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Ectosymbiosis is a form of symbiotic behavior in which an organism lives on the body surface of another organism, including internal surfaces such as the lining of the digestive tube and the ducts of glands. The ectosymbiotic species, or ectosymbiont, is generally an immobile organism existing off of biotic substrate through mutualism, commensalism, or parasitism. Ectosymbiosis is found throughout a diverse array of environments and in many different species.
The Gulf of Maine is a large gulf of the Atlantic Ocean on the east coast of North America. It is bounded by Cape Cod at the eastern tip of Massachusetts in the southwest and by Cape Sable Island at the southern tip of Nova Scotia in the northeast. The gulf includes the entire coastlines of the U.S. states of New Hampshire and Maine, as well as Massachusetts north of Cape Cod, and the southern and western coastlines of the Canadian provinces of New Brunswick and Nova Scotia, respectively.
Kelp forests are underwater areas with a high density of kelp, which covers a large part of the world's coastlines. Smaller areas of anchored kelp are called kelp beds. They are recognized as one of the most productive and dynamic ecosystems on Earth. Although algal kelp forest combined with coral reefs only cover 0.1% of Earth's total surface, they account for 0.9% of global primary productivity. Kelp forests occur worldwide throughout temperate and polar coastal oceans. In 2007, kelp forests were also discovered in tropical waters near Ecuador.
Nephrops norvegicus, known variously as the Norway lobster, Dublin Bay prawn, shlobster (shrimp-lobster), langoustine or scampi, is a slim, coral colored lobster that grows up to 25 cm (10 in) long, and is "the most important commercial crustacean in Europe". It is now the only extant species in the genus Nephrops, after several other species were moved to the closely related genus Metanephrops. It lives in the north-eastern Atlantic Ocean, and parts of the Mediterranean Sea, but is absent from the Baltic Sea and Black Sea. Adults emerge from their burrows at night to feed on worms and fish.
An urchin barren is commonly defined as an urchin-dominated area with little or no kelp. Urchin grazing pressure on kelp is a direct and observable cause of a "barren" area. However, determining which factors contribute to shifting a kelp bed to an urchin barrens is a complex problem and remains a matter of debate among scientists.
The Jonah crab is a marine brachyuran crab that inhabits waters along the east coast of North America from Newfoundland to Florida. Jonah crabs possess a rounded, rough-edged carapace with small light spots, and robust claws with dark brown-black tips. The maximum reported carapace width for males is 222 mm, while females rarely exceed 150 mm. It is the closest relative to the European brown crab in the Western Atlantic.
Kina is a sea urchin endemic to New Zealand. This echinoderm belongs to the family Echinometridae and it can reach a maximum diameter of 16–17 cm.
Hematodinium perezi is a pathogenic dinoflagellate parasite that infects crustaceans, including the Blue Crab and Norway Lobster and has been observed to have a significant impact on crustacean fisheries. Infected crustaceans frequently show signs of weakness and lethargy, and often die due to stress-related handling from fishing as well as metabolic exhaustion due to reduced feeding. This parasite is known to be quite transmissible between various crustacean hosts.
Strongylocentrotus droebachiensis is commonly known as the green sea urchin because of its characteristic green color. This is unfortunate as Psammechinus miliaris is also called the green sea urchin. It is commonly found in northern waters all around the world including both the Pacific and Atlantic Oceans to a northerly latitude of 81 degrees and as far south as Maine and England. The average adult size is around 50 mm (2 in), but it has been recorded at a diameter of 87 mm (3.4 in). The green sea urchin prefers to eat seaweeds but will eat other organisms. They are eaten by a variety of predators, including sea stars, crabs, large fish, mammals, birds, and humans. The species name "droebachiensis" is derived from the name of the town Drøbak in Norway.
Pockmarks are concave, crater-like depressions on seabeds that are caused by fluids escaping and erupting through the seafloor. They can vary in size and have been found worldwide.
Like humans and other animals, fish suffer from diseases and parasites. Fish defences against disease are specific and non-specific. Non-specific defences include skin and scales, as well as the mucus layer secreted by the epidermis that traps microorganisms and inhibits their growth. If pathogens breach these defences, fish can develop inflammatory responses that increase the flow of blood to infected areas and deliver white blood cells that attempt to destroy the pathogens.
Hematodinium is a genus of dinoflagellates. Species in this genus, such as Hematodinium perezi, the type species, are internal parasites of the hemolymph of crustaceans such as the Atlantic blue crab and Norway lobster. Species in the genus are economically damaging to commercial crab fisheries, including causing bitter crab disease in the large Tanner or snow crab fisheries of the Bering Sea.
Epizootic Shell Disease (ESD) is an infection of the outer shell layer of the American lobster (Homarus americanus) by chitinolytic bacteria. Infection results in lesions and the degradation of each layer of shell, resulting in secondary bacterial infections and potentially death.
Sea star wasting disease or starfish wasting syndrome is a disease of starfish and several other echinoderms that appears sporadically, causing mass mortality of those affected. There are approximately 40 species of sea stars that have been affected by this disease. At least 20 of these species were on the Northwestern coast of Mexico to Alaska. The disease seems to be associated with increased water temperatures in some locales, but not others. It starts with the emergence of lesions, followed by body fragmentation and death. In 2014 it was suggested that the disease is associated with a single-stranded DNA virus now known as the sea star-associated densovirus (SSaDV). However, this hypothesis was refuted by recent research in 2018 and 2020. Sea star wasting disease is still not fully understood.
Neoparamoeba pemaquidensis is a single-celled species of marine amoebozoan in the genus Neoparamoeba. The species is also called Paramoeba pemaquidensis.
Philasterides dicentrarchi is a marine protozoan ciliate that was first identified in 1995 after being isolated from infected European sea bass reared in France. The species was also identified as the causative agent of outbreaks of scuticociliatosis that occurred between summer 1999 and spring 2000 in turbot cultivated in the Atlantic Ocean. Infections caused by P. dicentrarchi have since been observed in turbot reared in both open flow and recirculating production systems. In addition, the ciliate has also been reported to cause infections in other flatfishes, such as the olive flounder in Korea and the fine flounder in Peru, as well as in seadragons, seahorses, and several species of sharks in other parts of the world.
Scuticociliatosis is a severe and often fatal parasitic infection of several groups of marine organisms. Species known to be susceptible include a broad range of teleosts, seahorses, sharks, and some crustaceans. The disease can be caused by any one of about 20 distinct species of unicellular eukaryotes known as scuticociliates, which are free-living marine microorganisms that are opportunistic or facultative parasites. Scuticociliatosis has been described in the wild, in captive animals in aquariums, and in aquaculture. It is best studied in fish species that are commonly farmed, in which typical effects of infection include skin ulceration, hemorrhage, and necrosis, with post-mortem examination identifying ciliates in the skin, gills, blood, and internal organs including the brain.
Isotealia antarctica, the salmon anemone, is a species of sea anemone in the family Actiniidae. It is found in the southern Atlantic and Pacific Oceans and the waters around Antarctica. It is a filter feeder and opportunistic predator.
Maria Byrne is an Australian marine biologist, and professor of marine and developmental biology at the University of Sydney and a member of the Sydney Environment Institute. She spent 12 years as director of the university's research station on One Tree Island.
Ian Hewson is an Australian American biological oceanographer and marine ecologist who is a professor of microbiology at Cornell University. He leads the Cornell Marine Mass Mortality Laboratory, where he studies the drives of marine mass mortalities. He is leader of diversity, equity, and inclusion for the Department of Microbiology.
References
- ↑ Paramoeba perniciosa (Paramoebiasis) of Lobsters
- ↑ "Archived copy" (PDF). Archived from the original (PDF) on 2008-05-15. Retrieved 2008-04-02.
{{cite web}}: CS1 maint: archived copy as title (link) - ↑ PID – Paramoeba Taxonomy
- ↑ Deaths of Lobsters in Long Island Sound Tied to Tiny Parasite – New York Times
- ↑ What's killing off lobsters in Long Island Sound? By Christine Woodside Grist | Main Dish | 20 Jun 2000
- ↑ Feehan, C.; Scheibling, R.E.; Lauzon-Guay, J.-S. (February 2012). "An outbreak of sea urchin disease associated with a recent hurricane: Support for the "killer storm hypothesis" on a local scale". Journal of Experimental Marine Biology and Ecology. 413: 159–168. doi:10.1016/j.jembe.2011.12.003.
- ↑ Feehan, Cj; Scheibling, Re (March 17, 2014). "Disease as a control of sea urchin populations in Nova Scotian kelp beds". Marine Ecology Progress Series. 500: 149–158. Bibcode:2014MEPS..500..149F. doi: 10.3354/meps10700 . ISSN 0171-8630.
- ↑ Feehan, Cj; Johnson-Mackinnon, J; Scheibling, Re; Lauzon-Guay, Js; Simpson, Agb (April 11, 2013). "Validating the identity of Paramoeba invadens, the causative agent of recurrent mass mortality of sea urchins in Nova Scotia, Canada". Diseases of Aquatic Organisms. 103 (3): 209–227. doi: 10.3354/dao02577 . ISSN 0177-5103. PMID 23574707.
- ↑ Feehan, C.; Scheibling, R.E.; Lauzon-Guay, J.-S. (February 2012). "An outbreak of sea urchin disease associated with a recent hurricane: Support for the "killer storm hypothesis" on a local scale". Journal of Experimental Marine Biology and Ecology. 413: 159–168. doi:10.1016/j.jembe.2011.12.003.
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