DUSKY DOLPHIN FACTS Lagenorhynchus obscurus BIOEXPEDITION.COM.

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Presentation transcript:

DUSKY DOLPHIN FACTS Lagenorhynchus obscurus BIOEXPEDITION.COM

Dusky Dolphin BIOEXPEDITION.COM

Dusky Dolphin IT’S FOUND IN COASTAL WATERS IN THE SOUTHERN HEMISPHERE. IT IS VERY CLOSELY GENETICALLY RELATED TO THE PACIFIC WHITE-SIDED DOLPHIN BIOEXPEDITION.COM

Anatomy DUSKY DOLPHINS ARE SMALL AND MODERATELY ROBUST. THEY ARE UP TO 6 FEET IN LENGTH AND 210 POUNDS IN WEIGH. BIOEXPEDITION.COM

Anatomy A DUSKY DOLPHIN HAS A BLUISH-BLACK TAIL AND BACK. THE UNDERSIDE IS WHITE AND THE TIPS OF THE SNOUT AND LOWER JAW ARE DARK. THEY HAVE PAIRS OF SMALL TEETH. BIOEXPEDITION.COM

Habitat THE DUSKY DOLPHIN IS A COASTAL SPECIES. USUALLY FOUND OVER CONTINENTAL SHELVES AND SLOPES. DUSKY DOLPHINS ARE USUALLY FOUND IN WARM TO COOL TEMPERATE WATERS BIOEXPEDITION.COM

Habitat THE LAGENORHYNCHUS OBSCURUS COVERS THE COASTS OF SOUTH AMERICA AUSTRALIA AFRICA TASMANIA NEW ZEALAND OCEANIA ISLANDS. BIOEXPEDITION.COM

Behavior THE DUSKY DOLPHIN IS A VERY SOCIAL SPECIES. THEY ARE USUALLY FOUND IN GROUPS BETWEEN 25 AND 500 INDIVIDUALS, BUT HAVE BEEN OCCASIONALLY SEEN IN LARGER GROUPS OF UP TO 1000 INDIVIDUALS. DUSKY DOLPHINS ARE HIGHLY CURIOUS AND USUALLY EASY TO APPROACH. BIOEXPEDITION.COM

Behavior THIS DOLPHIN IS KNOWN FOR ITS REMARKABLE AERIAL ACROBATICS. THREE DIFFERENT TYPES OF SOUNDS ARE PRODUCED BY DUSKY DOLPHINS: CLICK TRAINS, BURST PULSES AND WHISTLES. THEY ARE ESPECIALLY ATTRACTED TO BOATS. REACHING SPEEDS UP TO 20 KNOTS. BIOEXPEDITION.COM

Feeding THE MAIN PREY SPECIES OF DUSKY DOLPHINS INCLUDE: ANCHOVY SHRIMP SQUID VARIETY OF FISH. THIS SPECIES MAY ALSO FEED AT NIGHT. BIOEXPEDITION.COM

Feeding DUSKY DOLPHINS ARE USUALLY COORDINATE HUNTERS. CO-OPERATIVE FEEDING IS PERFORMED REGULARLY IN SOME AREAS. THESE DOLPHINS USE THEIR ECHOLOCATION TO DETECT AND ISOLATE AN INDIVIDUAL PREY. BIOEXPEDITION.COM

Reproduction MATING IS BELIEVED TO OCCUR IN SPRING. MATING GROUPS ARE GENERALLY MADE OF AROUND TEN MALES AND A SINGLE FEMALE. BIOEXPEDITION.COM

Reproduction A SINGLE CALF IS BORN AFTER A GESTATION PERIOD OF 11 MONTHS. THE CALF RANGES IN BODY LENGTH FROM 55 TO 70 CENTIMETRES AT BIRTH. THE LACTATION PERIOD LASTS FOR 18 MONTHS. CALVES ARE PARTICULARLY VULNERABLE TO PREDATORS LIKE KILLER WHALES AND SHARKS BIOEXPEDITION.COM

Threats THOUSANDS OF DUSKY DOLPHINS ARE KILLED ANNUALLY BY THE SMALL-CETACEAN FISHERY IN PERU. THE INCIDENTAL CATCH, POLLUTION AND TOURISM ARE THE GREATEST THREATS TO THE DUSKY DOLPHIN. BIOEXPEDITION.COM

Threats DUSKY DOLPHINS ARE LISTED AS DATA DEFICIENT BY THE IUCN BUT ARE PROTECTED IN MUCH OF ITS RANGE. BIOEXPEDITION.COM

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