Notropis topeka

Geographic Range

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 nearctic
  • native native

Habitat

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 temperate
• freshwater freshwater

• Aquatic Biomes
• lakes and ponds
• rivers and streams
• temporary pools

Physical Description

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.

• Other Physical Features
• ectothermic ectothermic
• heterothermic heterothermic
• bilateral symmetry bilateral symmetry

• Sexual Dimorphism
• male larger

Development

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.

Reproduction

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 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.

• Key Reproductive Features
• semelparous semelparous
• seasonal breeding seasonal breeding
• sexual sexual
• fertilization fertilization
  • external external
• oviparous oviparous

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

• Parental Investment
• pre-fertilization
  • provisioning
  • protecting
    • female

Lifespan/Longevity

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

Behavior

Topeka shiners are diurnal and highly territorial. There is no further information available regarding the general behavior of this species.

• Key Behaviors
• natatorial natatorial
• diurnal diurnal
• motile motile
• territorial territorial

Home Range

There is no information available regarding the average home range size of Topeka shiners.

Communication and Perception

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 tactile
• chemical chemical

Food Habits

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.

• Primary Diet
• omnivore omnivore

• Animal Foods
• fish
• insects
• aquatic crustaceans

• Plant Foods
• seeds, grains, and nuts

• Other Foods
• detritus detritus

Predation

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

Ecosystem Roles

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 biodegradation

Economic Importance for Humans: Positive

Topeka shiners may be used as feed for stock fish.

• Positive Impacts
• food food

Economic Importance for Humans: Negative

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

Conservation Status

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.

Additional Links

Encyclopedia of Life

BioKIDS Critter Catalog

Contributors

Jessica Sellner (author), Minnesota State University, Mankato, Robert Sorensen (editor), Minnesota State University, Mankato, John Berini (editor), Animal Diversity Web Staff, Catherine Kent (editor), Special Projects.

References

Berry Jr., C., C. Blausey, J. Jenks, C. Kopplin, S. Wall. 2004. Fish-habitat modeling for gap analysis to conserve the endangered Topeka shiner (Notropis topeka). Canadian Journal of Fisheries & Aquatic Sciences , 61(6): 954-973.

Churchill, E., W. Over. 1933. Fishes of South Dakota. The South Dakota Department of Fish and Game : 87pp.

Cross, F., J. Collins. 1995. Fishes in Kansas. University of Kansas Natural History Museum, Educational Series , 3: 315pp.

Cross, F. 1967. Handbook of fishes of Kansas. Miscellaneous Publications of the Museum of Natural History, University of Kansas , 45: 1-357.

Dahle, S. 2001. Studies of Topeka shiner (Notropis topeka) life history and distribution in Minnesota. M. S. Thesis, University of Minnesota, St. Paul .

Elsen, D. 1977. Distribution of fishes in the James River in North Dakota and South Dakota prior to Garrison and Oahe Diversion Projects. M. S. Thesis, University of North Dakota, Grand Forks : 86pp.

Evermann, B., U. Cox. 1896. A report upon the fishes of the Missouri River basin. Report of United States Commision of Fish and Fisheries , 1894: 325-429.

Hatch, J. 2002. Topeka shiner (Notropis topeka). Fishes of Minnesota .

Hatch, J. 2001. What we know about Minnesota's first endangered fish species: the Topeka shiner. Journal of the Minnesota Academy of Science , 65(1): 39-46.

Heins, D. 1990. Field evidence for multiple clutches in the longnose shiner. Copeia , 1990: 579-582.

Katula, R. 1998. Eureka Topeka! (Shiners, that is). Tropical Fish Hobbyist .

Kerns, H. 1983. Aspects of the life history of the Topeka shiner, Notropis topeka (Gilbert), in Kansas. unpublished manuscript .

Michl, G., E. Peters. 1993. New distribution record of the Topeka shiner in Loup Drainage basin in Nebraska. Prairie Naturalist , 25: 51-54.

Minckley, W., F. Cross. 1959. Distribution, habitat, and abundance of the Topeka shiner Notropis topeka (Gilbert) in Kansas. American Midland Naturalist , 61: 210-217.

Pflieger, W. 1971. A distributional study of Missouri fishes. Museum of Natural History , 20: 225-570.

Robins, C. 1991. Common and scientific names of fishes from the United States and Canada. Am. Fish. Soc. Spec. Pub. , 20: 183.