Notropis topeka (Gilbert 1884)

There is no information available regarding communication and perception in Topeka shiners. However, as a fish, Topeka shiners have a lateral line system that helps them detect changes in pressure and temperature in the local environment.

Perception Channels: tactile ; chemical

Topeka shiners were placed on the US Fish and Wildlife Service list of endangered species in January of 1999 due to an 80% reduction in its abundance. Decline of the species is due to loss of habitat caused by siltation, channelization, and predation by stock fish. Other factors that have contributed to its declining population include increased sedimentation and eutrophication of prairie streams resulting from the rapidly growing agricultural industry. Other agricultural influences on this species include intensive cultivation, tiling, grazing, and irrigation, which results in unstable water levels, loss of aquatic vegetation, elevated temperatures, and an increase in turbidity. Populations in southeastern South Dakota and southwestern Minnesota appear to be stable. However, maps of predicted species distribution could have a number of immediate implications on the conservation and management of this species throughout its geographic range. This species is classified as near-threatened on the IUCN's Red List of Threatened Species.

US Federal List: endangered

CITES: no special status

State of Michigan List: no special status

IUCN Red List of Threatened Species: near threatened

Spawning season of wild Topeka shiners begins when water temperature reach 22°C. Captive populations begin spawning at temperatures ranging from 21.1°C. to 25.6°C. Evidence suggests an incubation period of 5 days at 22.2°C. Feeding begins soon after hatching and includes brine shrimp larvae. There is no further information available regarding development in Topeka shiners.

There are no known adverse effects of Notropis topeka on humans.

Topeka shiners may be used as feed for stock fish.

Positive Impacts: food

Topeka shiners help control insect pest species by preying on their aquatic larvae. As a detritivore, they may help break down decaying plant matter and provide accessible nutrients to the surrounding environment and community. Finally, this species is likely an important prey species for larger piscivorous fish throughout its geographic range.

Ecosystem Impact: biodegradation

Topeka shiners are often classified as an insectivore, based mostly on anecdotal accounts. Some studies suggest that Topeka shiners are a benthic insectivore, while other studies have noted the consumption of plant matter. Gut content analysis indicates a highly omnivorous diet that includes many kinds of microcrustaceans, invertebrates, larval fish, algae, vascular plant matter including seed capusles, detritus, and many species of aquatic insect larvae.

Animal Foods: fish; insects; aquatic crustaceans

Plant Foods: seeds, grains, and nuts

Other Foods: detritus

Primary Diet: omnivore

Topeka shiners are native to North America, specifically prairie streams in the central portion of the great plains. Today, Topeka shiners is absent from a majority of these streams. Presently, it occupies only 20% of its historical range, and is declining in Kansas, Missouri, Nebraska, and Iowa. It can also be found in South Dakota and Minnesota.

Biogeographic Regions: nearctic (Native )

Topeka shiners found in pond-like areas or isolated portions of streams that begin to evaporate during dry weather. Optimal pond habitat tends to be cool and clear with an abundance of vegetation and soft, muddy bottoms. Optimal stream habitat tends to have a flow rate of about 1.5 m^3 per second with mostly gravel bottoms. Rooted vegetation is not common in their habitat. They are not found in muddy streams that or those with highly intermittent flow rates. Extant populations in Missouri are restricted to tributaries of the Missouri River with a sufficient flow rate to prevent extensive deposition of silt. While these characteristics are preferred in Kansas and Missouri populations, in the northwestern portion of its range, they are found in periodically turbid waters whose sand, gravel or rubble bottoms are covered by 5cm or more of silt and detritus. Topeka shiners are often more abundant in off-channel oxbows and excavated pools than they are in main channel pools and runs. Seasonal studies of these habitats in Minnesota have shown that Topeka shiners can complete their entire life cycle in these habitats. Recent studies conducted in Minnesota have also shown it is even more common in this state than previously thought, however, it may be limited to the Missouri River drainage in the southwestern portion of the state.

Habitat Regions: temperate ; freshwater

Aquatic Biomes: lakes and ponds; rivers and streams; temporary pools

Like other Notropis species, the Topeka shiner lives for a maximum of 3 years.

Average lifespan
Status: wild: 3 years.

Typical lifespan
Status: wild: 3 (high) years.

Mean standard length of Topeka shiners is 34.6 mm for 12 month olds, 42.5 mm for 24 month olds and 53.2 cm for 36 month olds. Males grow more rapidly than females and are significantly larger than females by the time the reach adulthood. The average size of a year-one male or female is about 30 mm in total length. Males in their second year are about 47 mm total length compared to females which average 42 mm in length. At the end of year three, most males are about 69 mm long, and most females are around 47 mm long. Coloration may vary throughout its geographic range; however, most specimens have orangish heads and reddish-orange fins. The body is silver with a dark midline that ranges in color from grey-blue to black.

Range length: 7.6 (high) cm.

Average length: 4.5 cm.

Other Physical Features: ectothermic ; heterothermic ; bilateral symmetry

Sexual Dimorphism: male larger

Little is know of the major predators of Topeka shiners; however, largemouth bass are known to prey on this species.

Known Predators:

• largemouth bass (Micropterus salmoides)

Topeka shiners spawn from late May through July in Kansas and Missouri. Despite the more northern population distribution, studies of seasonal ovarian development have shown spawning seasons from early June to mid-August. Spawning begins when water temperatures reach 22°C. Topeka shiners spawn in pools over gravel and rubble substrates alongside green sunfish and orangespotted sunfish. Topeka shiners defend small territories, less than 0.25 m^2, near sunfish nests. Males defend their nests from both male and female intrusion, and only the most persistent females are able to lay their eggs in the males nest.

Mating System: polygynous

Most male and female Topeka shiners reach maturation by about 12 to 14 months of age, but the determining factor is likely size rather than age. Evidence suggests that males smaller than 47 mm in length and females less than 37 mm length are unable to spawn. Topeka shiners are multiple clutch spawners, meaning that they spawn more than once during each spawning season. This allows small fish with limited volume in their abdomen to produce a greater number of eggs during a season without having to overly decrease their per-capita egg size. Clutch size is significantly correlated with body size rather than age. Average clutch size was found to be 453 for all ages combined. Like other Notropis species, Topeka shiners live a maximum of 3 years, and mortality rates are high between age classes. One study showed 90%, 9.8%, and 0.2% mortality for age classes 0,1, and 2 respectively.

Breeding interval: Notropis topeka spawns once per year.

Breeding season: Spawning in Notropis topeka occurs from mid-May to mid-August.

Range number of offspring: 351 to 559.

Average number of offspring: 453.

Average gestation period: 4 days.

Range age at sexual or reproductive maturity (female): 12 to 14 months.

Range age at sexual or reproductive maturity (male): 12 to 14 months.

Key Reproductive Features: semelparous ; seasonal breeding ; sexual ; fertilization (External ); oviparous

Parental care has not been documented in Topeka shiners apart from development and fertilization of eggs.

Parental Investment: pre-fertilization (Provisioning, Protecting: Female)

Inhabits quiet gravel-bottomed and sand-bottomed pools of headwaters and creeks.

The Topeka shiner (Notropis topeka) is a North American species of cyprinid freshwater fish. The Topeka shiner is a type of minnow that does not grow longer than a few inches. This minnow is a shiny silver color its main physical characteristic is the black colored stripe that runs along the side of the body.

It is distributed in the Mississippi River basin, from southern Minnesota and southeastern South Dakota south to central Missouri and southern Kansas.

The Topeka shiner lives mainly in prairie streams. In order for the Topeka shiner to survive the water must be cold and clear. The streams in which this Minnow lives are typically consistent and run year long. In cases in which the stream does dry up, the Topeka Shiner needs to find a new stream or permanent body of water to survive.

The Topeka shiner was listed as Endangered by the U.S. Fish and Wildlife Service in 1998. The species is endangered primarily because of the water quality need. This species relies on clean water to survive. When the streams water quality changes the Topeka shiner has difficulty adjusting to the changes. The water quality can change due to both environmental and human impact. A main cause for the decline in population is human activity. The water quality changes and the minnow are impacted when natural plant life is taken away. Any type of construction such as road work, new homes and other types of development can affect the habitat in which the Topeka shiner lives.

Notropis topeka es una especie de peces de la familia de los Cyprinidae en el orden de los Cypriniformes.

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Notropis topeka Notropis generoko animalia da. Arrainen barruko Actinopterygii klasean sailkatzen da, Cyprinidae familian.