Red List of South African Species

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Data Deficient (DD)
Assessors: Claire Relton Vic Cockcroft Greg Hofmeyr
Contributors: Simon Elwen Ken Findlay Michael Meÿer Herman Oosthuizen Stephanie Plön Matthew Child
Reviewers: Claire Relton Vic Cockcroft Greg Hofmeyr

Rationale

There is no information pertaining to the population abundance of beaked whales within the assessment region, and they are generally considered to be naturally rare. However, there appear to be no current major threats to these species, although marine noise pollution, usually in the form of seismic surveys, navy operations and marine construction, as well as plastic pollution, have been identified as emerging and escalating threats to beaked whales. Anecdotal evidence suggests that beaked whales are more vulnerable to marine noise (particularly mid-frequency active sonar) than other cetaceans. The compounding influences of these threats, in association with other low-level threats, such as anthropogenic climate change, could potentially cause beaked whale population declines. With the exception of the Southern Bottlenose Whale, beaked whales in the assessment region are listed as Data Deficient, which highlights the need for additional research, specifically on assessments of abundance, changes in abundance, distribution and anthropogenic threats, including marine noise pollution. In other parts of the world there have been repeated instances of mass strandings of Cuvier’s Beaked Whales associated with mid to low frequency active sonar. It has been suggested that these sonar effects could extend to seismic surveys (applicable to all beaked whale species). Within the assessment region, only 26 strandings have been recorded. Thus, although this species is presumably common and abundant in South African waters, we list as Data Deficient until abundance and the effects of marine noise pollution can be investigated. Reassessments should follow when new data are available. The Southern Bottlenose Whale is the most abundant of all Ziphiidae species within South African waters, and is the second most commonly sighted whale. Data from the IWC circumpolar surveys places the national population at between 50,000 and 70,000 individuals with an estimated stable population trend and no major threat that could cause population decline. Although, similarly for the other beaked whales, marine noise pollution is considered a major emerging and intensifying threat, it is not projected to cause significant population decline of this abundant species. Thus, we list this species as Least Concern.

Regional population effects: Beaked whales are considered to be wide-ranging, seasonally migrating species. Those present within South African waters in summer presumably spend winters in the southern oceans, thus there are no barriers to dispersal, and rescue effects are possible.

Distribution

Mesoplodon grayi has a circumpolar distribution within the cold temperate waters of the south Pacific, Indian and Atlantic Oceans (Mead 1989; Macleod et al. 2006) (Figure 2). This species is predominantly restricted to the region between 30°S and 53°S (Ross 1984), with the exception of the cold Benguela Current, where its range extends northwards beyond these latitudes (Findlay et al. 1992). There is a solitary extralimital stranding record of this species in the northern hemisphere, in the Netherlands (Boschema 1950). Along with stranding records from New Zealand, Argentina, Chile, Peru and southern Australia, specimens of this species have been confirmed from along the South African and Namibian coasts (Meester et al. 1986; Best 2007). Due to the seasonal trend associated with strandings data, this species is expected to exhibit definite migrations from wintering grounds in Antarctic waters, northwards to lower latitudes in summer (Ross 1984).

Population trend

Trend

Mesoplodon densirostris is the most common species of its genus, and is considered fairly common within tropical waters (Reeves et al. 2003), however, no abundance estimates are available for this species within the assessment region. Similarly, there is also very little information pertaining to the population abundances and trends of M. grayi, M. hectori and M. layardii as they are rarely sighted at sea. Both M. grayi and M. hectori are, however, considered fairly common in New Zealand waters, but uncommon elsewhere in the southern hemisphere.

Threats

There appear to be no widely distributed major threats to beaked whales. The impact of potential threats are unknown but, considering that most Ziphiidae species are naturally rare, especially within the assessment region, they may have unsustainable impacts on local populations and further research is required. Potential threats are discussed below:

Anthropogenic noise pollution has become an increasing and well-known threat to beaked whales, as they appear to be more vulnerable to noise pollution than other cetacean species (Dalebout et al. 2005). A number of mass stranding events involving beaked whales have been attributed to seismic exploration and high-powered navy sonar (Simmonds & Lopez-Jurado 1991; Mignucci-Giannoni 1996; Frantzis 1998, 2004; Balcomb & Claridge 2001; Jepson et al. 2003; Cox et al. 2006). Although the exact mechanistic causes are not clearly understood, the formation of gas bubbles (Fernández et al. 2005), appears to be attributed to sonar activities and noise pollution (Cox et al. 2006). Jepson et al. (2003) described the physiological damage, including acute and chronic tissue damage, inflicted on beaked whales by the deployment of military sonar at the Canary Islands. Although other beaked whale species were impacted, Cuvier’s Beaked Whale was affected most severely. Due to the evidence of “bubble-like lesions”, the live stranding of a mother and calf I. pacificus in Taiwan may have been attributed to unidentified anthropogenic noise activities (Yang et al. 2008). Mass strandings of Cuvier’s Beaked Whales attributed to the use of active sonar by navy vessels has been documented on a number of occasions during the late 1990s and early 2000s in the Mediterranean (Frantzis 1998), the Bahamas (Balcomb & Claridge 2001), and Japan (Brownell et al. 2004). Additionally, a seismic survey is thought to be responsible for the stranding of two individuals in the Gulf of California (Malakoff 2002). It is believed that loud sounds may cause animals to panic and surface rapidly, thus resulting in rapid decompression; alternatively, the mid-frequency sonar activity may cause vibrations that form air bubbles in the individual’s tissues (Jepson et al. 2003). In 2004 a moratorium on naval activities in the Canary Islands was enforced by the Spanish government, and since then no mass stranding events have occurred in this area (Fernández et al. 2013). Within the assessment region, marine noise pollution is intensifying due to coastal industrial development, shipping traffic and energy exploration, and thus represents a potentially severe threat.

Plastic pollution is a large-scale and increasing problem in all marine environments. The ingestion of plastic marine pollution has been documented in several species of beaked whales, and may eventually lead to mortality as a result of choking, a reduction in appetite or starvation (e.g. Scott et al. 2001). A dead adult Blainville’s Beaked Whale found on a beach in southern Brazil in 1993 was found to contain a bundle of blue plastic threads within its primary stomach chamber (Secchi & Zarzur 1999). Based on the lack of food and parasites within its stomach and gut, it is likely that this individual had not fed for some time. Stranded True’s Beaked Whales have also been found to have consumed plastic pollution

Accidental entanglement of beaked whales in fisheries is widespread, particularly in deep-water gillnets, although the number of recorded mortalities is not high. However, Southern Bottlenose Whales have been caught as bycatch in driftnet fisheries in the Tasmanian Sea (Jefferson et al. 1993). Extensive gillnet and longline fishing practises throughout the ranges of many beaked whales may become an increasing risk to these species as a result of accidental entrapment and drowning. Deep water gillnets, especially those for billfish and tuna, are probably the most substantial threat to True’s Beaked Whale. Julian & Beeson (1998) documented the annual mortality of Cuvier’s Beaked Whales as between 22 and 44 individuals accidentally caught in drift gillnets off California.

The expansion of high-latitude fisheries, such as those directed at Antarctic Toothfish (Dissostichus mawsoni), which are largely unregulated and illegal, threaten the food stocks available for large cetaceans such as beaked whales. There is substantial evidence of large-scale reductions in many predatory fish populations (Baum et al. 2003, 2005; Polacheck 2006; Sibert et al. 2006), over-fishing and the collapse of several important “prey” fish stocks world-wide (e.g. Jackson et al. 2001). Although the effects of anthropogenic fish exploitation and the subsequent ecosystem changes on beaked whales is considered to be fairly low in comparison to other cetaceans in the Pacific Ocean (Trites et al. 1997), the degree of impact associated with high-latitude fisheries world-wide is largely unknown and could result in population declines.

The marine-related threats associated with global climate change may pose unquantified and complex threats to beaked whales, particularly within cool temperate and cold Antarctic habitats (Learmonth et al. 2006). Increasing ocean temperatures may result in range shift or contraction (Learmonth et al. 2006); however, no direct predictions pertaining to the direction or size of these shifts in range are currently known. 

Unlike many whale species, beaked whales have not experienced large-scale historic or recent exploitation for meat or other products. This may be attributed to their general scarcity and inconspicuous nature, deep-sea distributions and/or deep-diving behaviour. Small-scale opportunistic takes from Sri Lanka of a species identified as “Bottlenose Whales” are probably I. pacificus (Dayaratne & Joseph 1993). Additionally, Cuvier’s Beaked Whales have been caught opportunistically by Japanese whaling operations directed at Berardius species, as well as in the Caribbean, Indonesia, Taiwan and South America as bycatch in other direct fisheries (Heyning 1989; Jefferson et al. 1993). Between 3 and 35 Z. cavirostris individuals are reported to have been caught annually in Japan during the 1950s (Omura et al. 1955); however, no direct takes of this species were reported two decades later (Nishiwaki & Oguro 1972).

Uses and trade

In general, beaked whales in the southern hemisphere are not utilised or traded commercially, although some small-scale subsistence utilisation of Blainville’s Beaked Whale by artisanal fisheries has been recorded. Additionally, a limited number of B. arnuxii and H. planifrons specimens have been taken for the purpose of scientific research (Jefferson et al. 1993). Historically, Z. cavirostris was hunted opportunistically off the coast of Japan during hunts specifically aimed at Baird’s Beaked Whales (Berardius bairdii) (Omura et al. 1955; Nishiwaki & Oguro 1972). Although commercial hunting of Cuvier’s Beaked Whales has ceased, products pertaining to this species are still for sale in certain Asian markets, suggesting that this species is either susceptible to accidental bycatch, or may be subject to unreported direct exploitation. Small-scale hunting of this species has also occurred in other regions, but there are no records of this within the assessment region.

Conservation

More research into the distribution, abundance, migration patterns, bycatch rate and diet of beaked whales is essential for the effective development of species-specific mitigation measures for these species in South African waters. Mitigation measures associated with anthropogenic marine noise is probably most vital for Ziphiidae species locally and world-wide. The Parties to the UNEP Convention on the Conservation of Migratory Species of Wild Animals (CMS) Agreement on the Conservation of Cetaceans in the Black Sea, Mediterranean Sea and Contiguous Atlantic Area (ACCOBAMS) suggested in 2004 that anthropogenic activities that produce high-intensity marine noise pollution should be avoided in areas of high Cuvier’s Beaked Whale concentration. Due to their cryptic nature, mitigation of noise pollution based on observation is likely to be ineffective for these species. Additionally, avoidance of beaked whale habitats in South African waters is currently challenging due to their wide distribution, and the lack of data pertaining to habitat preferences and geographical extent across this region.

Passive acoustic monitoring is a valuable technique used to detect marine mammals in order to modify marine activities so as to avoid the animals, decrease the amplitude or temporarily stop the source of sound when animals are within a critical distance (Barlow & Gisiner 2006). Although beaked whales are acoustically difficult to detect, all species are assumed to give off echolocation clicks, some may also produce whistles (Dawson et al. 1998; MacLeod & D’Amico 2006). However, Cuvier’s and Blainville’s Beaked Whales have been found to only produce echolocation clicks when they are several hundred metres deep. Generally, the clicks of Ziphiidae species are more narrow-banded than those of other marine mammals of a similar frequency, thus electronic filtering methods may be more effective than other methods (Barlow & Gisiner 2006).

Maintaining sightings records of beaked whales, during ship-based surveys directed at other species, is a valuable means with which to monitor the distribution and abundance of these cryptic and unknown species in South African waters.

All Ziphiidae species within the assessment region are listed either on Appendix I or II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES).

Recommendations for managers and practitioners:
  • Critical beaked whale habitats, and areas of high beaked whale concentration should be identified, so as to effectively mitigate the effects of noise pollution.
  • Although species-specific monitoring is deemed unnecessary for Ziphiidae species in the assessment region, sightings data should be recorded during systematic monitoring of other cetacean species.
  • Establish a nationwide strandings network and databases (comprised of whale-watching operators, coastal protected areas, police stations, hotels, etc.) to gather and pool information.
Research priorities:
  • Population size and trend estimates.
  • Effects of marine noise pollution and plastic pollution on beaked whale populations.
  • The identification of high concentration areas in South African waters, including distributional limits, seasonal movements and diving behaviour.
  • Diet, reproduction and general biology.
Encouraged citizen actions:
  • Report strandings east of Mossel Bay to the Port Elizabeth Museum, and west of Mossel Bay to Iziko Museums, Cape Town.
  • Report sightings on virtual museum platforms (for example, iSpot and MammalMAP) to help with mapping geographical distribution.
  • Avoid using plastic bags.
  • Save electricity and fuel to mitigate CO2 emissions and hence the rate of climate change.

References 

[@book{1087,
 address = {Pretoria, South Africa},
 author = {Meester, J.A.J., Rautenbach, I.L., Dippenaar, N.J. and Baker, C.M.},
 publisher = {Transvaal Museum },
 title = {Classification of Southern African Mammals. Monograph number 5.},
 year = {1986}
}
,@article{2058,
 author = {Learmonth, J.A., Macleod, C.D., Santos, M.B., Pierce, G.J., Crick, H.Q.P. and Robinson, R.A.},
 journal = {Oceanography and Marine Biology: An Annual Review},
 pages = {431--464},
 title = {Potential effects of climate change on marine mammals},
 volume = {44},
 year = {2006}
}
,@book{2062,
 address = {Lawrence, Kansas},
 author = {Rice, D.W.},
 publisher = {Society for Marine Mammalogy, Special Publication Number 4},
 title = {Marine Mammals of the World: Systematics and Distribution},
 year = {1998}
}
,@article{2474,
 author = {Kasamatsu, F., Hembree, D., Joyce, G., Tsunoda, L., Rowlett, R. and Nakano, T.},
 title = {Distribution of cetacean sightings in the Antarctic: results obtained from the IWC/IDCR minke whale assessment cruises, 1978/79 to 1983/84.},
 year = {1988}
}
,@article{2474,
 author = {Moore SE.},
 journal = {Journal of Mammalogy},
 pages = {534--540},
 title = {Marine mammals as ecosystem sentinels},
 volume = {89},
 year = {2008}
}
,@inbook{2474,
 address = {San Diego, California, USA.},
 author = {Perrin  and Thewissen },
 booktitle = {Minke Whales <i>Balaenoptera acutorostrata</i> and <i>B. bonaerensis</i>},
 editor = {Perrin, W.F. and Brownell, R.L},
 pages = {750–754},
 publisher = {Academic Press},
 title = {Encyclopedia of Marine Mammals},
 year = {2002}
}
,@electronic{2474,
 address = {www.marinemammalscience.org},
 author = {Committee on Taxonomy},
 publisher = {Society for Marine Mammalogy},
 title = {List of marine mammal species and subspecies},
 year = {2017}
}
,@book{2476,
 address = {Cape Town, South Africa},
 author = {Best, P.B.},
 publisher = {Cambridge University Press},
 title = {Whales and Dolphins of the Southern African Subregion},
 year = {2007}
}
,@techreport{2476,
 author = {Koper RP, Plön S},
 institution = {Endangered Wildlife Trust, South Africa},
 title = {The potential impacts of anthropogenic noise on marine animals and recommendations for research in South Africa},
 year = {2012}
}
,@article{2762,
 author = {Baum, J.K., Kehler, D. and Myers, R.A.},
 title = {Robust estimates of decline for pelagic shark populations in the northwest Atlantic and Gulf of Mexico},
 year = {2005}
}
,@article{2762,
 author = {Pitman, R.L.},
 title = {Indo-Pacific Beaked Whale <i>Indopacetus pacificus</i>.},
 year = {2002}
}
,@techreport{2762,
 address = {Gland, Switzerland and Cambridge, UK},
 author = {Reeves, R.R., Smith, B.D., Crespo, E.A. and Notarbartolo di Sciara, G.},
 institution = {IUCN},
 title = {Dolphins, Whales and Porpoises: 2002-2010 Conservation Action Plan for the World's Cetaceans},
 year = {2003}
}
,@inbook{2762,
 author = {},
 booktitle = {Baird's beaked whale <i>Berardius bairdii</i> Stejneger, 1883: Arnoux's beaked whale <i>Berardius arnuxii</i> Duvernoy, 1851},
 editor = {Balcomb, K. C.},
 pages = {261--288},
 publisher = {Academic Press},
 title = {Handbook of marine mammals, Vol. 4: River dolphins and the larger toothed whales},
 year = {1989}
}
,@article{2762,
 author = {Jepson, P.D., Arebelo, M., Deaville, R., Patterson, I.A.P., Castro, P., Baker, J.R., Degollada, E., Ross, H.M., Herraez, P., Pocknell, A.M., Rodriguez, F., Howie, F.E., Espinosa, A., Reid, R.J., Jaber, J.R., Martin, V., Cunningham, A.A. and Fernandez, A.},
 journal = {Nature},
 pages = {575--576},
 title = {Gas-bubble lesions in stranded cetaceans},
 volume = {425},
 year = {2003}
}
,@phdthesis{2762,
 author = {Dalebout, M. L.},
 school = {University of Auckland},
 title = {Species identity, genetic diversity, and molecular systematic relationships among the Ziphiidae (beaked whales)},
 year = {2002}
}
,@article{2762,
 author = {Malakoff, D.},
 journal = {Science},
 pages = {722--723},
 title = {Suit ties whale deaths to research cruise},
 volume = {298},
 year = {2002}
}
,@article{2762,
 author = {Balcomb, K.C. and Claridge, D.E.},
 journal = {Bahamas Journal of Science},
 number = {2},
 pages = {2--12},
 title = {A mass stranding of cetaceans caused by naval sonar in the Bahamas},
 volume = {8},
 year = {2001}
}
,@article{2762,
 author = {Cox, T. M., Ragen, T. J., Read, A. J., Vos, E., Baird, R. W., Balcomb, K., Barlow, J., Caldwell, J., Cranford, T., Crum, L., D'Amico, A., D'Spain, A., Fernández, J., Finneran, J., Gentry, R., Gerth, W., Gulland, F., Hildebrand, J., Houser, D., Hullar, T., Jepson, P. D., Ketten, D., Macleod, C. D., Miller, P., Moore, S., Mountain, D., Palka, D., Ponganis, P., Rommel, S., Rowles, T., Taylor, B., Tyack, P., Wartzok, D., Gisiner, R., Mead, J. and Benner, L.},
 journal = {Journal of Cetacean Research and Management},
 number = {3},
 pages = {177--187},
 title = {Understanding the impacts of anthropogenic sound on beaked whales},
 volume = {7},
 year = {2006}
}
,@article{2762,
 author = {Paterson, R. A. and Parker, A. E.},
 journal = {Memoirs of the Queensland Museum},
 pages = {301--306},
 title = {Aerial observations of large ziphiid whales, possibly <i>Berardius arnuxii</i>, off the southern coast of New South Wales},
 volume = {37},
 year = {1994}
}
,@book{2762,
 author = {Jefferson, T. A., Leatherwood, S. and Webber, M. A.},
 publisher = {United Nation Environment Programme and Food and Agricultural Organization of the UN},
 title = {Marine Mammals of the World: FAO Species Identification Guide},
 year = {1993}
}
,@techreport{2762,
 author = {Brownell Jr., R. L., Yamada, T., Mead, J. G. and van Helden, A.},
 institution = {International Whaling Commission},
 title = {Mass strandings of Cuvier's beaked whales in Japan: U.S. naval acoustic link?},
 year = {2006}
}
,@inbook{2762,
 address = {Netherlands},
 author = {},
 booktitle = {Trackline detection probability for long-diving whales},
 editor = {Barlow, J.},
 pages = {209--221},
 publisher = {Balkema Press},
 title = {Marine mammal survey and assessment methods},
 year = {1999}
}
,@article{2762,
 author = {Kasamatsu, F. and Joyce, G. G.},
 journal = {Antarctic Science},
 pages = {365--379},
 title = {Current status of odontocetes in the Antarctic},
 volume = {7},
 year = {1995}
}
,@article{2762,
 author = {Fernández, A., Edwards, J. F., Rodriguez, F., Espinosa, A., De Los Monteros, Herraez, P., Castro, P., Jaber, J. R., Martin, V. and Arebelo, M.},
 journal = {Veterinary Pathology},
 pages = {446--457},
 title = {"Gas and fat embolic syndrome" involving a mass stranding of beaked whales (family Ziphiidae) exposed to anthropogenic sonar signals},
 volume = {42},
 year = {2005}
}
,@article{2762,
 author = {Dalebout, M. L., Ross, G. J. B., Baker, C. S., Anderson, R. C., Best, P. B., Cockcroft, V. G., Hinsz, H. L., Peddemors, V. M. and Pitman, R. L.},
 journal = {Marine Mammal Science},
 number = {3},
 pages = {421--461},
 title = {Appearance, distribution and genetic distinctiveness of Longman's beaked whale, <i>Indopacetus pacificus</i>},
 volume = {19},
 year = {2003}
}
,@article{2762,
 author = {Pitman, R. L., Palacios, D. M., Brennan, P. L. R., Brennan, B. J., Balcomb III, K. C. and Miyashita, T.},
 journal = {Marine Mammal Science},
 number = {2},
 pages = {531--549},
 title = {Sightings and possible identity of a bottlenose whale in the tropical Indo-Pacific: <i>Indopacetus pacificus</i>},
 volume = {15},
 year = {1999}
}
,@article{2762,
 author = {Macleod, C. D., Perrin, W. F., Pitman, R. L., Barlow, J., Balance, L., D'amico, A., Gerrodette, T., Joyce, G., Mullin, K. D., Palka, D. L. and Waring, G. T.},
 journal = {Journal of Cetacean Research and Management},
 number = {3},
 pages = {271--286},
 title = {Known and inferred distributions of beaked whale species (Ziphiidae: Cetacea)},
 volume = {7},
 year = {2006}
}
,@article{2762,
 author = {Dalebout, M. L., Van Helden, A., Van Waerebeek, K. and Baker, C. S.},
 journal = {Molecular Ecology},
 pages = {687--694},
 title = {Molecular genetic identification of southern hermisphere beaked whales (Cetacea: Ziphiidae)},
 volume = {7},
 year = {1998}
}
,@article{2762,
 author = {Scott, M. D., Hohn, A. A., Westgate, A. J., Nicolas, J. R., Whitaker, B. R. and Campbell, W. B.},
 journal = {Journal of Cetacean Research and Management},
 number = {1},
 pages = {87--94},
 title = {A note on the release and tracking of a rehabilitated pygmy sperm whale (<i>Kogia breviceps</i>)},
 volume = {3},
 year = {2001}
}
,@article{2762,
 author = {Ferguson, M. C. and Barlow, J.},
 journal = {Southwest Fisheries Science Center Adminstrative Report},
 pages = {61 pp.},
 title = {Spatial distribution and density of cetaceans in the eastern Pacific Ocean based on summer/fall research vessel surveys in 1986-96},
 volume = {LJ-01-04},
 year = {2001}
}
,@article{2762,
 author = {Heyning, J. E. and Mead, J. G.},
 journal = {Natural History Museum of Los Angeles County, Contributions in Science},
 pages = {12},
 title = {Suction feeding in beaked whales: morphological and observational evidence},
 volume = {464},
 year = {1996}
}
,@article{2762,
 author = {Sekiguchi, K., Klages, N. T. W. and Best, P. B.},
 journal = {Journal of Zoology (London)},
 pages = {453--463},
 title = {The diet of strap-toothed whales (<i>Mesoplodon layardii</i>)},
 volume = {239},
 year = {1996}
}
,@article{2762,
 author = {Mead, J. G.},
 journal = {Journal of Mammalogy},
 pages = {430--432},
 title = {First records of <i>Mesoplodon hectori</i> (Ziphiidae) from the northern hemisphere and a description of the adult male},
 volume = {62},
 year = {1981}
}
,@article{2762,
 author = {Dalebout, M. L., Mead, J. G., Baker, C. S., Baker, A. N. and van Helden, A. L.},
 journal = {Marine Mammal Science},
 number = {3},
 pages = {577--608},
 title = {A new species of beaked whale <i>Mesoplodon perrini</i> sp. n. (Cetacea: Ziphiidae) discovered through phylogenetic analyses of mitochondrial DNA sequences},
 volume = {18},
 year = {2002}
}
,@techreport{2762,
 address = {Madras, India},
 author = {Dayaratne, P. and Joseph, L.},
 institution = {Bay of Bengal Programme},
 title = {A study on dolphin catches in Sri Lanka},
 year = {1993}
}
,@article{2762,
 author = {Barlow, J.},
 journal = {Marine Mammal Science},
 number = {2},
 pages = {446--464},
 title = {Cetacean abundance in Hawaiian waters estimated from a summer/fall survey in 2002},
 volume = {22},
 year = {2006}
}
,@article{2762,
 author = {Anderson, R. C., Clark, R., Madsen, P. T., Johnson, C., Kiszka, J. and Breysse, O.},
 journal = {Aquatic Mammals},
 number = {2},
 pages = {223--231},
 title = {Observations of Longman's beaked whale (<i>Indopacetus pacificus</i>) in the Western Indian Ocean},
 volume = {32},
 year = {2006}
}
,@article{2762,
 author = {Sibert, J., Hampton, J., Kleiber, P. and Maunder, M.},
 journal = {Science},
 pages = {1773--1776},
 title = {Biomass, size, and trophic status of top predators in the Pacific Ocean},
 volume = {314},
 year = {2006}
}
,@article{2762,
 author = {Julian, F. and Beeson, M.},
 journal = {Fishery Bulletin},
 pages = {271--284},
 title = {Estimates of marine mammal, turtle, and seabird mortality for two California gillnet fisheries: 1990-95},
 volume = {96},
 year = {1998}
}
,@article{2762,
 author = {Omura, H., Fujino, K. and Kimura, S.},
 journal = {Scientific Reports of the Whales Research Institute},
 pages = {89--132},
 title = {Beaked whale <i>Berardius bairdi</i> of Japan, with notes on <i>Ziphius cavirostris</i>},
 volume = {10},
 year = {1955}
}
,@inbook{2762,
 author = {},
 booktitle = {Cuvier's beaked whale <i>Ziphius cavirostris</i> G. Cuvier, 1823},
 editor = {Heyning, J.E.},
 pages = {289--308},
 publisher = {Academic Press},
 title = {Handbook of marine mammals},
 year = {1989}
}
,@article{2762,
 author = {Nishiwaki, M. and Oguro, N.},
 journal = {Scientific Reports of the Whales Research Institute},
 pages = {35--41},
 title = {Catch of Cuvier's beaked whales off Japan in recent years},
 volume = {24},
 year = {1972}
}
,@article{2762,
 author = {Jackson, J. B. C., Kirby, M. X., Berger, W. H., Bjorndal, K. A., Botsford, L. W., Bourque, B. J., Bradbury, R. H., Cooke, R., Erlandson, J., Estes, J. A., Hughes, T. P., Kidwell, S., Lange, C. B., Lenihan, H. S., Pandolfi, J. M., Peterson, C. H., Steneck, R. S., Tegner, M. J. and Warner, R. R.},
 journal = {Science},
 pages = {629--637},
 title = {Historical overfishing and the recent collapse of coastal ecosystems},
 volume = {293},
 year = {2001}
}
,@article{2762,
 author = {Polacheck, T.},
 journal = {Marine Policy},
 pages = {470--482},
 title = {Tuna longline catch rates in the Indian Ocean: did industrial fishing result in a 90% rapid decline in the abundance of large predatory species?},
 volume = {30},
 year = {2006}
}
,@article{2762,
 author = {Dalebout, M.L., Robertson, K.M., Frantzis, A., Engelhaupt, D., Mignucci-Giannoni, A.A., Rosario-Delestre, R.J. and Baker, C.S.},
 journal = {Molecular Ecology},
 pages = {3353--3371},
 title = {Worldwide structure of mtDNA diversity among Cuvier's beaked whales (<i>Ziphius cavirostris</i>): Implications for threatened populations},
 volume = {14},
 year = {2005}
}
,@article{2762,
 author = {Frantzis, A.},
 journal = {Nature},
 number = {5},
 pages = {29},
 title = {Does acoustic testing strand whales?},
 volume = {392},
 year = {1998}
}
,@article{2762,
 author = {Sekiguchi, K., Klages, N.T.W. and Best, P.B.},
 journal = {South African Journal of Marine Science},
 pages = {843--861},
 title = {Comparative analysis of the diets of smaller odontocete cetaceans along the coast of southern Africa},
 volume = {12},
 year = {1992}
}
,@article{2762,
 author = {Barlow, J. and Gisiner, R.},
 journal = {Journal of Cetacean Research and Management},
 number = {3},
 pages = {239--250},
 title = {Mitigating, monitoring and assessing the effects of anthropogenic sound on beaked whales},
 volume = {7},
 year = {2006}
}
,@phdthesis{2762,
 author = {MacLeod C.D.},
 school = {PhD Thesis. University of Aberdeen},
 title = {Niche partitioning, distribution and competition in North Atlantic beaked whales},
 year = {2005}
}
,@article{2762,
 author = {Dixon, J.},
 journal = {Victorian Naturalist },
 pages = {34--41},
 title = {A recent stranding of the strap-toothed whale, <i>Mesoplodon layardii</i> (Gray) (Ziphiidae) from Victoria, and a review of Australian records of the species},
 volume = {97},
 year = {1980}
}
,@article{2762,
 author = {Slip, D. J., Moore, G. J., and Green, K.},
 journal = {Marine Mammal Science },
 pages = {575--584},
 title = {Stomach contents of a southern bottlenose whale, <i>Hyperoodon planifrons</i>, stranded at Heard Island},
 volume = {11},
 year = {1995}
}
,@article{2762,
 author = {Cockcroft VG, De Kock AC, Ross GJB, Lord DA.},
 journal = {South African Journal of Zoology},
 pages = {144--148},
 title = {Organochlorines in common dolphins caught in shark nets during the Natal “sardine run".},
 volume = {25},
 year = {1990}
}
,@article{2762,
 author = {Dawson S, Barlow J, Ljungblad D},
 journal = {Marine Mammal Science},
 pages = {335--344},
 title = {Sounds recorded from Baird’s beaked whale, <i>Berardius bairdii</i>},
 volume = {14},
 year = {1998}
}
,@book{2762,
 address = {Wellington, Victoria},
 author = {Baker AN.},
 publisher = {University Press},
 title = {Whales and Dolphins of New Zealand and Australia. An Identification Guide},
 year = {1983}
}
,@article{2762,
 author = {Caretta JV, Price T, Petersen D, Read R.},
 journal = {Marine Fisheries Review},
 pages = {21–30},
 title = {Estimates of marine mammal, sea turtle, and seabird mortality in the California drift gillnet fishery for swordfish and thresher shark, 1996–2002},
 volume = {66},
 year = {2004}
}
,@article{2762,
 author = {Fernández A, Arbelo M, Martín V.},
 journal = {Nature},
 pages = {317–317},
 title = {Whales: No mass strandings since sonar ban},
 volume = {497},
 year = {2013}
}
,@article{2762,
 author = {Frantzis A.},
 journal = {ECS Newsletter},
 pages = {14–20},
 title = {The first mass stranding that was associated with the use of active sonar (Kyparissiakos Gulf, Greece, 1996).},
 volume = {42},
 year = {2004}
}
,@techreport{2762,
 author = {Gambell R, Best PB, Rice DW.},
 title = {Report on the International Indian Ocean whale marking cruise, 24th Nov 1973 - 3rd Feb 1974.},
 year = {1975}
}
,@proceedings{2762,
 editor = {Hofmeyr GJG, Findlay KP, Cockcroft VG, Kotze G, Meyer M, Plön S, Thornton M, Best PB.},
 series = {South African Marine Sciences Symposium, Stellenbosch},
 title = {Spatial and temporal distribution of beaked whale strandings on the South African coast.},
 year = {2014}
}
,@electronic{2762,
 address = {http://www.iucnredlist.org},
 author = {IUCN (International Union for Conservation of Nature).},
 title = {<i>Mesoplodon grayi </i>},
 year = {2012}
}
,@article{2762,
 author = {Kasuya T, Brownell Jr RL, Balcomb III KC.},
 journal = {Report of the International Whaling Commission},
 pages = {969–979},
 title = {Life history of Baird’s beaked whales off the Pacific coast of Japan},
 volume = {47},
 year = {1997}
}
,@article{2762,
 author = {McCann C.},
 journal = {Reports of the Whales Research Institute},
 pages = {111–137},
 title = {A study of the genus <i>Berardius</i>},
 volume = {27},
 year = {1975}
}
,@phdthesis{2762,
 author = {Mignucci-Giannoni AA.},
 school = {University of Puerto Rico},
 title = {Marine mammal strandings in Puerto Rico and the United States and British Virgin Islands. Ph.D. Thesis.},
 year = {1996}
}
,@article{2762,
 author = {Miyazaki N, Wada S.},
 journal = {Scientific Reports of the Whales Research Institute},
 pages = {179–195},
 title = {Observation of Cetacea during whales cruise in the western tropical Pacific.},
 volume = {30},
 year = {1976}
}
,@article{2762,
 author = {Moore JC.},
 journal = {Fieldiana Zoology},
 pages = {209–298},
 title = {Relationships among the living genera of beaked whales},
 volume = {53},
 year = {1968}
}
,@article{2762,
 author = {Paterson RA, van Dyck S.},
 journal = {Scientific Reports of Cetacean Research},
 pages = {63–77},
 title = {Records of beaked whales in Queensland},
 volume = {1},
 year = {1990}
}
,@article{2762,
 author = {Podesta M, D Amico A, Pavan G, Drougas A, Komnenou A, Portunato N.},
 journal = {Journal of Cetacean Research and Management},
 pages = {251},
 title = {A review of Cuvier’s beaked whale strandings in the Mediterranean Sea},
 volume = {7},
 year = {2005}
}
,@article{2762,
 author = {Ross GJB.},
 journal = {Annals of the Cape Provincial Museums (Natural History)},
 pages = {195–204},
 title = {The occurrence of Hector’s beaked whale <i> Mesoplodon hectori<i> (Gray) in South African waters.},
 volume = {8},
 year = {1970}
}
,@article{2762,
 author = {Ross GJB, Cockcroft VG, Cliff G.},
 journal = {Lammergeyer},
 pages = {36–40},
 title = {Additions to marine faunas of South Africa and Natal.},
 volume = {35},
 year = {1985}
}
,@techreport{2762,
 author = {Shallenberger EW.},
 institution = {Marine Mammal Commission},
 title = {The status of Hawaiian cetaceans},
 year = {1981}
}
,@article{2762,
 author = {Taylor RJF.},
 journal = {Proceedings of the Royal Society of London},
 pages = {325–331},
 title = {An unusual record of three species of whale being restricted to pools in Antarctic sea-ice.},
 volume = {129},
 year = {1957}
}
,@article{2762,
 author = {Trites AW, Christensen V, Pauly D.},
 journal = {Journal of Northwest Atlantic Fishery Science},
 pages = {173--187},
 title = {Competition between fisheries and marine mammals for prey and primary production in the Pacific Ocean},
 volume = {22},
 year = {1997}
}
,@techreport{2762,
 address = {Tokyo},
 author = {Yamada TK.},
 institution = {National Science Museum},
 title = {On an unidentified beaked whale found stranded in Kagoshima},
 year = {2002}
}
,@article{9249,
 author = {Ross GJ.},
 journal = {Annals of the Cape Provincial Museums. Natural History},
 pages = {309--319},
 title = {Smaller cetaceans of the south east coast of southern Africa},
 volume = {16},
 year = {1984}
}
,@article{10708,
 author = {Moritz, C},
 journal = {Trends in Ecology and Evolution},
 pages = {373–375},
 title = {Defining ‘Evolutionarily Significant Units’ for conservation},
 volume = {9},
 year = {1994}
}
,@article{13247,
 author = {Boschema, H.},
 journal = {Koninklijke Nederlandse Akademie van Wetenschappen},
 pages = {775--786},
 title = {Maxillary teeth in specimens of <i>Hyperoodon rostratus</i> (Muller) and <i>Mesoplodon grayi</i> Von Haast stranded on the Dutch coasts},
 volume = {53},
 year = {1950}
}
,]
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