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Journal articles on the topic 'Mesoplodon densirostris'

Author: Grafiati

Published: 31 January 2023

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1

Madsen, P. T., N. Aguilar de Soto, P. Arranz, and M. Johnson. "Echolocation in Blainville’s beaked whales (Mesoplodon densirostris)." Journal of Comparative Physiology A 199, no. 6 (May 1, 2013): 451–69. http://dx.doi.org/10.1007/s00359-013-0824-8.

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2

Madsen, P. T. "Biosonar performance of foraging beaked whales (Mesoplodon densirostris)." Journal of Experimental Biology 208, no. 2 (January 15, 2005): 181–94. http://dx.doi.org/10.1242/jeb.01327.

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3

Madsen, Peter T., Mark Johnson, Peter L. Tyack, Natacha Aguilar de Soto, and Walter M. X. Zimmer. "Biosonar performance of foraging Blainvilles beaked whales (Mesoplodon densirostris)." Journal of the Acoustical Society of America 115, no. 5 (May 2004): 2406. http://dx.doi.org/10.1121/1.4780969.

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4

Félix, Fernando, Wojtek Bachara, Nicole Schwarz, and Ben Haase. "Stranding of two Blainville's beaked whales (Mesoplodon densirostris) in Ecuador." Latin American Journal of Aquatic Mammals 9, no. 2 (January 27, 2014): 174–78. http://dx.doi.org/10.5597/lajam00186.

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5

S. Leslie, Matthew, Aisake Batibasaga, Diana S. Weber, David Olson, and Howard C. Rosenbaum. "First record of Blainville's Beaked Whale Mesoplodon densirostris in Fiji." Pacific Conservation Biology 11, no. 4 (2005): 302. http://dx.doi.org/10.1071/pc050302.

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LIttle Is known about the conservation status and geographic range of beaked whales. This note provides the first record of a Blainville's Beaked Whale Mesoplodon densirostris in Fijian waters, and contributes to the available knowledge of a species poorly known in the South Pacific region. On 11 November 2003, a female beaked whale stranded near Viti Levu, Fiji. A lack of suitable references and unfamiliarity with diagnostic morphological characters inhibited species identification at the time of stranding. However, we were able to identify this specimen by using molecular genetic information and applying a diagnostic character approach. DNA sequences from the unknown specimen exhibited nucleotide character states that unambiguously identified it as a Blainville's Beaked Whale. Unfortunately, a lack of associated data collected in this particular event emphasizes a common situation around the world: untrained or poorly equipped personnel (municipalities, governmental agencies or local residents) must manage stranded marine mammals out of necessity. However, information from these events or opportunistic beach surveys assists In furthering research of conservation status and management needs.

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6

Nawojchik, Robert. "FIRST RECORD OF MESOPLODON DENSIROSTRIS (CETACEA: ZIPHIIDAE) FROM RHODE ISLAND." Marine Mammal Science 10, no. 4 (October 1994): 477–80. http://dx.doi.org/10.1111/j.1748-7692.1994.tb00505.x.

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7

Santos, M. B., V. Martin, M. Arbelo, A. Fernández, and G. J. Pierce. "Insights into the diet of beaked whales from the atypical mass stranding in the Canary Islands in September 2002." Journal of the Marine Biological Association of the United Kingdom 87, no. 1 (February 2007): 243–51. http://dx.doi.org/10.1017/s0025315407054380.

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Stomach contents were analysed from three species of beaked whales which mass-stranded shortly after a naval exercise conducted in the Canary Islands in September 2002. Animals from such mass strandings often contain freshly ingested food in their stomachs and can provide a more reliable guide to feeding habits than other strandings. Food remains recovered from seven Cuvier's beaked whales (Ziphius cavirostris) consisted mainly of oceanic cephalopods, the most numerous being Taonius pavo, Histioteuthis sp., Mastigoteuthis schmidti and Octopoteuthis sicula. Many of the cephalopod species found in the diet appear to undertake daily vertical migrations, being found in shallower waters during the night and moving to deeper waters during the day. Single specimens of Blainville's beaked whale (Mesoplodon densirostris) and Gervais' beaked whale (Mesoplodon europaeus) had eaten both fish and cephalopod prey. The most numerous prey remains belonged to gadid fish and viperfish (Chauliodus sp.) respectively. These results are consistent with the limited published data on diet in these species, with Mesoplodon species having a relatively higher proportion of fish in the diet whereas Ziphius specialises on cephalopods.

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8

Ward, Jessica, Susan Jarvis, David Moretti, Ronald Morrissey, Nancy DiMarzio, Mark Johnson, Peter Tyack, Len Thomas, and Tiago Marques. "Beaked whale (Mesoplodon densirostris) passive acoustic detection in increasing ambient noise." Journal of the Acoustical Society of America 129, no. 2 (February 2011): 662–69. http://dx.doi.org/10.1121/1.3531844.

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9

Valle, S. "First record of Mesoplodon densirostris (Blainville 1817) from continental East Africa." African Journal of Marine Science 34, no. 3 (October 1, 2012): 453–54. http://dx.doi.org/10.2989/1814232x.2012.725516.

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10

Martínez-Fernández, Jorge Alberto, Aurora Paniagua-Mendoza, Fernando R. Elorriaga-Verplancken, Hiram Rosales-Nanduca, Anidia Blanco-Jarvio, Roberto Robles-Hernández, Claudia Ballínez, and Wojtek Bachara. "First Record of a Blainville’s Beaked Whale (Mesoplodon densirostris) in Cuba." Aquatic Mammals 48, no. 6 (November 15, 2022): 520–24. http://dx.doi.org/10.1578/am.48.6.2022.520.

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11

Stanistreet, Joy E., Douglas P. Nowacek, Simone Baumann-Pickering, Joel T. Bell, Danielle M. Cholewiak, John A. Hildebrand, Lynne E. W. Hodge, Hilary B. Moors-Murphy, Sofie M. Van Parijs, and Andrew J. Read. "Using passive acoustic monitoring to document the distribution of beaked whale species in the western North Atlantic Ocean." Canadian Journal of Fisheries and Aquatic Sciences 74, no. 12 (December 2017): 2098–109. http://dx.doi.org/10.1139/cjfas-2016-0503.

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Little is known about the ecology of many beaked whale species, despite concerns raised by mass strandings linked to certain sources of anthropogenic noise. Here, we used passive acoustic monitoring to examine spatial and temporal patterns in beaked whale occurrence at six locations along the continental slope in the western North Atlantic Ocean. We analyzed 2642 days of recordings collected between 2011 and 2015, and identified echolocation signals from northern bottlenose whales (Hyperoodon ampullatus), Cuvier’s (Ziphius cavirostris), Sowerby’s (Mesoplodon bidens), Gervais’, (Mesoplodon europaeus), and Blainville’s (Mesoplodon densirostris) beaked whales, and one signal type of unknown origin. We recorded multiple species at each site, with detections generally occurring year-round, and observed latitudinal gradients and site-specific variation in relative species occurrence. Notably, we regularly detected Cuvier’s beaked whales in a region where they have not been commonly observed, and discovered potential habitat partitioning among Cuvier’s and Gervais’ beaked whales within their overlapping ranges. This information on the distribution and seasonal occurrence of North Atlantic beaked whale species offers new insight into patterns of habitat use, and provides a year-round baseline from which to assess potential anthropogenic impacts.

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12

Covelo, Pablo, Jose A. Martínez-Cedeira, Ángela Llavona, Juan I. Díaz, and Alfredo López. "Strandings of Beaked Whales (Ziphiidae) in Galicia (NW Spain) between 1990 and 2013." Journal of the Marine Biological Association of the United Kingdom 96, no. 4 (April 28, 2015): 925–31. http://dx.doi.org/10.1017/s002531541500048x.

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In the coast of Galicia an average of 200 stranded cetaceans are reported annually. From 1990 to 2013, 21 individuals of four species of the family Ziphiidae were found: 15 Cuvier's beaked whales (Ziphius cavirostris), two Sowerby's beaked whales (Mesoplodon bidens), one True's beaked whale (Mesoplodon mirus) and one Blainville's beaked whale (Mesoplodon densirostris), as well as two unidentified ones. These were the first records in Galicia for True's beaked whale and Blainville's beaked whale. The study of the distribution of oceanic species considering only stranded animals has limitations, but is a good approach to this not well-known cetacean family. Due to the small number of individuals of the different species, statistical analyses for geographic or seasonal patterns were only carried out for the Cuvier's beaked whales. Between the periods of 1990–2002 and 2003–2013 significant differences were found for geographic and seasonal occurrence patterns. Over the last decade strandings were located only in the north area of the region, mainly during the spring season, while in the previous decade they were located along the three considered areas and only in autumn and winter.

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13

Felipe-Jiménez, Idaira, Antonio Fernández, Marisa Andrada, Manuel Arbelo, Simone Segura-Göthlin, Ana Colom-Rivero, and Eva Sierra. "Contribution to Herpesvirus Surveillance in Beaked Whales Stranded in the Canary Islands." Animals 11, no. 7 (June 28, 2021): 1923. http://dx.doi.org/10.3390/ani11071923.

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Herpesviruses (HVs) (Alpha- and Gammaherpesvirinae subfamilies) have been detected in several species of cetaceans with different pathological implications. However, available information on their presence in beaked whales (BWs) is still scarce. In this study, a total of 55 BWs (35 Ziphius cavirostris and 20 animals belonging to the Mesoplodon genus) were analyzed. Samples (n = 294) were obtained from BWs stranded along the coasts of the Canary Islands (1990–2017). Molecular detection of HV was performed by means of a conventional nested PCR based on the DNA polymerase gene. Herpesvirus was detected in 14.45% (8/55) of the analyzed BWs, including 2 positive animals from a previous survey. A percentage positivity of 8.57% was found within the Cuvier’s BW group, while the percentage of positivity rose to 25% within the Mesoplodon genus group (three M. densirostris, one M. europaeus, and one M. bidens). All the obtained sequences from this study belonged to the Alphaherpesvirinae subfamily, from which three are considered novel sequences, all of them within the Mesoplodon genus group. In addition, to our knowledge, this is the first description of HV infection in Gervais’ and Sowerby’s BWs. Three out of eight HV-positive BWs displayed histopathological lesions indicative of active viral replication.

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14

Johnson, M., L. S. Hickmott, N. Aguilar Soto, and P. T. Madsen. "Echolocation behaviour adapted to prey in foraging Blainville's beaked whale (Mesoplodon densirostris)." Proceedings of the Royal Society B: Biological Sciences 275, no. 1631 (November 7, 2007): 133–39. http://dx.doi.org/10.1098/rspb.2007.1190.

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15

MacLeod, Colin D. "Possible functions of the ultradense bone in the rostrum of Blainville's beaked whale (Mesoplodon densirostris)." Canadian Journal of Zoology 80, no. 1 (January 1, 2002): 178–84. http://dx.doi.org/10.1139/z01-188.

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The rostrum of Blainville's beaked whale, Mesoplodon densirostris, becomes secondarily ossified, particularly in males, as individuals mature. This mesorostral ossification forms the densest bone currently known and represents a considerable investment of resources for this species. Three functions for this mesorostral ossification have been proposed: prevention of damage to the rostrum during aggressive malemale interactions, ballast to aid deep diving, and sound transmission. These functions were assessed using data from museum specimens and observations of this species in the wild. Prevention of damage to the rostrum during aggressive malemale interactions was found to be the most likely function, based on the currently available data.

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16

Iglesias, R., S. D'Amelio, S. Ingrosso, S. Farjallah, J. A. Martínez-Cedeira, and J. M. García-Estévez. "Molecular and morphological evidence for the occurrence of Anisakis sp. A (Nematoda, Anisakidae) in the Blainville's beaked whale Mesoplodon densirostris." Journal of Helminthology 82, no. 4 (December 2008): 305–8. http://dx.doi.org/10.1017/s0022149x08996978.

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AbstractTwenty-three adults (only one male) and two fourth-stage larvae of Anisakis, recovered from the stomach of a Blainville's beaked whale (Mesoplodon densirostris) stranded in Galicia (NW Spain), were studied morphologically and molecularly. The polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and sequencing studies carried out on the ribosomal DNA spacers and on the cox2 mitochondrial gene confirm that these nematodes belong to the taxon Anisakis sp. A, which was previously detected as a larval stage in fishes from Madeiran waters. In addition, our molecular studies demonstrate that Anisakis sp. A and the taxon Anisakis sp., previously found in other Mesoplodon spp., are the same species. The adults of Anisakis sp. A are morphologically similar to A. ziphidarum but with a shorter body length and longer spicules (right spicule 2.42 mm, left spicule 2.30 mm). Since the poor condition of the male tail cuticle prevented a proper description of the caudal plates and the pattern of caudal papillae, we propose to retain the name Anisakis sp. A until new males are described correctly.

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17

Cohen, Rebecca E., Kaitlin E. Frasier, Simone Baumann-Pickering, Sean M. Wiggins, Macey A. Rafter, Lauren M. Baggett, and John A. Hildebrand. "Identification of western North Atlantic odontocete echolocation click types using machine learning and spatiotemporal correlates." PLOS ONE 17, no. 3 (March 24, 2022): e0264988. http://dx.doi.org/10.1371/journal.pone.0264988.

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A combination of machine learning and expert analyst review was used to detect odontocete echolocation clicks, identify dominant click types, and classify clicks in 32 years of acoustic data collected at 11 autonomous monitoring sites in the western North Atlantic between 2016 and 2019. Previously-described click types for eight known odontocete species or genera were identified in this data set: Blainville’s beaked whales (Mesoplodon densirostris), Cuvier’s beaked whales (Ziphius cavirostris), Gervais’ beaked whales (Mesoplodon europaeus), Sowerby’s beaked whales (Mesoplodon bidens), and True’s beaked whales (Mesoplodon mirus), Kogia spp., Risso’s dolphin (Grampus griseus), and sperm whales (Physeter macrocephalus). Six novel delphinid echolocation click types were identified and named according to their median peak frequencies. Consideration of the spatiotemporal distribution of these unidentified click types, and comparison to historical sighting data, enabled assignment of the probable species identity to three of the six types, and group identity to a fourth type. UD36, UD26, and UD28 were attributed to Risso’s dolphin (G. griseus), short-finned pilot whale (G. macrorhynchus), and short-beaked common dolphin (D. delphis), respectively, based on similar regional distributions and seasonal presence patterns. UD19 was attributed to one or more species in the subfamily Globicephalinae based on spectral content and signal timing. UD47 and UD38 represent distinct types for which no clear spatiotemporal match was apparent. This approach leveraged the power of big acoustic and big visual data to add to the catalog of known species-specific acoustic signals and yield new inferences about odontocete spatiotemporal distribution patterns. The tools and call types described here can be used for efficient analysis of other existing and future passive acoustic data sets from this region.

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18

Dinis, Ana, Raquel Marques, Luís Dias, Dinarte Sousa, Claudia Gomes, Nicolau Abreu, and Felipe Alves. "Site Fidelity of Blainville’s Beaked Whale (Mesoplodon densirostris) off Madeira Island (Northeast Atlantic)." Aquatic Mammals 43, no. 4 (July 15, 2017): 387–90. http://dx.doi.org/10.1578/am.43.4.2017.387.

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19

Arbelo, Manuel, Edwige N. Bellière, Eva Sierra, Simona Sacchinni, Fernando Esperón, Marisa Andrada, Miguel Rivero, Josue Diaz-Delgado, and Antonio Fernández. "Herpes virus infection associated with interstitial nephritis in a beaked whale (Mesoplodon densirostris)." BMC Veterinary Research 8, no. 1 (2012): 243. http://dx.doi.org/10.1186/1746-6148-8-243.

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20

Rankin, Shannon, and Jay Barlow. "Sounds recorded in the presence of Blainville’s beaked whales, Mesoplodon densirostris, near Hawai’i." Journal of the Acoustical Society of America 122, no. 1 (July 2007): 42–45. http://dx.doi.org/10.1121/1.2743159.

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21

Saliki, Jeremiah T., Emily J. Cooper, David S. Rotstein, Shannon L. Caseltine, D. Ann Pabst, William A. McLellan, Pamela Govett, Craig Harms, Kara A. Smolarek, and Carlos H. Romero. "A Novel Gammaherpesvirus Associated with Genital Lesions in a Blainville's Beaked Whale (Mesoplodon densirostris)." Journal of Wildlife Diseases 42, no. 1 (January 2006): 142–48. http://dx.doi.org/10.7589/0090-3558-42.1.142.

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22

Pacini, A. F., P. E. Nachtigall, C. T. Quintos, T. D. Schofield, D. A. Look, G. A. Levine, and J. P. Turner. "Audiogram of a stranded Blainville's beaked whale (Mesoplodon densirostris) measured using auditory evoked potentials." Journal of Experimental Biology 214, no. 14 (June 22, 2011): 2409–15. http://dx.doi.org/10.1242/jeb.054338.

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23

Baird, Robin W., Daniel L. Webster, Daniel J. McSweeney, Allan D. Ligon, Gregory S. Schorr, and Jay Barlow. "Diving behaviour of Cuvier’s (Ziphius cavirostris) and Blainville’s (Mesoplodon densirostris) beaked whales in Hawai‘i." Canadian Journal of Zoology 84, no. 8 (August 2006): 1120–28. http://dx.doi.org/10.1139/z06-095.

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Beaked whales (family Ziphiidae) are thought to be among the longest and deepest diving mammals, and some species appear to be prone to mass-strand in response to high-intensity sonar. We studied diving behaviour of Cuvier’s ( Ziphius cavirostris G. Cuvier, 1823) and Blainville’s ( Mesoplodon densirostris (Blainville, 1817)) beaked whales in Hawaiian waters using suction-cup-attached time–depth recorders. Six whales, two Cuvier’s and four Blainville’s, were tagged and 41 h of dive data were collected. While Cuvier’s beaked whales were found in significantly deeper water depths (median depth = 2079 m) than Blainville’s beaked whales (median depth = 922 m), several aspects of diving were similar between the two species: (i) both regularly dove for 48–68 min to depths greater than 800 m (maximum 1408 m for Blainville’s and 1450 m for Cuvier’s); (ii) ascent rates for long/deep dives were substantially slower than descent rates, while for shorter dives there were no consistent differences; and (iii) both spent prolonged periods of time (66–155 min) in the upper 50 m of the water column. Based on time intervals between dives for the Cuvier’s beaked whales, such long dives were likely aerobic, but both species appeared to prepare for long dives by spending extended periods of time near the surface.

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24

Li, Z., and J. D. Pasteris. "Chemistry of bone mineral, based on the hypermineralized rostrum of the beaked whale Mesoplodon densirostris." American Mineralogist 99, no. 4 (April 1, 2014): 645–53. http://dx.doi.org/10.2138/am.2014.4571.

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25

Dunn, Charlotte, Diane Claridge, John Durban, Jessica Shaffer, David Moretti, Peter Tyack, and Luke Rendell. "Insights into Blainville's beaked whale (Mesoplodon densirostris) echolocation ontogeny from recordings of mother-calf pairs." Marine Mammal Science 33, no. 1 (September 16, 2016): 356–64. http://dx.doi.org/10.1111/mms.12351.

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26

Joyce, Trevor W., John W. Durban, Diane E. Claridge, Charlotte A. Dunn, Leigh S. Hickmott, Holly Fearnbach, Karin Dolan, and David Moretti. "Behavioral responses of satellite tracked Blainville's beaked whales ( Mesoplodon densirostris ) to mid‐frequency active sonar." Marine Mammal Science 36, no. 1 (June 17, 2019): 29–46. http://dx.doi.org/10.1111/mms.12624.

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27

Keating, Jennifer L., Jay Barlow, and Shannon Rankin. "Shifts in frequency-modulated pulses recorded during an encounter with Blainville's beaked whales (Mesoplodon densirostris)." Journal of the Acoustical Society of America 140, no. 2 (August 2016): EL166—EL171. http://dx.doi.org/10.1121/1.4959598.

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28

Shaffer, Jessica Ward, David Moretti, Susan Jarvis, Peter Tyack, and Mark Johnson. "Effective beam pattern of the Blainville's beaked whale (Mesoplodon densirostris) and implications for passive acoustic monitoring." Journal of the Acoustical Society of America 133, no. 3 (March 2013): 1770–84. http://dx.doi.org/10.1121/1.4776177.

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29

Johnson, M., P. T. Madsen, W. M. X. Zimmer, N. A. de Soto, and P. L. Tyack. "Foraging Blainville's beaked whales (Mesoplodon densirostris) produce distinct click types matched to different phases of echolocation." Journal of Experimental Biology 209, no. 24 (December 15, 2006): 5038–50. http://dx.doi.org/10.1242/jeb.02596.

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30

Ward, Jessica, David Moretti, Ronald P. Morrissey, Nancy A. Dimarzio, Peter Tyack, and Mark Johnson. "Mesoplodon densirostris transmission beam pattern estimated from passive acoustic bottom mounted hydrophones and a DTag recording." Journal of the Acoustical Society of America 123, no. 5 (May 2008): 3619. http://dx.doi.org/10.1121/1.2934833.

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31

Manzano-Roth, Roanne, E. Elizabeth Henderson, Stephen W. Martin, Cameron Martin, and Brian Matsuyama. "Impacts of U.S. Navy Training Events on Blainville’s Beaked Whale (Mesoplodon densirostris) Foraging Dives in Hawaiian Waters." Aquatic Mammals 42, no. 4 (December 1, 2016): 507–18. http://dx.doi.org/10.1578/am.42.4.2016.507.

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32

Moretti, David, Len Thomas, Tiago Marques, John Harwood, Ashley Dilley, Bert Neales, Jessica Shaffer, et al. "A Risk Function for Behavioral Disruption of Blainville’s Beaked Whales (Mesoplodon densirostris) from Mid-Frequency Active Sonar." PLoS ONE 9, no. 1 (January 21, 2014): e85064. http://dx.doi.org/10.1371/journal.pone.0085064.

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33

Fernández, A., J. F. Edwards, F. Rodríguez, A. Espinosa de los Monteros, P. Herráez, P. Castro, J. R. Jaber, V. Martín, and M. Arbelo. "“Gas and Fat Embolic Syndrome” Involving a Mass Stranding of Beaked Whales (Family Ziphiidae) Exposed to Anthropogenic Sonar Signals." Veterinary Pathology 42, no. 4 (July 2005): 446–57. http://dx.doi.org/10.1354/vp.42-4-446.

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A study of the lesions of beaked whales (BWs) in a recent mass stranding in the Canary Islands following naval exercises provides a possible explanation of the relationship between anthropogenic, acoustic (sonar) activities and the stranding and death of marine mammals. Fourteen BWs were stranded in the Canary Islands close to the site of an international naval exercise (Neo-Tapon 2002) held on 24 September 2002. Strandings began about 4 hours after the onset of midfrequency sonar activity. Eight Cuvier's BWs (Ziphius cavirostris), one Blainville's BW (Mesoplodon densirostris), and one Gervais' BW (Mesoplodon europaeus) were examined postmortem and studied histopathologically. No inflammatory or neoplastic processes were noted, and no pathogens were identified. Macroscopically, whales had severe, diffuse congestion and hemorrhage, especially around the acoustic jaw fat, ears, brain, and kidneys. Gas bubble-associated lesions and fat embolism were observed in the vessels and parenchyma of vital organs. In vivo bubble formation associated with sonar exposure that may have been exacerbated by modified diving behavior caused nitrogen supersaturation above a threshold value normally tolerated by the tissues (as occurs in decompression sickness). Alternatively, the effect that sonar has on tissues that have been supersaturated with nitrogen gas could be such that it lowers the threshold for the expansion of in vivo bubble precursors (gas nuclei). Exclusively or in combination, these mechanisms may enhance and maintain bubble growth or initiate embolism. Severely injured whales died or became stranded and died due to cardiovascular collapse during beaching. The present study demonstrates a new pathologic entity in cetaceans. The syndrome is apparently induced by exposure to mid-frequency sonar signals and particularly affects deep, long-duration, repetitive-diving species like BWs.

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34

MacLeod, Colin D., Nan Hauser, and Hoyt Peckham. "Diversity, relative density and structure of the cetacean community in summer months east of Great Abaco, Bahamas." Journal of the Marine Biological Association of the United Kingdom 84, no. 2 (April 2004): 469–74. http://dx.doi.org/10.1017/s0025315404009476h.

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Little is known about cetacean communities in the tropical and sub-tropical Atlantic. This paper describes the cetacean community found east of Great Abaco in the northern Bahamas (26·5°N) during summer months between 1998 and 2001. Nine species of cetaceans were recorded, which could be divided into two distinct groupings: firstly, ‘permanent’ species, which had relative sightings rates between 0·026–0·084 sightings per hour and which were recorded on many occasions in all years and most months; secondly, ‘sporadic’ species, which had relative sightings rates an order of magnitude lower (0·004–0·008 sightings per hour) and which were recorded on very few occasions. The ‘permanent’ species were the Stenella frontalis (Atlantic spotted dolphin), Kogia simus (the dwarf sperm whale), Mesoplodon densirostris (Blainville's beaked whale) and Ziphius cavirostris (Cuvier's beaked whale). These four species differed significantly in the depth of grid squares utilized (χ=20·25, df=9, P<0·01) suggesting that these species occupied four separate niches. Stenella frontalis dominated the surface feeding niche, while the remaining three deep-diving species segregated into different depth ranges. Kogia simus was the dominant species in water depths of less than 200 m, M. densirostris in water depths of 200 to 1000 m and Z. cavirostris in water depths of greater than 1000 m. The overall relative density (2·533 individuals per hour of effort) and diversity of species in the study area was relatively low and may relate to low levels of local productivity. It is hypothesized that the four ‘permanent’ species may competitively exclude ecologically similar species, resulting in a reduced number of species and that ‘sporadic’ species may only enter the study area during times of higher than usual productivity when the ‘permanent’ species are no longer able to dominate their individual niches.

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35

Henderson, E. Elizabeth, Stephen W. Martin, Roanne Manzano-Roth, and Brian M. Matsuyama. "Occurrence and Habitat Use of Foraging Blainville’s Beaked Whales (Mesoplodon densirostris) on a U.S. Navy Range in Hawaii." Aquatic Mammals 42, no. 4 (December 1, 2016): 549–62. http://dx.doi.org/10.1578/am.42.4.2016.549.

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36

Pastene, Luis A., Kenichi Numachi, Maria Jofre, Mitzi Acevedo, and Gerald Joyce. "FIRST RECORD OF THE BLAINVILLE's BEAKED WHALE, MESOPLODON DENSIROSTRIS BLAINVILLE, 1817 (CETACEA, ZIPHIIDAE) IN THE EASTERN SOUTH PACIFIC." Marine Mammal Science 6, no. 1 (January 1990): 82–84. http://dx.doi.org/10.1111/j.1748-7692.1990.tb00229.x.

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37

Smith, Adam B., Aude F. Pacini, and Paul E. Nachtigall. "Modulation rate transfer functions from four species of stranded odontocete (Stenella longirostris, Feresa attenuata, Globicephala melas, and Mesoplodon densirostris)." Journal of Comparative Physiology A 204, no. 4 (January 19, 2018): 377–89. http://dx.doi.org/10.1007/s00359-018-1246-4.

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Simonis, Anne E., Robert L. Brownell, Bruce J. Thayre, Jennifer S. Trickey, Erin M. Oleson, Roderick Huntington, and Simone Baumann-Pickering. "Co-occurrence of beaked whale strandings and naval sonar in the Mariana Islands, Western Pacific." Proceedings of the Royal Society B: Biological Sciences 287, no. 1921 (February 19, 2020): 20200070. http://dx.doi.org/10.1098/rspb.2020.0070.

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Mid-frequency active sonar (MFAS), used for antisubmarine warfare (ASW), has been associated with multiple beaked whale (BW) mass stranding events. Multinational naval ASW exercises have used MFAS offshore of the Mariana Archipelago semi-annually since 2006. We report BW and MFAS acoustic activity near the islands of Saipan and Tinian from March 2010 to November 2014. Signals from Cuvier's ( Ziphius cavirostris) and Blainville's beaked whales ( Mesoplodon densirostris ), and a third unidentified BW species, were detected throughout the recording period. Both recorders documented MFAS on 21 August 2011 before two Cuvier's beaked whales stranded on 22–23 August 2011. We compared the history of known naval operations and BW strandings from the Mariana Archipelago to consider potential threats to BW populations. Eight BW stranding events between June 2006 and January 2019 each included one to three animals. Half of these strandings occurred during or within 6 days after naval activities, and this co-occurrence is highly significant. We highlight strandings of individual BWs can be associated with ASW, and emphasize the value of ongoing passive acoustic monitoring, especially for beaked whales that are difficult to visually detect at sea. We strongly recommend more visual monitoring efforts, at sea and along coastlines, for stranded cetaceans before, during and after naval exercises.

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Baird, Robin. "Short Note: Open-Ocean Movements of a Satellite-Tagged Blainville’s Beaked Whale (Mesoplodon densirostris): Evidence for an Offshore Population in Hawai‘i?" Aquatic Mammals 37, no. 4 (December 1, 2011): 506–11. http://dx.doi.org/10.1578/am.37.4.2011.506.

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Smith, Adam B., Aude F. Pacini, and Paul E. Nachtigall. "Correction to: Modulation rate transfer functions from four species of stranded odontocete (Stenella longirostris, Feresa attenuata, Globicephala melas, and Mesoplodon densirostris)." Journal of Comparative Physiology A 207, no. 4 (April 29, 2021): 595. http://dx.doi.org/10.1007/s00359-021-01488-0.

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Moretti, David, Ronald Morrissey, Nancy DiMarzio, and Jessica Ward. "Verified passive acoustic detection of beaked whales (Mesoplodon densirostris) using distributed bottom‐mounted hydrophones in the tongue of the ocean, Bahamas." Journal of the Acoustical Society of America 119, no. 5 (May 2006): 3374. http://dx.doi.org/10.1121/1.4786579.

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McSweeney, Daniel J., Robin W. Baird, and Sabre D. Mahaffy. "SITE FIDELITY, ASSOCIATIONS, AND MOVEMENTS OF CUVIER'S (ZIPHIUS CAVIROSTRIS) AND BLAINVILLE'S (MESOPLODON DENSIROSTRIS) BEAKED WHALES OFF THE ISLAND OF HAWAI?I." Marine Mammal Science 23, no. 3 (July 2007): 666–87. http://dx.doi.org/10.1111/j.1748-7692.2007.00135.x.

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43

Sacchini, Simona, Antonio Fernández, Blanca Mompeó, Raquel Ramírez, Manuel Arbelo, Unn Holgersen, Oscar Quesada-Canales, Ayoze Castro-Alonso, and Marisa Andrada. "Toothed Whales Have Black Neurons in the Blue Spot." Veterinary Sciences 9, no. 10 (September 26, 2022): 525. http://dx.doi.org/10.3390/vetsci9100525.

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Neuromelanin (NM) is a dark polymer pigment that is located mostly in the human substantia nigra, and in the locus ceruleus, referred to as “the blue spot”. NM increases linearly with age, and has been described mainly in the human brain; however, it also occurs in the neurons of monkeys, horses, giraffes, cattle, sheep, goats, dogs, rats, and even in frogs. While in most of these mammals NM shows the histochemical and ultrastructural features typical of lipofuscins, human NM is confined within cytoplasmic organelles that are surrounded by a double membrane, suggesting an autophagic origin. In a study on the morphology of the locus ceruleus of the family Delphinidae, the presence of a variable quantity of NM in the interior of locus ceruleus neurons was observed for the first time; meanwhile, nothing is known about its ultrastructure and composition. Transmission electron microscopy demonstrated in two toothed whales—an Atlantic spotted dolphin (Stenella frontalis; family Delphinidae) and a Blainville’s beaked whale (Mesoplodon densirostris; family Ziphiidae)—the presence of melanin granules associated with lipid droplets and membranes that were very similar to that of human NM. The relationship between NM and neuronal vulnerability must be studied in depth, and cetaceans may offer a new natural-spontaneous comparative model for the study of NM and its implication in neurodegenerative diseases.

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McCarthy, Elena, David Moretti, Len Thomas, Nancy DiMarzio, Ronald Morrissey, Susan Jarvis, Jessica Ward, Annamaria Izzi, and Ashley Dilley. "Changes in spatial and temporal distribution and vocal behavior of Blainville's beaked whales (Mesoplodon densirostris) during multiship exercises with mid-frequency sonar." Marine Mammal Science 27, no. 3 (February 24, 2011): E206—E226. http://dx.doi.org/10.1111/j.1748-7692.2010.00457.x.

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Law, R. J., C. R. Allchin, B. R. Jones, P. D. Jepson, J. R. Baker, and C. J. H. Spurrier. "Metals and organochlorines in tissues of a Blainville's beaked whale (Mesoplodon densirostris) and a killer whale (Orcinus orca) stranded in the United Kingdom." Marine Pollution Bulletin 34, no. 3 (March 1997): 208–12. http://dx.doi.org/10.1016/s0025-326x(96)00148-8.

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Webster, Imogen, Vic Cockcroft, Adele Cadinouche, and Annette Huggins. "Cetacean diversity of Mauritius." IWC Journal of Cetacean Research and Management 21, no. 1 (September 10, 2020): 45–58. http://dx.doi.org/10.47536/jcrm.v21i1.190.

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There is limited information concerning the cetaceans inhabiting the coastal waters of Mauritius. This document details the sightings of cetaceans encountered during April 2008 – September 2014. Boat-based surveys were conducted throughout the year, primarily focusing on spinner and bottlenose dolphin populations that are important for the local dolphin-watching industry. More than 1246 hours over 749 days of surveys were spent searching for cetaceans. All cetaceans encountered were recorded. During 2013 and 2014, dedicated diversity surveys were conducted and 2443.6km of search effort was covered around the islands. The encounter rate was 0.025 cetacean sightings/km. Over the total study period 13 species were recorded from 1459 sightings. Species included: Megaptera novaeangliae, Stenella longirostris, Tursiops aduncus, Tursiops truncatus, Globicephala macrorhynchus, Stenella attenuata, Physeter macrocephalus, Mesoplodon densirostris, Feresa attenuata, Peponocephala electra, Grampus griseus and Ziphius cavirostris. In addition, there were strandings of Kogia sima and Ziphius cavirostris. The most common species encountered were spinner dolphins, Indo-Pacific bottlenose dolphins, humpback whales and sperm whales. As expected only humpback whales showed any seasonality in monthly encounter rates (Kruskal-Wallis H = 42.39, Hc = 54.25, p < 0.001). The overall Shannon diversity index was 0.58 (95% CI 0.57–0.60) though this ranged between 0.77 in 2009 to 0.25 in 2014. The Shannon index value for the diversity study was 0.83 (95% CI 0.74–0.91). This study demonstrates the richness of the waters around Mauritius and the importance of the area for beaked whales, migrating humpback whales and the presence of resident sperm whales.

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Jepson, P. D., R. Deaville, I. A. P. Patterson, A. M. Pocknell, H. M. Ross, J. R. Baker, F. E. Howie, R. J. Reid, A. Colloff, and A. A. Cunningham. "Acute and Chronic Gas Bubble Lesions in Cetaceans Stranded in the United Kingdom." Veterinary Pathology 42, no. 3 (May 2005): 291–305. http://dx.doi.org/10.1354/vp.42-3-291.

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The first evidence suggestive of in vivo gas bubble formation in cetacea, including eight animals stranded in the UK, has recently been reported. This article presents the pathologic findings from these eight UK-stranded cetaceans and two additional UK-stranded cetacean cases in detail. Hepatic gas-filled cavitary lesions (0.2-6.0 cm diameter) involving approximately 5–90% of the liver volume were found in four (two juvenile, two adult) Risso's dolphins ( Grampus griseus), three (two adult, one juvenile) common dolphins ( Delphinus delphis), an adult Blainville's beaked whale ( Mesoplodon densirostris), and an adult harbour porpoise ( Phocoena phocoena). Histopathologic examination of the seven dolphin cases with gross liver cavities revealed variable degrees of pericavitary fibrosis, microscopic, intrahepatic, spherical, nonstaining cavities (typically 50–750 μm in diameter) consistent with gas emboli within distended portal vessels and sinusoids and associated with hepatic tissue compression, hemorrhages, fibrin/organizing thrombi, and foci of acute hepatocellular necrosis. Two common dolphins also had multiple and bilateral gross renal cavities (2.0–9.0 mm diameter) that, microscopically, were consistent with acute ( n = 2) and chronic ( n = 1) arterial gas emboli-induced renal infarcts. Microscopic, bubblelike cavities were also found in mesenteric lymph node ( n = 4), adrenal ( n = 2), spleen ( n = 2), pulmonary associated lymph node ( n = 1), posterior cervical lymph node ( n = 1), and thyroid ( n = 1). No bacterial organisms were isolated from five of six cavitated livers and one of one cavitated kidneys. The etiology and pathogenesis of these lesions are not known, although a decompression-related mechanism involving embolism of intestinal gas or de novo gas bubble (emboli) development derived from tissues supersaturated with nitrogen is suspected.

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Moretti, David, Ronald P. Morrissey, Nancy A. Dimarzio, Jessica Ward, Susan Jarvis, Elena McCarthy, and Annamaria Izzi. "An opportunistic passive acoustics study of the spatial and temporal distribution and vocal behavior of Blainville's beaked whale (“Mesoplodon densirostris”) in the presence of mid‐frequency active sonar." Journal of the Acoustical Society of America 123, no. 5 (May 2008): 3780. http://dx.doi.org/10.1121/1.2935422.

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Moretti, D., T. A. Marques, L. Thomas, N. DiMarzio, A. Dilley, R. Morrissey, E. McCarthy, J. Ward, and S. Jarvis. "A dive counting density estimation method for Blainville’s beaked whale (Mesoplodon densirostris) using a bottom-mounted hydrophone field as applied to a Mid-Frequency Active (MFA) sonar operation." Applied Acoustics 71, no. 11 (November 2010): 1036–42. http://dx.doi.org/10.1016/j.apacoust.2010.04.011.

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Brookwell, Ross, Kimberly Finlayson, and Jason P. van de Merwe. "The Karyotype of Blainville’s Beaked Whale, Mesoplodon densirostris." Cytogenetic and Genome Research, November 18, 2020, 1–6. http://dx.doi.org/10.1159/000511730.

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The karyotype of the Odontocete whale, <i>Mesoplodon densirostris</i>, has not been previously reported. The chromosome number is determined to be 2n = 42, and the karyotype is presented using G-, C-, and nucleolar organizer region (NOR) banding. The findings include NOR regions on 2 chromosomes, regions of heterochromatic variation, a large block of heterochromatin on the X chromosome, and a relatively large Y chromosome. The karyotype is compared to published karyograms of 2 other species of <i>Mesoplodon</i>.

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