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Scavenging behavior and interspecific competition decrease offspring fitness of the entomopathogenic nematode Steinernema feltiae

2019-06Journal article Restricted access
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dc.contributor.authorPEREZ, RUBEN
dc.contributor.authorBueno-Pallero, Francisco Angel
dc.contributor.authorVicente-Diez, Ignacio
dc.contributor.authorSantiago Marco-Mancebon, Vicente
dc.contributor.authorPerez-Moreno, Ignacio
dc.contributor.authorCampos-Herrera, Raquel
dc.date.accessioned2020-07-24T10:52:12Z
dc.date.available2020-07-24T10:52:12Z
dc.date.issued2019-06
dc.description.abstractEntomopathogenic nematodes (EPNs) are well-studied biocontrol agents of soilw-dwelling arthropod pests. The insecticidal efficiency of EPNs is modulated by food web dynamics. EPNs can reproduce in freeze-killed insect larvae, even in competition with free-living bacterivorous nematodes (FLBNs) in the genus Oscheius. The objective of this study was to assess the efficiency of EPNs as scavengers when competing with free-living saprophagous nematodes and fungi, and to determine the possible impact on subsequent EPN offspring fitness. Live and freeze-killed larvae of Galleria mellonella were used to evaluate the reproduction rate and progeny fitness of two EPN species, Heterorhabditis bacteriophora and Steinernema feltiae, applied individually or combined with the FLBN species Oscheius onirici or Pristionchus maupasi, or Aspergillus flavus, an opportunistic saprophytic fungus. We hypothesized that (1) EPN scavenging behaviors previously observed (for H. megidis and S. kraussei) apply to other EPN species, (2) infective juveniles (IJs) emerging from freeze-killed larvae will display reduced pathogenicity and reproduction, and (3) fitness reduction will be amplified by exposure to other organisms competing for the resources. The reproduction rate of S. feltiae was lower in freeze-killed larvae than in larvae infected and killed by the nematode, whereas H. bacteriophora failed to reproduce as a scavenger. The S. feltiae Fl IJs that emerged from freeze-killed larvae exhibited lower pathogenicity rates than Us resulting from entomopathogenic activity, and also lower reproductive rates if they experienced high FLBN competitive pressure during development. This study illustrates that scavenging is a suboptimal alternative pathway for EPNs, especially in the face of scavenger competition, even though it provides a means for some EPN species to complete their life-cycle.
dc.description.sponsorshipGovernment of Portugal (FCT) [IF/00552/2014/CP1234/CT0007]
dc.description.sponsorshipInvestigator Programme contract (FCT, Portugal) [IF/00552/2014]
dc.description.sponsorshipUniversidade do Algarve, Portugal [UAlg-2016/004, UAlg-2016/003]
dc.description.sponsorshipGovernment of Spain
dc.description.sponsorshipRamon y Cajal contractSpanish Government [RYC-2016-19939]
dc.description.sponsorshipGovernment of La Rioja (Spain) [CAR-2018]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.jip.2019.04.002
dc.identifier.issn0022-2011
dc.identifier.issn1096-0805
dc.identifier.urihttp://hdl.handle.net/10400.1/14331
dc.language.isoeng
dc.peerreviewedyes
dc.publisherAcademic Press Inc Elsevier Science
dc.subjectHost search strategies
dc.subjectNeoaplectana-carpocapsae
dc.subjectHeterorhabditis
dc.subjectInfection
dc.subjectLarvae
dc.subjectReproduction
dc.subjectPristionchus
dc.subjectAssemblages
dc.subjectBeetle
dc.subjectRange
dc.titleScavenging behavior and interspecific competition decrease offspring fitness of the entomopathogenic nematode Steinernema feltiae
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage15
oaire.citation.startPage5
oaire.citation.titleJournal of Invertebrate Pathology
oaire.citation.volume164
person.familyNamePEREZ
person.familyNameCampos-Herrera
person.givenNameRUBEN
person.givenNameRaquel
person.identifier75402
person.identifier.orcid0000-0003-2846-3165
person.identifier.orcid0000-0003-0852-5269
person.identifier.ridA-5299-2017
person.identifier.scopus-author-id16318511600
rcaap.rightsrestrictedAccess
rcaap.typearticle
relation.isAuthorOfPublicationb1885d97-a078-4504-bd58-fa87acfbdfb7
relation.isAuthorOfPublication28736fd2-ac4e-43ac-84e0-51a1a10ffc28
relation.isAuthorOfPublication.latestForDiscovery28736fd2-ac4e-43ac-84e0-51a1a10ffc28

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