Sinnatamby, R Niloshini; Babaluk, John A; Power, Geoff; Reist, James D; Power, Michael (2012): Habitat preferences, fork lengths and isotopic ratios of Arctic charr (Salvelinus alpinus) in and around Lake Hazen, Ellesmere Island [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.837055, Supplement to: Sinnatamby, RN et al. (2012): Summer habitat use and feeding of juvenile Arctic charr, Salvelinus alpinus, in the Canadian High Arctic. Ecology of Freshwater Fish, 21(2), 309-322, https://doi.org/10.1111/j.1600-0633.2012.00552.x
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Abstract:
Owing to limited knowledge of the habitat use and diet of juvenile Arctic charr from the High Arctic, particularly young-of-the-year (YOY), we assembled data obtained from samples taken in and around Lake Hazen, Nunavut, Canada, to assess juvenile habitat use and feeding. Juvenile charr demonstrated a preference for stream environments, particularly those fed by warm upstream ponds. Charr occupying both stream and nearshore lake habitats were found to feed similarly, with chironomids occurring most frequently in diets. Some older stream-dwelling charr preyed on smaller, younger Arctic charr. Preferred stream occupancy is likely mediated by physical barriers created mainly by water velocity, and by distance from the lake, lake-ice dynamics, low water depth, and turbidity. Water velocities resulted in stream habitat segregation by size, with YOY mainly found in low-velocity pools and back eddies adjacent to stream banks, but not in water velocities >0.1 m/s. Greatest charr densities in streams were found in small, shallow, slow-flowing side channels, which are highly susceptible to drought. Under predicted climate change scenarios, streams fed by small ponds will be susceptible to intermittent flow conditions, which could result in increased competition among juvenile charr for the remaining stream habitats. In addition, glacier-fed streams are likely to experience increased flow conditions that will exacerbate physical barriers created by water velocity and further reduce the availability of preferred stream habitat.
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Coverage:
Median Latitude: 81.805923 * Median Longitude: -71.033153 * South-bound Latitude: 81.679700 * West-bound Longitude: -72.360300 * North-bound Latitude: 81.905300 * East-bound Longitude: -69.838400
Date/Time Start: 2007-08-04T00:00:00 * Date/Time End: 2008-08-12T00:00:00
Comment:
Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Sinnatamby, RN; Babaluk, JA; Power, G et al. (2012): (Table 2) Fork lengths, and δ¹³C and d15N values for Arctic charr (Salvelinus alpinus) from the Lake Hazen area, Ellesmere Island. https://doi.org/10.1594/PANGAEA.837054
- Sinnatamby, RN; Babaluk, JA; Power, G et al. (2012): (Table 1) Habitat types, number of Arctic charr (Salvelinus alpinus) captured, water temperatures and selection index values of charr in Lake Hazen, Ellesmere Island. https://doi.org/10.1594/PANGAEA.837053