Plant genetic identity of foundation tree species and their hybrids affects a litter-dwelling generalist predator

Todd Wojtowicz, Zacchaeus G. Compson, Louis J. Lamit, Thomas G Whitham, Catherine A Gehring

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The effects of plant genetics on predators, especially those not living on the plant itself, are rarely studied and poorly understood. Therefore, we investigated the effect of plant hybridization and genotype on litter-dwelling spiders. Using an 18-year-old cottonwood common garden, we recorded agelenid sheet-web density associated with the litter layers of replicated genotypes of three tree cross types: Populus fremontii,Populus angustifolia, and their F1 hybrids. We surveyed 118 trees for agelenid litter webs at two distances from the trees (0–100 and 100–200 cm from trunk) and measured litter depth as a potential mechanism of web density patterns. Five major results emerged: web density within a 1-m radius of P. angustifolia was approximately three times higher than within a 1-m radius of P. fremontii, with F1 hybrids having intermediate densities; web density responded to P. angustifolia and F1 hybrid genotypes as indicated by a significant genotype × distance interaction, with some genotypes exhibiting a strong decline in web density with distance, while others did not; P. angustifolia litter layers were deeper than those of P. fremontii at both distance classes, and litter depth among P. angustifolia genotypes differed up to 300 %; cross type and genotype influenced web density via their effects on litter depth, and these effects were influenced by distance; web density was more sensitive to the effects of tree cross type than genotype. By influencing generalist predators, plant hybridization and genotype may indirectly impact trophic interactions such as intraguild predation, possibly affecting trophic cascades and ecosystem processes.

Original languageEnglish (US)
Pages (from-to)799-810
Number of pages12
JournalOecologia
Volume176
Issue number3
DOIs
StatePublished - Oct 24 2014

Fingerprint

plant genetics
Pedigree
Populus angustifolia
litters (young animals)
generalist
Populus
litter
genotype
Genotype
predator
predators
Populus fremontii
hybridization
intraguild predation
trophic cascade
Spiders
dwelling
trophic interaction
spider
gardens

Keywords

  • Agelenidae
  • Cross type
  • Genotype
  • Intraspecific plant variation
  • Populus

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Medicine(all)

Cite this

Plant genetic identity of foundation tree species and their hybrids affects a litter-dwelling generalist predator. / Wojtowicz, Todd; Compson, Zacchaeus G.; Lamit, Louis J.; Whitham, Thomas G; Gehring, Catherine A.

In: Oecologia, Vol. 176, No. 3, 24.10.2014, p. 799-810.

Research output: Contribution to journalArticle

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