Stomach contents of sperm whales Physeter macrocephalus stranded in the North Sea 1990-1996

M B Santos, G J Pierce, P R Boyle, R J Reid, H M Ross, I A P Patterson, C C Kinze, S Tougaard, R Lick, U Piatkowski, V Hernandez-Garcia

Research output: Contribution to journalLiterature review

62 Citations (Scopus)

Abstract

Stomach contents of 17 sperm whales Physeter macrocephalus stranded in Scotland and Denmark during 1990-96 were analysed. All were sub-adult or adult males and stranded between November and March. They had presumably entered the North Sea during their southward migration from feeding grounds in Arctic waters. Other studies indicate that the majority of the whales were apparently healthy. The diet of these whales was found to consist almost entirely of cephalopods, principally squid of the genus Gonatus (hereafter 'Gonatus', but probably G. fabricii, an oceanic species characteristic of Arctic waters). The other prey species identified were also mostly oceanic cephalopods: the squids Histioteuthis bonnellii, Teuthowenia megalops and Todarodes sagittatus and the octopus Haliphron atlanticus. Although these results are consistent with other recent studies in the area based on single stranded whales, they differ from results of work on whales caught during commercial whaling operations in Icelandic waters (1960s to 1980s) in that little evidence of predation on fish was found in the present study. Remains of single individuals of the veined squid Loligo forbesi, the northern octopus Eledone cirrhosa and the saithe Pollachius virens provided the only possible evidence of feeding in the North Sea. We infer that sperm whales do not enter the North Sea. to feed. The timing, and large and uniform sizes of the Gonatus species eaten (most had mantle lengths in the range 195 to 245 mm), as estimated from measurements of the lower beaks, and the seasonality of the strandings is consistent with the whales having fed on mature squid, possibly spawning concentrations-as has recently been reported for bottlenose whales. Assuming that the diet recorded in this study was repre sentative of sperm whales during the feeding season, as much as 500000 t of Gonatus could be removed by sperm whales in Norwegian waters each year and up to 3 times that figure from the eastern North Atlantic as a whole. Evidence from other studies indicates that Gonatus is an important food resource for a wide range of marine predators in Arctic waters.

Original languageEnglish
Pages (from-to)281-294
Number of pages14
JournalMarine Ecology Progress Series
Volume183
Publication statusPublished - 1999

Keywords

  • feeding ecology
  • cetacea
  • stranding
  • Gonatus
  • cephalopoda
  • Galapagos-Islands
  • feeding Success
  • cephalopod remains
  • marine mammals
  • diet
  • Atlantic
  • cetaceans
  • behavior
  • squids
  • coast

Cite this

Santos, M. B., Pierce, G. J., Boyle, P. R., Reid, R. J., Ross, H. M., Patterson, I. A. P., ... Hernandez-Garcia, V. (1999). Stomach contents of sperm whales Physeter macrocephalus stranded in the North Sea 1990-1996. Marine Ecology Progress Series, 183, 281-294.

Stomach contents of sperm whales Physeter macrocephalus stranded in the North Sea 1990-1996. / Santos, M B ; Pierce, G J ; Boyle, P R ; Reid, R J ; Ross, H M ; Patterson, I A P ; Kinze, C C ; Tougaard, S ; Lick, R ; Piatkowski, U ; Hernandez-Garcia, V .

In: Marine Ecology Progress Series, Vol. 183, 1999, p. 281-294.

Research output: Contribution to journalLiterature review

Santos, MB, Pierce, GJ, Boyle, PR, Reid, RJ, Ross, HM, Patterson, IAP, Kinze, CC, Tougaard, S, Lick, R, Piatkowski, U & Hernandez-Garcia, V 1999, 'Stomach contents of sperm whales Physeter macrocephalus stranded in the North Sea 1990-1996', Marine Ecology Progress Series, vol. 183, pp. 281-294.
Santos MB, Pierce GJ, Boyle PR, Reid RJ, Ross HM, Patterson IAP et al. Stomach contents of sperm whales Physeter macrocephalus stranded in the North Sea 1990-1996. Marine Ecology Progress Series. 1999;183:281-294.
Santos, M B ; Pierce, G J ; Boyle, P R ; Reid, R J ; Ross, H M ; Patterson, I A P ; Kinze, C C ; Tougaard, S ; Lick, R ; Piatkowski, U ; Hernandez-Garcia, V . / Stomach contents of sperm whales Physeter macrocephalus stranded in the North Sea 1990-1996. In: Marine Ecology Progress Series. 1999 ; Vol. 183. pp. 281-294.
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title = "Stomach contents of sperm whales Physeter macrocephalus stranded in the North Sea 1990-1996",
abstract = "Stomach contents of 17 sperm whales Physeter macrocephalus stranded in Scotland and Denmark during 1990-96 were analysed. All were sub-adult or adult males and stranded between November and March. They had presumably entered the North Sea during their southward migration from feeding grounds in Arctic waters. Other studies indicate that the majority of the whales were apparently healthy. The diet of these whales was found to consist almost entirely of cephalopods, principally squid of the genus Gonatus (hereafter 'Gonatus', but probably G. fabricii, an oceanic species characteristic of Arctic waters). The other prey species identified were also mostly oceanic cephalopods: the squids Histioteuthis bonnellii, Teuthowenia megalops and Todarodes sagittatus and the octopus Haliphron atlanticus. Although these results are consistent with other recent studies in the area based on single stranded whales, they differ from results of work on whales caught during commercial whaling operations in Icelandic waters (1960s to 1980s) in that little evidence of predation on fish was found in the present study. Remains of single individuals of the veined squid Loligo forbesi, the northern octopus Eledone cirrhosa and the saithe Pollachius virens provided the only possible evidence of feeding in the North Sea. We infer that sperm whales do not enter the North Sea. to feed. The timing, and large and uniform sizes of the Gonatus species eaten (most had mantle lengths in the range 195 to 245 mm), as estimated from measurements of the lower beaks, and the seasonality of the strandings is consistent with the whales having fed on mature squid, possibly spawning concentrations-as has recently been reported for bottlenose whales. Assuming that the diet recorded in this study was repre sentative of sperm whales during the feeding season, as much as 500000 t of Gonatus could be removed by sperm whales in Norwegian waters each year and up to 3 times that figure from the eastern North Atlantic as a whole. Evidence from other studies indicates that Gonatus is an important food resource for a wide range of marine predators in Arctic waters.",
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T1 - Stomach contents of sperm whales Physeter macrocephalus stranded in the North Sea 1990-1996

AU - Santos, M B

AU - Pierce, G J

AU - Boyle, P R

AU - Reid, R J

AU - Ross, H M

AU - Patterson, I A P

AU - Kinze, C C

AU - Tougaard, S

AU - Lick, R

AU - Piatkowski, U

AU - Hernandez-Garcia, V

PY - 1999

Y1 - 1999

N2 - Stomach contents of 17 sperm whales Physeter macrocephalus stranded in Scotland and Denmark during 1990-96 were analysed. All were sub-adult or adult males and stranded between November and March. They had presumably entered the North Sea during their southward migration from feeding grounds in Arctic waters. Other studies indicate that the majority of the whales were apparently healthy. The diet of these whales was found to consist almost entirely of cephalopods, principally squid of the genus Gonatus (hereafter 'Gonatus', but probably G. fabricii, an oceanic species characteristic of Arctic waters). The other prey species identified were also mostly oceanic cephalopods: the squids Histioteuthis bonnellii, Teuthowenia megalops and Todarodes sagittatus and the octopus Haliphron atlanticus. Although these results are consistent with other recent studies in the area based on single stranded whales, they differ from results of work on whales caught during commercial whaling operations in Icelandic waters (1960s to 1980s) in that little evidence of predation on fish was found in the present study. Remains of single individuals of the veined squid Loligo forbesi, the northern octopus Eledone cirrhosa and the saithe Pollachius virens provided the only possible evidence of feeding in the North Sea. We infer that sperm whales do not enter the North Sea. to feed. The timing, and large and uniform sizes of the Gonatus species eaten (most had mantle lengths in the range 195 to 245 mm), as estimated from measurements of the lower beaks, and the seasonality of the strandings is consistent with the whales having fed on mature squid, possibly spawning concentrations-as has recently been reported for bottlenose whales. Assuming that the diet recorded in this study was repre sentative of sperm whales during the feeding season, as much as 500000 t of Gonatus could be removed by sperm whales in Norwegian waters each year and up to 3 times that figure from the eastern North Atlantic as a whole. Evidence from other studies indicates that Gonatus is an important food resource for a wide range of marine predators in Arctic waters.

AB - Stomach contents of 17 sperm whales Physeter macrocephalus stranded in Scotland and Denmark during 1990-96 were analysed. All were sub-adult or adult males and stranded between November and March. They had presumably entered the North Sea during their southward migration from feeding grounds in Arctic waters. Other studies indicate that the majority of the whales were apparently healthy. The diet of these whales was found to consist almost entirely of cephalopods, principally squid of the genus Gonatus (hereafter 'Gonatus', but probably G. fabricii, an oceanic species characteristic of Arctic waters). The other prey species identified were also mostly oceanic cephalopods: the squids Histioteuthis bonnellii, Teuthowenia megalops and Todarodes sagittatus and the octopus Haliphron atlanticus. Although these results are consistent with other recent studies in the area based on single stranded whales, they differ from results of work on whales caught during commercial whaling operations in Icelandic waters (1960s to 1980s) in that little evidence of predation on fish was found in the present study. Remains of single individuals of the veined squid Loligo forbesi, the northern octopus Eledone cirrhosa and the saithe Pollachius virens provided the only possible evidence of feeding in the North Sea. We infer that sperm whales do not enter the North Sea. to feed. The timing, and large and uniform sizes of the Gonatus species eaten (most had mantle lengths in the range 195 to 245 mm), as estimated from measurements of the lower beaks, and the seasonality of the strandings is consistent with the whales having fed on mature squid, possibly spawning concentrations-as has recently been reported for bottlenose whales. Assuming that the diet recorded in this study was repre sentative of sperm whales during the feeding season, as much as 500000 t of Gonatus could be removed by sperm whales in Norwegian waters each year and up to 3 times that figure from the eastern North Atlantic as a whole. Evidence from other studies indicates that Gonatus is an important food resource for a wide range of marine predators in Arctic waters.

KW - feeding ecology

KW - cetacea

KW - stranding

KW - Gonatus

KW - cephalopoda

KW - Galapagos-Islands

KW - feeding Success

KW - cephalopod remains

KW - marine mammals

KW - diet

KW - Atlantic

KW - cetaceans

KW - behavior

KW - squids

KW - coast

M3 - Literature review

VL - 183

SP - 281

EP - 294

JO - Marine Ecology Progress Series

JF - Marine Ecology Progress Series

SN - 0171-8630

ER -