Decapoda Division 1 is a sand crab. Carapace trapezoid. After the narrow front width, the amount of narrow, eyes wide, eyes slender stalk. Two claws of male size and the poor. Large large claws (called mating claws), even bigger than the body weight is almost a whole half. Tiny little claws for feeding (called feeding claws). Female small and symmetrical two claws, knuckles spoon-shaped, both feeding claws. Widely distributed in the global tropical and subtropical intertidal zone, is a cluster of warm water crabs. China fiddler crabs are about 10 species, common species are: arc side fiddler crabs, concave refers to the fiddler crabs, clean, and ringed fiddler crabs fiddler crabs, etc., and distributed in the coastal provinces of Hainan and Taiwan Province.
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Introduction
招潮蟹 简介
招潮蟹 简介
招潮蟹 简介
Fiddler crabs fiddler crab Also known as Call crab (calling crab). Amon crustaceans (Crustacea) Decapoda (Decapoda) sand crabs Division (Ocypodidae) is a fiddler crabs (Uca) of about 65 species of crab collectively. Carapace trapezoid. After the narrow front width, the amount of narrow, eyes wide, eyes slender stalk. Males of a chela is always much larger than the other claws (called mating claws), claws large and even big bigger than the body weight is almost half of the whole, a bit like a violin, it derives its English name. Tiny little claws for feeding (called feeding claws). Females in the two claws are quite small, but symmetrical, spoon-shaped knuckle, both feeding claws. If males have lost large claws, the former Director of a small claws, but the original is long small claws into big claws, instead of losing the big claws. In the warm, tropical Gulf numerous. Living in underwater caves, deep hole up to 30 cm (about 1 foot), feeding on algae and other organisms. Common species such as North America's aggressive move tide (U. pugnax), messenger trick tide (U. pugilator) and move the red tide Festival (U. minax), are 2.5 to 3 centimeters (1 to 1.2 inches) size, found in North Atlantic coast of New England to the Gulf Coast states. Males than females bright colors. Colors include coral, brilliant green, golden yellow and light blue.
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Geographic distribution
招潮蟹 地理分布
招潮蟹 地理分布
招潮蟹 地理分布
Widely distributed in the global tropical and subtropical intertidal zone, is a cluster of warm water crabs. China fiddler crabs are about 10 species, common species are: arc side fiddler crabs, concave refers to the fiddler crabs, clean, and ringed fiddler crabs fiddler crabs, etc., and distributed in the coastal provinces of Hainan and Taiwan Province.
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Habits
招潮蟹 习性
招潮蟹 习性
Fiddler crabs burrowing camp life, and often specific cave, but often every few days that will be replaced. Burrowing depth, and water table, is generally required to reach moist soil cave at. Many male crab's also built a semi-circular umbrella cover, cover for the hole. Activities with the tide of fiddler crabs have a certain fluctuation laws, the height of the stops on the bottom of the cave, then to the beach at low tide on the activity, feeding, patching holes, and finally the occupation of the cave, ready to mate. Their acceptance by the visual and auditory communication, contact, warning signal. Together to achieve social behavior. Fiddler crabs to sediment for food, to devour the sediment, organic matter intake which will spit out the inedible parts. Before mating, the male performance show of waving large claws for various performances, attract females, in the intertidal zone activities like Summon the tide, hence the name trick tide. Then follow the male followed the female to mate into the cave. At night, males often have large claws rhythmic tapping on the ground to attract females.
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Feeding
招潮蟹 摄食
招潮蟹 摄食
招潮蟹 摄食
Fiddler crabs claws scraped the mud with a small surface of the small particles of soil sent to the mouth, these small particles contain a lot of debris, algae, bacteria and other micro-organisms, into the mouth later, he incurs the body to absorb. The mouth there is a special organ, the food can be classified and filtered, the residue can not use claws removed and then placed in the ground by a small, concentrated form we see a small soil ball, called the "fecal to be" different from the real through the digestive tract from the anus feces.
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Feeding method
招潮蟹 饲养方法
招潮蟹 饲养方法
招潮蟹 饲养方法
Breeding fiddler crabs can tank or larger glass jars, plastic jar and other containers, the bottom covered with sand, brick sloping. Because the habits of fiddler crabs love digging, it is recommended sand depth of 10 centimeters. Adjusted the 0.4-0.5% concentration of salt water, submerged to the slope at 1/3-1/2, able to do so can also install a small filter. To change the water every week in summer 1 / 3, changing the water in winter time can be a little longer. Food: fiddler crabs may feed the pieces of fish, clams or small shrimp and other food should be placed in the water the sand surface, feeding on the line every day, and eat the food to be cleared up, so as not to pollute the water.
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Animals can perform complex calculations
Australia's northeast coast in the beach habitat for a large number of fiddler crabs, arthropods, but these appear to be normal with amazing mathematical ability. First discovered this phenomenon is the Australian National University biologist Joe Chen Zell two visual and Jane Hemi. Fiddler crabs of the activities it has always been the center of the cave, when it climbed out of the cave to walk outside, often it's the cave as a reference. However, often near the cave from some of the sediment formed after the tide receded the sand, and fiddler crabs because of their line of sight is blocked and can not see the cave. So, how fiddler crabs go home? The researchers found that fiddler crabs back to the nest does not look like other animals, as marked on the path, but it depends on the brain natural ability with mathematical calculations. Fiddler crabs every step, will re-calculate the location of the cave, are taking steps and these steps position.
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Marine life
招潮蟹 海洋生物
招潮蟹 海洋生物
招潮蟹 海洋生物
Fiddler crabs Fiddler crabs, body dark brown, full red. A large male crab claws, the overall weight of about half the weight; the other half is smaller than the walking legs. Two female crab claws are small and of equal size. Groups of fiddler crabs burrowing beach to the soil containing organic debris for food. Low tide, the harbor, on the mudflats in the estuary, often see many exotic crabs running around, busy, very active. They run on the mudflat at low tide, feeding, high tide when they quickly got into the cave. The activity of this crab with sea water at high tide, ebb closely related, hence the name "Dr. tide" or "look tide."
People know that ocean tides caused primarily by the lunar gravity, while the level is also affected by tidal gravitational effects of the sun. It seems both fiddler crabs under the sun, but also according to the moon to calibrate their own "clock." They change color according to the solar day, while with the tidal fluctuation, that is, according to lunar day to find food. They feel the tide coming in about 10 minutes before, it will be safely hidden in a cave. Time they eat the same month.
