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Vertebral Column Malformations in New Zealand Delphinids with a Review of Cases World Wide

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Vertebral Column Malformations in New Zealand Delphinids with a Review of Cases World Wide Aquatic Mammals 2000, 26.1, 17–25 Vertebral column malformations in New Zealand delphinids with a review of cases world wide J. Berghan1 and I. N. Visser2 1117 Te Haumi Drive, Paihia, Bay of Islands, Northland, New Zealand 2The Orca Project, ‘Aorangi’, Matapouri Road, R.D 3, Whangarei, Northland, New Zealand Abstract Tursiops truncatus, Alexander et al., 1989; white- beaked dolphin, Lagenorhynchus albirostris, Few detailed reports of vertebral column malfor- Kompanje, 1995b; Risso’s dolphin, Grampus mations in cetaceans have been published. This griseus, Nutman & Kirk, 1988; Bortolotto, 1996; manuscript documents vertebral column malfor- and tucuxi, Sotalia fluviatilis, Fragoso, 1998). mation in ten wild delphinids (six bottlenose dol- Beyond these examples, the majority of accounts phins, two killer whales, and two Hector’s dolphins) are primarily anecdotal (bottlenose dolphin, Lilley, sighted in New Zealand waters. Three cases show 1962; Williams, 1992; Wells & Scott, 1997; Wilson scoliosis, three show kyphoscoliosis, two show et al., 1997; common dolphin, Delphinus delphis, kyphosis, one shows lordosis, and one case shows a Clokie & Kobus, 1990; Hector’s dolphin, Cephalo- slight lateral malformation. Previously documented rhynchus hectori, Dawson & Slooten, 1996; beluga cases of vertebral column malformations in ceta- whale, Delphinapterus leucas, Johnston & McCrea, ceans are listed, and further unpublished reports 1992; sperm whale, Physeter macrocephalus, Berzin, from around the world are presented in a table. The 1971; humpback whale, Megaptera novaeangliae, pathogenesis of vertebral column malformations in Osmond & Kaufman, 1998; and a fin whale fetus, cetaceans are discussed. Balaenoptera physalus, Slijper, 1949). Key words: vertebral column malformation, scolio- sis, kyphosis, kyphoscoliosis, lordosis, bottlenose Materials and Methods dolphin, killer whale, Hector’s dolphin. We report on six bottlenose dolphins, two Hector’s dolphins, and two killer whales, Orcinus orca, Introduction sighted in New Zealand waters, each showing visu- ally detectable attributes of mild to severe vertebral Anatomical malformation can be defined as any column malformation. Data and photographs were deviation from normal formation, and has varying collected opportunistically over a 6-yr period degrees of prominence. Malformation of the ver- (1994–1999), during the course of other field work. tebral column may be outwardly conspicuous in the In addition, we list unpublished reports of similarly form of scoliosis (lateral curvature of the vertebral malformed delphinids from around the world column; Wise et al., 1997), kyphosis (increased (Table 1), which were gathered by posting a request convexity in the curvature of the vertebral column for information on the e-mail discussion list, as viewed from the side; Wise et al., 1997), lordosis MARMAM (Marine Mammals Research and Con- (anterior concavity in the curvature of the vertebral servation), in 1996. A standardized questionnaire column as viewed from the side; Wise et al., 1997), was mailed to respondents, and only those that kyphoscoliosis (backward and lateral curvature of provided a detailed account of vertebral column the vertebral column; Miller & Brackman Keane, malformation were included, resulting in a further 1983), or lordoscoliosis (lordosis complicated with 11 cases (six bottlenose dolphins, one common scoliosis; Miller & Brackman Keane, 1983). Other dolphin, and four killer whales). malformations, e.g., anomalies in vertebra struc- ture, may only become apparent upon necropsy (e.g., Dixon, 1984; Kompanje, 1995a). Results Few detailed cases of conspicuous vertebral col- umn malformations in cetaceans, describing the Case no. 1: ‘Quasi’ (Catalogue no. 43—J. Berghan) pathology, have been reported (bottlenose dolphin, was an adult male bottlenose dolphin with 2000 EAAM 18 Table 1. Unpublished reports of delphinids with malformations. Animal name and/or J. Berghan and I. N. Visser Species reference no. Details of animal Location Details of malformation Source Bottlenose Adult male; wild; West of Ibiza Island, Kyphoscoliosis—lateral deviation to the left then back L. Silvani, dolphin sighted 28/08/1991 Balearic Islands, to the right, caudal to the dorsal fin. Kyphotic hump R. Sagarminaga Spain directly caudal to the dorsal fin. & A. Can˜adas, pers. comm., 1996 Bottlenose Adult female; wild; West of Ibiza Island, Lordosis—horizontal displacement with concavity in L. Silvani, dolphin sighted 28/08/1991 Balearic Islands, caudal region. Vertebral column appeared to be rigid R. Sagarminaga Spain from caudal of the dorsal fin to the peduncle. & A. Can˜adas, pers. comm., 1996 Bottlenose Ayla, MZG Female calf; Minnesota Zoo, USA Lordoscoliosis—lateral deviation to the right then D. M. Fusco, dolphin IO no. 7579 captive born 26/09/1992 back to the left, caudal to the dorsal fin. Indented pers. comm., 1996 vertical crease on right lateral surface, slightly caudal to the dorsal fin. Prominent protrusion on the left lateral surface, directly ventral and slightly caudal to the dorsal fin. Dorsal fin leaned to the left. Pronounced horizontal displacement with concavity in lumbocaudal region. Developed slight curvature of the vertebral column several weeks after birth, which progressed with age. Bottlenose Miai Juvenile female; Windsor Safari Park, Scoliosis—lateral deviation to the left then back to the D. C. T. Lindsay, dolphin captive born 30/10/1989; UK right, caudal to the dorsal fin. Indented vertical crease pers. comm., 1996 died 15/08/1992 directly opposite each lateral convexity caused by the sigmoid curve. Dorsal fin leaned to the left. Born with malformation. Bottlenose Amber Adult female; captured from Windsor Safari Park, Scoliosis—developed slight lateral deviation to the left D. C. T. Lindsay, dolphin Gulf of Mexico 21/07/1980; UK then back to the right, caudal to the dorsal fin, pers. comm., 1996 died 25/05/1984 overnight. Died approximately seven weeks after malformation developed. Bottlenose No. AGQ-88-M2 7-yr, 7-mo old male; Kyphoscoliosis—mild lateral deviation with concavity A. G. Watson, dolphin captive born; died in captivity on left lateral surface. Kyphotic hump centred at T12. pers. comm., 1996 Possibly resulted from a compression fracture of a thoracic vertebra. Common Adult; wild; sighted -/11/1996 Alboran Sea Lordosis—horizontal displacement with concavity in A. Can˜adas, dolphin lumbocaudal region. pers. comm., 1997 Vertebral column malformations in delphinids Killer whale Humpy, Calf; wild; sighted 04/11/1995 Tysfjord, Norway Kyphosis—horizontal displacement with convexity in F. Ugarte, Y Pod no. 10 thoracic region. pers. comm., 1996 Killer whale Quasimodo, Adult male; wild; Tysfjord, Norway Kyphosis—horizontal displacement with convexity in F. Ugarte, no. N-192 sighted 13/11/1992, 18/11/1992, thoracic region. pers. comm., 1996 16/11/1995, 19/11/1995 Killer whale Calf (neonate); wild; Ofotfjord, Norway Scoliosis—lateral deviation to the left then back to the F. Ugarte, sighted 08/11/1996 right, caudal to the dorsal fin. Dorsal fin severed. pers. comm., 1996 Killer whale No. KB-6 Wild; sighted -/01/1990 Central west coast, Pronounced protrusion on left dorso-lateral surface, D. Vongraven Norway directly caudal to the dorsal fin. Extreme lean of the & A. Bisther, dorsal fin to the right. pers. comm., 1996 19 20 J. Berghan and I. N. Visser Figure 1. Quasi (case no. 1), a bottlenose dolphin with kyphoscoliosis (dorsal view), photographed in the Bay of Islands, NZ. Photo: J. Berghan. Figure 2. Quasi (case no. 1), a bottlenose dolphin with kyphoscoliosis (lateral view), photographed in the Bay of Islands, NZ. Photo: J. Berghan. kyphoscoliosis, observed in the Bay of Islands back to the left (Fig. 1). A prominent protrusion (3514S 17408E) from January 1994 to July 1997. was visible on the left lateral surface, slightly caudal A lateral sigmoid curve, concave to the left, was to the dorsal fin. When viewed laterally, Quasi had apparent from directly caudal to the dorsal finto a prominent kyphotic hump directly caudal to his the peduncle, with a deviation of approximately 30 dorsal fin (Fig. 2). Indented vertical creases were degrees to the right then approximately 30 degrees apparent on the opposite side to the left lateral Vertebral column malformations in delphinids 21 Figure 3. Timmy (case no. 2), a juvenile bottlenose dolphin with scoliosis, photographed in the Bay of Islands, NZ, in April 1996. Photo: I. N. Visser. protrusion and the first sigmoid convexity. Quasi 19-mo period, from September 1994 to April 1996, had an open lesion perpendicular and directly in the Bay of Islands. At the time of the first cranial to his dorsal fin, surrounded by white tissue. observation, Timmy was a neonate, determined by The lesion opened to a depth of approximately the small size, fetal folds and poor motor skills. A 20 mm. The dorsal fin leaned approximately 30 fist-sized protrusion was apparent on the right degrees to the right. During the 3-yr, 7-mo period lateral surface, slightly caudal to the dorsal fin, with over which Quasi was regularly observed, the a shallow depression on the dorsal surface, directly malformation appeared to remain unchanged. cranial to the dorsal fin. By December 1994 the Case no. 2: ‘Timmy’ (Catalogue no. 11— protrusion had developed, and in May 1995 the J. Berghan) was a juvenile bottlenose dolphin with protrusion was conspicuous, with a slight depres- scoliosis (Fig. 3). This animal was monitored over a sion cranial and caudal to it. The depression cranial 22 J. Berghan and I. N. Visser to the dorsal fin showed a white lesion, approxi- perpendicular and directly cranial to the dorsal mately 40–50 mm in length, perpendicular to the fin, which leaned approximately 20 degrees to dorsal fin. By September 1995 the protrusion was the left. prominent, the dorsal fin leaned approximately Case no. 6: ‘Quasimodo’ (Catalogue no. MN 30 degrees to the left, and the body axis, from the 31—J. Williams & K. Schneider) was an adult male dorsal fin to the peduncle, appeared to deviate away bottlenose dolphin with kyphosis, observed in from the protrusion, curving back to the right. By Doubtful Sound (4519S 16658E) in November April 1996 a concave curve had developed on the 1995.
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