Nom du corpus

Corpus Systématique Animale

Titre du document

Host plant-mediated variation in overwintering site quality: implications for the size and composition of populations of Acanthoscelides alboscutellatus (Coleoptera: Bruchidae)

Lien vers le document
Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Mots-clés d'auteur
  • Overwintering survivorship
  • Host plant quality
  • Plant-animal interactions
  • Insecta
Nom du fichier dans la ressource
Insectes_v2b_00188
Auteur(s)
  • James R. Ott
Affiliation(s)
  • Department of Zoology, University of Maryland, 20742, College Park, MD, USA
Résumé

This study provides an example of how variation in the quality of overwintering sites provided by the host plant of an insect seed predator can influence both the probability of overwintering survival and the size and composition of postwintering populations. Thus, the concept of host plant quality is extended to include variation in the suitability of the overwintering site of temperate region insects that overwinter within, or in habitats created by, their host plant. Adult Acanthoscelides alboscutellatus (Horn) (Coleoptera: Bruchidae) overwinter inside the fruit of Ludwigia alternifolia (L.) (Onagraceae). In early winter, however, fruits begin to dehisce, i.e., one or more of the fruit's four sides and/or top are shed. Variation in the onset and extent of dehiscence creates a range of overwintering habitats that vary in exposure to ambient conditions. In this study the frequency of possible overwintering sites in natural populations of L. alternifolia was determined by monitoring the phenology of fruit dehiscence from October through May in two populations for four years and for a third population for three years. Winter survivorship of adult A. alboscutellatus was assessed experimentally in eight environments representative of the conditions created by variation in dehiscence. These environments were produced by crossing four levels of exposure (degree of dehiscence) with two locations of the overwintering site, i.e., above or on the ground surface. The onset, phenology, and overall frequency of fruit dehiscence varied markedly among populations and years. Exposure, location, and their interaction had strong effects on survival and accounted for 80% of the observed variation in winter survival. Survivorship was higher on than above the ground, and in both locations decreased with increasing exposure. Thus, variation in fruit dehiscence among L. alternifolia populations will influence the size of postwintering A. alboscutellatus populations by dictating the quality of overwintering sites. Adult beetles that over-winter inside indehiscent fruit experience selection for small body size, associated with high mortality, when they attempt to exit the fruit at eclosion. As a consequence, the frequency of fruit dehiscence at eclosion coupled with the relative survival rates of adults within indehiscent fruit will determine the body size composition of postwintering populations and hence the response to selection for small body size in this species.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - biology
  • 3 - ecology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - agronomie. sciences du sol et productions vegetales
Catégories Scopus
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Ecology, Evolution, Behavior and Systematics
Catégories WoS
  • 1 - science ; 2 - ecology
Identifiant ISTEX
434527938748921EACAA6E146536B03F98619A05
Revue

Oecologia

Année de publication
1993
Présence de XML structuré
Non
Version PDF
1.3
Score qualité du texte
10
Sous-corpus
  • Insectes
Type de publication
Journal
ark:/67375/1BB-B9DQTJP6-4
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