مؤتمر
Biological characteristics of inland lake whitefish populations in Ontario.
| العنوان: | Biological characteristics of inland lake whitefish populations in Ontario. |
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| المؤلفون: | Haxton, Tim |
| المصدر: | Annual Conference on Great Lakes Research Abstract Book; 2023, Vol. 66, p84-85, 2p |
| مصطلحات موضوعية: | WHITEFISHES |
| مصطلحات جغرافية: | ONTARIO |
| مستخلص: | Contemporary biological characteristics for inland lake whitefish populations in Ontario are relatively unknown. Populations in the Great Lakes have declined from a synergy of perturbations, but it is unknown if the effects are landscape wide. A Broadscale Monitoring (BsM) program has been conducted within inland lakes in Ontario since 2008 in approximately five-year cycles on approximately 750 lakes. The objectives of this study were to assess the biological characteristics of lake whitefish within inland lakes at multiple scales and determine if there have been any changes in abundance spatially and temporally over 15 years. Since BsM's inception, 54 941 lake whitefish were sampled among 524 different waterbodies. Lake whitefish relative abundance of did not vary among cycles, however, varied among FMZs but not within a FMZ among cycles. They were more abundant in lakes with less species diversity, greater Secchi depth and mean depth, and higher levels of hypolimnetic dissolved oxygen. Abundance was greatest at the 12 - 35 m depth strata whereas the probability of catching a lake whitefish was greatest at the 12 - 20 m depth stratum. There was no spatial segregation based on size as the mean length did not vary among depth strata. Growth, age and size at maturity was similar between the sexes at the provincial and FMZ scale. Mean survival for populations with at least 50 lake whitefish sampled was 83%. The demographics and relative abundance of lake whitefish throughout inland lakes in Ontario is indicative there is currently limited exploitation on these populations. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: | Complementary Index |
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