. The Canadian field-naturalist. Natural history. 2003 Haxton: Movement of Lake Sturgeon in Ottawa River 543. Figure 1. Lower portion of Allumette Lake (Ottawa River) with Lake Sturgeon tracking locations identified. occasions. And sturgeon 140 was located at the top of Lower Allumette Rapids in March of 1999 and 2001. Lake Sturgeon were not tracked within 52 km of the dam. The average distance moved between trackings was km. The maximum distance traveled between trackings was km by Lake Sturgeon 820 bet- ween 13 July and 10 August. Average movement bet- ween seasons was not significa
. The Canadian field-naturalist. Natural history. 2003 Haxton: Movement of Lake Sturgeon in Ottawa River 543. Figure 1. Lower portion of Allumette Lake (Ottawa River) with Lake Sturgeon tracking locations identified. occasions. And sturgeon 140 was located at the top of Lower Allumette Rapids in March of 1999 and 2001. Lake Sturgeon were not tracked within 52 km of the dam. The average distance moved between trackings was km. The maximum distance traveled between trackings was km by Lake Sturgeon 820 bet- ween 13 July and 10 August. Average movement bet- ween seasons was not significantly different (ANOVA 3,101, F = , P = ). Average home range for the four Lake Sturgeon was 1528 ha (Table 2). Lake Sturgeon were generally found in shallow water; mean depth was ( ) m. There was variation in mean depth of Lake Sturgeon between seasons (Figure 2); however, these differences were not significant (ANOVA31()5, F = , P = ). Lake Sturgeon were sometimes located in areas with water depths up to 12 m. Discussion In contrast to the findings of McKinley et al. (1998), Lake Sturgeon in the present study did not move extensively throughout the reach but displayed high fidelity to the one particular basin, sometimes leaving the basin but returning later. Homing or site fidelity by Lake Sturgeon has previously been described (Threader and Brousseau 1986; Fortin et al. 1993; Rusak and Mosindy 1997; Auer 1999; Caswell et al. 2004). This area of the river is characterized by a sandy, clay sub- strate, which should be productive for benthic inver- tebrates, the primary source of prey for sturgeon. Juvenile sturgeon will remain in areas where there is Table 2. Average home range average movement, number of times tracked mcl last date Hacked for e ich Lake Sturgeon Sturgeon number Number of times tracked Home range(ha) Average movement (km) 1 asi date Hacked 140 240 320 820 26 32 23 29 1645 1066 1348 2054 25 May 2001 25 May 2001 25 M
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