The Mauritanian Desert Locust Center Center National Of Lutte Antiacridienne Cnla

Nouakchott, Mauritania

The Mauritanian Desert Locust Center Center National Of Lutte Antiacridienne Cnla

Nouakchott, Mauritania
SEARCH FILTERS
Time filter
Source Type

Maeno K.O.,The Mauritanian Desert Locust Center Center National Of Lutte Antiacridienne Cnla | Piou C.,CIRAD - Agricultural Research for Development | Ould Ely S.,The Mauritanian Desert Locust Center Center National Of Lutte Antiacridienne Cnla | Babah M.A.O.,The Mauritanian Desert Locust Center Center National Of Lutte Antiacridienne Cnla | And 5 more authors.
Journal of Insect Behavior | Year: 2013

The present study involves the tracking of marching bands of more than 300,000 gregarious nymphs of the desert locust, Schistocerca gregaria, to examine shelter plant preference and how species and size of shelter plants and nymphal group sizes jointly influence the escaping behavior of 4th- and 5th-instar gregarious nymphs. Field observations are conducted during daytime and night-time in the Sahara Desert in Mauritania. Three dominant plant species have been identified at the survey site: Hyoscyamus muticus, Panicum turgidum, and Nucularia perrini. The smallest mean plant size among the three plant species is H. muticus. Gregarious nymphs perch on all the three plant species irrespective of time, and form various sizes of groups ranging from <10 to >10,000 nymphs. Groups of gregarious locusts perching on the plants show either escaping or sheltering behavior in response to an approaching observer. Percentages of nymphal groups showing escaping behavior for H. muticus, P. turgidum and N. perrini are 96.4, 47.6 and 19.5 %, respectively. Defensive behavior is not affected by nymphal group size but by species and size of shelter plants. Nymphal groups tend to show escaping behavior when their perching plants are relatively small. No groups escape from their perching plants during night. These results might indicate that gregarious nymphs do not have a strong shelter plant preference and change their defensive behavior depending on species and size of sheltering plants and light conditions. © 2013 Springer Science+Business Media New York.


Ould Maeno K.,The Mauritanian Desert Locust Center Center National Of Lutte Antiacridienne Cnla | Piou C.,CIRAD - Agricultural Research for Development | Ould Ely S.,The Mauritanian Desert Locust Center Center National Of Lutte Antiacridienne Cnla | Ould Mohamed S.,The Mauritanian Desert Locust Center Center National Of Lutte Antiacridienne Cnla | And 3 more authors.
Japan Agricultural Research Quarterly | Year: 2012

Solitarious phase locusts are cryptic animals and usually seek shelter in plants. This trait was thought to be a specific antipredator strategy associated with the solitarious phase. However, information on preferences for particular shelter plants and sheltering behavior remains limited. In the present study, small-scale field observations were conducted to investigate the sheltering behavior of the solitarious phase of the desert locust, Schistocerca gregaria, in relation to plant species and size. A spiny plant, Fagonia arabica, and two spineless plants, Nucularia perrini and Stipagrostis plumosa, were identified at the survey site. Although the size of F. arabica did not differ significantly from that of the two other plant species, almost all the solitarious locusts used F. arabica for shelter. Locusts were found on a majority (78%) of the individual F. arabica examined, but the number of sheltering locusts varied. The F. arabica plants with locusts were significantly larger than those without. A positive correlation was found between the total number of sheltered locusts (nymphs and adults) per individual plant and the plant size (m3). The same tendency was observed for nymphs and adults alike. The local densities (no. of sheltered locusts / plant size (m3)) remained constant over a range of plant sizes. These results might indicate that solitarious locusts selected their shelter plant based on its species and size. Because F. arabica is a spiny plant, we concluded that solitarious locusts use not only visual but also physical defense mechanisms as antipredator strategies. Discipline: Insect pest.

Loading The Mauritanian Desert Locust Center Center National Of Lutte Antiacridienne Cnla collaborators
Loading The Mauritanian Desert Locust Center Center National Of Lutte Antiacridienne Cnla collaborators