| 1. |
- Cherevatova, M., et al.
(författare)
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Magnetotelluric array data analysis from north-west Fennoscandia
- 2015
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Ingår i: Tectonophysics. - : Elsevier BV. - 0040-1951 .- 1879-3266. ; 653, s. 1-19
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Tidskriftsartikel (refereegranskat)abstract
- New magnetotelluric (MT) data in north-west Fennoscandia were acquired within the framework of the project "Magnetotellurics in the Scandes" (MaSca). The project focuses on the investigation of the crustal and upper mantle lithospheric structure in the transition zone from stable Precambrian cratonic interior to passive continental margin beneath the Caledonian orogen and the Scandinavian Mountains in western Fennoscandia. An array of 59 synchronous long period and 220 broad-band MT sites was occupied in the summers of 2011 to 2013. We estimated MT transfer functions in the period range from 0.003 to 10(5) s. The Q-function multi-site multi-frequency analysis and the phase tensor were used to estimate strike and dimensionality of MT data. Dimensionality and strike analyses indicate generally 2-D behaviour of the data with 3-D effects at some sites and period bands. In this paper we present 2-D inversion of the data, 3-D inversion models are shown in the parallel paper. We choose to invert the determinant of the impedance tensor to mitigate 3-D effects in the data on our 2-D models. Seven crustal-scale and four lithospheric-scale 2-D models are presented. The resistive regions are images of the Archaean and Proterozoic basement in the east and thin Caledonian nappes in the west. The middle and lower crust of the Svecofennian province is conductive. The southern end of the Kittila Greenstone Belt is seen in the models as a strong upper to middle crustal conductor. In the Caledonides, the highly conductive alum shales are observed along the Caledonian Thrust Front. The thickest lithosphere is in the Palaeoproterozioc Svecofennian Domain, not in the Archaean. The thickness of the lithosphere is around 200 km in the north and 300 km in the south-west.
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| 2. |
- Moore, A, et al.
(författare)
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The role of F-series prostaglandins as reproductive priming pheromones in the brown trout
- 2002
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Ingår i: Journal of Fish Biology. - 0022-1112 .- 1095-8649. ; 60:3, s. 613-624
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Tidskriftsartikel (refereegranskat)abstract
- Electrophysiological studies demonstrated that the olfactory epithelium of mature male brown trout Salmo trutta parr was acutely sensitive to F-series prostaglandins (PGFS) PGF(1alpha) and PGF(2alpha), with detection threshold concentrations of 10(-11) M. The olfactory epithelium was also sensitive to the PGF metabolite 15-ketoPGF(2alpha) (threshold 10(-8) M), but did not detect a further metabolite, 13,14,-dihydro-15-ketoPGF(2alpha). Immature brown trout did not detect any of the prostaglandins tested. Exposure of mature male brown trout parr to waterborne PGF(1alpha) and PGF(2alpha) (concentration 10(-8) M). resulted in significant increases in levels of expressible milt and the plasma concentrations of 17,20-betadihydroxy-4-pregnen-3-one, testosterone and 11-ketotestosterone. The olfactory epithelium of both immature and mature male brown trout parr was sensitive to the urine and ovarian fluid from ovulated female brown trout. Exposure of mature male brown trout parr to ovarian fluid resulted in an increase in the levels of plasma 17,20beta-dihydroxy-4-pregnen-3-one whilst exposure to urine increased the levels of expressible milt. In addition, PGF(2alpha) was found to be present within both the urine and ovarian fluid of mature female brown trout. It is suggested that the F-series prostaglandins have a role as priming pheromones in male brown trout.
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| 3. |
- Seppa, T, et al.
(författare)
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Early familiarity has fitness consequences for Arctic char (Salvelinus alpinus) juveniles
- 2001
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Ingår i: CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES. - : NATL RESEARCH COUNCIL CANADA. - 0706-652X. ; 58:7, s. 1380-1385
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Tidskriftsartikel (refereegranskat)abstract
- Familiarity is an important factor reducing aggressiveness among individuals. Because of the reduced energy and time expenditure due to lowered aggression, individuals would be expected to perform better in groups of familiar conspecifics as compared with
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