scholarly journals Bottom‐up trait‐mediated indirect effects decrease pathogen transmission in a tritrophic system

Ecology ◽  
2018 ◽  
Vol 100 (1) ◽  
Author(s):  
Bret D. Elderd
Keyword(s):  
Indirect Effects ◽  
Pathogen Transmission ◽  
Bottom Up ◽  
Tritrophic System

Top-down versus bottom-up limitation in benthic infaunal communities: Direct and indirect effects

Estuaries ◽  
2002 ◽  
Vol 25 (5) ◽  
pp. 999-1014 ◽  
Author(s):  
Martin H. Posey ◽  
Troy D. Alphin ◽  
Lawrence B. Cahoon ◽  
David G. Lindquist ◽  
Michael A. Mallin ◽  
...  
Keyword(s):  
Indirect Effects ◽  
Direct And Indirect Effects ◽  
Top Down ◽  
Bottom Up

Bottom-up regulation of a tritrophic system by Beet yellows virus infection: consequences for aphid-parasitoid foraging behaviour and development

Oecologia ◽  
2019 ◽  
Vol 191 (1) ◽  
pp. 113-125 ◽  
Author(s):  
Loulou Albittar ◽  
Mohannad Ismail ◽  
Gertrud Lohaus ◽  
Arnaud Ameline ◽  
Bertanne Visser ◽  
...  
Keyword(s):  
Virus Infection ◽  
Foraging Behaviour ◽  
Aphid Parasitoid ◽  
Bottom Up ◽  
Tritrophic System ◽  
Beet Yellows Virus ◽  
Parasitoid Foraging

scholarly journals Direct and indirect effects of sea ice cover on major zooplankton groups and planktivorous fishes in the Barents Sea

2019 ◽  
Vol 76 (Supplement_1) ◽  
pp. i24-i36 ◽  
Author(s):  
Leif Christian Stige ◽  
Elena Eriksen ◽  
Padmini Dalpadado ◽  
Kotaro Ono
Keyword(s):  
Sea Ice ◽  
Indirect Effects ◽  
Barents Sea ◽  
Ice Cover ◽  
Arctic Sea Ice ◽  
Polar Cod ◽  
Direct And Indirect Effects ◽  
Top Down ◽  
Bottom Up ◽  
Delayed Effects

Abstract Reductions in Arctic sea ice affect marine food webs through a multitude of direct and indirect effects. We here analysed direct, indirect, and delayed associations between winter sea ice cover and year-to-year changes in biomasses of the main zooplankton groups (copepods, krill, amphipods) and planktivorous fishes (capelin, polar cod) in the central and northern Barents Sea from 1980 to 2015. Climate effects and species interactions were estimated jointly in a Bayesian state-space model framework. We found that population biomass of capelin increased in years with low sea ice cover, while biomasses of copepods and amphipods decreased. Furthermore, results suggested strong bottom-up effects by krill on capelin and by copepods on amphipods and top-down effects by polar cod on amphipods and by capelin on krill and copepods. Sea ice effects thereby cascaded through the food web through indirect and delayed effects. The indirect and delayed effects amplified the effects of sea ice cover on capelin, copepods and amphipods. For krill, low sea ice cover most likely increased biomass in the short-term but reduced biomass in longer terms because of increased predation pressure. These findings suggest that both bottom-up and top-down processes need to be considered when projecting effects of future climate change on ecosystems.

Does Ego-Resilience Impact Friendship Outcomes?

2016 ◽  
Vol 37 (2) ◽  
pp. 128-134 ◽  
Author(s):  
Elizabeth B. Lozano ◽  
Mahzad Hojjat ◽  
Judith Sims-Knight
Keyword(s):  
Social Support ◽  
Young Adults ◽  
Indirect Effects ◽  
Positive Emotions ◽  
Positive Outcomes ◽  
Ego Resilience ◽  
Maintenance Behaviors ◽  
Received Social Support ◽  
Trait Resilience ◽  
The Relationship

Abstract. The present study examined the relationship between resilience and positive outcomes in friendships of young adults. SEM and bootstrapping analyses were performed to test whether positive emotions mediate the relationship between ego-resilience and enhanced friendship outcomes. Findings revealed indirect effects for friendship closeness, maintenance behaviors, and received social support. Our findings demonstrate the importance of positive emotions and its connection with trait resilience in the realm of friendships.

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