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- Title
Individual-based analyses reveal high repeatability in timing and location of reproduction in lake sturgeon ( Acipenser fulvescens).
- Authors
Forsythe, Patrick S.; Crossman, James A.; Bello, Nora M.; Baker, Edward A.; Scribner, Kim T.; Tonn, William
- Abstract
Few studies have quantified the repeatability of reproductive decisions by individuals or assessed their relationship with environmental variables over multiple seasons for long-lived iteroparous fish species. Using individual-based data collected for 678 lake sturgeon ( Acipenser fulvescens) over 8 consecutive years, we evaluated hypotheses regarding spawning periodicity and repeatability of spawning location, spawning time, and environmental cues associated with spawning. At our study site (Upper Black River, northern Michigan, USA), interspawning interval differed between males (2.3 ± 0.08 years) and females (3.7 ± 0.16 years), but was not significantly related to age. Individual spawning behavior was highly repeatable with respect to spawning time (relative day within the spawning season) for both sexes regardless of size or age, but was less repeatable, though still significant, relative to water temperature, river discharge, and lunar phase. Breeding area was also repeatable, with individuals spawning earlier in the season selecting locations further upstream than those spawning later. Repeatability in spawning times and locations suggest that subpopulation differentiation may develop among different spawning groups, even within small and spatially contiguous areas.
- Subjects
LAKE sturgeon; FISH reproduction; SEASONAL physiological variations; FISH spawning; POPULATION differentiation; ACQUISITION of data; ANIMAL behavior; FISHES
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2012, Vol 69, Issue 1, p60
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/f2011-132