Abstract
The inheritance of mobility and positioning characteristics of F1 and back-cross hybrids of lake charr (Salvelinus namaycush) and brook charr (S. fontinalis) was investigated. Hybrids showed a closer affinity to brook charr for mobility measurements in that they spent more total time stationary in periods of longer duration than did the lake charr. This suggests either a directional dominance or a response to water flow. Lake, brook, and reciprocal hybrid charr held mean positions within the central section of the water column and did not vary significantly from each other in their mean vertical positions. However, there were significant differences in mean horizontal coordinates across charr types in that lake charr and F1 hydrids occupied positions midway along a laboratory stream channel, while brook charr occupied downstream positions. Even though there were no significant differences between the parental species in either means or standard errors of vertical and horizontal positioning, hybrid phenotypes varied significantly from both parents. Reciprocal effects were observed for variability of horizontal positions. A bivariate ANOVA revealed that horizontal measures were of greater importance than vertical measures in discriminating between charr types. It is likely that both genetic and environmental factors are responsible for the characteristic differences in mobility and positioning between brook and lake charr.
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This study was supported by grants to DLGN by the Ontario Ministry of Natural Resources, the Natural Sciences and Engineering Research Council of Canada and the University of Guelph. Personal support to the senior author was provided by a University of Guelph Bursary Scholarship and an Ontario Graduate Scholarship. Fish were provided by the Ontario Ministry of Natural Resources, with the particular cooperation of Dr. Peter Ihssen of the Maple Research Station. Sincere appreciation also goes to P. Graf at Hill's Lake FCS and G. W. Martin at Maple. The constructive comments of an anonymous referee were also appreciated.
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Ferguson, M.M., Noakes, D.L.G. Movers and stayers: Genetic analysis of mobility and positioning in hybrids of lake charr,Salvelinus namaycush, and brook charr,S. fontinalis (Pisces, salmonidae). Behav Genet 13, 213–222 (1983). https://doi.org/10.1007/BF01065670
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DOI: https://doi.org/10.1007/BF01065670