Hector's Dolphin Facts - Cephalorhynchus hectori


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http://goo.gl/GHc3h - Hector's Dolphin (Cephalorhynchus hectori)One of the rarest of all dolphins in the world is the Hector's Dolphin. It is also classified as one of the smallest marine dolphins. - Visit us: http://goo.gl/ZkZz7
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Hector's Dolphin Facts - Cephalorhynchus hectori

  1. 1. Photograph by James Shook, who retains copyright and releases the image under the Creative Commons Attribute 2.5 License. HECTOR’S DOLPHIN Cephalorhynchus hectori BIOEXPEDITION.COM
  2. 2. Hector’s Dolphin Hectors dolphin is endemic to the coastal waters of New Zealand. Is one of the rarest and smallest of marine dolphins in the world. Hector’s dolphin was named after Sir James Hector, a Scottish geologist and naturalist. BIOEXPEDITION.COM
  3. 3. Anatomy The sides and back of this dolphin are light grey. The dorsal fin, flippers and flukes are black. A white stripe extends from the belly onto each flank below the dorsal fin. BIOEXPEDITION.COM
  4. 4. Anatomy Adults measure between 47 and 62 inches and weighs up to 110 lb. Hector’s dolphins can have as many as 31 conical teeth on both sides of the upper and lower jaws. Their teeth can be up to 13 mm in length and 3 mm in diameter. BIOEXPEDITION.COM
  5. 5. Habitat This species is found around the majority of South New Zealand. The total population around the South Island was estimated at about 7,000 individuals. They are typically observed in water less than 90 meters deep and less than 1 km from the shoreline. BIOEXPEDITION.COM
  6. 6. Behavior Hector’s Dolphins live in fission-fusion social groups from two to ten individuals. Hectors dolphins emit sounds that are thought to be used for communication. BIOEXPEDITION.COM
  7. 7. Behavior They tend to swim closer together when in close proximity to boats, which may be an indication of stress. BIOEXPEDITION.COM
  8. 8. Feeding Feeding is a group activity, and prey includes small fish and arrow squid. The Cephalorhynchus hectori undertake short dives for about 90 seconds to catch prey. BIOEXPEDITION.COM
  9. 9. Feeding The largest prey item recovered from a Hector’s dolphin stomach was an undigested red cod with a weight of one pound. BIOEXPEDITION.COM
  10. 10. Reproduction Both sexes have multiple mates. Females reach maturity at around 7 to 9 years of age, and males between 5 and 9 years. Their gestation period is between 10 and 12 months. BIOEXPEDITION.COM
  11. 11. Reproduction Calves are born in late spring to early summer. Hector’s dolphin calves have a total length of 2–2.6 feet and weigh 18–22 pounds. BIOEXPEDITION.COM
  12. 12. Threats The commercial and recreational fishers are the major threat to the survival of this species. Habitat modification is another potential threat for the future. Also collisions with ships are known to injure or kill Hector’s dolphins. BIOEXPEDITION.COM
  13. 13. Threats Noise produced by shipping may also be a disturbance to these cetaceans. In New Zealand five marine mammal sanctuaries were designated to provide protection from non-fisheries related impacts. BIOEXPEDITION.COM
  14. 14. Credits BioExpedition.com Facebook.com/bioexpedition Twitter.com/bioexpedition Youtube.com/bioexpedition Pinterest.com/bioexpedition Dolphins-world.com • Copyright© Bioexpedition.com 2012 Photograph by James Shook, who retains copyright and releases the image under the Creative Commons Attribute 2.5 License.