Annual variation in parental care in smallmouth bass,Micropterus dolomieu |
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Authors: | Mark S Ridgway Trevor G Friesen |
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Institution: | (1) Ontario Ministry of Natural Resources, Research Section, Fisheries Branch, Box 5000, Maple, Ontario, L6A 1S9, Canada;(2) Department of Biology, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada;(3) Present address: Department of Zoology, University of Guelph, Guelph, Ontario, N1G 2W1, Canada |
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Abstract: | Synopsis An eight year field study is summarized outlining variation in parental care in a northern population of smallmouth bass. Nesting makes ranged in age from 4 to 12 + years old and ranged in size from 21 cm to 40 + cm in fork length. The age and size distributions were skewed right when strong year-classes entered the nesting stock. Larger makes had more offspring in their nests than smaller makes. The year-to-year variation in the duration of care was large and appears to be related to two general effects of water temperature. First, there was a significant positive relationship between the variation in spring spawning date and variation in the duration of parental care prior to swim-up of the larvae. This reflects the general effect of spring warming rate on the timing of nesting in each year. Second, in most years, there was a significant positive relationship between male size and the duration of parental care prior to swim-up. This reflects the consistent inverse relationship between male size and the seasonal timing of spawning in this population. The offspring of large makes spawning early in a season take longer to develop than offspring of makes nesting late in season. There is no relationship in most years between male size and duration of care after swim-up. Other factors unrelated to water temperature may be important in determining the duration of care after swim-up. In particular, ontogenetic changes in juvenile behaviour and energy depletion in nesters may be two important factors affecting care duration. |
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Keywords: | Centrarchidae Temperature Year-class Nesting success Body size Parental investment Bioenergetics |
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