Quantifying the associations between fungal endophytes and biocontrol-induced herbivory of invasive purple loosestrife (Lythrum salicaria L.).
Fungal endophytes are one of several groups of heterotrophic organisms that associate with living plants. The net effects of these groups of organisms on each other and ultimately on their host plants depend in part on how they facilitate or antagonize one another. In this study we quantified the associations between endophyte communities and herbivory induced by a biological control in the invasive Lythrum salicaria at various spatial scales using a culture-based approach. We found positive associations between herbivory damage and endophyte isolation frequency and richness at the site level and weak, positive associations at the leaf level. Herbivory damage was more strongly influenced by processes at the site level than were endophyte isolation frequency and community structure, which were influenced by processes at the plant and leaf levels. Furthermore, endophytic taxa found in low herbivory sites were nested subsets of those taxa found at high herbivory sites. Our findings suggest that endophyte communities of L. salicaria are associated with, and potentially facilitated by, biocontrol-induced herbivory. Quantifying the associations between heterotrophic groups ultimately may lead to a clearer understanding of their complex interactions with plants.
University of Minnesota, Department of Ecology, Evolution and Behavior, 1479 Gortner Avenue, Saint Paul, Minnesota 55108 david250@umn.edu.
Aaron S
AS
David
University of Minnesota, College of Continuing Education, 1994 Buford Ave, Saint Paul, Minnesota 55108.
Gina L
GL
Quiram
University of Minnesota, Natural Resources, Science and Management Program, 1530 Cleveland Avenue, Saint Paul, Minnesota 55108.
Jennie I
JI
Sirota
University of Minnesota, Department of Ecology, Evolution and Behavior, 1479 Gortner Avenue, Saint Paul, Minnesota 55108.
Eric W
EW
Seabloom
D000821:Animal Feed / Q000382:microbiology*; D044822:Biodiversity; D060026:Endophytes / Q000145:classification* / Q000502:physiology*; D005843:Geography; D060434:Herbivory; D031561:Lythrum / Q000382:microbiology*; D018515:Plant Leaves / Q000382:microbiology
community assembly; host-microbe interactions; microbial symbiont; nestedness; spatial structure