+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

The natural control of salmon and trout populations in streams

, : The natural control of salmon and trout populations in streams. Fisheries Research Amsterdam ; 62(2): 111-125

This paper reviews current understanding of factors controlling salmonid populations in streams and how this contributes to better fisheries management. Salmonid populations are regulated by density-dependent mortality, typically during the early stages of free-living life after fry emerge from spawning gravels. After the early regulatory phase, mortality is controlled mainly by density-independent factors. The relative contributions of density-dependent and density-independent factors to population variability are outlined, noting the special importance of environmental impacts such as flow and temperature extremes. Stock-recruitment relationships are discussed, with an emphasis on understanding the uncertainties and risks inherent in modelling wild populations. Key subjects for future research are identified. The challenge for science in the future lies in two areas: first, incorporating uncertainties into population modelling and management decision making, and second improving the understanding of processes regulating populations through long term studies.


DOI: 10.1016/s0165-7836(02)00157-1

Other references

Pal'tsyn, A.A.; Kolokol'chikova, E.G.; Grishina, I.A.; Chervonskaia, N.V.; Badikova, A.K.; Popova, E.P., 1994: The effect of antibodies to microorganisms in a focus of purulent inflammation. The rats were infected with a suspension of dissociated or agglutinated Pseudomonas aeruginosa [correction of B. pynocyaneus]. Infection with the agglutinated agent drastically improved the clinical course, lowered the indices of the process gener...

Unterrainer, J.M.; Ruff, C.C.; Rahm, B.; Kaller, C.P.; Spreer, J.; Schwarzwald, R.; Halsband, U., 2005: The influence of sex differences and individual task performance on brain activation during planning. Several studies have attempted to identify the neuronal basis of sex differences in cognition. However, group differences in cognitive ability rather than genuine neurocognitive differences between the sexes may account for their results. Here, we...

Gourie-Devi, M.; Suresh, T.G., 1988: Madras pattern of motor neuron disease in South India. This paper presents the clinical features in 12 patients with the Madras pattern of motor neuron disease (MMND) seen over a period of 10 years. Ten of the patients were from other parts of South India, outside Madras. Young age at onset, sporadic...

Kettunen, R.H.; Pulkkinen, E.M.; Rintala, J.A., 1996: Biological treatment at low temperatures of sulfur-rich phenols containing oil shale ash leachate. Aerobic and sequential anaerobic-aerobic treatment of oil shale ash dump leachate (COD 2000-3000 mg l-1) was studied at 7-10 degree and at 20 degree C. The leachate was known to contain several phenolic compounds and have a high sulfur concentrati...

Butkevich, V.S., 1932: Methods of bacteriological investigation and some distributional data on bottom and water bacteria of the Barents Sea. A brief description is given of an apparatus devised for taking water samples. Bottom samples were taken by means of an Eckman's tube. Counts on a fish-peptone gelatine medium with subsequent liquefying by the method of Hiltner-Stormer gave 1...

Donnelly, J.G., 1998: Homocysteine and plasma folate relationship in patients with venous thrombosis, end-stage renal disease or atherosclerosis. Clinical Chemistry 44(6 PART 2): A167-A168, June

Barr, David, 1996: The development of HIV treatment education programs in community-based organization in New York City. ELEVENTH INTERNATIONAL CONFERENCE ON AIDS [Author] Eleventh International Conference on AIDS, Vol Two One world: One hope : 433

Maier, W.; Lichtermann, D.; Franke, P.; Heun, R.; Falkai, P.; Rietschel, M., 2002: The dichotomy of schizophrenia and affective disorders in extended pedigrees. The paper reports the first controlled family study investigating not only 1st but also 2nd and 3rd degree relatives of patients with schizophrenia by direct diagnostic interviews. Regardless of their degree of relationship, all biological relativ...

Ihering, H.V., 1877: Zur Kenntniss der Eibildung bei den Muscheln. Zeitschrift fuer Wissenschaftliche Zoologie, XXIX 1-14

Lazennec, J-Y.; Charlot, N.; Gorin, M.; Roger, B.; Arafati, N.; Bissery, A.; Saillant, G., 2003: Hip-spine relationship: a radio-anatomical study for optimization in acetabular cup positioning. The criteria for acetabular cup positioning during total hip replacement are a matter of considerable discussion, particularly with regards to the optimal degree of anteversion. "Anatomical anteversion" is defined in the transverse plane...