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- Romare, Pia, et al.
(författare)
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Variation in spatial and temporal gradients in zooplankton spring development: the effect of climatic factors
- 2005
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Ingår i: Freshwater Biology. - : Wiley. - 0046-5070 .- 1365-2427. ; 50:6, s. 1007-1021
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Tidskriftsartikel (refereegranskat)abstract
- 1. We examined the temporal and spatial heterogeneity of zooplankton in lake surface waters during the spring of 3 years in Lake Washington, U.S.A., a large lake with a high production of sockeye salmon fry. 2. We show large within-season and among-year variation in the horizontal distribution of temperature, chlorophyll a concentration, and zooplankton in the lake. The main pattern, a delay in zooplankton population increase from the north- to the south-end of the lake, recurred in each year and was persistent within each spring. 3. The delay is primarily caused by the development of a temperature gradient during spring warming, as cold mountain water enters the south end of the lake, while warm water enters the north end via a river draining a nearby lake. Climate factors, such as air temperature and precipitation during winter and spring, appear to influence the extent of the delay of zooplankton increase. 4. If the climate continues to warm, the temporal disconnection in zooplankton development between lake areas immediately influenced by cold river inflow and areas that are influenced by spring warming may increase in magnitude. Thus, the different areas of the lake may not contribute equally to fish production.
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- Berglund, Mats, et al.
(författare)
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Amount and consequences of alcohol drinking are modulated by ever using cigarettes and cannabis : a comparison between Sweden and US
- 2013
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Ingår i: Alcohol and Alcoholism. - : Oxford University Press. - 0735-0414 .- 1464-3502. ; 48:S1, s. i20-i21
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Background. To study effects of ever used cigarettes or cannabis on amount and consequences of alcohol drinking. The ATLAS Project is a long-term longitudinal study comparing the development of substance use from high school to the young adult life period (18-23 years) in the US and Sweden. Methods. Baseline data for 3352 17-19 year-old students (65% from Sweden, 35% from US). Measurements: Questionnaire AUDIT-C, Rutgers Alcohol Problem Index, RAPI, ever use of marijuana, cigarettes and alcohol, onset of alcohol drinking, Conduct problems, SCL-8, Impulsivity. Results. The patterns of ever use differed distinctly between the two countries. In US 35% had never used alcohol, 17% had used alcohol and cannabis, 4% alcohol and cigarettes and 22% alcohol, cannabis and cigarettes. Corresponding figures in Sweden were 7%, 1%, 48% and 17%, respectively. Sweden had higher scores on AUDIT C and RAPI than US in the first three groups. In hierarchical multiple regression analyses on AUDIT C early drinking onset, conduct problems and impulsivity had about the same positive effects. Sweden, ever use of cigarettes and marijuana were all significantly related. Marijuana influenced less in Sweden than in the US. In hierarchical multiple regression analyses on RAPI conduct problems had a very strong effect. Sweden, cigarettes and marijuana were all significantly related. Cigarettes influenced less on consequences of drinking in Sweden than in the US. Conclusions. Sweden and the US differed in important aspects on modulating effects of cannabis and cigarettes on alcohol drinking. Supported by a grant from NIAAA/NIH for Larimer/Berglund.
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