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International Journal of Tropical Insect Science

, Volume 25, Issue 3, pp 214–217 | Cite as

Diversity and feeding behaviour of insects visiting Brachiaria ruziziensis (Poaceae)

  • Léonard S. T. NgamoEmail author
  • Fernand N. F. Tchuenguem
  • Gladys Mbofung
Short Communication

Abstract

The diversity of visitors to flowers of the grass Brachiaria ruziziensis R. Germ and Evrard is very low in Ngaoundéré, Cameroon. Bees (Hymenoptera) and syrphids (Diptera) were observed gathering pollen, and each insect group had its own strategy depending on the prevailing environmental conditions. Syrphids are early-morning flower visitors and take time to feed on wet pollen. They visit flowers from 0630 h when the relative humidity is higher than 80% and temperature lower than 25°C Bees gather dry pollen from 0930 h when the relative humidity is < 50% and temperature > 30°C, and carry it to the nests for feeding.

Key words

pollen collection anthophilous insects Brachiaria ruziziensis syrphids bees temperature relative humidity Cameroon Poaceae 

Résumé

La diversité de l’entomofaune floricole de Brachiaria ruziziensis R. Germ et Evrard est pauvre à Ngaoundéré au Cameroun. Les abeilles (Hymenoptera) et les syrphes (Diptera) exploitent le pollen de cette graminée. Les syrphes sont des visiteurs du point du jour se nourrissant du pollen humide et ils sont plus actifs à 6h30 quand l’humidité relative est supérieure à 80% et la température moins de 25°C Les abeilles qui sont actives après 9h30, (humidité relative < 50% et température > 30°C), collectent du pollen sec et l’emportent.

Mots clés

pollen insectes floricoles Brachiaria ruziziensis paturage température Poacée Cameroun 

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Copyright information

© ICIPE 2005

Authors and Affiliations

  • Léonard S. T. Ngamo
    • 1
    Email author
  • Fernand N. F. Tchuenguem
    • 1
  • Gladys Mbofung
    • 1
  1. 1.Department of Biological Sciences, Faculty of SciencesUniversity of NgaoundéréNgaoundéréCameroon

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