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- Cotes Ramal, Belén
(author)
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Spider Communities and Biological Control in Native Habitats Surrounding Greenhouses
- 2018
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In: Insects. - : MDPI AG. - 2075-4450. ; 9
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Journal article (peer-reviewed)abstract
- The promotion of native vegetation as a habitat for natural enemies, which could increase their abundance and fitness, is especially useful in highly simplified settings such as Mediterranean greenhouse landscapes. Spiders as generalist predators may also be involved in intra-guild predation. However, the niche complementarity provided by spiders as a group means that increased spider diversity may facilitate complementary control actions. In this study, the interactions between spiders, the two major horticultural pests, Bemisia tabaci and Frankliniella occidentalis, and their naturally occurring predators and parasitoids were evaluated in a mix of 21 newly planted shrubs selected for habitat management in a highly disturbed horticultural system. The effects of all factors were evaluated using redundancy analysis (RDA) and the generalized additive model (GAM) to assess the statistical significance of abundance of spiders and pests. The GAM showed that the abundance of both pests had a significant effect on hunter spider's abundance, whereas the abundance of B. tabaci, but not F. occidentalis, affected web-weavers' abundance. Ordination analysis showed that spider abundance closely correlated with that of B. tabaci but not with that of F. occidentalis, suggesting that complementarity occurs, and thereby probability of biocontrol, with respect to the targeted pest B. tabaci, although the temporal patterns of the spiders differed from those of F. occidentalis. Conservation strategies involving the establishment of these native plants around greenhouses could be an effective way to reduce pest populations outdoors.
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| 2. |
- Nyqvist, Fredrica, et al.
(author)
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Changes in active ageing in a Nordic regional context : Results based on the GERDA study in 2005 and 2016
- 2022
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In: International Journal of Social Welfare. - : Blackwell Publishing. - 1369-6866 .- 1468-2397. ; 31:1, s. 8-21
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Journal article (peer-reviewed)abstract
- The study examined changes in active ageing among 65/66- and 75/76-year-olds in northern Sweden and western Finland. Data were retrieved from a repeated cross-sectional survey conducted in 2005 and 2016. Logistic regression was used to estimate the probability of ageing actively in terms of employment, social and political participation, confidence in healthcare, economic situation, self-rated health and social contacts. The results showed no significant changes in employment, social participation or economic situation. However, the level of political participation and self-rated good health was significantly higher in 2016 compared with 2005, whereas confidence in healthcare and social contacts was lower. Considering that the implementation of active ageing policies relies heavily on municipal and/or regional level in our study region, our results could be used as a framework for regional policymaking.
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