Pollination Efficiency of <i>Ceratina cyanea</i>(Hymenoptera: Apidae) on <i>Helianthus annuus</i>(Asteraceae) Flowers at Dang (Ngaoundere, Cameroon)  

作　　者：Mohamadou Moussa Faïbawa Esaïe Mazi Sanda Mohamadou Moussa;Faïbawa Esaïe;Mazi Sanda(Department of Parasitology and Parasitic Pathologies, School of Science and Veterinary Medecine, University of Ngaoundere, Ngaoundere, Cameroon;Department of Biological Sciences, Faculty of Science, University of Ngaoundere, Ngaoundere, Cameroon;School of Geology and Mining Engineering at Meiganga, University of Ngaoundere, Ngaoundere, Cameroon)

机构地区：[1]Department of Parasitology and Parasitic Pathologies, School of Science and Veterinary Medecine, University of Ngaoundere, Ngaoundere, Cameroon [2]Department of Biological Sciences, Faculty of Science, University of Ngaoundere, Ngaoundere, Cameroon [3]School of Geology and Mining Engineering at Meiganga, University of Ngaoundere, Ngaoundere, Cameroon

出　　处：《Open Journal of Ecology》2022年第1期66-80,共15页生态学期刊（英文）

摘　　要：To evaluate the impact of <em>Ceratina cyanea</em> on fruit and seed yields of sunflower, experimental field was set up from June to July in 2016 and 2017 at Dang. Observations were done on 540 capitula divided in four treatments: two treatments differentiated according to the presence or absence of protection on capitula regarding<em> Ceratina cyanea</em> and other flowering insects’ visits;the third with capitula protected and uncovered when florets were opened, to allow <em>C. cyanea</em> visits and flowers bagged uncovered and rebagged without the visit of insects or any other organisms. Bee’s daily rhythm of activity, its foraging behavior on florets and its pollination efficiency were evaluated. Bee’s daily rhythm of activity, its foraging behavior on flowers and its pollination efficiency were evaluated. Results show that, <em>C. cyanea</em> foraged on <em>Helianthus annuus</em> flowers throughout its whole blooming period. Among 32 insect species recorded on <em>H. annuus</em> capitula, <em>C. cyanea</em> ranked second accounting for 10.79% all visits, after <em>Apis mellifera</em> (76.06%). On florets, individual bees intensely harvested nectar and slightly collected pollen. The mean duration of a visit per floret was 3.62 sec for nectar harvest and 9.58 sec for pollen collection. For the two years, through its pollination efficiency on <em>H. annuus</em>, <em>C. cyanea</em> has increased the fruiting rate by 65.90%, the percentage of fruit with seed by 63.56% and the percentage of normal seeds by 76.11%. Based on these results, we recommend the protection of <em>C. cyanea</em> nests at the vicinity of sunflower fields to increase its fruit and seed yields in the Adamaoua Region of Cameroon.To evaluate the impact of <em>Ceratina cyanea</em> on fruit and seed yields of sunflower, experimental field was set up from June to July in 2016 and 2017 at Dang. Observations were done on 540 capitula divided in four treatments: two treatments differentiated according to the presence or absence of protection on capitula regarding<em> Ceratina cyanea</em> and other flowering insects’ visits;the third with capitula protected and uncovered when florets were opened, to allow <em>C. cyanea</em> visits and flowers bagged uncovered and rebagged without the visit of insects or any other organisms. Bee’s daily rhythm of activity, its foraging behavior on florets and its pollination efficiency were evaluated. Bee’s daily rhythm of activity, its foraging behavior on flowers and its pollination efficiency were evaluated. Results show that, <em>C. cyanea</em> foraged on <em>Helianthus annuus</em> flowers throughout its whole blooming period. Among 32 insect species recorded on <em>H. annuus</em> capitula, <em>C. cyanea</em> ranked second accounting for 10.79% all visits, after <em>Apis mellifera</em> (76.06%). On florets, individual bees intensely harvested nectar and slightly collected pollen. The mean duration of a visit per floret was 3.62 sec for nectar harvest and 9.58 sec for pollen collection. For the two years, through its pollination efficiency on <em>H. annuus</em>, <em>C. cyanea</em> has increased the fruiting rate by 65.90%, the percentage of fruit with seed by 63.56% and the percentage of normal seeds by 76.11%. Based on these results, we recommend the protection of <em>C. cyanea</em> nests at the vicinity of sunflower fields to increase its fruit and seed yields in the Adamaoua Region of Cameroon.

关 键 词：Ceratina cyanea Helianthus annuus Pollination Efficiency YIELDS Dang 

分 类 号：Q14[生物学—生态学]