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Evidence of an adaptive basis for geographic variation in body morphology and time of downstream migration of juvenile atlantic salmon salmo salar


, : Evidence of an adaptive basis for geographic variation in body morphology and time of downstream migration of juvenile atlantic salmon salmo salar. Canadian Journal of Fisheries & Aquatic Sciences 38(3): 308-320

Differences in growth rate, proximate composition, body morphology and time of downstream migration between 2 populations inhabiting tributaries of the Miramichi River, New Brunswick [Canada], that differed in distance from the head of tide, temperature and flow velocity were studied. Rocky Brook, located 132.6 km above the head of tide, had lower temperatures and higher average flow velocities than the Sabbies River, located 42.5 km above tide. Growth rate and proximate composition were similar between populations, but body morphology and time of downstream migration differed significantly between populations. Individuals from Rocky Brook had more fusiform bodies and larger paired fins than their counterparts in Sabbies River. Rocky Brook fish also left the tributary in the fall rather than in the spring as was the case in Sabbies River. The generality of the flow regime-body morphology relationship observed was tested and confirmed by predicting differences in morphology of juvenile salmon in other rivers based on a knowledge of their flow regimes. Early migration by the Rocky Brook fish probably is related to the higher energetic costs of overwintering in that stream. The phenotypic similarity in growth rate and proximate composition and geographic variation in body morphology and timing of migration have an adaptive basis.

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Accession: 005411221

DOI: 10.1139/f81-042

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LoGiudice, K., 2006: Toward a synthetic view of extinction: a history lesson from a North American rodent. Although it is recognized that many factors interact to cause extinctions, it is difficult to consider multiple factors when investigating species declines. I conducted a post hoc exploration of the major hypotheses for the decline of the Alleghen...

Manhartsberger, C.; Norer, B., 1988: Follow-up of odontogenic cysts. Zeitschrift für Stomatologie 85(3): 171-177

Liu, A.; Xu, S.; Lu, C.; Peng, P.; Zhang, Y.; Feng, D.; Liu, Y., 2014: Anaerobic fermentation by aquatic product wastes and other auxiliary materials. The efficiency of the biogas production from aquatic product wastes was researched through the proportioning materials of nine part organic waste to one part rice straws, peanut hull powder or food wastes, respectively. Such four treatments were a...

Syverud S.A.; Dronen S.C.; Chudnofsky C.R.; Van Ligten P.F., 1989: A continuous hemorrhage model of fatal hemorrhagic shock in swine. We studied the effect of bleed rate on survival time and hemodynamics in a continuous hemorrhage model of fatal hemorrhagic shock in lightly anesthetized swine. Fasted immature swine (12-16 kg) were sedated with intramuscular (i.m.) ketamine, endo...

Black-Schaffer, R.M., 2003: Communication among levels of care for stroke patients. Stroke patients in the United States frequently progress through several different locations of care and groups of providers during the course of their recovery. Consistently effective communication from one level of care and one set of providers...

Ardissone, F.; Rapellino, M.; Obert, R.; Baldi, S.; Scappaticci, E.; Pecchio, F.; Borasio, P., 1989: Bronchial carcinoma in subjects under 40. We investigated a series of 30 patients younger than 40 years with histologically proven bronchogenic carcinoma. Most patients were symptomatic for a mean duration of 3 months before examination. The most common cell types were squamous carcinoma...

Benarous, A.; Jany, B.; Promelle, V.; Milazzo, S., 2016: Postoperative pseudo-exfoliative deposits on a posterior chamber intraocular lens. Journal Francais D'ophtalmologie 39(7): 653-654

Sun, W.; Wang, Q.; Li, H.; Wang, Y.; Okubo, S.; Shao, D.; Liu, D.; Fu, G., 2009: Gravity and GPS measurements reveal mass loss beneath the Tibetan Plateau; geodetic evidence of increasing crustal thickness. Today, some tens of million years after its creation by the collision between India and Asia, the Tibetan Plateau is the highest and largest plateau on Earth. Results of geological and tectonic studies indicate that the plateau is extending. Howev...

Shevchenko, L.A., 1997: Clinical characteristics of motor deficit in patients after hemispheric stroke. Correlation between clinical structure of motor deficit and indices of stimulation electromyography was studied in 108 patients with hemispheric stroke. Methods of statistic analysis were applied including devising of histograms, Pareto diagrams,...

Lefkowitz, R.J.; Roth, J.; Pricer, W.; Pastan, I., 1970: Acth receptors in the adrenal specific binding of acth iodine 125 and its relation to adenyl cyclase. Proceedings of the National Academy of Sciences of the United States of America 65(3): 745-752