern end of their range." Marine Mammal Science 25, no. 1 (January 2009): 107–24. http://dx.doi.org/10.1111/j.1748-7692.2008.00246.x.

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9

Elwen, Simon H., Peter B. Best, Desray Reeb, and Meredith Thornton. "Diurnal Movements and Behaviour of Heaviside's Dolphins,Cephalorhynchus heavisidii, with some Comparative Data for Dusky Dolphins,Lagenothynchus obscutus." South African Journal of Wildlife Research 39, no. 2 (October 2009): 143–54. http://dx.doi.org/10.3957/056.039.0204.

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10

Elwen, S. H., M. Thornton, D. Reeb, and P. B. Best. "Near-Shore Distribution of Heaviside's (Cephalorhynchus heavisidii) and Dusky Dolphins (Lagenorhynchus obscurus) at the Southern Limit of their Range in South Africa." African Zoology 45, no. 1 (April 2010): 78–91. http://dx.doi.org/10.3377/004.045.0103.

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Dissertations / Theses on the topic "Heaviside's dolphin (Cephalorhynchus heavisidii)"

1

Behrmann, Caryn Ann. "Occurrence and group dynamics of Heaviside’s dolphins (Cephalorhynchus heavisidii) in Table Bay, Western Cape, South Africa." Diss., University of Pretoria, 2011. http://hdl.handle.net/2263/30835.

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Heaviside‟s dolphins, Cephalorhynchus heavisidii, are among the least known cetaceans. They are endemic to the coastal waters along the west coast of southern Africa. The occurrence, behaviour and group dynamics were investigated for these dolphins in Table Bay, South Africa during the summer of 2008 and 2009. Markrecapture photographic identification techniques, modelling techniques and Geographical Information System (GIS) were used to analyse the data. The dolphins were observed primarily in a well-defined 7 km2 area on the south side of Table Bay along a 3 km east-west stretch of coast known as Granger Bay, and within 2 km from shore. They used this area heterogeneously; for the array of behaviours observed, all core areas (50 % kernels) were located in Granger Bay with very little overlap of areas used for milling, socialising, resting and travelling. Milling and socialising were exhibited more often than travelling and resting. Foraging was never observed in areas close to shore, which supports earlier studies suggesting that these dolphins forage primarily offshore. Of the 95 identified individuals, 24.2 % of the individuals were seen only once and 73.7 % of the individuals were sighted less than five times while two individuals were seen 11 times. Groups varied in size from one to 26 animals with a median of five animals. Many of the potential dyads were never seen and those observed had generally weak measure of association. The group structure appears highly dynamic, with great lability in group sizes and membership, suggesting a fluid social system with mostly weak inter-individual bonds. Individuals in Table Bay display low site fidelity, at least in the short-term. The observed pattern of area use and behavioural preferences indicate that coastal management strategies should consider the ecological and behavioural needs of Heaviside's dolphins to appropriately safeguard this species as a valuable component of South African natural treasures and legally protected taxa. Further continuing research is needed to build on this initial study to better understand the processes that shape the population structure and group dynamics of Heaviside's dolphins, and to provide further detail on habitat preferences and areas used, both in Table Bay and environs.
Dissertation (MSc)--University of Pretoria, 2011.
Zoology and Entomology
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2

Elwen, Simon Harvey. "The distribution, movements and abundance of Heaviside's dolphins in the nearshore waters of the Western Cape, South Africa." Thesis, Pretoria : [s.n.], 2008. http://upetd.up.ac.za/thesis/available/etd-01062009-151103/.

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Serot, Julie Lynn. "Heavy metal analysis in Heaviside's dolphins (Cephalorhyncus heavisidii)." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/193469.

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Skin and blubber tissue samples were collected from two hundred and six freeranging Heaviside’s dolphins (Cephalorhyncus heavisidii) during January through June of 2008, 2009, and 2010, along the coast of South Western Africa, to be analyzed for heavy metal concentration levels. Inductively coupled mass spectrometry (ICP-MS) was used to determine sample solution concentrations of all metals (aluminum, arsenic, cadmium, chromium, copper, iron, lead, manganese, mercury, nickel, selenium and zinc). Data provided by this thesis is the first reference of its kind for this species (Cephalorhyncus heavisidii), which is one of the least-known cetacean species in the world. In addition to baseline heavy metal concentration information for the Heaviside’s dolphin, meaningful population structural and ecological information was obtained. A level of site fidelity or specific movement pattern across certain sites was indicated by the presence of different concentration levels across individuals sampled in different areas, especially adjacent areas. With an investigation into the potential sources of the marine heavy metal contamination, it was deduced that these sources contributed to each site’s unique and characteristic toxicological and hydrological profile as reflected by the bioaccumulation patterns seen in this study. It was confirmed by this study that bioaccumulation levels are a meaningful and novel measure of population structure. Potential evidence of differences in bioaccumulation patterns between sexes was observed in this study, as well. Although not definitive, a difference in metabolism, heavy metal elimination, or ranging pattern between males and females was suggested by the results. Variation in the results suggests a deepened level of complexity in the physiological and ecological aspects of trace elements accumulation and detoxification in the tissue of an apex predator like the Heaviside’s dolphin. Finally, a general assessment of health implications for the species was established, and it was found that Heaviside’s dolphins have higher than average mammalian trace element concentrations, and higher than average concentrations as specifically compared with other odontocetes. Further research using a larger sample size and using internal organs will provide more insight and a deeper understanding of the novel information presented here.
published_or_final_version
Biological Sciences
Master
Master of Philosophy
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4

Gopal, Keshni. "A Genetic Study Of Two Inshore Dolphin Species (Cephalorhynchus Heavisidii And Tursiops Aduncus) Found Along The Coast Of South Africa." Thesis, University of Pretoria, 2013. http://hdl.handle.net/2263/79240.

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Genetic parameters such as genetic variability, gene flow, relatedness and migration were determined between two South African coastal delphinid species, Cephalorhynchus heavisidii (Heaviside’s dolphin) and Tursiops aduncus (Indo-Pacific Bottlenose dolphin), in order to contribute towards designing efficient conservation management strategies. The molecular markers used in this study include the mitochondrial DNA control region (mtDNA) and several microsatellite loci that were chosen from existing dolphin primer sets which also proved to crossamplify on additional cetacean species. The population structure and gene flow investigated for Heaviside’s dolphins across seven sampling sites (n = 395) revealed contrasting results. Mitochondrial DNA suggested six populations within the range studied (ФST = 0.15611, P < 0.0001), whilst microsatellite data identified only two populations and differed with respect to the relative levels of specific pairwise population differentiation comparisons. Neutrality tests of the mitochondrial sequences combined to the mismatch distribution analysis, pointed towards a population expansion at the two geographic extremes (Table Bay and Walvis Bay), whereas bottleneck tests suggest a bottleneck in the northern population (Lamberts Bay, Hondeklipbaai, Port Nolloth, Luderitz, and Walvis Bay). Genetic relatedness and population connectivity of the two known populations and amongst sampling localities confirmed that connectivity and relatedness exist among the sampling sites, and that the northern and southern meta-populations are less well connected. Table Bay area was revealed unique because of its high relatedness. The sampling sites are different from each other in terms of population connectivity and relatedness, suggesting spatial partitioning in relation to environmental and social factors within the population, with some level of connectivity displayed in certain localities. The establishment of shark nets along the KwaZulu-Natal coastline that protects beach goers has had a long-term detrimental effect on the bottlenose dolphin (Tursiops aduncus) populations that inhabit the area since they are incidentally caught in these nets. A comparative study was done by comparing recently collected data (2007 - 2011) to previous sampling (1994 - 2000; Natoli et al. 2008) using mitochondrial DNA control region sequences (583 bp) and fourteen nuclear microsatellite data. The mtDNA sequences suggest that the coastal/migratory population has undergone a relatively recent demographic change shown by the FST value (ФST = 0.1138, P < 0.0180) in conjunction with the strong expansion signal shown by the mismatch distribution. It is suggested that the two populations be managed independently with a strong focus on conserving the coastal resident population North of Ifafa. Population Viability Analysis revealed that the coastal resident population of T. aduncus would be more affected than the migratory population by the number of individuals being caught in the shark nets. With respect to C. heavisidii, sensitivity analysis revealed that as little as 15 individuals removed from a small population size (n = 10 000) will produce a trend that may affect the overall population size of this species. This study exemplifies the importance of gathering long term life history data, inclusive of the threats faced by both species, in order to implement the correct conservation measures for continual monitoring to take place and ensure the survivorship of both species.
Thesis (PhD)--University of Pretoria, 2013.
Zoology and Entomology
PhD
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