Results 221 to 230 of about 127,331 (261)

Apparent competition and native consumers exacerbate the strong competitive effect of an exotic plant species

Ecology, 2015
Direct and indirect effects can play a key role in invasions, but experiments evaluating both are rare. We examined the roles of direct competition and apparent competition by exotic Amur honeysuckle (Lonicera maackii) by manipulating (1) L. maackii vegetation, (2) presence of L.
John L, Orrock, Humberto P, Dutra, Robert J, Marquis, Nicholas, Barber   +3 more
openaire   +2 more sources

Temperature and depth mediate resource competition and apparent competition between Mysis diluviana and kokanee

Ecological Applications, 2015
In many food webs, species in similar trophic positions can interact either by competing for resources or boosting shared predators (apparent competition), but little is known about how the relative strengths of these interactions vary across environmental gradients.
Erik R, Schoen, David A, Beauchamp, Anna R, Buettner, Nathanael C, Overman   +3 more
openaire   +2 more sources

Species Introduction and Replacement among Mosquitoes: Interspecific Resource Competition or Apparent Competition?

Ecology, 1998
Mechanisms by which an introduced container-dwelling mosquito, Aedes albopictus, may cause declines in a resident container-dwelling mosquito, Aedes aegypti, in South Florida were tested using a combination of field experiments and field observations.
openaire   +1 more source

Apparent competition between parasitoids mediated by a shared hyperparasitoid

Ecology Letters, 2000
Cocoons of the specialist parasitoidCotesia melitaearum, which attacks the Glanville fritillary butterfly in the Åland islands of SW Finland, are parasitized by the generalist hyperparasitoidGelis agilis. We added experimentally to the system a second host species forG. agilis,C. glomerata, with whichC. melitaearumdoes not compete for resources.
Saskya Van Nouhuys, Ilkka Hanski
openaire   +1 more source

Predation, apparent competition, and the structure of prey communities

Theoretical Population Biology, 1977
Abstract It is argued that alternate prey species in the diet of a food-limited generalist predator should reduce each other's equilibrial abundances, whether or not they directly compete. Such indirect, interspecific interactions are labeled apparent competition . Two examples are discussed in which an observed pattern of habitat segregation was at
openaire   +2 more sources

Apparent Competition and Enemy-Free Space in Insect Host-Parasitoid Communities

The American Naturalist, 1993
Apparent competition is indirect competition between two or more victim species that share a natural enemy, caused by that enemy's numerical response. We review empirical examples of apparent competition in phytophagous insect hosts attacked by polyphagous parasitoids and develop models of apparent competition in host-parasitoid systems.
R D, Holt, J H, Lawton
openaire   +2 more sources

Predator-mediated apparent competition between two herbivores that feed on grapevines

Oecologia, 1994
We have been releasing economically unimportant herbivorous mites of one species early in the season and protecting grapevines against another, more damaging herbivorous mite throughout the growing season. In this experiment, releases of economically unimportant Willamette mites alone, or of predatory mites alone, failed to reduce populations of the ...
R, Karban, D, Hougen-Eitzmann, G, English-Loeb   +2 more
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Emergence asynchrony between herbivores leads to apparent competition in the field

Ecology, 2011
It has been established that herbivore populations can be structured by apparent competition, even if they do not compete directly for resources. But we lack evidence on the mechanisms behind such indirect competition. This study shows that temporal asynchronies in emergence time lead to apparent competition via shared natural enemies in a leafminer ...
Eleanor J, Blitzer, Stephen C, Welter
openaire   +2 more sources

Apparent competition can compromise the safety of highly specific biocontrol agents

Ecology Letters, 2008
Abstract Despite current concern about the safety of biological control of weeds, assessing the indirect impacts of introduced agents is not common practice. Using 17 replicate food webs, we demonstrate that the use of a highly host‐plant specific weed biocontrol agent, recently introduced into Australia, is associated with declines ...
Carvalheiro, L.G., Buckley, Y. M., Ventim, R., Fowler, S.V., Memmott, J.   +4 more
openaire   +3 more sources

Evaluating apparent competition in limiting the recovery of an endangered ungulate

Oecologia, 2012
Predation can disproportionately affect endangered prey populations when generalist predators are numerically linked to more abundant primary prey. Apparent competition, the term for this phenomenon, has been increasingly implicated in the declines of endangered prey populations.
Heather E, Johnson, Mark, Hebblewhite, Thomas R, Stephenson, David W, German, Becky M, Pierce, Vernon C, Bleich   +5 more
openaire   +2 more sources