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  • 1.
    Berg, Henrik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolutionsbiologi, Ekologisk botanik.
    Differential seed dispersal in Oxalis acetosella, a cleistogamous perennial herb2000Inngår i: Acta Oecologica, ISSN 1146-609X, E-ISSN 1873-6238, Vol. 21, nr 2, s. 109-118Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Explosive seed dispersal in the cleistogamous perennial forest herb Oxalis acetosella was studied during two growing seasons, to determine whether seeds derived from chasmogamous (CH) and cleistogamous (CL) flowers differ in dispersal distance. Seed dispersal distance, seed weight, and height of fruits were measured for both flower types, and the effects of phenology and year were also taken into account. The dispersal experiment was performed indoors, using plants transplanted from natural populations to pots. CL seeds were thrown significantly further than were CH seeds, though there was a considerable overlap in dispersal distances. There was also a significant positive relationship between seed weight and dispersal distance. No relationship was found between fruit height and dispersal distance. The results of this study contradict the common view that CL progeny should always be dispersed closer to the mother plant than CH progeny. The ecological implications of the dispersal difference are unclear, especially since it is uncertain whether CH seeds are generally outcrossed or not. Variation in dispersal distance in O. acetosella seems to be mainly dependent on a combination of reproductive mode and variation in seed weight.

  • 2.
    Haussmann, Natalie
    et al.
    Stellenbosch University.
    McGeoch, Melodie
    Stellenbosch University.
    Boelhouwers, Jan
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Kulturgeografiska institutionen.
    Contrasting nurse plants and nurse rocks The spatial distribution of seedlings of two sub-Antarctic species: The spatial distribution of seedlings of two sub-Antarctic species2010Inngår i: Acta Oecologica, ISSN 1146-609X, E-ISSN 1873-6238, Vol. 36, nr 3, s. 299-305Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Positive plant interactions, such as those associated with nurse plants, have been suggested to dominate over negative interactions in environments with high abiotic stress. Here we demonstrate that the sub-Antarctic cushion plant species, Azorella selago (Apiaceae), positively affects the distribution of both its own seedlings and those of the perennial grass, Agrostis magellanica (Poaceae). As a result of the light weight and small size of seeds of both species, coupled with strong winds experienced in the study area, we consider it unlikely that these patterns are the result of very localized seed dispersal from the study cushions themselves. Instead, we suggest that both cushions and rocks act as seed traps, trapping seeds dispersed by wind, runoff and/or downslope sediment transport through frost creep. In addition, increased A. selago seedling numbers around cushions, but not around rocks, suggest that cushions provide a biological nurse effect, such as improving soil nutrient status or providing mychorrizae, to seedlings of their own kind.

  • 3.
    Mattsson, Elisabet
    et al.
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för folkhälso- och vårdvetenskap, Psykosocial onkologi och stödjande vård.
    Lindgren, Björn
    von Essen, Louise
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för folkhälso- och vårdvetenskap, Psykosocial onkologi och stödjande vård.
    Are there any positive consequences of childhood cancer?: A review of the literature2008Inngår i: Acta Oecologica, ISSN 1146-609X, E-ISSN 1873-6238, Vol. 47, nr 2, s. 199-206Artikkel, forskningsoversikt (Fagfellevurdert)
    Abstract [en]

    The aim was to investigate whether there are any positive consequences of childhood cancer. Studies published 1990-2005 reporting survivors' descriptions of positive consequences of childhood cancer were identified through a search in the databases CINAHL, PsycINFO, and PubMed. According to a manifest content analysis, positive consequences were referred to three themes: life values, relations to others, and relation to self. A second search in the same databases was conducted to identify studies investigating whether survivors of childhood cancer differ from comparison groups with regard to variables assigned to these themes. In these studies, no conclusions about positive consequences with regard to the theme life values can be drawn, as only one study was identified. In addition, only a small minority of findings from comparative studies indicate that childhood cancer has any positive consequences with regard to relations to others and relation to self. A majority of the results indicate that survivors do not differ from comparison groups, whereas some findings highlight that friendship and marital status are areas of concern, and parenthood and sexuality are areas of potential concern. It is recommended that survivors of childhood cancer are followed up by a multi-professional team, focusing not only on the survivors' health status but also on relations to family, friends, and partners.

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