Dioithona oculata | |
---|---|
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Copepoda |
Order: | Cyclopoida |
Family: | Oithonidae |
Genus: | Dioithona |
Species: | D. oculata |
Binomial name | |
Dioithona oculata | |
Synonyms | |
Oithona oculataFarran, 1913 |
Dioithona oculata is a species of small crustacean, a marine copepod in the order Cyclopoida. It is native to the Indo-Pacific region but has spread to other parts of the world. It is a free-swimming epipelagic species found near the surface of the water. It was first described as Oithona oculata by the Irish zoologist George Philip Farran in 1913.
Free-living copepods have translucent bodies divided into a broad head, a thorax bearing swimming legs and a narrow, limbless abdomen. They have a major articulated joint between the front and rear portions where the body flexes ventrally. [2] Male Dioithona oculata are 0.6 to 0.79 mm (0.024 to 0.031 in) long, with females being slightly larger at 0.62 to 0.9 mm (0.024 to 0.035 in). A distinguishing feature for this species is the structure of the lens of the eye. [3]
Dioithona oculata is native to the Indo-Pacific region but has expanded its range into the Atlantic. Its range includes Madagascar, the Gulf of Oman, the Persian Gulf, lagoons in the Laccadives, Rodrigues, the Nicobar Islands, Christmas Island, the Strait of Malacca, the Yellow Sea, the East China Sea, Taiwan, South Korea, Japan, the Caroline Islands, the Palau Islands, the Great Barrier Reef, New Caledonia, the Samoa Islands, northern Chile and California. The Atlantic range includes the Cape of Good Hope in South Africa, Brazil, Colombia, Belize, the Caribbean, Jamaica and the Gulf of Mexico. [3] It can form swarms, dense aggregations of individuals, and these have been observed in shallow water over sandy bottoms, above patches of algae in reef areas and over algae on rocky shores. [3] They also form swarms in sunlit patches of water among mangrove roots at the edge of lagoons in the Caribbean where they have reached densities of 90 copepods per ml (0.034 fl oz). [4]
The swarming behaviour of these copepods has been studied among red mangroves in Belize. It was found that swarms only formed by day, with the individuals dispersing at night. Swarms were denser in June than in January and consisted of adults and late-stage larvae. In nearby open water younger larvae predominated during the day and swarming did not take place. [5] In a current of up to 2 cm (0.8 in), the swarm maintains its position, usually in a position where a beam of sunlight penetrates the canopy. There is an energy cost in maintaining the swarm in a particular location and each individual faces greater competition for food which makes the adaptive value of this behaviour unclear. Swarming may provide greater breeding opportunities, reduce the chance of involuntary dispersal by the current and protect against predation. [6] In fact, there are few planktivorous fish feeding on this copepod among the mangroves and the main predator is the medusa of the tiny box jellyfish Tripedalia cystophora . [4]
Plankton are the diverse collection of organisms that drift in water but are unable to actively propel themselves against currents. The individual organisms constituting plankton are called plankters. In the ocean, they provide a crucial source of food to many small and large aquatic organisms, such as bivalves, fish, and baleen whales.
A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. Most coral reefs are built from stony corals, whose polyps cluster in groups.
Copepods are a group of small crustaceans found in nearly every freshwater and saltwater habitat. Some species are planktonic, some are benthic, a number of species have parasitic phases, and some continental species may live in limnoterrestrial habitats and other wet terrestrial places, such as swamps, under leaf fall in wet forests, bogs, springs, ephemeral ponds, puddles, damp moss, or water-filled recesses of plants (phytotelmata) such as bromeliads and pitcher plants. Many live underground in marine and freshwater caves, sinkholes, or stream beds. Copepods are sometimes used as biodiversity indicators.
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Pelagia noctiluca is a jellyfish in the family Pelagiidae and the only currently recognized species in the genus Pelagia. It is typically known in English as the mauve stinger, but other common names are purple-striped jelly, purple stinger, purple people eater, purple jellyfish, luminous jellyfish and night-light jellyfish. In Greek, pelagia means "(she) of the sea", from pelagos "sea, open sea"; in Latin noctiluca is the combining form of nox, "night"", and lux, "light"; thus, Pelagia noctiluca can be described as a marine organism with the ability to glow in the dark (bioluminescence). It is found worldwide in tropical and warm temperate seas, although it is suspected that records outside the North Atlantic region, which includes the Mediterranean and Gulf of Mexico, represent closely related but currently unrecognized species.
Kakaban island is part of the Derawan Islands, East Kalimantan, Indonesia.
Marine ecosystems are the largest of Earth's aquatic ecosystems and exist in waters that have a high salt content. These systems contrast with freshwater ecosystems, which have a lower salt content. Marine waters cover more than 70% of the surface of the Earth and account for more than 97% of Earth's water supply and 90% of habitable space on Earth. Seawater has an average salinity of 35 parts per thousand of water. Actual salinity varies among different marine ecosystems. Marine ecosystems can be divided into many zones depending upon water depth and shoreline features. The oceanic zone is the vast open part of the ocean where animals such as whales, sharks, and tuna live. The benthic zone consists of substrates below water where many invertebrates live. The intertidal zone is the area between high and low tides. Other near-shore (neritic) zones can include mudflats, seagrass meadows, mangroves, rocky intertidal systems, salt marshes, coral reefs, lagoons. In the deep water, hydrothermal vents may occur where chemosynthetic sulfur bacteria form the base of the food web.
The Liquid Jungle Lab (LJL) is a tropical marine research station on the island of Canales de Tierra on the western coast of Pacific Panamá along a primary marine biological corridor. The LJL research campus was completed in 2004 and is part of a private 3,500 hectare reserve composed of primary forest, mangroves, tide pools, and a rocky inter-tidal zone that transitions into fringing coral reefs.
Coastal fish, also called inshore fish or neritic fish, inhabit the sea between the shoreline and the edge of the continental shelf. Since the continental shelf is usually less than 200 metres (660 ft) deep, it follows that pelagic coastal fish are generally epipelagic fish, inhabiting the sunlit epipelagic zone. Coastal fish can be contrasted with oceanic fish or offshore fish, which inhabit the deep seas beyond the continental shelves.
Tritonicula hamnerorum is a species of dendronotid nudibranch. It is a marine gastropod mollusc in the family Tritoniidae. A number of Caribbean species of Tritonia were moved to a new genus Tritonicula in 2020 as a result of an integrative taxonomic study of the family Tritoniidae.
Isognomon alatus, the flat tree oyster, is a species of bivalve mollusc in the family Isognomonidae. It can be found along the Atlantic coast of North America, ranging from southern Florida to Brazil and Bermuda.
Vallentinia gabriellae, the hitch-hiking jellyfish, is a species of small, inconspicuous hydrozoan in the family Olindiidae. It is endemic to a few isolated parts of the western Atlantic Ocean. It is elusive in the wild but sometimes makes its appearance unexpectedly in seawater cultures of other organisms in the laboratory.
Micromussa lordhowensis, previously known as the Acan Lord, is a species of stony coral in the family Lobophylliidae. It is a widespread and common coral with large polyps occurring on shallow reefs in the Indo-Pacific Ocean. It was originally classified under the genus Acanthastrea, and reclassified under the genus Micromussa in 2016.
Tripedalia cystophora is a small species of box jellyfish in the family Tripedaliidae. It is native to the Caribbean Sea and the Central Indo-Pacific.
Calanus marshallae is a species of copepod which forms part of the zooplankton in the northern Atlantic Ocean and the northern Pacific Ocean.
Oithona is a planktonic crustacean genus found in marine, brackish, fresh water environments. Oithona has been described as the most ubiquitous and abundant copepod in the world's oceans. It was first described by Baird in 1843 using the species Oithona plumifera as taxon type.
Chiropsella bronzie is a species of box jellyfish. It is considered much less of a threat to humans than some of its relatives. The species was described in 2006, and is one of four species in the genus Chiropsella. Chiropsella bronzie can be found in shallow waters off the coast of Queensland, Australia.
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