SMALL CETACEANS, BIG PROBLEMS a Global Review of the Impacts of Hunting on Small Whales, Dolphins and Porpoises
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Pathological Findings in Cetaceans Sporadically Stranded Along the Chilean Coast
fmars-07-00684 August 19, 2020 Time: 20:19 # 1 BRIEF RESEARCH REPORT published: 21 August 2020 doi: 10.3389/fmars.2020.00684 Pathological Findings in Cetaceans Sporadically Stranded Along the Chilean Coast Mario Alvarado-Rybak1,2, Frederick Toro3, Paulette Abarca4, Enrique Paredes5, Sonia Español-Jiménez6 and Mauricio Seguel7,8* 1 Sustainability Research Centre, Faculty of Life Sciences, Universidad Andrés Bello, Santiago, Chile, 2 School of Veterinary Medicine, Pontifical Catholic University of Chile, Santiago, Chile, 3 Escuela de Medicina Veterinaria, Facultad de Recursos Naturales y Medicina Veterinaria, Universidad Santo Tomás, Viña del Mar, Chile, 4 Programa de Magíster en Ciencias, Mención Biodiversidad y Conservación, Universidad de Valparaíso, Valparaíso, Chile, 5 Instituto de Patologia Animal, Facultad de Ciencias Veterinarias, Universidad Austral de Chile, Valdivia, Chile, 6 Melimoyu Ecosystem Research Institute, Santiago, Chile, 7 Odum School of Ecology, University of Georgia, Athens, GA, United States, 8 Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada Chile has one of the largest coastlines in the world with at least 50% of the world cetacean species occurring within its jurisdictional waters. However, little is known regarding the health status and main causes of death in cetaceans off continental Chile. In this report, we summarize the major pathological findings and most likely Edited by: causes of death of 15 cetaceans stranded along the Chilean coast between 2010 Stephen Raverty, and 2019. Drowning, due to fishing gear entanglement, was the most likely cause of Animal Health Center, Canada death in 3 Burmeister’s porpoises (Phocoena spinipinnis), a Risso’s dolphin (Grampus Reviewed by: griseus) and a short-beaked common dolphin (Delphinus delphis). -
Identifying Sexually Mature, Male Short-Beaked Common Dolphins (Delphinus Delphis) at Sea, Based on the Presence of a Postanal Hump
Aquatic Mammals 2002, 28.2, 181–187 Identifying sexually mature, male short-beaked common dolphins (Delphinus delphis) at sea, based on the presence of a postanal hump Dirk R. Neumann1, Kirsty Russell2, Mark B. Orams1, C. Scott Baker2, and Padraig Duignan3 1Coastal Marine Research Group, Massey University, Auckland, New Zealand 2Department of Biology, University of Auckland, New Zealand 3Department of Veterinary Science, Massey University, Palmerston North, New Zealand Abstract Introduction For detailed studies on the behaviour and social To fully comprehend the behaviour and social organization of a species, it is important to organization of a species, it is necessary to distinguish males and females. Many delphinid distinguish males and females. Long-term studies species show little sexual dimorphism. However, in of bottlenose dolphins (Tursiops truncatus, T. mature male spinner dolphins, Stenella longirostris aduncus), which tracked focal individuals of known (Perrin & Gilpatrick, 1994) and Fraser’s dolphins, sex, revealed sexual segregation of mature males Lagenodelphis hosei (Jefferson et al., 1997), tissue from females (Wells, 1991), the formation of male between the anus and the flukes forms a so-called coalitions (Wells, 1991; Connor et al., 1992), and peduncle keel, or postanal hump. We discovered an differences in the activity budgets of males and analogous feature in free-ranging short-beaked females (Waples et al., 1998). Many delphinid common dolphins, Delphinus delphis,offthe species show little sexual dimorphism, which makes north-eastern coast of New Zealand’s North Island. it exceedingly difficult to sex individuals at sea. For Genetic analysis of skin samples obtained from many species, the only individuals that can be sexed bow-riding individuals revealed that dolphins without capture are those that are consistently with a postanal hump were indeed always male. -
Morphology and Distribution of the Spinner Dolphin, Stenella
J. CETACEAN RES. MANAGE. 1(2):167- 177 , 1999 167 Morphology and distribution of the spinner dolphin,Stenella longirostris, rough-toothed dolphin,Steno bredanensis and melon-headed whale,Peponocephala electra, from waters off the Sultanate of Oman1 Koen Van W aerebeek*, M ichael G allagheri Robert Baldwin Vassili Papastavrou§ and Samira M ustafa A l - L a w a t i 1 Contact e-mail: [email protected] ABSTRACT The morphology of three tropical delphinids from the Sultanate of Oman and their occurrence in the Arabian Sea are presented. Body lengths of four physically mature spinner dolphins (three males) ranged from 154-178.3cm (median 164.5cm), i.e. smaller than any known stock of spinner dolphins, except the dwarf forms from Thailand and Australia. Skulls of Oman spinner dolphins (n = 10) were practically indistinguishable from those of eastern spinner dolphins ( Stenella longirostris orientalis) from the eastern tropical Pacific, but were considerably smaller than skulls of populations of pantropical ( Stenella longirostris longirostris) and Central American spinner dolphins (Stenella longirostris centroamericana). Two colour morphs (CM) were observed. The most common (CM1) has the typical tripartite pattem of the pantropical spinner dolphin. A small morph (CM2), so far seen mostly off Muscat, is characterised by a dark dorsal overlay obscuring most of the tripartite pattern and by a pinkish or white ventral field and supragenital patch. Two skulls were linked to a CM1 colour morph, the others were undetermined. It is concluded that Oman spinner dolphins should be treated as a discrete population, morphologically distinct from all known spinner dolphin subspecies. -
Marine Mammals of Hudson Strait the Following Marine Mammals Are Common to Hudson Strait, However, Other Species May Also Be Seen
Marine Mammals of Hudson Strait The following marine mammals are common to Hudson Strait, however, other species may also be seen. It’s possible for marine mammals to venture outside of their common habitats and may be seen elsewhere. Bowhead Whale Length: 13-19 m Appearance: Stocky, with large head. Blue-black body with white markings on the chin, belly and just forward of the tail. No dorsal fin or ridge. Two blow holes, no teeth, has baleen. Behaviour: Blow is V-shaped and bushy, reaching 6 m in height. Often alone but sometimes in groups of 2-10. Habitat: Leads and cracks in pack ice during winter and in open water during summer. Status: Special concern Beluga Whale Length: 4-5 m Appearance: Adults are almost entirely white with a tough dorsal ridge and no dorsal fin. Young are grey. Behaviour: Blow is low and hardly visible. Not much of the body is visible out of the water. Found in small groups, but sometimes hundreds to thousands during annual migrations. Habitat: Found in open water year-round. Prefer shallow coastal water during summer and water near pack ice in winter. Killer Whale Status: Endangered Length: 8-9 m Appearance: Black body with white throat, belly and underside and white spot behind eye. Triangular dorsal fin in the middle of the back. Male dorsal fin can be up to 2 m in high. Behaviour: Blow is tall and column shaped; approximately 4 m in height. Narwhal Typically form groups of 2-25. Length: 4-5 m Habitat: Coastal water and open seas, often in water less than 200 m depth. -
Anomalously Pigmented Common Dolphins (Delphinus Sp.) Off Northern New Zealand Karen A
Aquatic Mammals 2005, 31(1), 43-51, DOI 10.1578/AM.31.1.2005.43 Anomalously Pigmented Common Dolphins (Delphinus sp.) off Northern New Zealand Karen A. Stockin1 and Ingrid N. Visser2 1Coastal-Marine Research Group, Institute of Natural Resources, Massey University, Private Bag 102 904, North Shore MSC, Auckland, New Zealand 2Orca Research Trust, P.O. Box 1233, Whangarei, New Zealand Abstract New Zealand waters is provided by Bernal et al. (2003) who suggested that common dolphins exhib- Anomalous pigmentations have been recorded in iting long rostra, as photographed in New Zealand many cetacean species. However, typically only by Doak (1989; Plates 34A, 34B), are long-beaked one variation is reported from a population at common dolphins. However, as Amaha (1994) and a time (e.g., an albino). Here we record a spec- Jefferson & Van Waerebeek (2002) highlighted, trum of pigmentation from common dolphins neither New Zealand nor Australian common dol- (Delphinus sp.) off northern New Zealand. All- phins neatly fit the morphological description of black, dark-morph, pale-morph, and all-white either D. delphis or D. capensis. In the past, New individuals, as well as variations between these Zealand common dolphins have been identified have been recorded. Pale-coloured pectoral flip- from pigmentation patterns in the field and classi- pers are prevalent, and a number of individuals fied as short-beaked common dolphins (Bräger & with white “helmets” have been observed. Schneider, 1998; Gaskin, 1968; Neumann, 2001; Webb, 1973), although pigmentation alone may not Key Words: common dolphin, Delphinus delphis, be sufficient to positively identity these dolphins to Delphinus capensis, anomalous pigmentation, species. -
List of Marine Mammal Species and Subspecies Written by The
List of Marine Mammal Species and Subspecies Written by the Committee on Taxonomy The Ad-Hoc Committee on Taxonomy , chaired by Bill Perrin, has produced the first official SMM list of marine mammal species and subspecies. Consensus on some issues was not possible; this is reflected in the footnotes. This list will be revisited and possibly revised every few months reflecting the continuing flux in marine mammal taxonomy. This list can be cited as follows: “Committee on Taxonomy. 2009. List of marine mammal species and subspecies. Society for Marine Mammalogy, www.marinemammalscience.org, consulted on [date].” This list includes living and recently extinct species and subspecies. It is meant to reflect prevailing usage and recent revisions published in the peer-reviewed literature. Author(s) and year of description of the species follow the Latin species name; when these are enclosed in parentheses, the species was originally described in a different genus. Classification and scientific names follow Rice (1998), with adjustments reflecting more recent literature. Common names are arbitrary and change with time and place; one or two currently frequently used in English and/or a range language are given here. Additional English common names and common names in French, Spanish, Russian and other languages are available at www.marinespecies.org/cetacea/ . The cetaceans genetically and morphologically fall firmly within the artiodactyl clade (Geisler and Uhen, 2005), and therefore we include them in the order Cetartiodactyla, with Cetacea, Mysticeti and Odontoceti as unranked taxa (recognizing that the classification within Cetartiodactyla remains partially unresolved -- e.g., see Spaulding et al ., 2009) 1. -
Encyclopedia of Marine Mammals, Second Edition
1188 Tucuxi and Guiana Dolphin continues to grow and in the United States, public support stands Chance , P. ( 1994 ). “ Learning and Behavior , ” 3rd Ed. Brooks/Cole fi rmly behind both the MMPA and marine mammal facilities. More Publishing Company , Belmont . people are now enjoying the benefi ts of new and exciting training Cole , K. C. , Van Tilburg , D. , BurchVernon , A. , and Riccio , D. C. ( 1996). programs, shows, presentations, interaction opportunities, and scien- The importance of context in the US preexposure effect in CTA: Novel tifi c discoveries, all facilitated through behavior management. versus latently inhibited contextual stimuli . Lear. Motiv. 27 , 362 – 374 . Domjan , M. ( 1993 ). “ The Principles of Learning and Behavior , ” 3rd Ed. By maintaining a healthy captive population of various marine Brooks/Cole Publishing Company , Belmont . mammal species, comparative data are generated to assist in under- Honig , W. K. , and Staddon , J. E. R. ( 1977 ). “ The Handbook of Operant standing wild animals, and these facilities continue to give material Behavior . ” Prentice-Hall, Inc , Englewood Cliffs . support to important research and conservation initiatives. In addi- Kazdin , A. E. ( 1994 ). “ Behavior Modifi cation in Applied Settings , ” 5th tion, these facilities act as part of the Marine Mammal Stranding Ed. Brooks/Cole Publishing Company , Belmont . Network, assisting NOAA/NMFS in the rescue, housing, and care Marine Mammal Permits and Authorizations. (2006). [Accessed online of stranded wild animals where expertise in medical care can be July 5, 2007]. Available from World Wide Web: http://www.nmfs. applied. These facilities also develop animal management and hus- noaa.gov/pr/permits/mmpa_permits.htm bandry skills in staff members who are also able to assist in health Marine Mammal Poll. -
List of Marine Mammal Species and Subspecies
List of Marine Mammal Species and Subspecies Introduction The Committee on Taxonomy, chaired by Patricia Rosel, produced the first official Society for Marine Mammalogy list of marine mammal species and subspecies in 2010. Consensus on some issues has not been possible; this is reflected in the footnotes. The list is updated at least annually. The current version was updated in May 2020. This list can be cited as follows: “Committee on Taxonomy. 2019. List of marine mammal species and subspecies. Society for Marine Mammalogy, www.marinemammalscience.org, consulted on [date].” This list includes living and recently extinct (within historical times) species and subspecies. It is meant to reflect prevailing usage and recent revisions published in the peer-reviewed literature. Classification and scientific names follow Rice (1998), with adjustments reflecting more recent literature. Author(s) and year of description of each taxon follow the Latin (scientific) species name; when these are enclosed in parentheses, the taxon was originally described in a different genus. The Committee annually considers and evaluates new, peer-reviewed literature that proposes taxonomic changes. The Committee’s focus is on alpha taxonomy (describing and naming taxa) and beta taxonomy primarily at lower levels of the hierarchy (subspecies, species and genera), although it may evaluate issues at higher levels if deemed necessary. Proposals for new, taxonomically distinct taxa require a formal, peer-reviewed study and should provide robust evidence that some subspecies or species criterion was met. For review of species concepts, see Reeves et al. (2004), Orr and Coyne (2004), de Queiroz (2007), Perrin (2009) and Taylor et al. -
Sustained Disruption of Narwhal Habitat Use and Behavior in The
Sustained disruption of narwhal habitat use and behavior in the presence of Arctic killer whales Greg A. Breeda,1, Cory J. D. Matthewsb, Marianne Marcouxb, Jeff W. Higdonc, Bernard LeBlancd, Stephen D. Petersene, Jack Orrb, Natalie R. Reinhartf, and Steven H. Fergusonb aInstitute of Arctic Biology, University of Alaska, Fairbanks, AK 99775; bArctic Aquatic Research Division, Fisheries and Oceans Canada, Winnipeg, MB, Canada R3T 2N6; cHigdon Wildlife Consulting, Winnipeg, MB, Canada R3G 3C9; dFisheries Management, Fisheries and Oceans Canada, Quebec, QC, Canada G1K 7Y7; eAssiniboine Park Zoo, Winnipeg, MB, Canada R3R 0B8; and fDepartment of Biological Sciences, University of Manitoba, Winnipeg, MB, Canada R3T 2N2 Edited by James A. Estes, University of California, Santa Cruz, CA, and approved January 10, 2017 (received for review July 17, 2016) Although predators influence behavior of prey, analyses of elec- Electronic tracking tags are also frequently used to track verte- tronic tracking data in marine environments rarely consider how brates in marine systems. Although there is evidence that marine predators affect the behavior of tracked animals. We collected animals adjust their behavior under predation threat (21, 22, 12), an unprecedented dataset by synchronously tracking predator few data or analyses exist showing how predators affect the (killer whales, N = 1; representing a family group) and prey movement of tracked marine animals. These data are lacking (narwhal, N = 7) via satellite telemetry in Admiralty Inlet, a because marine environments are more difficult to observe and large fjord in the Eastern Canadian Arctic. Analyzing the move- tracked animals often move over scales much larger than their ment data with a switching-state space model and a series of terrestrial counterparts, making it difficult to measure predator mixed effects models, we show that the presence of killer whales density in situations where tracking tags are deployed on prey. -
EXTERNAL FEATURES of the DUSKY DOLPHIN Lagenorhynchus Obscurus (GRAY, 1828) from PERUVIAN WATERS Caracteristicas EXTERNAS DEL DE
Estud. Oceanol. 12: 37-53 1993 ISSN CL 0O71-173X EXTERNAL FEATURES OF THE DUSKY DOLPHIN Lagenorhynchus obscurus (GRAY, 1828) FROM PERUVIAN WATERS CARACTERisTICAS EXTERNAS DEL DELFiN OSCURO Lagenorhynchus obscurus (GRAY, 1828) DE AGUAS PERUANAS Koen Van Waerebeek Centro Peruano de Estudios Cetol6gicos (CEPEC), Asociaci6n de Ecologfa y Conservaci6n, Casilla 1536, Lima 18, Peru ABSTRACT Individual, sexual and developmental variation is quantified in the external morphology and colouration of the dusky dolphin Lagenorhynchus obscurus from Peruvian coastal waters. No significant difference in body length between sexes is found{p = 0.09) and, generally, little sexual dimorphism is present. However, males have a more anteriorly positioned genital slit and anus and their dorsal fin is more curved, has a broader base and a greater surface area than females Although the dorsal fin apparently serves as a secondary sexual character, the use of it for sexing free-ranging dusky dolphins is discouraged because of high overlap in values Relative growth in 25 body measurements is characterized for both sexes by multiplicative regression equations. The colouration pattern of the dorsal fin, flank patch, thoracic field, flipper stripe and possibly (x2, p = 008) the eye patch, are independent of maturity status. Flipper blaze and lower lip patch are less pigmented in juveniles than in adults No sexual dimorphism is found in the colour pattern The existence of a discrete "Fitzroy" colour form can not be confirmed from available data. Various cases of anomalous, piebald pigmentation are described, probably equivalent to so-called partial albinism Adult dusky dolphins from both SW Africa and New Zealand are 8-10 cm shorter than Peruvian specimens, supporting conclusions of separate populations from a recent skull variability study. -
Dolphin and Orca Behaviour Studies and Individual Identification
Dolphin and orca behaviour studies and individual identification Blue Marine Foundation and Patagonia Projects Project overview - June 2020 1 BLUE MARINE FOUNDATION AND PATAGONIA PROJECTS DOLPHIN AND ORCA BEHAVIOUR AND INDIVIDUAL IDENTIFICATION 2 Dolphin and orca behaviour studies and individual identification Headlines • Toothed whales include dolphins, whales and belugas. • Chile has an endemic dolphin species, the Chilean dolphin (Cephalorhynchus eutropia), and there are thought to be less than 5000 left in the wild. • Each dolphin or orca has a unique pattern of notches and marks on their dorsal fins. • Patagonia Projects started their orca ID catalogue in 2018 and have 14 individuals documented. • The ability to identify individuals allows site fidelity to be studied: which species live in the Golfo de Penas, and how often do they return to the area? Story Very little is known about which odontocete species – toothed whales – frequent the waters of Chilean Patagonia around the Golfo de Penas. In addition, there are past observations of orca hunting sei whales (to the point where they strand on beaches and die) in this area. This prompted the Patagonia Projects team to more closely investigate and document orca behaviour, as well as any other dolphin species encountered. In November 2018, Patagonia Projects collaborated with Dr Isabella Clegg and set up a protocol for on-effort sightings, recording cetacean behaviour and taking photoID data. The aim was to better understand which cetaceans inhabit the area, whether they are residents and whether there is high site fidelity (do they return each year?), and what they are using the area for. -
FC Inshore Cetacean Species Identification
Falklands Conservation PO BOX 26, Falkland Islands, FIQQ 1ZZ +500 22247 [email protected] www.falklandsconservation.com FC Inshore Cetacean Species Identification Introduction This guide outlines the key features that can be used to distinguish between the six most common cetacean species that inhabit Falklands' waters. A number of additional cetacean species may occasionally be seen in coastal waters, for example the fin whale (Balaenoptera physalus), the humpback whale (Megaptera novaeangliae), the long-finned pilot whale (Globicephala melas) and the dusky dolphin (Lagenorhynchus obscurus). A full list of the species that have been documented to date around the Falklands can be found in Appendix 1. Note that many of these are typical of deeper, oceanic waters, and are unlikely to be encountered along the coast. The six species (or seven species, including two species of minke whale) described in this document are observed regularly in shallow, nearshore waters, and are the focus of this identification guide. Questions and further information For any questions about species identification then please contact the Cetaceans Project Officer Caroline Weir who will be happy to help you try and identify your sighting: Tel: 22247 Email: [email protected] Useful identification guides If you wish to learn more about the identification features of various species, some comprehensive field guides (which include all cetacean species globally) include: Handbook of Whales, Dolphins and Porpoises by Mark Carwardine. 2019. Marine Mammals of the World: A Comprehensive Guide to Their Identification by Thomas A. Jefferson, Marc A. Webber, and Robert L. Pitman. 2015. Whales, Dolphins and Seals: A Field Guide to the Marine Mammals of the World by Hadoram Shirihai and Brett Jarrett.