Disturbance‐Mediated Apparent Competition Decouples in a Northern Boreal Caribou Range

2020 ◽  
Author(s):  
Branden T. Neufeld ◽  
Clara Superbie ◽  
Ruth J. Greuel ◽  
Thomas Perry ◽  
Patricia A. Tomchuk ◽  
...  
Keyword(s):  
Apparent Competition ◽  
Boreal Caribou

scholarly journals Northern boreal caribou conservation should focus on anthropogenic disturbance, not disturbance-mediated apparent competition

2022 ◽  
Vol 265 ◽  
pp. 109426
Author(s):  
Clara Superbie ◽  
Kathrine M. Stewart ◽  
Charlotte E. Regan ◽  
Jill F. Johnstone ◽  
Philip D. McLoughlin
Keyword(s):  
Anthropogenic Disturbance ◽  
Apparent Competition ◽  
Boreal Caribou

scholarly journals Exotic plants accumulate and share herbivores yet dominate communities via rapid growth

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Warwick J. Allen ◽  
Lauren P. Waller ◽  
Barbara I. P. Barratt ◽  
Ian A. Dickie ◽  
Jason M. Tylianakis
Keyword(s):  
Plant Invasions ◽  
Exotic Plants ◽  
Apparent Competition ◽  
Indirect Interactions ◽  
Soil Biota ◽  
Exotic Plant Invasion ◽  
Plant Soil ◽  
Invasion Hypotheses ◽  
Plant Herbivore ◽  
Invertebrate Herbivores

AbstractHerbivores may facilitate or impede exotic plant invasion, depending on their direct and indirect interactions with exotic plants relative to co-occurring natives. However, previous studies investigating direct effects have mostly used pairwise native-exotic comparisons with few enemies, reached conflicting conclusions, and largely overlooked indirect interactions such as apparent competition. Here, we ask whether native and exotic plants differ in their interactions with invertebrate herbivores. We manipulate and measure plant-herbivore and plant-soil biota interactions in 160 experimental mesocosm communities to test several invasion hypotheses. We find that compared with natives, exotic plants support higher herbivore diversity and biomass, and experience larger proportional biomass reductions from herbivory, regardless of whether specialist soil biota are present. Yet, exotics consistently dominate community biomass, likely due to their fast growth rates rather than strong potential to exert apparent competition on neighbors. We conclude that polyphagous invertebrate herbivores are unlikely to play significant direct or indirect roles in mediating plant invasions, especially for fast-growing exotic plants.

scholarly journals Slowing down wolves to protect boreal caribou populations: a spatial simulation model of linear feature restoration

Ecosphere ◽  
2019 ◽  
Vol 10 (10) ◽  
Author(s):  
Matthias C. Spangenberg ◽  
Robert Serrouya ◽  
Melanie Dickie ◽  
Craig A. DeMars ◽  
Théo Michelot ◽  
...  
Keyword(s):  
Simulation Model ◽  
Spatial Simulation ◽  
Linear Feature ◽  
Slowing Down ◽  
Spatial Simulation Model ◽  
Boreal Caribou

Extrinsic Inter- and Intra-specific Competition in Parasitoid Wasps

2021 ◽  
Vol 67 (1) ◽  
Author(s):  
Paul J. Ode ◽  
Dhaval K. Vyas ◽  
Jeffrey A. Harvey
Keyword(s):  
Developmental Stages ◽  
Interference Competition ◽  
Apparent Competition ◽  
Annual Review ◽  
Publication Date ◽  
Natural Ecosystem ◽  
Adult Males ◽  
Alternate Host ◽  
Adult Females ◽  
Behavioral Mechanisms

The diverse ecology of parasitoids is shaped by extrinsic competition, i.e., exploitative or interference competition among adult females and males for hosts and mates. Adult females use an array of morphological, chemical, and behavioral mechanisms to engage in competition that may be either intra- or interspecific. Weaker competitors are often excluded or, if they persist, use alternate host habitats, host developmental stages, or host species. Competition among adult males for mates is almost exclusively intraspecific and involves visual displays, chemical signals, and even physical combat. Extrinsic competition influences community structure through its role in competitive displacement and apparent competition. Finally, anthropogenic changes such as habitat loss and fragmentation, invasive species, pollutants, and climate change result in phenological mismatches and range expansions within host–parasitoid communities with consequent changes to the strength of competitive interactions. Such changes have important ramifications not only for the success of managed agroecosystems, but also for natural ecosystem functioning. Expected final online publication date for the Annual Review of Entomology, Volume 67 is January 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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