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Journal articles on the topic 'Baleen whales Baleen whales Baleen whales Epidermis'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Volkenandt, Mareike, Ian O’Connor, Jean-Marc Guarini, Simon Berrow, and Ciaran O’Donnell. "Fine-scale spatial association between baleen whales and forage fish in the Celtic Sea." Canadian Journal of Fisheries and Aquatic Sciences 73, no. 2 (2016): 197–204. http://dx.doi.org/10.1139/cjfas-2015-0073.

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Baleen whales can be regularly observed in the Celtic Sea; however, little is known about their local foraging behaviour. The study objective was to determine whether or not baleen whales selectively prey upon particular forage fish species or, on the contrary, is predation on the Celtic Sea plateau driven by random encounters between prey and predator? Concurrent sighting surveys for fin (Balaenoptera physalus), minke (Balaenoptera acutorostrata), and humpback (Megaptera novaeangliae) whales were carried out simultaneously from 2007 to 2013 during dedicated fisheries acoustic surveys assessin

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2

Lubetkin, S. C., J. E. Zeh, C. Rosa, and J. C. George. "Age estimation for young bowhead whales (Balaena mysticetus) using annual baleen growth increments." Canadian Journal of Zoology 86, no. 6 (2008): 525–38. http://dx.doi.org/10.1139/z08-028.

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We compiled age estimates and baleen plate δ13C data from 86 bowhead whales ( Balaena mysticetus L., 1758). We used previous whale age estimates based on aspartic acid racemization (AAR) and corpora counts to extend the use of δ13C data for age determination from cycle counting to a modified exponential model using annual baleen growth increments. Our approach used the growth increment data from individual whales in a nonlinear mixed effects model to assess both population-level and whale-specific growth parameters. Although age estimates from baleen-based models become less precise as the wha

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3

Lubetkin, S. C., J. E. Zeh, and J. C. George. "Statistical modeling of baleen and body length at age in bowhead whales (Balaena mysticetus)." Canadian Journal of Zoology 90, no. 8 (2012): 915–31. http://dx.doi.org/10.1139/z2012-057.

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We used baleen lengths and age estimates from 175 whales and body lengths and age estimates from 205 whales to test which of several single- and multi-stage growth models best characterized age-specific baleen and body lengths for bowhead whales ( Balaena mysticetus L., 1758) with the goal of determining which would be best for predicting whale age based on baleen or body length. Previous age estimates were compiled from several techniques, each of which is valid over a relatively limited set of physical characteristics. The best fitting single-stage growth model was a variation of the von Ber

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4

Würsig, Bernd. "The Behavior of Baleen Whales." Scientific American 258, no. 4 (1988): 102–7. http://dx.doi.org/10.1038/scientificamerican0488-102.

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5

Clapham, Phil. "Why do Baleen Whales Migrate?." Marine Mammal Science 17, no. 2 (2001): 432–36. http://dx.doi.org/10.1111/j.1748-7692.2001.tb01289.x.

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6

Cassoff, RM, KM Moore, WA McLellan, SG Barco, DS Rotstein, and MJ Moore. "Lethal entanglement in baleen whales." Diseases of Aquatic Organisms 96, no. 3 (2011): 175–85. http://dx.doi.org/10.3354/dao02385.

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7

Popov, Ya. "Toothless Ancestor of Baleen Whales." Priroda, no. 12 (December 2018): 48–49. http://dx.doi.org/10.31857/s0032874x0003331-3.

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8

Werth, Alexander J., Robert W. Harriss, Michael V. Rosario, J. Craig George, and Todd L. Sformo. "Hydration affects the physical and mechanical properties of baleen tissue." Royal Society Open Science 3, no. 10 (2016): 160591. http://dx.doi.org/10.1098/rsos.160591.

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Baleen, an anisotropic oral filtering tissue found only in the mouth of mysticete whales and made solely of alpha-keratin, exhibits markedly differing physical and mechanical properties between dried or (as in life) hydrated states. On average baleen is 32.35% water by weight in North Atlantic right whales ( Eubalaena glacialis ) and 34.37% in bowhead whales ( Balaena mysticetus ). Baleen's wettability measured by water droplet contact angles shows that dried baleen is hydrophobic whereas hydrated baleen is highly hydrophilic. Three-point flexural bending tests of mechanical strength reveal th

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9

Leaper, Rebecca, and Cara Miller. "Management of Antarctic baleen whales amid past exploitation, current threats and complex marine ecosystems." Antarctic Science 23, no. 6 (2011): 503–29. http://dx.doi.org/10.1017/s0954102011000708.

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AbstractAs baleen whales recover from severe exploitation, they are probably subject to a wide variety of threats within the Antarctic marine ecosystem, including directed take. Here we review both the management and current status of Antarctic baleen whales and consider those threats likely to impact on them. Threats range from global problems - marine pollution and climate change - to localized issues including shipping, habitat disturbance, unregulated wildlife tourism and fishery activities. We identify the most pressing anthropogenic threats to baleen whales including scientific whaling a

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10

Panigada, S., M. Zanardelli, S. Canese, and M. Jahoda. "How deep can baleen whales dive?" Marine Ecology Progress Series 187 (1999): 309–11. http://dx.doi.org/10.3354/meps187309.

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11

Piatt, JF, and DA Methven. "Threshold foraging behavior of baleen whales." Marine Ecology Progress Series 84 (1992): 205–10. http://dx.doi.org/10.3354/meps084205.

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12

Thomas, Peter O., Randall R. Reeves, and Robert L. Brownell. "Status of the world's baleen whales." Marine Mammal Science 32, no. 2 (2015): 682–734. http://dx.doi.org/10.1111/mms.12281.

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13

Corkeron, Peter J., and Richard C. Connor. "WHY DO BALEEN WHALES MIGRATE?1." Marine Mammal Science 15, no. 4 (1999): 1228–45. http://dx.doi.org/10.1111/j.1748-7692.1999.tb00887.x.

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14

Jackson, Jeremy. "On the evolution of baleen whales." Science 360, no. 6384 (2018): 44.1–44. http://dx.doi.org/10.1126/science.360.6384.44-a.

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15

Stimpert, Alison K., David N. Wiley, Whitlow W. L. Au, Mark P. Johnson, and Roland Arsenault. "‘Megapclicks’: acoustic click trains and buzzes produced during night-time foraging of humpback whales ( Megaptera novaeangliae )." Biology Letters 3, no. 5 (2007): 467–70. http://dx.doi.org/10.1098/rsbl.2007.0281.

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Humpback whales ( Megaptera novaeangliae ) exhibit a variety of foraging behaviours, but neither they nor any baleen whale are known to produce broadband clicks in association with feeding, as do many odontocetes. We recorded underwater behaviour of humpback whales in a northwest Atlantic feeding area using suction-cup attached, multi-sensor, acoustic tags (DTAGs). Here we describe the first recordings of click production associated with underwater lunges from baleen whales. Recordings of over 34 000 ‘megapclicks’ from two whales indicated relatively low received levels at the tag (between 143

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16

Uchida, Mayuka, Ippei Suzuki, Keizo Ito, et al. "Estimation of the feeding record of pregnant Antarctic minke whales (Balaenoptera bonaerensis) using carbon and nitrogen stable isotope analysis of baleen plates." Polar Biology 44, no. 3 (2021): 621–29. http://dx.doi.org/10.1007/s00300-021-02816-5.

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AbstractAntarctic minke whales (Balaenoptera bonaerensis) are migratory capital breeders that experience intensive summer feeding on Antarctic krill (Euphausia superba) in the Southern Ocean and winter breeding at lower latitudes, but their prey outside of the Antarctic is unknown. Stable isotope analyses were conducted on δ13C and δ15N from the baleen plates of ten pregnant Antarctic minke whales to understand the growth rate of the baleen plate and their diet in lower latitudes. Two to three oscillations along the length of the edge of the baleen plate were observed in δ15N, and the annual g

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17

Rolland, Rosalind M., Susan E. Parks, Kathleen E. Hunt, et al. "Evidence that ship noise increases stress in right whales." Proceedings of the Royal Society B: Biological Sciences 279, no. 1737 (2012): 2363–68. http://dx.doi.org/10.1098/rspb.2011.2429.

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Baleen whales ( Mysticeti ) communicate using low-frequency acoustic signals. These long-wavelength sounds can be detected over hundreds of kilometres, potentially allowing contact over large distances. Low-frequency noise from large ships (20–200 Hz) overlaps acoustic signals used by baleen whales, and increased levels of underwater noise have been documented in areas with high shipping traffic. Reported responses of whales to increased noise include: habitat displacement, behavioural changes and alterations in the intensity, frequency and intervals of calls. However, it has been unclear whet

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18

Aguilar, Alex, and Asunción Borrell. "Growth of baleen along the baleen rack is constant in balaenopterid whales." Polar Biology 44, no. 6 (2021): 1223–25. http://dx.doi.org/10.1007/s00300-021-02877-6.

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19

Peredo, Carlos Mauricio, and Nicholas D. Pyenson. "Morphological variation of the relictual alveolar structures in the mandibles of baleen whales." PeerJ 9 (July 30, 2021): e11890. http://dx.doi.org/10.7717/peerj.11890.

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Living baleen whales (mysticetes) are bulk filter feeders that use keratinous baleen plates to filter food from prey laden water. Extant mysticetes are born entirely edentulous, though they possess tooth buds early in ontogeny, a trait inherited from toothed ancestors. The mandibles of extant baleen whales have neither teeth nor baleen; teeth are resorbed in utero and baleen grows only on the palate. The mandibles of extant baleen whales also preserve a series of foramina and associated sulci that collectively form an elongated trough, called the alveolar groove. Despite this name, it remains

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20

Gough, William T., Paolo S. Segre, K. C. Bierlich, et al. "Scaling of swimming performance in baleen whales." Journal of Experimental Biology 222, no. 20 (2019): jeb204172. http://dx.doi.org/10.1242/jeb.204172.

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21

Stimmelmayr, R., DS Rotstein, G. Sheffield, and JC George. "Subcutaneous, abdominal, and thoracic encapsulated fat necrosis in bowhead whales Balaena mysticetus from Alaska, USA." Diseases of Aquatic Organisms 145 (July 15, 2021): 159–64. http://dx.doi.org/10.3354/dao03605.

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We describe a case series of encapsulated fat necrosis with subcutaneous, abdominal, and thoracic locations in 7 subsistence-harvested bowhead whales Balaena mysticetus. Masses had a variably-dense fibrous capsule surrounding necrotic adipocytes and calcium salts (saponification). One animal also had prior concussive injury, pleural fibrosis, and hepatic lipoma; the other animals had no significant findings. The described condition is uncommon in bowhead whales, with 7/575 (1.2%) observed from 1996 to 2015. The exact mechanisms of development of encapsulated fat necrosis in bowhead whales rema

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22

Park, Travis, Alistair R. Evans, Stephen J. Gallagher, and Erich M. G. Fitzgerald. "Low-frequency hearing preceded the evolution of giant body size and filter feeding in baleen whales." Proceedings of the Royal Society B: Biological Sciences 284, no. 1848 (2017): 20162528. http://dx.doi.org/10.1098/rspb.2016.2528.

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Living baleen whales (mysticetes) produce and hear the lowest-frequency (infrasonic) sounds among mammals. There is currently debate over whether the ancestor of crown cetaceans (Neoceti) was able to detect low frequencies. However, the lack of information on the most archaic fossil mysticetes has prevented us from determining the earliest evolution of their extreme acoustic biology. Here, we report the first anatomical analyses and frequency range estimation of the inner ear in Oligocene (34–23 Ma) fossils of archaic toothed mysticetes from Australia and the USA. The cochlear anatomy of these

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23

Häussermann, Verena, Carolina S. Gutstein, Michael Beddington, et al. "Largest baleen whale mass mortality during strong El Niño event is likely related to harmful toxic algal bloom." PeerJ 5 (May 31, 2017): e3123. http://dx.doi.org/10.7717/peerj.3123.

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While large mass mortality events (MMEs) are well known for toothed whales, they have been rare in baleen whales due to their less gregarious behavior. Although in most cases the cause of mortality has not been conclusively identified, some baleen whale mortality events have been linked to bio-oceanographic conditions, such as harmful algal blooms (HABs). In Southern Chile, HABs can be triggered by the ocean–atmosphere phenomenon El Niño. The frequency of the strongest El Niño events is increasing due to climate change. In March 2015, by far the largest reported mass mortality of baleen whales

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24

Belikov, Stanislav E., and Andrei N. Boltunov. "Distribution and migrations of cetaceans in the Russian Arctic according to observations from aerial ice reconnaissance." NAMMCO Scientific Publications 4 (July 21, 2002): 69. http://dx.doi.org/10.7557/3.2838.

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This paper is based on 748 observations of belugas (Delphinapterus leucas) and 382 observations of baleen whales in the Russian Arctic, the majority of the data provided by aerial reconnaissance of sea ice (ARSI). Although the data are not suitable for the estimation of the number and density of the animals, they represent a multi-year (1958-1995) range of observations to update our knowledge on the seasonal distribution and migrations of the species. Belugas inhabit not only shelf waters but also the zone of the shelf slope and the abyssal zone of the Arctic Ocean, where the animals appear mo

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25

Hobson, Keith A., and Don M. Schell. "Stable carbon and nitrogen isotope patterns in baleen from eastern Arctic bowhead whales (Balaena mysticetus)." Canadian Journal of Fisheries and Aquatic Sciences 55, no. 12 (1998): 2601–7. http://dx.doi.org/10.1139/f98-142.

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Previous measurements of naturally occurring stable isotopes of carbon (delta13C) and nitrogen (delta15N) along the baleen plates of western Arctic bowhead whales (Balaena mysticetus) have provided a continuous lifetime record of the feeding or nutritional ecology of these animals that migrate annually between isotopically different foodwebs. However, virtually nothing was known about isotopic patterns of eastern Arctic bowheads. We measured delta13C and delta15N values along the baleen plates of three eastern and one western Arctic bowhead whales taken from Canadian waters in 1988 and 1996. I

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26

Hocking, David P., Felix G. Marx, Erich M. G. Fitzgerald, and Alistair R. Evans. "Ancient whales did not filter feed with their teeth." Biology Letters 13, no. 8 (2017): 20170348. http://dx.doi.org/10.1098/rsbl.2017.0348.

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The origin of baleen whales (Mysticeti), the largest animals on Earth, is closely tied to their signature filter-feeding strategy. Unlike their modern relatives, archaic whales possessed a well-developed, heterodont adult dentition. How these teeth were used, and what role their function and subsequent loss played in the emergence of filter feeding, is an enduring mystery. In particular, it has been suggested that elaborate tooth crowns may have enabled stem mysticetes to filter with their postcanine teeth in a manner analogous to living crabeater and leopard seals, thereby facilitating the tr

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27

Kahane-Rapport, S. R., M. S. Savoca, D. E. Cade, et al. "Lunge filter feeding biomechanics constrain rorqual foraging ecology across scale." Journal of Experimental Biology 223, no. 20 (2020): jeb224196. http://dx.doi.org/10.1242/jeb.224196.

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ABSTRACTFundamental scaling relationships influence the physiology of vital rates, which in turn shape the ecology and evolution of organisms. For diving mammals, benefits conferred by large body size include reduced transport costs and enhanced breath-holding capacity, thereby increasing overall foraging efficiency. Rorqual whales feed by engulfing a large mass of prey-laden water at high speed and filtering it through baleen plates. However, as engulfment capacity increases with body length (engulfment volume∝body length3.57), the surface area of the baleen filter does not increase proportio

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28

Marshall, Michael. "Antarctic freeze paved the way for baleen whales." New Scientist 218, no. 2914 (2013): 15. http://dx.doi.org/10.1016/s0262-4079(13)61036-2.

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29

FORD, JOHN K. B., and RANDALL R. REEVES. "Fight or flight: antipredator strategies of baleen whales." Mammal Review 38, no. 1 (2008): 50–86. http://dx.doi.org/10.1111/j.1365-2907.2008.00118.x.

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30

Berchok, Catherine L., Gerald L. D’Spain, and John A. Hildebrand. "Tracking baleen whales using the relative relocation method." Journal of the Acoustical Society of America 122, no. 5 (2007): 3003. http://dx.doi.org/10.1121/1.2942720.

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31

Fitzgerald, Erich M. G. "Archaeocete-like jaws in a baleen whale." Biology Letters 8, no. 1 (2011): 94–96. http://dx.doi.org/10.1098/rsbl.2011.0690.

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The titanic baleen whales (Cetacea, Mysticeti) have a bizarre skull morphology, including an elastic mandibular symphysis, which permits dynamic oral cavity expansion during bulk feeding. How this key innovation evolved from the sutured symphysis of archaeocetes has remained unclear. Now, mandibles of the Oligocene toothed mysticete Janjucetus hunderi show that basal mysticetes had an archaeocete-like sutured symphysis. This archaic morphology was paired with a wide rostrum typical of later-diverging baleen whales. This demonstrates that increased oral capacity via rostral widening preceded th

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32

Kjeld, M. "Salt and water balance of modern baleen whales: rate of urine production and food intake." Canadian Journal of Zoology 81, no. 4 (2003): 606–16. http://dx.doi.org/10.1139/z03-041.

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Whales, as pelagic marine mammals, are thought to have evolved from fresh-water-dependent terrestrial mammals. Baleen whales feed primarily on salty euphausiids (krill) and have no access to fresh water. How have these mammals adapted to lifelong habitation in a hyperosmotic medium? A new approach is proposed for studying this by using allometry (scaling) of endogenous creatinine clearance in mammals together with determinations of creatinine concentration in fresh postmortem blood and urine of fin whales (Balaenoptera physalus) and sei whales (Balaenoptera borealis). From the predicted mean c

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33

McAlpine, Donald F. "Size and growth of heart, liver, and kidneys in North Atlantic fin (Balaenoptera physalus), sei (B. borealis), and sperm (Physeter macrocephalus) whales." Canadian Journal of Zoology 63, no. 6 (1985): 1402–9. http://dx.doi.org/10.1139/z85-210.

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Size and growth of heart, liver, and kidneys in fin (Balaenoptera physalus), sei (B. borealis), and sperm (Physeter macrocephalus) whales taken commercially off Iceland during the 1980 season are compared and examined relative to organ weights for terrestrial mammals. In agreement with the work of previous investigators, the sperm whale is shown to have a relatively smaller heart. However, contrary to previous analysis, fin and sei whales are shown to have relative heart sizes not radically different from those of terrestrial mammals. It is suggested that the differences in relative heart size

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34

Werth, Alexander J., Diego Rita, Michael V. Rosario, Michael J. Moore, and Todd L. Sformo. "How do baleen whales stow their filter? A comparative biomechanical analysis of baleen bending." Journal of Experimental Biology 221, no. 23 (2018): jeb189233. http://dx.doi.org/10.1242/jeb.189233.

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35

Shadwick, Robert E., Jean Potvin, and Jeremy A. Goldbogen. "Lunge Feeding in Rorqual Whales." Physiology 34, no. 6 (2019): 409–18. http://dx.doi.org/10.1152/physiol.00010.2019.

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The largest animals are baleen filter feeders that exploit large aggregations of small-bodied plankton. Although this feeding mechanism has evolved multiple times in marine vertebrates, rorqual whales exhibit a distinct lunge filter feeding mode that requires extreme physiological adaptations—most of which remain poorly understood. Here, we review the biomechanics of the lunge feeding mechanism in rorqual whales that underlies their extraordinary foraging performance and gigantic body size.

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36

Werth, Alexander J. "Hydrodynamic and Sensory Factors Governing Response of Copepods to Simulated Predation by Balaenid Whales." International Journal of Ecology 2012 (2012): 1–13. http://dx.doi.org/10.1155/2012/208913.

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Predator/prey interactions between copepods and balaenid (bowhead and right) whales were studied with controlled lab experiments using moving baleen in still water and motionless baleen in flowing water to simulate zooplankton passage toward, into, and through the balaenid oral cavity. Copepods showed a lesser escape response to baleen and to a model head simulating balaenid oral hydrodynamics than to other objects. Copepod escape response increased as water flow and body size increased and was greatest at distances ≥10 cm from baleen and at copepod density = 10,000 m−3. Data from light/dark e

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37

Di Iorio, Lucia, and Christopher W. Clark. "Exposure to seismic survey alters blue whale acoustic communication." Biology Letters 6, no. 1 (2009): 51–54. http://dx.doi.org/10.1098/rsbl.2009.0651.

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The ability to perceive biologically important sounds is critical to marine mammals, and acoustic disturbance through human-generated noise can interfere with their natural functions. Sounds from seismic surveys are intense and have peak frequency bands overlapping those used by baleen whales, but evidence of interference with baleen whale acoustic communication is sparse. Here we investigated whether blue whales ( Balaenoptera musculus ) changed their vocal behaviour during a seismic survey that deployed a low-medium power technology (sparker). We found that blue whales called consistently mo

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38

Friedlaender, Ari S., David W. Johnston, Reny B. Tyson, et al. "Multiple-stage decisions in a marine central-place forager." Royal Society Open Science 3, no. 5 (2016): 160043. http://dx.doi.org/10.1098/rsos.160043.

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Air-breathing marine animals face a complex set of physical challenges associated with diving that affect the decisions of how to optimize feeding. Baleen whales (Mysticeti) have evolved bulk-filter feeding mechanisms to efficiently feed on dense prey patches. Baleen whales are central place foragers where oxygen at the surface represents the central place and depth acts as the distance to prey. Although hypothesized that baleen whales will target the densest prey patches anywhere in the water column, how depth and density interact to influence foraging behaviour is poorly understood. We used

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39

Moore, Sue E. "Is it ‘boom times’ for baleen whales in the Pacific Arctic region?" Biology Letters 12, no. 9 (2016): 20160251. http://dx.doi.org/10.1098/rsbl.2016.0251.

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The marine ecosystem in the Pacific Arctic region has experienced dramatic transformation, most obvious by the loss of sea ice volume (75%), late-summer areal extent (50%) and change in phenology (four to six weeks longer open-water period). This alteration has resulted in an opening of habitat for subarctic species of baleen whales, many of which are recovering in number from severe depletions from commercial whaling in the nineteenth and twentieth centuries. Specifically, humpback, fin and minke whales ( Megaptera novaeangliae , Balaenoptera physalus and Balaenoptera acutorostrata ) are now

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40

OHSUMI, SEIJI, and TSUTOMU TAMURA. "Dietary studies on baleen whales in the North Pacific." Fisheries science 68, sup1 (2002): 260–63. http://dx.doi.org/10.2331/fishsci.68.sup1_260.

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41

Clark, Christopher W., and William T. Ellison. "Bioacoustics of baleen whales: From infrasonics to complex songs." Journal of the Acoustical Society of America 94, no. 3 (1993): 1830. http://dx.doi.org/10.1121/1.407770.

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42

Piatt, John F., David A. Methven, Alan E. Burger, Ruth L. McLagan, Vicki Mercer, and Elizabeth Creelman. "Baleen whales and their prey in a coastal environment." Canadian Journal of Zoology 67, no. 6 (1989): 1523–30. http://dx.doi.org/10.1139/z89-217.

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Patterns of abundance of humpback (Megaptera novaeangliae), fin (Balaenoptera physalus), and minke (Balaenoptera acutorostrata) whales are described in relation to the abundance of their primary prey, capelin (Mallotus villosus), during 1982–1985 at Witless Bay, Newfoundland. The abundance ratio of the three whale species was 10:1:3.5, respectively. Abundance of all whale species was strongly correlated with abundance of capelin through each season and between years. Capelin abundance accounted for 63% of the variation in whale numbers in 1983 and 1984, while environmental parameters (e.g., wa

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43

YAMATO, MAYA, DARLENE R. KETTEN, JULIE ARRUDA, and SCOTT CRAMER. "BIOMECHANICAL AND STRUCTURAL MODELING OF HEARING IN BALEEN WHALES." Bioacoustics 17, no. 1-3 (2008): 100–102. http://dx.doi.org/10.1080/09524622.2008.9753781.

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44

Peredo, Carlos Mauricio, Nicholas D. Pyenson, Christopher D. Marshall, and Mark D. Uhen. "Tooth Loss Precedes the Origin of Baleen in Whales." Current Biology 28, no. 24 (2018): 3992–4000. http://dx.doi.org/10.1016/j.cub.2018.10.047.

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45

Witting, Lars. "Selection-delayed population dynamics in baleen whales and beyond." Population Ecology 55, no. 2 (2013): 377–401. http://dx.doi.org/10.1007/s10144-013-0370-9.

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46

Best, P. "Increase rates in severely depleted stocks of baleen whales." ICES Journal of Marine Science 50, no. 2 (1993): 169–86. http://dx.doi.org/10.1006/jmsc.1993.1018.

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47

Wray, Janie, Eric Keen, and Éadin N. O’Mahony. "Social survival: Humpback whales (Megaptera novaeangliae) use social structure to partition ecological niches within proposed critical habitat." PLOS ONE 16, no. 6 (2021): e0245409. http://dx.doi.org/10.1371/journal.pone.0245409.

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Animal culture and social bonds are relevant to wildlife conservation because they influence patterns of geography, behavior, and strategies of survival. Numerous examples of socially-driven habitat partitioning and ecological-niche specialization can be found among vertebrates, including toothed whales. But such social-ecological dynamics, described here as ‘social niche partitioning’, are not known among baleen whales, whose societies—particularly on foraging grounds—are largely perceived as unstructured and incidental to matters of habitat use and conservation. However, through 16 years of

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Werth, Alexander J., Shemar M. Blakeney, and Adrian I. Cothren. "Oil adsorption does not structurally or functionally alter whale baleen." Royal Society Open Science 6, no. 5 (2019): 182194. http://dx.doi.org/10.1098/rsos.182194.

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Mysticete whales filter small prey from seawater using baleen, a unique keratinous oral tissue that grows from the palate, from which it hangs in hundreds of serial plates. Laboratory experiments testing effects of oils on material strength and flexibility, particle capture and tissue architecture of baleen from four mysticete species (bowhead, Balaena mysticetus ; North Atlantic right, Eubalaena glacialis ; fin, Balaenoptera physalus ; humpback, Megaptera novaeangliae ) indicate that baleen is hydrophilic and oleophobic, shedding rather than adsorbing oil. Oils of different weights and viscos

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Shipps, B. K., Carlos Mauricio Peredo, and Nicholas D. Pyenson. "Borealodon osedax , a new stem mysticete (Mammalia, Cetacea) from the Oligocene of Washington State and its implications for fossil whale-fall communities." Royal Society Open Science 6, no. 7 (2019): 182168. http://dx.doi.org/10.1098/rsos.182168.

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Baleen whales (mysticetes) lack teeth as adults and instead filter feed using keratinous baleen plates. They do not echolocate with ultrasonic frequencies like toothed whales but are instead known for infrasonic acoustics. Both baleen and infrasonic hearing are separately considered key innovations linked to their gigantism, evolutionary success and ecological diversity. The earliest mysticetes had teeth, and the phylogenetic position of many so-called toothed mysticetes remains debated, including those belonging to the nominal taxonomic groups Llanocetidae, Mammalodontidae and Aetiocetidae. H

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Goldbogen, Jeremy A., Brandon L. Southall, Stacy L. DeRuiter, et al. "Blue whales respond to simulated mid-frequency military sonar." Proceedings of the Royal Society B: Biological Sciences 280, no. 1765 (2013): 20130657. http://dx.doi.org/10.1098/rspb.2013.0657.

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Mid-frequency military (1–10 kHz) sonars have been associated with lethal mass strandings of deep-diving toothed whales, but the effects on endangered baleen whale species are virtually unknown. Here, we used controlled exposure experiments with simulated military sonar and other mid-frequency sounds to measure behavioural responses of tagged blue whales ( Balaenoptera musculus ) in feeding areas within the Southern California Bight. Despite using source levels orders of magnitude below some operational military systems, our results demonstrate that mid-frequency sound can significantly affect

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