Growth Benefit from Habitat Change by Juvenile High-Arctic Char

Gulseth, Odd A.; Nilssen, Kjell Tormod

doi:10.1577/1548-8659(1999)128<0593:gbfhcb>2.0.co;2

Cited by 11 publications

(25 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The variance in experienced temperatures as estimated from the otoliths was significantly higher for zone 1 compared with the three subsequent zones, suggesting that YOY Arctic charr use a wider variety of thermal habitats than older juveniles. In Svalbard watercourses, all age classes of juveniles are captured in the lakes as well as in the rivers, except YOY Arctic charr that have not been found in rivers (Gulseth & Nilssen 1999). Individual Arctic charr may use a variety of habitats during their lifetime, with juveniles inhabiting both lakes and rivers (Power et al 2008).…”

Section: Discussionmentioning

confidence: 99%

“…In the Dieset watercourse, the river temperature, recorded approximately 2.5 km downstream from the lake, has been found to be significantly correlated with air temperature between mid-June and early September in 2007 and 2008 (Godiksen et al 2011). According to Gulseth & Nilssen (1999), migration to the river is possible as soon as the river opens, which occurred from 18 to 24th of June in 1991-1993, and more than 50% of the migrating parr entered the river within the first 48 h after opening of the river. According to Gulseth & Nilssen (1999), migration to the river is possible as soon as the river opens, which occurred from 18 to 24th of June in 1991-1993, and more than 50% of the migrating parr entered the river within the first 48 h after opening of the river.…”

Section: Discussionmentioning

confidence: 99%

“…The majority of the parr in the Dieset system do not return to the lake until the beginning of September (Gulseth & Nilssen 1999), thus, spending most of the ice-free period in the river. River-migrating fish may therefore experience higher temperatures during the first part of the summer, when the lake is still completely or partly ice-covered.…”

Section: Discussionmentioning

confidence: 99%

“…In South Dieset Lake, the ice along the shores begins to thaw in late June or early July (Svenning & Gullestad 2002), and this may result in a moat of open water while the rest of the lake is still ice-covered (Vincent et al 2008). Higher growth has been found among river-migrating parr than for resident conspecifics of Arctic charr (Jensen 1994;Gulseth & Nilssen 1999). The time of ice-break and opening to the river may therefore be of high importance for growth among Dieset Arctic charr.…”

Section: Discussionmentioning

confidence: 99%

“…1). Lakes are typically ice-free from July ⁄ August to mid-September (Gulseth & Nilssen 1999;Svenning & Gullestad 2002). The watercourse consists of a main river and seven lakes, among which North Dieset Lake (2.2 km 2 , max.…”

Section: Study Areamentioning

confidence: 99%

See 4 more Smart Citations

Thermal habitat use and juvenile growth of Svalbard Arctic charr: evidence from otolith stable oxygen isotope analyses

Godiksen

Power

Borgstrøm

et al. 2011

Ecology of Freshwater Fish

View full text Add to dashboard Cite

Stable oxygen isotopes (d 18 O) derived from otoliths were used to estimate mean annual water temperatures experienced by individual Svalbard Arctic charr, Salvelinus alpinus (L.), during their first four growth seasons. The analysed Arctic charr experienced a high variety of temperatures, indicating the use of different thermal habitats. A higher proportion of the juveniles experienced warmer temperatures during their first summer compared with later summers, suggesting the selective use of the shallowest littoral areas of the lake. Although the estimated temperatures were consistent with water temperatures found in High Arctic rivers and lakes during summer, they did not represent the annual variation in air temperature registered over the 20 years of otolith measurement. Furthermore, summer otolith increment width did not correlate with the experienced temperature. However, after the second year, otolith increment width was highly dependent on increment width during the previous summer. This study estimated mean summer water temperatures experienced by individual Arctic charr during the first four growth seasons providing additional evidence that stable oxygen isotope analysis can be used to provide insight into the thermal habitat use by juvenile Arctic charr.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

See 3 more Smart Citations

Thermal habitat use and juvenile growth of Svalbard Arctic charr: evidence from otolith stable oxygen isotope analyses

Godiksen

Power

Borgstrøm

et al. 2011

Ecology of Freshwater Fish

View full text Add to dashboard Cite

show abstract

References

2001

Migration of Freshwater Fishes

View full text Add to dashboard Cite

Summer habitat use and feeding of juvenile Arctic charr, Salvelinus alpinus, in the Canadian High Arctic

Sinnatamby

Babaluk

Power

et al. 2012

Ecology of Freshwater Fish

View full text Add to dashboard Cite

– 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−1. 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.

show abstract

Growth Benefit from Habitat Change by Juvenile High-Arctic Char

Cited by 11 publications

References 26 publications

Thermal habitat use and juvenile growth of Svalbard Arctic charr: evidence from otolith stable oxygen isotope analyses

Thermal habitat use and juvenile growth of Svalbard Arctic charr: evidence from otolith stable oxygen isotope analyses

References

Summer habitat use and feeding of juvenile Arctic charr, Salvelinus alpinus, in the Canadian High Arctic

Contact Info

Product

Resources

About