Cartographie des zones de reproduction et de grégarisation du criquet pèlerin au Tchad

Kayalto, Mathias; Hassani, Lalla Mina Idrissi; Lecoq, Michel; Gay, Pierre‐Emmanuel; Piou, Cyril

doi:10.1051/cagri/2020011

Cited by 9 publications

(6 citation statements)

References 16 publications

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“…Non-outbreak observations were classified if there were solitarious or no nymphs identified. This approach is similar to other studies analyzing desert locust reproduction successes (Piou et al 2017, Kayalto et al 2020.…”

Section: Desert Locustsupporting

confidence: 55%

Seeing the locust in the swarm: accounting for spatiotemporal hierarchy improves ecological models of insect populations

et al. 2022

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Ecological phenomena operate at different spatial scales and are not uniform across landscapes or through time. One ecological theory that attempts to account for scaling and spatiotemporal variances is hierarchical patch dynamics. It introduces a hierarchical patch network with smaller spatiotemporal scales being nested within larger scales. However, few studies have modeled its presence within animal population dynamics. Locusts are an excellent model for investigating the spatiotemporal hierarchy of animal population dynamics, due to their high migratory capacity, large geographic ranges that extend across widely differing environments, and available long‐term data on distributions. Here, we investigated the influence of preceding vegetation growth on desert locust Schistocerca gregaria and Australian plague locust Chortoicetes terminifera outbreaks on three spatial levels (species range > geographic region > land unit) and between seasons. Both species are dryland herbivores with population dynamics linked to habitat productivity pulses after rain. We used NDVI data (MODIS imagery) as a measure of vegetation growth in hierarchical generalized additive models at different scales. Locust outbreaks were either preceded by vegetation growth between 78 and 32 days (Australian plague locusts) or 32 and 20 days before (desert locust) the observation. Although prior vegetation growth characterized outbreaks of both species, the temporal pattern of NDVI differed between spatiotemporal levels. All model selection criteria selected for a similar spatial hierarchy for both species: geographic region > land unit which supports the hierarchical patch dynamics paradigm. Further, it illuminates important timing differences between geographic regions and land units for preceding vegetation growth and locust outbreaks which can help locust managers identify when and where outbreaks occur. By acknowledging the spatiotemporal patterning of locust abundance, we account for heterogeneity of population dynamics throughout species ranges. Our findings demonstrate the importance of incorporating spatiotemporal variation in population models of insects and other animals.

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Section: Desert Locustsupporting

confidence: 55%

Seeing the locust in the swarm: accounting for spatiotemporal hierarchy improves ecological models of insect populations

et al. 2022

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“…However, probably, a more parsimonious explanation is that effective preventive strategies put in place for different locust species in the world in the sixties [1,83], play key roles in long recession periods. The gregarization process in SAL has been compared with that of S. gregaria in the laboratory [9], but there needs to be field studies such as those already conducted for S. gregaria [67,[98][99][100][101][102]. A detailed analysis of ways to improve methods of treatment are required, not only an investigation of the latest chemical treatments appropriate for governments and landholders but also an integration of biological control, as has been already accomplished in Australia [103], Mexico [104], China [55], Tanzania [105], and Somalia [106] as part of complete implementation of Integrated Pest Management programs.…”

Section: Re-establishing a Sustained Sal Preventive Management Programmentioning

confidence: 99%

A Review of the Biology, Ecology, and Management of the South American Locust, Schistocerca cancellata (Serville, 1838), and Future Prospects

et al. 2022

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In the first half of the twentieth century, the South American Locust (SAL), Schistocerca cancellata (Serville, 1838), was a major pest of agriculture in Argentina, Bolivia, Paraguay, Uruguay, and Brazil. From 1954–2014, a preventive management program appeared to limit SAL populations, with only small- to moderate-scale treatments required, limited to outbreak areas in northwest Argentina. However, the lack of major locust outbreaks led to a gradual reduction in resources, and in 2015, the sudden appearance of swarms marked the beginning of a substantial upsurge, with many swarms reported initially in Argentina in 2015, followed by expansion into neighboring countries over the next few years. The upsurge required a rapid allocation of resources for management of SAL and a detailed examination of the improvements needed for the successful management of this species. This paper provides a review of SAL biology, management history, and perspectives on navigating a plague period after a 60-year recession.

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“…(5) Climate change is likely to alter the probability, severity and location of outbreaks [63][64][65]. However, the level of understanding of the magnitude and directionality of impacts and responses of various locust species to climate change remains low [66].…”

Section: A Few Key Lessonsmentioning

confidence: 99%

What Have We Learned after Millennia of Locust Invasions?

Lecoq

Cease

2022

Agronomy

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Locust outbreaks have long been a very serious problem for agriculture and livelihoods in many countries globally. This article is an introduction to a Special Issue of the journal Agronomy devoted to the management of these pests. Although not exhaustive, the nineteen articles herein cover a variety of species, many regions of the world and many aspects of pest locust management and research in the early 21st century. This book is a source of information and reflection, as well as a resource, to support new areas of investigation and practice contributing to the process of developing sustainable solutions for locust invasions.

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Cartographie des zones de reproduction et de grégarisation du criquet pèlerin au Tchad

Cited by 9 publications

References 16 publications

Seeing the locust in the swarm: accounting for spatiotemporal hierarchy improves ecological models of insect populations

Seeing the locust in the swarm: accounting for spatiotemporal hierarchy improves ecological models of insect populations

A Review of the Biology, Ecology, and Management of the South American Locust, Schistocerca cancellata (Serville, 1838), and Future Prospects

What Have We Learned after Millennia of Locust Invasions?

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