This is a project of collecting postcards from all over the world.
Showing posts with label Cocos (Keeling) Islands. Show all posts
Showing posts with label Cocos (Keeling) Islands. Show all posts
Friday, May 27, 2011
Cocos (Keeling) Islands - Hermit Crab
Hermit Crab
Cocos (Keeling) Islands, Indian Ocean.
One of the four postcards sent by Kakak Norana from Cocos (Keeling) Islands.
This is from Wikipedia : Hermit crabs are decapod crustaceans of the superfamily Paguroidea.[1] Most of the 1100 species possess an asymmetrical abdomen which is concealed in an empty gastropod shell that is carried around by the hermit crab.
Most species have long, spirally curved abdomens, which are soft, unlike the hard, calcified abdomens seen in related crustaceans. The vulnerable abdomen is protected from predators by a salvaged empty seashell carried by the hermit crab, into which its whole body can retract. Most frequently hermit crabs use the shells of sea snails (although the shells of bivalves and scaphopods and even hollow pieces of wood and stone are used by some species). The tip of the hermit crab's abdomen is adapted to clasp strongly onto the columella of the snail shell.
As the hermit crab grows in size, it has to find a larger shell and abandon the previous one. This habit of living in a second hand shell gives rise to the popular name "hermit crab", by analogy to a hermit who lives alone. Several hermit crab species, both terrestrial and marine, use "vacancy chains" to find new shells: when a new, bigger shell becomes available, hermit crabs gather around it and form a kind of queue from largest to smallest. When the largest crab moves into the new shell, the second biggest crab moves into the newly vacated shell, thereby making its previous shell available to the third crab, and so on.
A gastropod shell that has been used by a hermit crab (or crabs) for a considerable period of time shows a notch in the columella where the abdomen was clamped on to the shell. Some shells that are occupied for very long periods of time are subject to so much external abrasion that they develop holes, which make them unsuitable for use.
Most species are aquatic and live in varying depths of saltwater, from shallow reefs and shorelines to deep sea bottoms. Tropical areas host some terrestrial species, though even those have aquatic larvae and therefore need access to water for reproduction.
A few species do not use a "mobile home" and inhabit immobile structures left by polychaete worms, vermetid gastropods, corals and sponges.
Cocos (Keeling) Islands - Dancing Waves
Cocos (Keeling) Islands - Coconut Palms
Cocos (Keeling) Islands - Jukong Race
Jukong Race
Cocos (Keeling) Islands, Indian Ocean.
Sent by Kakak Norana from Cocos (Keeling) Islands. This is our first of the four postcards from Cocos (Keeling Islands.
This is from Wikipedia : The Territory of the Cocos (Keeling) Islands, also called Cocos Islands and Keeling Islands, is a territory of Australia, located in the Indian Ocean, southwest of Christmas Island and approximately midway between Australia and Sri Lanka.
The territory consists of two atolls and 27 coral islands, of which two, West Island and Home Island, are inhabited with a total population of approximately 600.
The Cocos (Keeling) Islands consist of two flat, low-lying coral atolls with an area of 14.2 square kilometres (5.5 sq mi), 26 kilometres (16 mi) of coastline, a highest elevation of 5 metres (16 ft) and thickly covered with coconut palms and other vegetation. The climate is pleasant, moderated by the southeast trade winds for about nine months of the year and with moderate rainfall.[citation needed] Cyclones may occur in the early months of the year.
North Keeling Island is an atoll consisting of just one C-shaped island, a nearly closed atoll ring with a small opening into the lagoon, about 50 metres (160 ft) wide, on the east side. The island measures 1.1 square kilometres (270 acres) in land area and is uninhabited. The lagoon is about 0.5 square kilometres (120 acres). North Keeling Island and the surrounding sea to 1.5 km (0.93 mi) from shore form the Pulu Keeling National Park, established on 12 December 1995. It is home to the only surviving population of the endemic, and endangered, Cocos Buff-banded Rail.
South Keeling Islands is an atoll consisting of 24 individual islets forming an incomplete atoll ring, with a total land area of 13.1 square kilometres (5.1 sq mi). Only Home Island and West Island are populated. The Cocos Malays maintain weekend shacks, referred to as pondoks, on most of the larger islands.
There are no rivers or lakes on either atoll. Fresh water resources are limited to water lenses on the larger islands, underground accumulations of rainwater lying above the seawater. These lenses are accessed through shallow bores or wells.
Cocos (Keeling) Island is located on almost exactly the opposite side of the globe from Cocos Island, Costa Rica.
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