Hunting organizations in cooperation with the Forest Service release thousands of artificially reared pheasants and partridges in Hellas (Greece). To evaluate the effectiveness of this practice a questionnaire was app...Hunting organizations in cooperation with the Forest Service release thousands of artificially reared pheasants and partridges in Hellas (Greece). To evaluate the effectiveness of this practice a questionnaire was applied to hunting wardens of four hunting federations in 2002 and one in 2011. Moreover data were obtained from the wildlife managers of one federation from 2009 to 2014. The release of hybrid pheasants and chukar partridges was conducted by the majority of local hunting clubs (H.C.). Most hunting wardens and wildlife managers stated that even during the most successful release only a small percentage (1% - 10%) of released birds can survive for more than three months and usually none of the released birds or a few achieve to rear chicks. However, repeated releases led to the establishment of small groups of birds in some areas, but without a serious benefit for hunting activity. In case of releases for hunting purposes (put and take), the respondents said that the majority (90%) of galliforms were killed by predators or hunters within a few days after release, and that only few (18 - 25) hunters harvested the survived birds. Until 2009, in northern and central mainland Hellas, the minimum cost per bird entering to the hunter’s bag was 143€. That amount is estimated to be 33.47€ in islands and after 2009 in mainland. In conclusion, the professionalism in galliforms releases should get improved with appropriate legal decisions and organization structures.展开更多
The invasive Q biotype whitefly was first detected in the US on poinsettia in 2004 and is still not a pest outside of greenhouse environments in the US. To assess the potential for the establishment of the Q biotype o...The invasive Q biotype whitefly was first detected in the US on poinsettia in 2004 and is still not a pest outside of greenhouse environments in the US. To assess the potential for the establishment of the Q biotype on field crops, population cage experiments were conducted to compare the performance of a poinsettia-derived Q population named P＇06 on poinsettia and six field crops （alfalfa, tomato, melon, cotton, cowpea and cabbage）. P＇06 adults reared on poinsettia as nymphs laid eggs on all six field crops. Significantly more eggs were laid on alfalfa, tomato, melon and cotton than on cabbage, cowpea and poinsettia. These eggs hatched and the nymphs developed to adults on the six field crops. Relative to poinsettia, whitefly survival was similar on cowpea, alfalfa, tomato and cabbage, but significantly higher on cotton and melon. Moreover, P＇06 had significantly shorter development times from egg to adult on cotton, melon, cowpea, tomato and alfalfa than they did on poinsettia. However, the F1 adults raised on the six field crops had significantly shorter lifespans and laid 11- to 18-fold fewer eggs than did the F1 adults raised on poinsettia. Taken together, while P＇06 may have some potential to establish on field crops, the shorter lifespans and extremely low fectmdities of the F1 adults raised on the six field crops suggests that P＇06 is incapable of rapidly adapting to them. Poor adaptation to field crops may explain, at least partially, why the Q biotype has not established in the US field system.展开更多
文摘Hunting organizations in cooperation with the Forest Service release thousands of artificially reared pheasants and partridges in Hellas (Greece). To evaluate the effectiveness of this practice a questionnaire was applied to hunting wardens of four hunting federations in 2002 and one in 2011. Moreover data were obtained from the wildlife managers of one federation from 2009 to 2014. The release of hybrid pheasants and chukar partridges was conducted by the majority of local hunting clubs (H.C.). Most hunting wardens and wildlife managers stated that even during the most successful release only a small percentage (1% - 10%) of released birds can survive for more than three months and usually none of the released birds or a few achieve to rear chicks. However, repeated releases led to the establishment of small groups of birds in some areas, but without a serious benefit for hunting activity. In case of releases for hunting purposes (put and take), the respondents said that the majority (90%) of galliforms were killed by predators or hunters within a few days after release, and that only few (18 - 25) hunters harvested the survived birds. Until 2009, in northern and central mainland Hellas, the minimum cost per bird entering to the hunter’s bag was 143€. That amount is estimated to be 33.47€ in islands and after 2009 in mainland. In conclusion, the professionalism in galliforms releases should get improved with appropriate legal decisions and organization structures.
文摘The invasive Q biotype whitefly was first detected in the US on poinsettia in 2004 and is still not a pest outside of greenhouse environments in the US. To assess the potential for the establishment of the Q biotype on field crops, population cage experiments were conducted to compare the performance of a poinsettia-derived Q population named P＇06 on poinsettia and six field crops （alfalfa, tomato, melon, cotton, cowpea and cabbage）. P＇06 adults reared on poinsettia as nymphs laid eggs on all six field crops. Significantly more eggs were laid on alfalfa, tomato, melon and cotton than on cabbage, cowpea and poinsettia. These eggs hatched and the nymphs developed to adults on the six field crops. Relative to poinsettia, whitefly survival was similar on cowpea, alfalfa, tomato and cabbage, but significantly higher on cotton and melon. Moreover, P＇06 had significantly shorter development times from egg to adult on cotton, melon, cowpea, tomato and alfalfa than they did on poinsettia. However, the F1 adults raised on the six field crops had significantly shorter lifespans and laid 11- to 18-fold fewer eggs than did the F1 adults raised on poinsettia. Taken together, while P＇06 may have some potential to establish on field crops, the shorter lifespans and extremely low fectmdities of the F1 adults raised on the six field crops suggests that P＇06 is incapable of rapidly adapting to them. Poor adaptation to field crops may explain, at least partially, why the Q biotype has not established in the US field system.
