ISSN:
1573-5133
Keywords:
Overwintering
;
Snorkeling
;
Water velocity
;
Condition factor
;
Body water
;
Winter stream management
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Synopsis The winter habitat of stream-dwelling blacknose dace Rhinichthys atratulus is identified and described from underwater observations in a southern Ontario stream. In late November as water temperatures declined below 5.0°C, dace moved into crevices beneath rubble with a mean maximum diameter of 15.9 cm. Focal point water depth was significantly greater in winter and mid-depth water velocity was significantly faster than measured in the summer. Dace were not observed in open water again until late March when water temperatures increased to 4.0°C. Winter diet analyses which showed minimal feeding were consistent with the seasonal changes in condition factor and percentage body water suggesting a general depletion of body reserves over winter. This physiological change was more pronounced in juveniles.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00000401
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