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Publication: Intrafragment riverscape conservation for an imperiled, small-bodied, pelagic-broadcast spawning minnow: speckled chub (Macrhybopsis aestivalis)


Publication Date
Start Date
2015-07-30 05:00:00
End Date
2015-07-30 05:00:00


Christopher W. Hoagstrom(Author), Thomas P. Archdeacon(Author), Stephen R. Davenport(Author), David L. Propst(Author), James (Jim) E. Brooks(Author), Great Plains Landscape Conservation Cooperative(administrator), 2015-07-30(Publication), Publication: Intrafragment riverscape conservation for an imperiled, small-bodied, pelagic-broadcast spawning minnow: speckled chub (Macrhybopsis aestivalis),


Intrafragment ecology is little studied for imperiled riverine fishes although river fragmentation and habitat loss increasingly threaten sensitive species. A long-term population-monitoring program in the Pecos River, New Mexico, provided detailed data for 15 annual cohorts of speckled chub (Macrhybopsis aestivalis), which were used to assess intrafragment patterns in recruitment and year-class strength in relation to distributional patterns, flow-regime characteristics, and air temperature. Cohorts avoided a degraded upstream reach. Age-1 and older individuals had distributions consistently centered within a central, relict-ecosystem reach that contained high-quality habitat. Age-0 individuals were widespread within the relict-ecosystem [...]


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A persistent population of M. aestivalis occurs in a fragment of the Pecos River between the Fort Sumner Irrigation District (FSID) Diversion Dam and Brantley Reservoir, New Mexico (Hoagstrom et al. 2011). It has been subjected to extensive population sampling associated with monitoring to document the status of federally protected Pecos bluntnose shiner (Notropis simus pecosensis; Hoagstrom et al. 2008b). Because so little is known of the population ecology of M. aestivalis, other members of Extrarius, and other pelagic-broadcast spawning minnows, available flow-regime and air-temperature data were combined with available population data to document basic population dynamics and shed light on the four perceived conservation threats (above). Data were adequate to (i) assess distributional patterns within cohorts over time, (ii) document length-related patterns in depth and velocity use, and (iii) determine whether population density, flow-regime, or air temperature regulated cohort strength.

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journalCanadian Journal of Fisheries and Aquatic Sciences
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