The white abalone is an endangered species in the United States; it may now have the smallest population of all eight of the abalone species on the west coast of North America.
In the most northerly part of the California range, white abalone were reported as being more common along the mainland coast. However, in the middle portion of the California range, they were noted to occur more frequently at the offshore islands, especially San Clemente and Santa Catalina Islands. At the more southerly end of the range, in Baja California, Mexico, white abalone were reported to occur more commonly along the mainland coast, but were also found at a number of islands including Isla Cedros and Isla Natividad.[3]
It remains unknown whether this distribution pattern was a result of lack of suitable habitat along the mainland coast in the mid portion of the range, or was instead due to overfishing in these more accessible mainland regions.[3]
Since the mid-1990s, extremely low numbers of isolated survivors have been identified along the mainland coast in Santa Barbara County and at some of the offshore islands and banks in the middle portion of the range, indicating the current range of white abalone in California may be similar to what it was historically.[3]
No recent information on current range is available for Baja California. The white abalone population in Mexico is thought to be depleted based on commercial fishery data, but the status of the species in Mexico remains largely unknown.[3]
DescriptionEdit
Two White Abalones. Left: dorsal view; Right: ventral view, showing the large muscular foot
ShellEdit
The white abalone usually has between 3-5 open holes (respiratory pores) in its shell. These holes collectively make up what is known as the selenizone which form as the shell grows. The shell is oval-shaped, very thin and deep. White abalone can grow to about 10 in (25 cm), but are usually 5–8 in (13–20 cm).[3]
AnatomyEdit
The epipodial tentacles are lacy, beige and yellow-green in color. The bottom of its foot is orange, and the epipodium (a sensory structure and extension of the foot that bears tentacles) is a mottled orange tan.[3]
EcologyEdit
HabitatEdit
The white abalone is the deepest dwelling of eight species of California abalones, living at depths from 80 to 200 ft (24–61 m).[3] White abalone are found in open low and high relief rock or boulder habitat that is interspersed with sand channels. Sand channels may be important for the movement and concentration of drift macroalgae, and a variety of red algae, upon which white abalone are known to feed.[3]
Like many gastropods, white abalone have a complex life cycle involving larval stages. Fertilized eggs hatch into larvae; these larvae eventually metamorphose into the adult form and settle from the plankton to a hard substrate.[3] As broadcast spawning gastropods, white abalone reproduce by releasing their eggs and sperm into the surrounding water. If fertilized, the eggs hatch after only one day, but high concentrations of sperm are required in order for an egg to be fertilized. Therefore, aggregations of adult male and female abalone are necessary for successful fertilization to occur.[3]
California Commercial White Abalone Haliotis sorenseni Landings for 1972–1992. The price exponentially increased as catch decreased.[5] Even taking fishing effort into account, the volume of abalones fished is inversely proportional to the price (power regression model, F40,2 = 139.96; p < 0.0001).[5] open squares - commercial catch per unit effort left y axis - thousands of pounds of shell per vessel filled circles - price of Haliotis sorenseni right y axis - US$ per pound.
Human useEdit
Scripps Institution of Oceanography biologists conducted surveys of white abalone deep water habitat in the early 1970s, finding high concentrations of about one white abalone per square yard. Such densities were comparable to abundance of shallower species of abalone found in previously unfished or protected areas. Unfortunately, the high demand for the species led to a "boom-and-bust" fishery, which decimated the populations of this species in seven years.
Considered a delicacy in California, white abalones, the rarest of the six abalone species in the state, have declined by over 99.99% due to increasing overfishing, in part illegal – the fishery was closed in 1996 – while at the same time, prices have escalated. Although white abalones were the first marine invertebrate on the United States Federal List of Endangered Species in 2001, the species could nevertheless become extinct unless extraordinary recovery measures are implemented.[5] White abalone is being maricultured in order to produce young that can be placed back in the ocean, in hopes of bringing this species back to secure population levels before it becomes extinct. The White Abalone Restoration Consortium is a partnership with The Cultured Abalone Farm, the Santa Barbara Museum of Natural History Sea Center and the National Oceanic and Atmospheric Administration Southwest Fisheries Science Center on the Gaviota Coast which is studying the marine snail and restoring the wild populations. They are also collaborating in developing curriculum to educate the next generation about sustainable aquaculture and conservation.[6]
^Peters, H., Rogers-Bennett, L. (2021). "Haliotis sorenseni". IUCN Red List of Threatened Species. 2021: e.T78771696A78772593. doi:10.2305/IUCN.UK.2021-1.RLTS.T78771696A78772593.en.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ abcdefghijklm"NOAA Fisheries - White Abalone (Haliotis sorenseni)". National Oceanic and Atmospheric Administration (USA). 5 May 2017. Retrieved 2009-10-21.
^McCormick, Thomas B.; Navas, Gabriela; Buckley, Lorraine M.; Biggs, Christopher (December 2016). "Effect of Temperature, Diet, Light, and Cultivation Density on Growth and Survival of Larval and Juvenile White Abalone Haliotis sorenseni (Bartsch, 1940)". Journal of Shellfish Research (Submitted manuscript). 35 (4): 981–992. doi:10.2983/035.035.0421. ISSN 0730-8000. OCLC 6907956712.
^ abcdCourchamp F., Angulo E., Rivalan P., Hall R. J., Signoret L., Bull L. & Meinard Y. (2006) "Rarity Value and Species Extinction: The Anthropogenic Allee Effect". PLoS Biology4(12): e415. doi:10.1371/journal.pbio.0040415
^Mason, Dave (2021-09-15). "Learning first-hand about conservation". Santa Barbara News-Press. Retrieved 2022-01-08.
External linksEdit
Wikimedia Commons has media related to Haliotis sorenseni.
"Race To Save the White Abalone" video links (NOAA Southwest Fisheries Science Center)
White Abalone Research (NOAA Southwest Fisheries Science Center)
National Marine Fisheries Service. (October 2008). "White Abalone Recovery Plan (Haliotis sorenseni)". National Marine Fisheries Service, Long Beach, CA. PDF
"Hope for the White Abalone" (2004)
Sonoma County Abalone Network
"Haliotis (Haliotis) sorenseni". Gastropods.com. Retrieved 16 January 2019.
October 19, 2023
haliotis, sorenseni, white, abalone, scientific, name, species, large, snail, marine, gastropod, mollusk, family, haliotidae, abalones, live, individual, left, center, shell, rock, covered, with, coralline, algae, conservation, statuscritically, endangered, iu. The white abalone scientific name Haliotis sorenseni is a species of large sea snail a marine gastropod mollusk in the family Haliotidae the abalones 2 Haliotis sorenseniA live individual of Haliotis sorenseni left of center The shell and the rock are covered with red coralline algae Conservation statusCritically Endangered IUCN 3 1 1 Scientific classificationDomain EukaryotaKingdom AnimaliaPhylum MolluscaClass GastropodaSubclass VetigastropodaOrder LepetellidaSuperfamily HaliotoideaFamily HaliotidaeGenus HaliotisSpecies H sorenseniBinomial nameHaliotis sorenseniBartsch 1940The white abalone is an endangered species in the United States it may now have the smallest population of all eight of the abalone species on the west coast of North America Contents 1 Distribution 2 Description 2 1 Shell 2 2 Anatomy 3 Ecology 3 1 Habitat 3 2 Feeding habits 3 3 Life cycle 4 Human use 5 References 6 External linksDistribution Edit nbsp A map of the distribution of the White abalone Haliotis sorenseniHistorically the white abalone ranged from Point Conception California to Baja California Mexico and was found especially on the offshore islands 3 In the most northerly part of the California range white abalone were reported as being more common along the mainland coast However in the middle portion of the California range they were noted to occur more frequently at the offshore islands especially San Clemente and Santa Catalina Islands At the more southerly end of the range in Baja California Mexico white abalone were reported to occur more commonly along the mainland coast but were also found at a number of islands including Isla Cedros and Isla Natividad 3 It remains unknown whether this distribution pattern was a result of lack of suitable habitat along the mainland coast in the mid portion of the range or was instead due to overfishing in these more accessible mainland regions 3 Since the mid 1990s extremely low numbers of isolated survivors have been identified along the mainland coast in Santa Barbara County and at some of the offshore islands and banks in the middle portion of the range indicating the current range of white abalone in California may be similar to what it was historically 3 No recent information on current range is available for Baja California The white abalone population in Mexico is thought to be depleted based on commercial fishery data but the status of the species in Mexico remains largely unknown 3 Description Edit nbsp Two White Abalones Left dorsal view Right ventral view showing the large muscular footShell Edit The white abalone usually has between 3 5 open holes respiratory pores in its shell These holes collectively make up what is known as the selenizone which form as the shell grows The shell is oval shaped very thin and deep White abalone can grow to about 10 in 25 cm but are usually 5 8 in 13 20 cm 3 Anatomy Edit The epipodial tentacles are lacy beige and yellow green in color The bottom of its foot is orange and the epipodium a sensory structure and extension of the foot that bears tentacles is a mottled orange tan 3 Ecology EditHabitat Edit The white abalone is the deepest dwelling of eight species of California abalones living at depths from 80 to 200 ft 24 61 m 3 White abalone are found in open low and high relief rock or boulder habitat that is interspersed with sand channels Sand channels may be important for the movement and concentration of drift macroalgae and a variety of red algae upon which white abalone are known to feed 3 Feeding habits Edit The white abalone is known to be a herbivore grazing mainly on macroalgae such as Laminaria farlowii and Agarum fimbriatum and also several species of red algae 3 Other species it eats include Chondracanthus exasperatus Laminaria farlowii Macrocystis pyrifera and Palmaria mollis 4 Life cycle Edit Like many gastropods white abalone have a complex life cycle involving larval stages Fertilized eggs hatch into larvae these larvae eventually metamorphose into the adult form and settle from the plankton to a hard substrate 3 As broadcast spawning gastropods white abalone reproduce by releasing their eggs and sperm into the surrounding water If fertilized the eggs hatch after only one day but high concentrations of sperm are required in order for an egg to be fertilized Therefore aggregations of adult male and female abalone are necessary for successful fertilization to occur 3 nbsp California Commercial White Abalone Haliotis sorenseni Landings for 1972 1992 The price exponentially increased as catch decreased 5 Even taking fishing effort into account the volume of abalones fished is inversely proportional to the price power regression model F40 2 139 96 p lt 0 0001 5 open squares commercial catch per unit effort left y axis thousands of pounds of shell per vessel filled circles price of Haliotis sorenseni right y axis US per pound Human use EditScripps Institution of Oceanography biologists conducted surveys of white abalone deep water habitat in the early 1970s finding high concentrations of about one white abalone per square yard Such densities were comparable to abundance of shallower species of abalone found in previously unfished or protected areas Unfortunately the high demand for the species led to a boom and bust fishery which decimated the populations of this species in seven years Considered a delicacy in California white abalones the rarest of the six abalone species in the state have declined by over 99 99 due to increasing overfishing in part illegal the fishery was closed in 1996 while at the same time prices have escalated Although white abalones were the first marine invertebrate on the United States Federal List of Endangered Species in 2001 the species could nevertheless become extinct unless extraordinary recovery measures are implemented 5 White abalone is being maricultured in order to produce young that can be placed back in the ocean in hopes of bringing this species back to secure population levels before it becomes extinct The White Abalone Restoration Consortium is a partnership with The Cultured Abalone Farm the Santa Barbara Museum of Natural History Sea Center and the National Oceanic and Atmospheric Administration Southwest Fisheries Science Center on the Gaviota Coast which is studying the marine snail and restoring the wild populations They are also collaborating in developing curriculum to educate the next generation about sustainable aquaculture and conservation 6 References EditSourcesThis article incorporates public domain text a public domain work of the United States Government from reference 3 and CC BY 2 5 text from reference 5 Team Spawns Rare White Abalone White Abalone An Extinct Possibility Notes Peters H Rogers Bennett L 2021 Haliotis sorenseni IUCN Red List of Threatened Species 2021 e T78771696A78772593 doi 10 2305 IUCN UK 2021 1 RLTS T78771696A78772593 en a href Template Cite journal html title Template Cite journal cite journal a CS1 maint multiple names authors list link Rosenberg G 2014 Haliotis sorenseni Accessed through World Register of Marine Species at http www marinespecies org aphia php p taxdetails amp id 445362 on 2014 10 29 a b c d e f g h i j k l m NOAA Fisheries White Abalone Haliotis sorenseni National Oceanic and Atmospheric Administration USA 5 May 2017 Retrieved 2009 10 21 McCormick Thomas B Navas Gabriela Buckley Lorraine M Biggs Christopher December 2016 Effect of Temperature Diet Light and Cultivation Density on Growth and Survival of Larval and Juvenile White Abalone Haliotis sorenseni Bartsch 1940 Journal of Shellfish Research Submitted manuscript 35 4 981 992 doi 10 2983 035 035 0421 ISSN 0730 8000 OCLC 6907956712 a b c d Courchamp F Angulo E Rivalan P Hall R J Signoret L Bull L amp Meinard Y 2006 Rarity Value and Species Extinction The Anthropogenic Allee Effect PLoS Biology 4 12 e415 doi 10 1371 journal pbio 0040415 Mason Dave 2021 09 15 Learning first hand about conservation Santa Barbara News Press Retrieved 2022 01 08 External links Edit nbsp Wikimedia Commons has media related to Haliotis sorenseni Race To Save the White Abalone video links NOAA Southwest Fisheries Science Center White Abalone Research NOAA Southwest Fisheries Science Center National Marine Fisheries Service October 2008 White Abalone Recovery Plan Haliotis sorenseni National Marine Fisheries Service Long Beach CA PDF Hope for the White Abalone 2004 Sonoma County Abalone Network Haliotis Haliotis sorenseni Gastropods com Retrieved 16 January 2019 Retrieved from https en wikipedia org w index php title Haliotis sorenseni amp oldid 1138484777, wikipedia, wiki, book, books, library,
