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- Hoffsten, Per-Ola
(författare)
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Galvån : Ett riksintresseområde för naturvården, X 105
- 1992
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- RiksintressetRikedom av forsar och strömmar i kombination med vattendragets storlek utgör en ovanlig och därför värdefull miljö.Området utgör även en värdefull biotop för sårbart djurliv bl. a utter, nedströmsvandrande insjööring.Översvämningsbetingade våtmarksmiljöer med rik flora, bl. a Kung Karls spira, intressant strandflora invid sidofåror, samt en unik svampflora invid biflödet Nybobäcken.
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| 5. |
- Stridh, Bengt
(författare)
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Kläppaängarna, Ljusdal : Naturinventering 1992
- 1994
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Gävleborgs Botaniska Sällskap och Naturskyddsföreningen i Ljusdal har under 1992 hjort en naturinventering inom ca 6 km² på Kläppaängarna i Ljusdal på uppdrag av Ljusdals kommun. Kärlväxter, fåglar och insekter har i första hand inventerats. Aldre uppgifter har speciellt eftersökts. Djur och fjärilar utom dagfjärilar dokumenterades översiktlig.Sedan1997 ingår Kläppaängarna i det område längs Mellanljusnan som klassas som riksintressant för den vetenskapliga naturvården och det roliga friluftslivet i Naturresurslagen.Området har dock inte erhållit något skydd. Syftet med inventeringen var att dokumentera naturvärden som bakgrund för ett eventuellt bildande av naturvårdsområde eller naturreservat.
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| 7. |
- Andersson, Måns Sverker, et al.
(författare)
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Glycosylated haemoglobin: a new measure of condition in birds
- 1995
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Ingår i: Proceedings of the Royal Society of London. ; :260, s. 299-303
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Tidskriftsartikel (refereegranskat)abstract
- Abstract: The influence of condition on time of breeding and reproductive success has been discussed since Darwin first suggested a relation in 1871. We used a novel method to investigate the influence of condition on the timing of breeding and reproductive success by measuring a relatively inert physiological parameter - the amount of glycosylated haemoglobin - in blood samples taken from the collared flycatcher Ficedula albicollis. The percentage of glycosylated haemoglobin (%HbG) was assumed to be proportional to the average blood glucose level, during the 3-5 weeks before the blood sampling. The %HbG was influenced neither by sex nor age. Date of arrival at the breeding ground was negatively correlated with %HbG so that early-arriving birds had significantly higher %HbG than those arriving later. Clutch size, corrected for the effect of laying date, correlated positively with %HbG in females, as did the number of fledged young, corrected for the effect of laying date, for both sexes. We found no correlation between body mass and the %HbG. We suggest that prebreeding condition influences the timing of breeding and subsequent reproductive performance and that %HbG can be used as an indicator of prebreeding-condition in migrating birds.
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| 10. |
- Ekendahl, Anette, et al.
(författare)
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Shell colour variation in Littorina saxatilis Olivi (Prosobranchia : Littorinidae): a multi-factor approach
- 1997
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Ingår i: Biological Journal of the Linnean Society. - 0024-4066. ; 62:3, s. 401-419
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Tidskriftsartikel (refereegranskat)abstract
- The marine snail Littorina saxatilis is highly polymorphic for shell colour. It lives in the heterogeneous intertidal zone, where there are sharp transitions in a number of abiotic factors that may influence the relative fitness of morphs. We investigated the hypothesis of selected variation by relating the colour distribution to five factors (wave exposure, substratum, shore level, sex, snail age), and to interactions between them. We compared patterns from geographical areas in Sweden, Iceland and Russia. Cryptic morphs (tessellated and different dark colours) generally dominated (80-98%) while conspicuous morphs (white, yellow, red and banded) were less common (2-20%). The colour frequencies were often related to wave exposure, substratum and shore level. Frequencies rarely varied with age and never with sex. In order to test the assumption that the different colours are genetically determined we cross-bred snails from Iceland in the laboratory. Both the presence of bands and the ground colours of the shell were inherited, and we have tentative support for a one-locus two-allele model for banding. Our results support a model of selected inherited colour variation, involving a number of different selective agents, the importance of which may vary between populations on local and geographical scales. (C) 1997 The Linnean Society of London.
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