Contrivance with purpose?: International relations and the reconstitution of the international
- Authors: Bischoff, Paul, 1954-
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/161480 , vital:40631
- Description: In observing and plotting the dialectics of how our present world works, fragmenting as it integrates we struggle in wanting to pin down a moving target! Unlike the world of science with its physical laws, the social nature of the world and its relations across borders keep changing course with social and transnational relations constantly mutating. This makes it rather difficult to plot the complexity of human relations, also those across borders. As the late Nobel Laureate Herbert Simon once said, the social sciences are, after all, the really ‘hard’ sciences. They are so hard because they are so hard to explain.
- Full Text:
- Date Issued: 2010
- Authors: Bischoff, Paul, 1954-
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/161480 , vital:40631
- Description: In observing and plotting the dialectics of how our present world works, fragmenting as it integrates we struggle in wanting to pin down a moving target! Unlike the world of science with its physical laws, the social nature of the world and its relations across borders keep changing course with social and transnational relations constantly mutating. This makes it rather difficult to plot the complexity of human relations, also those across borders. As the late Nobel Laureate Herbert Simon once said, the social sciences are, after all, the really ‘hard’ sciences. They are so hard because they are so hard to explain.
- Full Text:
- Date Issued: 2010
Natural enemies from South Africa for biological control of Lagarosiphon major (Ridl.) Moss ex Wager (Hydrocharitaceae) in Europe
- Baars, Jan-Robert, Coetzee, Julie A, Martin, Grant D, Hill, Martin P, Caffrey, J M
- Authors: Baars, Jan-Robert , Coetzee, Julie A , Martin, Grant D , Hill, Martin P , Caffrey, J M
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/76914 , vital:30637 , https://doi.org/10.1007/s10750-010-0427-0
- Description: The non-native invasive plant, Lagarosiphon major (Hydrocharitaceae) is a submersed aquatic macrophyte that poses a significant threat to water bodies in Europe. Dense infestations prove difficult to manage using traditional methods. In order to initiate a biocontrol programme, a survey for natural enemies of Lagarosiphon was conducted in South Africa. Several phytophagous species were recorded for the first time, with at least three showing notable promise as candidate agents. Amongst these, a leaf-mining fly, Hydrellia sp. (Ephydridae) that occurred over a wide distribution causes significant leaf damage despite high levels of parasitism by braconid wasps. Another yet unidentified fly was recorded mining the stem of L. major. Two leaf-feeding and shoot boring weevils, cf. Bagous sp. (Curculionidae) were recorded damaging the shoot tips and stunting the growth of the stem. Several leaf-feeding lepidopteran species (Nymphulinae) were frequently recorded, but are expected to feed on a wide range of plant species and are not considered for importation before other candidates are assessed. The discovery of several natural enemies in the country of origin improves the biological control prospects of L. major in Europe.
- Full Text:
- Date Issued: 2010
- Authors: Baars, Jan-Robert , Coetzee, Julie A , Martin, Grant D , Hill, Martin P , Caffrey, J M
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/76914 , vital:30637 , https://doi.org/10.1007/s10750-010-0427-0
- Description: The non-native invasive plant, Lagarosiphon major (Hydrocharitaceae) is a submersed aquatic macrophyte that poses a significant threat to water bodies in Europe. Dense infestations prove difficult to manage using traditional methods. In order to initiate a biocontrol programme, a survey for natural enemies of Lagarosiphon was conducted in South Africa. Several phytophagous species were recorded for the first time, with at least three showing notable promise as candidate agents. Amongst these, a leaf-mining fly, Hydrellia sp. (Ephydridae) that occurred over a wide distribution causes significant leaf damage despite high levels of parasitism by braconid wasps. Another yet unidentified fly was recorded mining the stem of L. major. Two leaf-feeding and shoot boring weevils, cf. Bagous sp. (Curculionidae) were recorded damaging the shoot tips and stunting the growth of the stem. Several leaf-feeding lepidopteran species (Nymphulinae) were frequently recorded, but are expected to feed on a wide range of plant species and are not considered for importation before other candidates are assessed. The discovery of several natural enemies in the country of origin improves the biological control prospects of L. major in Europe.
- Full Text:
- Date Issued: 2010
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