''Thermosphaeroma thermophilum'' is a crustacean in the family
Sphaeromatidae
Sphaeromatidae (marine pillbug family) is a family of isopods, often encountered on rocky shores and in shelf waters in temperate zones. The family includes almost 100 genera and 619 known marine species (and about 65 in fresh water). Within the ...
. It is commonly known as the Socorro isopod or Socorro sowbug. It was
endemic
Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...
to the thermal water o
Sedillo Spring This was located in
Socorro County
Socorro County is a county in the U.S. state of New Mexico. As of the 2010 census, the population was 17,866. The county seat is Socorro. The county was formed in 1852 as one of the original nine counties of New Mexico Territory. Socorro wa ...
in the state of
New Mexico
)
, population_demonym = New Mexican ( es, Neomexicano, Neomejicano, Nuevo Mexicano)
, seat = Santa Fe
, LargestCity = Albuquerque
, LargestMetro = Tiguex
, OfficialLang = None
, Languages = English, Spanish ( New Mexican), Navajo, Ker ...
,
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
.
Harriet Richardson
Harriet Richardson Searle (May 9, 1874 – March 28, 1958) was an American carcinologist. She was known as the first lady of Isopoda, isopods and was one of the first female carcinologists, with only Mary J. Rathbun, Mary Jane Rathbun before her.
...
first described the Socorro isopod in 1897. As of 2006, it resides in
captive
Captive or Captives may refer to:
Arts, entertainment, and media Films
* ''Captive'' (1980 film), a sci-fi film, starring Cameron Mitchell and David Ladd
* ''Captive'' (1986 film), a British-French film starring Oliver Reed
* ''Captive'' (1991 ...
populations at the Socorro Isopod Propagation Facility (SIPF),
Albuquerque Biological Park
The ABQ BioPark (or Albuquerque Biological Park) is an environmental museum located in Albuquerque, New Mexico. It contains four separate facilities:
* ABQ BioPark Aquarium - An aquarium with a ocean tank containing Gulf of Mexico saltwater spec ...
(ABP), the
Minnesota Zoo
The Minnesota Zoo (formerly the Minnesota Zoological Garden), is an AZA-accredited zoo in Apple Valley, Minnesota. It is one of two state-supported zoos in the United States, with the other being the North Carolina Zoo. When it opened on May 22, ...
, the
New Mexico Department of Game and Fish
The New Mexico Department of Game and Fish (NMDGF) is a state-level government department within the New Mexico Governor's Cabinet that is responsible for maintaining wildlife and fish in the state. The NMDGF undertakes protection, conservation and ...
Laboratory in Santa Fe, and by the Department of Biology at
New Mexico Tech
The New Mexico Institute of Mining and Technology (New Mexico Tech and formerly New Mexico School of Mines) is a public university in Socorro, New Mexico. It offers over 30 bachelor of science degrees in technology, the sciences, engineering, man ...
.
It was
reintroduced
Species reintroduction is the deliberate release of a species into the wild, from captivity or other areas where the organism is capable of survival. The goal of species reintroduction is to establish a healthy, genetically diverse, self-sustainin ...
following a near-
extinction
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...
incident in 1988. The wild population became extinct when a tree root burst the pipe and cut off water flow to the concrete pools.
Description
The body size of the Socorro isopod is
sexually dimorphic
Sexual dimorphism is the condition where the sexes of the same animal and/or plant species exhibit different morphological characteristics, particularly characteristics not directly involved in reproduction. The condition occurs in most ani ...
, varying noticeably depending on gender. Males tend to reach 7.1 millimeters in length on average (4-13 millimeter range). Meanwhile, females tend to reach 5.1 millimeters in length on average (4.5-6 millimeter range).
Both sexes are gray to reddish-brown in color, with the edges of their bodies being tinted bright orange.
Their body is flattened and segmented, with the last body segment possessing
uropods
Uropods are posterior appendages found on a wide variety of crustaceans. They typically have functions in locomotion.
Definition
Uropods are often defined as the appendages of the last body segment of a crustacean. An alternative definition sugg ...
. They have seven pairs of legs and a pair of
antennae on their head.
Life History
The Socorro isopod has a lifespan of 1 year. During the timespan between March and October, the mean body size for both males and females increases. It then rapidly decreases from October to February. They reach
sexual maturity
Sexual maturity is the capability of an organism to reproduce. In humans it might be considered synonymous with adulthood, but here puberty is the name for the process of biological sexual maturation, while adulthood is based on cultural definitio ...
between 4-11 weeks, with males maturing faster than females. Some females won’t sexually mature at all because they will reabsorb their
ovaries
The ovary is an organ in the female reproductive system that produces an ovum. When released, this travels down the fallopian tube into the uterus, where it may become fertilized by a sperm. There is an ovary () found on each side of the body. T ...
, the reason this might happen is unknown. Females are
iteroparous
Semelparity and iteroparity are two contrasting reproductive strategies available to living organisms. A species is considered semelparous if it is characterized by a single reproductive episode before death, and iteroparous if it is characteri ...
and are capable of
reproducing multiple times throughout their lives.
Given adequate food and proper temperature conditions they can give birth every two months.
They are receptive to mating during their
molting
In biology, moulting (British English), or molting (American English), also known as sloughing, shedding, or in many invertebrates, ecdysis, is the manner in which an animal routinely casts off a part of its body (often, but not always, an outer ...
process. They store
sperm
Sperm is the male reproductive cell, or gamete, in anisogamous forms of sexual reproduction (forms in which there is a larger, female reproductive cell and a smaller, male one). Animals produce motile sperm with a tail known as a flagellum, whi ...
at this time to use it later when they
ovulate
Ovulation is the release of eggs from the ovaries. In women, this event occurs when the ovarian follicles rupture and release the secondary oocyte ovarian cells. After ovulation, during the luteal phase, the egg will be available to be fertilized ...
. Their ovaries will mature after mating, an adaptation that evolved in response to male isopods being very aggressive during mating.
Females will carry their offspring for about 30 days, after which they will give birth to between 3 and 57 offspring under laboratory conditions, with an average of 16 offspring.
After giving birth, their ovaries will need about 30 days to recover before they can mate again. Their
brood
Brood may refer to:
Nature
* Brood, a collective term for offspring
* Brooding, the incubation of bird eggs by their parents
* Bee brood, the young of a beehive
* Individual broods of North American Periodical Cicadas:
** Brood X, the largest b ...
is skewed towards males.
Sometimes pregnant females won’t give birth because they reabsorb their unborn offspring.
April sees the largest number of pregnant females before declining to a minimum number around late summer.
Ecology
Diet
The Socorro isopod is
omnivorous
An omnivore () is an animal that has the ability to eat and survive on both plant and animal matter. Obtaining energy and nutrients from plant and animal matter, omnivores digest carbohydrates, protein, fat, and fiber, and metabolize the nutri ...
, eating both plant material and other aquatic
invertebrates
Invertebrates are a paraphyletic group of animals that neither possess nor develop a vertebral column (commonly known as a ''backbone'' or ''spine''), derived from the notochord. This is a grouping including all animals apart from the chordate ...
.
They feed on
blue-green algae
Cyanobacteria (), also known as Cyanophyta, are a phylum of gram-negative bacteria that obtain energy via photosynthesis. The name ''cyanobacteria'' refers to their color (), which similarly forms the basis of cyanobacteria's common name, bl ...
and
leaves
A leaf (plural, : leaves) is any of the principal appendages of a vascular plant plant stem, stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", wh ...
or
detritus
In biology, detritus () is dead particulate organic material, as distinguished from dissolved organic material. Detritus typically includes the bodies or fragments of bodies of dead organisms, and fecal material. Detritus typically hosts commun ...
from cottonwood. They also eat
juniper
Junipers are coniferous trees and shrubs in the genus ''Juniperus'' () of the cypress family Cupressaceae. Depending on the taxonomy, between 50 and 67 species of junipers are widely distributed throughout the Northern Hemisphere, from the Arcti ...
, or
mesquite
Mesquite is a common name for several plants in the genus ''Prosopis'', which contains over 40 species of small leguminous trees. They are native to dry areas in the Americas.
They have extremely long roots to seek water from very far under grou ...
trees, and
dragonfly
A dragonfly is a flying insect belonging to the infraorder Anisoptera below the order Odonata. About 3,000 extant species of true dragonfly are known. Most are tropical, with fewer species in temperate regions. Loss of wetland habitat threate ...
nymphs
A nymph ( grc, νύμφη, nýmphē, el, script=Latn, nímfi, label=Modern Greek; , ) in ancient Greek folklore is a minor female nature deity. Different from Greek goddesses, nymphs are generally regarded as personifications of nature, are typ ...
.
A large part of their diet is also made up by
cannibalism
Cannibalism is the act of consuming another individual of the same species as food. Cannibalism is a common ecological interaction in the animal kingdom and has been recorded in more than 1,500 species. Human cannibalism is well documented, b ...
. Healthy and uninjured isopods are sometimes cannibalized by larger individuals. Victims of cannibalism are always smaller than their attackers. The individuals that are either injured or dying are often eaten by other isopods.
This cannibalistic behavior helps to structure the population
demographics
Demography () is the statistical study of populations, especially human beings.
Demographic analysis examines and measures the dimensions and dynamics of populations; it can cover whole societies or groups defined by criteria such as edu ...
of the
species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...
. Aside from cannibalism, the Socorro isopod appears to lack any natural predators. The water is too deep (15-26 cm) for birds to reach them. They eat other
carnivorous
A carnivore , or meat-eater (Latin, ''caro'', genitive ''carnis'', meaning meat or "flesh" and ''vorare'' meaning "to devour"), is an animal or plant whose food and energy requirements derive from animal tissues (mainly muscle, fat and other sof ...
invertebrates themselves.
Reproduction
To determine if mating is worthwhile, male isopods engage in mate-guarding behavior. There are four main forms of mate guarding behavior: encounter, assessment, rejection, and guarding. During encounter, the male acknowledges a female but does not attempt to guard her. During assessment, the male grabs onto a female and moves his legs across her body for less than 15 seconds. Males will assess females on their backs by lifting them up with their legs. This allows them to better determine female body size. During rejection, a male will grab a female for longer than 15 seconds, but less than 5 minutes. During guarding, a male grabs onto a female for longer than 5 minutes.
Both isopod genders attempt to mate with large-bodied members of the opposite sex. For females, a large-bodied male is more likely to pass his survival genes on to offspring. This could help females to increase
reproductive success
Reproductive success is an individual's production of offspring per breeding event or lifetime. This is not limited by the number of offspring produced by one individual, but also the reproductive success of these offspring themselves.
Reproduct ...
, making large males more attractive.
Mate-guarding can inhibit female
fecundity
Fecundity is defined in two ways; in human demography, it is the potential for reproduction of a recorded population as opposed to a sole organism, while in population biology, it is considered similar to fertility, the natural capability to pr ...
, so females have evolved counter-
adaptations
In biology, adaptation has three related meanings. Firstly, it is the dynamic evolutionary process of natural selection that fits organisms to their environment, enhancing their evolutionary fitness. Secondly, it is a state reached by the ...
against male mate-guarding. These include resistance against guarding, hiding from
suitors
Courtship is the period wherein some couples get to know each other prior to a possible marriage. Courtship traditionally may begin after a betrothal and may conclude with the celebration of marriage. A courtship may be an informal and private m ...
, and
sperm storage.
Habitat
The Socorro isopod lives in warm aquatic habitats.
They like environmental temperatures ranging from 26–33 °C (79–91 °F). They are
endemic
Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...
to the thermal waters of Socorro Spring in
Socorro County
Socorro County is a county in the U.S. state of New Mexico. As of the 2010 census, the population was 17,866. The county seat is Socorro. The county was formed in 1852 as one of the original nine counties of New Mexico Territory. Socorro wa ...
in
New Mexico
)
, population_demonym = New Mexican ( es, Neomexicano, Neomejicano, Nuevo Mexicano)
, seat = Santa Fe
, LargestCity = Albuquerque
, LargestMetro = Tiguex
, OfficialLang = None
, Languages = English, Spanish ( New Mexican), Navajo, Ker ...
,
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
.
The smaller
juveniles and
adult
An adult is a human or other animal that has reached full growth. In human context, the term ''adult'' has meanings associated with social and legal concepts. In contrast to a " minor", a legal adult is a person who has attained the age of major ...
females are commonly found residing on
vegetation
Vegetation is an assemblage of plant species and the ground cover they provide. It is a general term, without specific reference to particular taxa, life forms, structure, spatial extent, or any other specific botanical or geographic character ...
. This serves as a hiding place from the larger males that could cannibalize them. Meanwhile, adult males are commonly found living directly on the bottom
sediments
Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles. For example, sand a ...
. They often
burrow
An Eastern chipmunk at the entrance of its burrow
A burrow is a hole or tunnel excavated into the ground by an animal to construct a space suitable for habitation or temporary refuge, or as a byproduct of locomotion. Burrows provide a form of sh ...
beneath the
substrate during the
day and emerge again later on at
dusk
Dusk occurs at the darkest stage of twilight, or at the very end of astronomical twilight after sunset and just before nightfall.''The Random House College Dictionary'', "dusk". At predusk, during early to intermediate stages of twilight, enou ...
.
Range
The Socorro isopod was formerly endemic to the Sedillo Spring near Socorro County, New Mexico, USA. In 1947, the spring waters were diverted to provide the city of Socorro with drinking water. This forced the isopods to only live in a single old water
pipeline
Pipeline may refer to:
Electronics, computers and computing
* Pipeline (computing), a chain of data-processing stages or a CPU optimization found on
** Instruction pipelining, a technique for implementing instruction-level parallelism within a s ...
in the city. In 1988, a tree root caused the pipeline to burst, resulting in the
extinction
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...
of the wild population. The only surviving isopods were from
captive
Captive or Captives may refer to:
Arts, entertainment, and media Films
* ''Captive'' (1980 film), a sci-fi film, starring Cameron Mitchell and David Ladd
* ''Captive'' (1986 film), a British-French film starring Oliver Reed
* ''Captive'' (1991 ...
communities. These have since been
reintroduced
Species reintroduction is the deliberate release of a species into the wild, from captivity or other areas where the organism is capable of survival. The goal of species reintroduction is to establish a healthy, genetically diverse, self-sustainin ...
back into the pipeline, where a wild population still resides today. There are also captive populations in the SIPF,
ABP, the
Minnesota Zoo
The Minnesota Zoo (formerly the Minnesota Zoological Garden), is an AZA-accredited zoo in Apple Valley, Minnesota. It is one of two state-supported zoos in the United States, with the other being the North Carolina Zoo. When it opened on May 22, ...
, the
New Mexico Department of Game and Fish
The New Mexico Department of Game and Fish (NMDGF) is a state-level government department within the New Mexico Governor's Cabinet that is responsible for maintaining wildlife and fish in the state. The NMDGF undertakes protection, conservation and ...
Laboratory in Santa Fe, and the Department of Biology at
New Mexico Tech
The New Mexico Institute of Mining and Technology (New Mexico Tech and formerly New Mexico School of Mines) is a public university in Socorro, New Mexico. It offers over 30 bachelor of science degrees in technology, the sciences, engineering, man ...
.
Conservation
Population Size
The historical population size of the Socorro isopod is unknown. Their current population size of the wild population is about 2,500 isopods. The ABP also houses 300 individuals in 5 large tanks that continually
reproduce
Reproduction (or procreation or breeding) is the biological process by which new individual organisms – "offspring" – are produced from their "parent" or parents. Reproduction is a fundamental feature of all known life; each individual org ...
and are
self-sustaining
Self-sustainability and self-sufficiency are overlapping states of being in which a person or organization needs little or no help from, or interaction with, others. Self-sufficiency entails the self being enough (to fulfill needs), and a self-s ...
.
Past and Current Geographical Distribution
The Socorro isopod used to be
endemic
Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...
to the Sedillo Spring near
Socorro County
Socorro County is a county in the U.S. state of New Mexico. As of the 2010 census, the population was 17,866. The county seat is Socorro. The county was formed in 1852 as one of the original nine counties of New Mexico Territory. Socorro wa ...
,
New Mexico
)
, population_demonym = New Mexican ( es, Neomexicano, Neomejicano, Nuevo Mexicano)
, seat = Santa Fe
, LargestCity = Albuquerque
, LargestMetro = Tiguex
, OfficialLang = None
, Languages = English, Spanish ( New Mexican), Navajo, Ker ...
,
USA
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...
. It now resides on a pipeline constructed in 1947 to provide the city with water. There are also various captive populations residing in the SIPF, ABP, the Minnesota Zoo, the New Mexico Department of Game and Fish (NMDGF) Laboratory in Santa Fe, and the Department of Biology at New Mexico Tech.
The city of Socorro, in collaboration with the
United States Fish and Wildlife Service
The United States Fish and Wildlife Service (USFWS or FWS) is an agency within the United States Department of the Interior dedicated to the management of fish, wildlife, and natural habitats. The mission of the agency is "working with othe ...
(USFWS) and the NMDGF, constructed the SIPF. This artificial habitat was constructed near the isopod’s native habitat. It attempts to best replicate its natural environmental conditions. It consists of 8 artificial pools connected by pipes. Controlled propagation of isopods began at the facility in 1990. 600 isopods were introduced to the facility, with 75 isopods per pool.
Major Threats
The main threat to the Socorro isopod is disruption of thermal
groundwater
Groundwater is the water present beneath Earth's surface in rock and soil pore spaces and in the fractures of rock formations. About 30 percent of all readily available freshwater in the world is groundwater. A unit of rock or an unconsolidate ...
discharge. This disruption results from woody root growth,
surface mining
Surface mining, including strip mining, open-pit mining and mountaintop removal mining, is a broad category of mining in which soil and rock overlying the mineral deposit (the overburden) are removed, in contrast to underground mining, in which ...
, explosive tests on nearby
Department of Defense Department of Defence or Department of Defense may refer to:
Current departments of defence
* Department of Defence (Australia)
* Department of National Defence (Canada)
* Department of Defence (Ireland)
* Department of National Defense (Philipp ...
lands, and human
vandalism
Vandalism is the action involving deliberate destruction of or damage to public or private property.
The term includes property damage, such as graffiti and defacement directed towards any property without permission of the owner. The term f ...
.
Vandalism in particular has become a worsening threat to the
species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...
.
From 1995 to 2002, this vandalism included damaging, diverting or blocking the spring’s water flow, removal of vegetation, destruction of protective concrete walls around the spring, and pollution from the abandonment of a
junk car near the spring.
Listing under the ESA
The
IUCN Red List
The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is the world's most comprehensive inventory of the global conservation status of biol ...
lists the Socorro isopod as
extinct in the wild
A species that is extinct in the wild (EW) is one that has been categorized by the International Union for Conservation of Nature as known only by living members kept in captivity or as a naturalized population outside its historic range due ...
(EW). This listing is likely out of date since the isopod was last assessed on August 1, 1996. Based on the five-year review from the USFWS the isopod is likely
Vulnerable (VU).
It was the first
crustacean
Crustaceans (Crustacea, ) form a large, diverse arthropod taxon which includes such animals as decapods, seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, amphipods and mantis shrimp. The crustacean group ...
ever listed on the endangered species list.
Five-year Review
The Socorro isopod was native to a spring in Socorro, New Mexico. This spring was converted to a
bathhouse
Public baths originated when most people in population centers did not have access to private bathing facilities. Though termed "public", they have often been restricted according to gender, religious affiliation, personal membership, and other cr ...
in the early 1900s. Some isopods still live in the bathhouse remains, but the natural habitat no longer exists. Little is known about the conditions in which the isopod evolved. In 1988, a
drought
A drought is defined as drier than normal conditions.Douville, H., K. Raghavan, J. Renwick, R.P. Allan, P.A. Arias, M. Barlow, R. Cerezo-Mota, A. Cherchi, T.Y. Gan, J. Gergis, D. Jiang, A. Khan, W. Pokam Mba, D. Rosenfeld, J. Tierney, an ...
destroyed the wild population, but a captive population at the University of New Mexico was present and was
reintroduced
Species reintroduction is the deliberate release of a species into the wild, from captivity or other areas where the organism is capable of survival. The goal of species reintroduction is to establish a healthy, genetically diverse, self-sustainin ...
to the bathhouse. To protect against future drought harming the isopod, water was diverted to the SIPF outside the city.
ABP also houses 300 individuals in 5 large tanks that continually
reproduce
Reproduction (or procreation or breeding) is the biological process by which new individual organisms – "offspring" – are produced from their "parent" or parents. Reproduction is a fundamental feature of all known life; each individual org ...
and are
self-sustaining
Self-sustainability and self-sufficiency are overlapping states of being in which a person or organization needs little or no help from, or interaction with, others. Self-sufficiency entails the self being enough (to fulfill needs), and a self-s ...
.
Species Status Assessment
Not available at this point.
Recovery Plan
The Socorro isopod is currently protected by the USFWS. Permits are being issued to protect this species.
A
recovery plan was even written and approved in 1982, before they became
extinct
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...
in the wild. Captive populations have been established to secure the future of the isopod. They are held in the SIPF, which was constructed as a collaboration between the city of
Socorro, the
USFWS
The United States Fish and Wildlife Service (USFWS or FWS) is an agency within the United States Department of the Interior dedicated to the management of fish, wildlife, and natural habitats. The mission of the agency is "working with othe ...
, and the
New Mexico Department of Game and Fish
The New Mexico Department of Game and Fish (NMDGF) is a state-level government department within the New Mexico Governor's Cabinet that is responsible for maintaining wildlife and fish in the state. The NMDGF undertakes protection, conservation and ...
. This is an artificial habitat constructed outside the isopod’s native habitat in order to best replicate its natural environmental conditions. Controlled propagation of isopods began at the facility in 1990. Further captive populations are present in the
ABP,
New Mexico Tech
The New Mexico Institute of Mining and Technology (New Mexico Tech and formerly New Mexico School of Mines) is a public university in Socorro, New Mexico. It offers over 30 bachelor of science degrees in technology, the sciences, engineering, man ...
, and the New Mexico Department of Game and Fish laboratory.
References
External links
Survivor of Ancient Sea Is Joining ‘Endangered’ ListThe Socorro Isopod Swims Upside-Down But Crawls Right-Side{{Taxonbar, from=Q1428605
Sphaeromatidae
Crustaceans described in 1897
Socorro County, New Mexico
Crustaceans of the United States
Freshwater crustaceans of North America
Endemic fauna of New Mexico
Taxonomy articles created by Polbot