Reproductive efficiency of entomopathogenic nematodes as scavengers. Are they able to fight for insect's cadavers?

Journal of Invertebrate Pathology
Rubén Blanco-PérezRaquel Campos-Herrera

Abstract

Entomopathogenic nematodes (EPNs) and their bacterial partners are well-studied insect pathogens, and their persistence in soils is one of the key parameters for successful use as biological control agents in agroecosystems. Free-living bacteriophagous nematodes (FLBNs) in the genus Oscheius, often found in soils, can interfere in EPN reproduction when exposed to live insect larvae. Both groups of nematodes can act as facultative scavengers as a survival strategy. Our hypothesis was that EPNs will reproduce in insect cadavers under FLBN presence, but their reproductive capacity will be severely limited when competing with other scavengers for the same niche. We explored the outcome of EPN - Oscheius interaction by using freeze-killed larvae of Galleria mellonella. The differential reproduction ability of two EPN species (Steinernema kraussei and Heterorhabditis megidis), single applied or combined with two FLBNs (Oscheius onirici or Oscheius tipulae), was evaluated under two different infective juvenile (IJ) pressure: low (3IJs/host) and high (20IJs/host). EPNs were able to reproduce in insect cadavers even in the presence of potential scavenger competitors, although EPN progeny was lower than that recorded in live larvae. Henc...Continue Reading

Citations

Jul 7, 2020·Journal of Nematology·Ramandeep K SandhiGadi V P Reddy
Aug 23, 2020·Microbial Ecology·Abigail M D MaherChristine T Griffin
Jun 22, 2018·Insects·Sophie Labaude, Christine T Griffin
Sep 14, 2019·Journal of Invertebrate Pathology·Keyun ZhangAdler R Dillman
Sep 25, 2021·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Xin WangJia Bao

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