Fine structure and elemental composition of envelopes of 10 taxa of Trachelomonas and Strombomonas from natural freshwater bodies in China were studied and phylogeny of both genera were discussed. The results indicate...Fine structure and elemental composition of envelopes of 10 taxa of Trachelomonas and Strombomonas from natural freshwater bodies in China were studied and phylogeny of both genera were discussed. The results indicate that iron (Fe) and silicon (Si) are the primary mineral elements of the envelopes. Composition of mineral elements was uncorrelated with envelope color, however, it was highly correlated with the microarchitecture of the envelopes. Content of Si was higher than that of Fe in all species of Strombomonas and some species of Trachelomonas with rough surface. In most species of Trachelomonas, especially those with dense and smoothy surface, content of Fe was higher than that of Si. Based on the above results, we propose to assign those species of Strombomonas into Trachelomonas and consider them as a group of the latter. These species were the most primitive among the group with envelopes in Euglenaceae.展开更多
991576 热带湖中水华的控制:某些草食性鱼类的摄食率=Control of bloom in a tropi-cal lake:grazing efficiency or some herbivo-rous fishes[刊,英]/Datt(Saha)S,JanaB B//J.Fish Biol..—1998,53(1).—12～24利用沼泽栅栏研究,在持...991576 热带湖中水华的控制:某些草食性鱼类的摄食率=Control of bloom in a tropi-cal lake:grazing efficiency or some herbivo-rous fishes[刊,英]/Datt(Saha)S,JanaB B//J.Fish Biol..—1998,53(1).—12～24利用沼泽栅栏研究,在持久蔓延以微囊藻属 Microcystis 水华的富养浅水湖中测试了鲢、鳙和罗非鱼摄食的微囊藻。将每种鱼的12尾鱼种一式三份引进到放置在湖中的沼泽栅栏,直到沼泽栅栏水华实际下降并保持不变的期间测试其摄食效果。不管哪种鱼,将鱼引进到沼泽栅栏的结果是最初的微囊藻群体到3或7d 急剧减少(60%～93%)。展开更多
文摘Fine structure and elemental composition of envelopes of 10 taxa of Trachelomonas and Strombomonas from natural freshwater bodies in China were studied and phylogeny of both genera were discussed. The results indicate that iron (Fe) and silicon (Si) are the primary mineral elements of the envelopes. Composition of mineral elements was uncorrelated with envelope color, however, it was highly correlated with the microarchitecture of the envelopes. Content of Si was higher than that of Fe in all species of Strombomonas and some species of Trachelomonas with rough surface. In most species of Trachelomonas, especially those with dense and smoothy surface, content of Fe was higher than that of Si. Based on the above results, we propose to assign those species of Strombomonas into Trachelomonas and consider them as a group of the latter. These species were the most primitive among the group with envelopes in Euglenaceae.
文摘991576 热带湖中水华的控制:某些草食性鱼类的摄食率=Control of bloom in a tropi-cal lake:grazing efficiency or some herbivo-rous fishes[刊,英]/Datt(Saha)S,JanaB B//J.Fish Biol..—1998,53(1).—12～24利用沼泽栅栏研究,在持久蔓延以微囊藻属 Microcystis 水华的富养浅水湖中测试了鲢、鳙和罗非鱼摄食的微囊藻。将每种鱼的12尾鱼种一式三份引进到放置在湖中的沼泽栅栏,直到沼泽栅栏水华实际下降并保持不变的期间测试其摄食效果。不管哪种鱼,将鱼引进到沼泽栅栏的结果是最初的微囊藻群体到3或7d 急剧减少(60%～93%)。
