Phase-Dependent Color Polyphenism in Field Populations of Red Locust Nymphs (<i>Nomadacris septemfasciata</i>Serv.) in Madagascar

Lecoq, Michel; Chamouine, Abdou; Luong-Skovmand, My-Hanh

doi:10.1155/2011/105352

Cited by 9 publications

(10 citation statements)

References 43 publications

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“…It is mainly distributed throughout central and southern Africa; some isolated populations can also be found in the lake Chad basin, the central delta of the Niger River in Mali, and the Cape Verde Islands. Outbreak areas are mainly located in the Great Lakes region of East Africa, in Tanzania, Zambia, Malawi and Mozambique (COPR, 1982;Lecoq et al, 2011). They usually breed in seasonally-flooded plains where there is a mosaic of tall grasses and sedges (e.g., Echinochloa, Hyperrhenia, and Cyperus spp.)…”

Section: Red Locustmentioning

confidence: 99%

A Global Review on Locusts (Orthoptera: Acrididae) and Their Interactions With Livestock Grazing Practices

2019

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Connections between locusts and people date back millennia and locusts remain a major food security challenge today throughout the world. Locust biology is often linked to abiotic conditions like temperature and/or precipitation, fueling the perception that aside from active control, humans are not key players in the interaction locusts have with their environment. However, several studies have shown that land management practices like grazing heavily influences locust-human linkages. In this review we synthesize published research and reports on connections between locust outbreaks and ranching. For this, we conducted an extensive literature search using Google Scholar on the 19 species of grasshoppers that are currently considered to be locusts or non-model locusts. Species were sorted according to their feeding guilds: (1) forb-and/or tree-feeding locusts; (2) mix-feeding locusts (grasses, forbs, and/or trees); (3) grass-feeding locusts. We review their pest status, ecology, and relationship with grazing. We then discuss the overall data and draw general patterns on how locusts and locust control affect livestock grazing through various mechanisms (competition, nutritional preferences, pesticide use, nutrient cycling). We draw attention to "telecoupling" a process in which land management practices like grazing have ecological feedbacks on locust populations, which in turn affects food security in distant regions due to the migratory capacity of locusts. Finally, we present new perspectives for sustainable management practices that integrate understanding of land management.

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Section: Red Locustmentioning

confidence: 99%

A Global Review on Locusts (Orthoptera: Acrididae) and Their Interactions With Livestock Grazing Practices

2019

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“…National planning of locust monitoring should also take into account the international situation in case migratory groups are formed elsewhere. As the transiens phase marks the first stages of gregarization and possible progressive development to invasion, a precise characterization of the transiens populations – using better behaviour, pigmentation, and morphology (desert locust: Duranton & Lecoq, ; red locust: Lecoq et al., ) – is crucial for effective prevention. In addition, the comprehensive mapping of wadis, and their integration into a geographic information system, could significantly improve the efficiency of the monitoring system (Lazar et al ).…”

Section: Discussionmentioning

confidence: 99%

Importance of solitarious desert locust population dynamics: lessons from historical survey data in Algeria

Lazar

Piou

Doumandji-Mitiche

et al. 2016

Entomologia Exp Applicata

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The desert locust, Schistocerca gregaria (Forskål) (Orthoptera: Acrididae), is a major pest and well known in its gregarious phase. However, it is not well understood during recession periods, when the solitarious phase populations are discrete. Nonetheless, these populations are at the origin of the invasions when ecological conditions become favourable. This lack of knowledge of the solitarious phase individuals impedes effective preventive management of this pest. Archive data collected in Algeria from 1980 to 2011 were used to analyse solitarious population dynamics across the Algerian Sahara where some outbreak areas are located that play a major role in the invasion process. The results confirm previous empirical observations on solitarious population dynamics. First, a clear difference could be documented between the northern and southern Saharan regions of Algeria concerning the locust dynamics and the impact of environmental conditions. The importance of runoff was clear to create suitable habitats over a long period and to very distant places from rainy areas. Second, a link, on an annual basis, between green vegetation and presence of solitarious locusts was found. Third, statistical relationships between various locations demonstrated a clear regional dynamics. Our study confirmed the importance of migrations of solitarious populations among Algerian regions and more generally within the recession area of this species. The operational implications of these findings are multiple. First, they confirm the need of a flexible and scalable preventive system during the year, from 1 year to another and with a clear distinction between the northern and southern Saharan areas of Algeria. Second, they also confirm the necessity for the inclusion of wadis and soil moisture estimations from remote sensing in geographic information systems for preventive management. And third, they clearly illustrate the importance to target solitarious locusts for more efficient preventive survey operations.

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“…During our 8-y study, monitored locust populations were mostly of low density, often less than 1,000 adults/ha or 50,000 hoppers/ha, thus much lower than the phase-transformation threshold, which is estimated to be around 5,000 adults/ha (Spurgin & Chomba 1999, Franc et al 2005 or 100,000 hoppers/ha (Lecoq et al 2011). For the two years (2004-2005 and 2005-2006) studied more intensely (2,877 surveys throughout south Madagascar), we observed only eight cases with adult densities higher than 5,000/ha (max.…”

Section: Methodsmentioning

confidence: 96%

“…However, in the northern part of the island, a new outbreak area appeared from 2000 to 2003, probably influenced by increased human activities, primarily deforestation (Franc et al 2008). These outbreaks stimulated new research on the Red Locust in Madagascar, resulting in a better understanding of its biology and ecology, the characteristics of the solitary and gregarious phases, and the gregarization thresholds both for hoppers and adults (Franc et al 2005(Franc et al , 2007(Franc et al , 2008(Franc et al , 2009Lecoq et al 2006Lecoq et al , 2011. These recent works also suggest that in the southern tip of Madagascar the Red…”

Section: Introductionmentioning

confidence: 99%

Ecology and Population Dynamics of Solitary Red Locusts in Southern Madagascar

Lecoq¹,

Andriamaroahina²,

Solofonaina³

et al. 2011

Journal of Orthoptera Research

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Phase-Dependent Color Polyphenism in Field Populations of Red Locust Nymphs (Nomadacris septemfasciataServ.) in Madagascar

Cited by 9 publications

References 43 publications

A Global Review on Locusts (Orthoptera: Acrididae) and Their Interactions With Livestock Grazing Practices

A Global Review on Locusts (Orthoptera: Acrididae) and Their Interactions With Livestock Grazing Practices

Importance of solitarious desert locust population dynamics: lessons from historical survey data in Algeria

Ecology and Population Dynamics of Solitary Red Locusts in Southern Madagascar

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