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| Gratecap, J.B.; Wezel, A.; Casagrande, Marion; Martin, P.. |
| Organic farming is considered as a solution to preserve water quality in drinking water catchments. For local managers of these catchments it is thus important to identify conventional farmers for potential conversion to organic farming. The aim of this article is to assess technical similarity of conventional farmers concerned by a water catchment to organic farming. We build a typology of farmers based on technical logics related to cropping systems organization. We differentiated five types of farmers among 18 conventional dairy farmers and three recently converted organic farmers. According to our results, only two farmers can be considered as close to technical logics identified in organic farms. Nevertheless, we could identify partial technical... |
| Tipo: Journal paper |
Palavras-chave: Farming Systems; Air and water emissions. |
| Ano: 2013 |
URL: http://orgprints.org/26278/1/Gratecap_2013_CIAG_Vol32.pdf |
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| Martin, P.; Dorn, N.J.; Kawai, T.; Heiden, C. van der; Scholtz, G.. |
| A mysterious parthenogenetic cambarid crayfish (the Marmorkrebs) has been spreading across the globe for the past decade. We compare this crayfish directly to two other cambarids, Procambarus fallax and P. alleni, that have been suggested to be related or even identical to the Marmorkrebs. Using external morphology and sequences of two mitochondrial genes we show clear correspondences between Marmorkrebs and P. fallax, a species found natively throughout peninsular Florida, USA. Based on these congruent results we suggest that the Marmorkrebs is the parthenogenetic form of P. fallax. This finding has potential evolutionary and ecological implications at several levels. The Marmorkrebs might be a type of geographical parthenogenesis, but a natural... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 12S rRNA; Annulus ventralis; COI; DNA barcoding; Species concept; Thelytoky; 42.74. |
| Ano: 2010 |
URL: http://www.repository.naturalis.nl/record/355212 |
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