Plants and Animals

Coregonus bartlettii Siskiwit lake cisco

Key Characteristics

C. bartletti is considered to be either an intermediate form or the same species as C. zenithicus. See C. zenithicus for characterstics.

Status and Rank

US Status:
State Status: T - Threatened (legally protected)
Global Rank: G3THQ
State Rank: SH - Possibly extirpated

Occurrences

CountyNumber of OccurrencesYear Last Observed
Keweenaw11966

Information is summarized from MNFI's database of rare species and community occurrences. Data may not reflect true distribution since much of the state has not been thoroughly surveyed.

Habitat

Habitat is likely similar to the shortjaw lake cisco, found in a deep, cold water and spawning at depths of 36 to 73 m over clay substrates.

Specific Habitat Needs

Clay substrates needed in: Great Lake, Pelagic, Midwater.

Natural Community Types

  • Great lake, pelagic, midwater

For each species, lists of natural communities were derived from review of the nearly 6,500 element occurrences in the MNFI database, in addition to herbarium label data for some taxa. In most cases, at least one specimen record exists for each listed natural community. For certain taxa, especially poorly collected or extirpated species of prairie and savanna habitats, natural community lists were derived from inferences from collection sites and habitat preferences in immediately adjacent states (particularly Indiana and Illinois). Natural communities are not listed for those species documented only from altered or ruderal habitats in Michigan, especially for taxa that occur in a variety of habitats outside of the state.

Natural communities are not listed in order of frequency of occurrence, but are rather derived from the full set of natural communities, organized by Ecological Group. In many cases, the general habitat descriptions should provide greater clarity and direction to the surveyor. In future versions of the Rare Species Explorer, we hope to incorporate natural community fidelity ranks for each taxon.

Management Recommendations

Exotic species are a threat to this species. Manage introduced species to limit competition (e.g. alewife, rainbow smelt) or food web disruption (e.g. loss of Diporeia). Other threats include: habitat loss, contaminants, itrogressive hybridization with bloater (Houston 1988).

Active Period

Spawning from first week of May to fourth week of March

Survey Methods

Gill nets

Survey Period: From first week of November to fourth week of October

Trawls

Survey Period: From first week of November to fourth week of October

References

Survey References

  • Murphy, B.R. and D.W. Willis, eds. 1996. Fisheries Techniques, 2nd ed. American Fisheries Society, Bethesda. 732pp.

Technical References

  • Hubbs, C.L. and K.F. Lagler. 2004. Fishes of the Great Lakes region, revised edition. Rev.ed. G.R. Smith. The University of Michigan Press, Ann Arbor MI. 276pp.