Dugongidae

Dugong skeleton displayed at Philippine National Museum

Aardvark2 (PSF) colourised

Rhynchocyon chrysopygus-J Smit white background

The animal kingdom, arranged according to its organization, serving as a foundation for the natural history of animals (Pl. 18) (Chrysochloris asiatica)

Brehms Thierleben - Allgemeine Kunde des Thierreichs (1876) (Tenrec ecaudatus)

Dugongidae is a family within the order Sirenia, which also includes three species of manatees. The family Dugongidae is unique in its representation by a single living species, the dugong (Dugong dugon), which is found in warm coastal waters from the western Pacific Ocean to the eastern coast of Africa. This family is distinct from manatees primarily in its habitat (marine versus freshwater or estuarine for manatees) and its tail, which is fluked like a whale's. The members of this family are large, herbivorous mammals that spend their entire lives in the water.

Description

Dugongidae members have a fusiform body shape, which is well adapted to their aquatic lifestyle. Their forelimbs have evolved into flippers, while they have no hind limbs, only a tail for propulsion. The dugong's tail is fluked, similar to that of cetaceans, which aids in their swimming. Their bodies are covered with sparse, bristly hair, which is thought to aid in tactile sensation. The dugong's snout is downturned, an adaptation for feeding on seagrass in benthic environments.

Habitat and Distribution

Dugongs are primarily found in warm coastal waters in the Indo-Pacific region. Their range extends from the east coast of Africa to Vanuatu in the Pacific, including the Red Sea, Indian Ocean, and the Pacific islands. They inhabit shallow waters, often staying in areas where seagrass beds are abundant, as these are their primary food source.

Diet

The diet of the Dugongidae is strictly herbivorous, feeding mainly on seagrass. They play a significant role in the ecology of their habitat by acting as major grazers of seagrass beds, which helps maintain the health and diversity of these ecosystems.

Conservation Status

The dugong is currently listed as a vulnerable species by the International Union for Conservation of Nature (IUCN). Their populations are threatened by habitat loss, pollution, entanglement in fishing gear, and hunting. Conservation efforts are focused on protecting their habitats, enforcing anti-hunting regulations, and mitigating accidental captures.

Evolution and Fossil Record

The Dugongidae family has a rich fossil record, with several extinct genera identified. These fossils indicate that the family once had a much broader distribution and included species with a variety of sizes and ecological niches. The evolution of the Dugongidae is closely linked to the development of seagrass habitats, which they depend on for food.

See Also

• Sirenia
• Manatee
• Marine mammal conservation

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