Divergent growth patterns between juveniles of two sympatric Arctic charr morphs with contrasting depth gradient niche preferences
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| 024 | 7 | 0 | |a 10.1007/s10452-015-9502-y |2 doi |
| 035 | |a (NATIONALLICENCE)springer-10.1007/s10452-015-9502-y | ||
| 245 | 0 | 0 | |a Divergent growth patterns between juveniles of two sympatric Arctic charr morphs with contrasting depth gradient niche preferences |h [Elektronische Daten] |c [Rune Knudsen, Helge Johnsen, Bjørn-Steinar Sæther, Sten Siikavuopio] |
| 520 | 3 | |a Seasonal growth patterns have been investigated in juveniles of two reproductively isolated Arctic charr [Salvelinus alpinus (L.)] morphs, which coexist in distinct ecological niches (upper-water and deep-water environments) in a subarctic lake. Offspring (F1-generation) of each of the littoral spawning charr (LO) and the profundal spawning charr (PB) were reared individually over a period of 12months under simulated natural photoperiod (at 69°N) and two different temperature regimes to mimic the profundal zone conditions with constantly low temperature (~4°C) and the littoral zone conditions with seasonally cycling temperatures. All charr increased in weight during the experimental period. The LO-morph performed generally best at naturally fluctuating temperature, whereas the PB-morph grew best at a constantly low temperature (4°C). The LO-morph showed a typical seasonal growth pattern found earlier for anadromous Arctic charr, with elevated specific growth rates (SGR) during June-October and profoundly reduced or negative SGR-values during November-February suggesting that the fish ceased feeding during this period. In contrast, the PB-morph maintained a steady growth rate, regardless of temperature regime, and showed less signs of reduced appetite during the polar night period and exhibited significantly higher SGR-values during late autumn and early winter compared to the LO-morph. This study suggests different heritable adaptations in somatic growth trajectories where the deep-water PB-morph do not show a down-regulation of appetite and voluntary fasting during winter conditions with typically low light intensity and low temperatures, and up-regulation of appetite with hyperphagia during summer, as characteristically found for the upper-water LO-morph and anadromous Arctic charr. | |
| 540 | |a Springer Science+Business Media Dordrecht, 2015 | ||
| 690 | 7 | |a Salvelinus alpinus |2 nationallicence | |
| 690 | 7 | |a Experimental |2 nationallicence | |
| 690 | 7 | |a Seasonality |2 nationallicence | |
| 690 | 7 | |a Growth |2 nationallicence | |
| 690 | 7 | |a Cold-water adaptation |2 nationallicence | |
| 700 | 1 | |a Knudsen |D Rune |u Department of Arctic and Marine Biology, University of Tromsø, 9037, Tromsö, Norway |4 aut | |
| 700 | 1 | |a Johnsen |D Helge |u Department of Arctic and Marine Biology, University of Tromsø, 9037, Tromsö, Norway |4 aut | |
| 700 | 1 | |a Sæther |D Bjørn-Steinar |u Nofima-marin, 9291, Tromsö, Norway |4 aut | |
| 700 | 1 | |a Siikavuopio |D Sten |u Nofima-marin, 9291, Tromsö, Norway |4 aut | |
| 773 | 0 | |t Aquatic Ecology |d Springer Netherlands |g 49/1(2015-03-01), 33-42 |x 1386-2588 |q 49:1<33 |1 2015 |2 49 |o 10452 | |
| 856 | 4 | 0 | |u https://doi.org/10.1007/s10452-015-9502-y |q text/html |z Onlinezugriff via DOI |
| 898 | |a BK010053 |b XK010053 |c XK010000 | ||
| 900 | 7 | |a Metadata rights reserved |b Springer special CC-BY-NC licence |2 nationallicence | |
| 908 | |D 1 |a research-article |2 jats | ||
| 949 | |B NATIONALLICENCE |F NATIONALLICENCE |b NL-springer | ||
| 950 | |B NATIONALLICENCE |P 856 |E 40 |u https://doi.org/10.1007/s10452-015-9502-y |q text/html |z Onlinezugriff via DOI | ||
| 950 | |B NATIONALLICENCE |P 700 |E 1- |a Knudsen |D Rune |u Department of Arctic and Marine Biology, University of Tromsø, 9037, Tromsö, Norway |4 aut | ||
| 950 | |B NATIONALLICENCE |P 700 |E 1- |a Johnsen |D Helge |u Department of Arctic and Marine Biology, University of Tromsø, 9037, Tromsö, Norway |4 aut | ||
| 950 | |B NATIONALLICENCE |P 700 |E 1- |a Sæther |D Bjørn-Steinar |u Nofima-marin, 9291, Tromsö, Norway |4 aut | ||
| 950 | |B NATIONALLICENCE |P 700 |E 1- |a Siikavuopio |D Sten |u Nofima-marin, 9291, Tromsö, Norway |4 aut | ||
| 950 | |B NATIONALLICENCE |P 773 |E 0- |t Aquatic Ecology |d Springer Netherlands |g 49/1(2015-03-01), 33-42 |x 1386-2588 |q 49:1<33 |1 2015 |2 49 |o 10452 | ||