Contribution à l'étude de la bio-écologie de deux locustes péruviens, Schistocerca cf. interrita Scudder 1899 et Schistocerca piceifrons peruviana Lynch Arribalzaga 1903 (Orthoptera, Cyrtacanthacridinae)

Abstract

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

“…Taxonomic notes. The regional common name for this species "langosta migratoria" confuses taxonomic identification as the name is applied to S. piceifrons peruviana as well (Duranton et al, 2006).…”

“…Habitat and ecology. Schistocerca interrita is a mix-feeder that prefers dry wooded areas with sandy soils where plants in the genus Caparus and Angularis occur, as well as anthropogenically cleared areas (Duranton et al, 2006). Plants in the family Solanaceae such as Exodeconus prostatus as well as grasses are known food sources when solitarious individuals are at low densities (Morales R.S.…”

Density-Dependent Phase Polyphenism in Nonmodel Locusts: A Minireview

“…Schistocerca piceifrons (Walker, 1870) is distributed throughout Central America and the northern part of South America [19,23,24]. Two subspecies are recognized, the nominal subspecies and S. piceifrons peruviana which occurs in high elevations of Peru and Ecuador [24,29,72]. Recently, a migrant population was found on Socorro Island (Mexico) in the Pacific Ocean [73,74].…”

“…An anecdotal report of a locust swarm in Lambayeque is known from 1578, which can be probably attributed to S. interrita [31], but the most recent upsurge occurred in 1997-2003 in Lambayeque and Cajamarca of northern Peru. Schistocerca interrita is adapted to dry wooded area at the elevation of 3500 m above sea level, and population dynamics and basic ecology have not been thoroughly studied (see [29,31]). At low density, nymphs are green, but they develop black pattern with yellow background at high density.…”

“…Locusts are exceptionally adapted to their local environments, and these locust species may simply have the best combination of the traits that make them the most successful, compared to other species in the same taxonomic groups, or there may be some species that are capable of becoming locusts, but the environmental conditions are simply not conducive to the expression of locust phase polyphenism, and we cannot know whether one would be a locust or not a priori. For example, the recent outbreak of S. interrita was not anticipated because the species was not known to be a locust, but the El Niño phenomenon created an exceptionally favorable environment for the species to express its hidden potential to express locust phase polyphenism [29].…”