Insulin/IGF Signaling and Life History Traits in Response to Food Availability and Perceived Density in the Cnidarian Hydra vulgaris

2017 ◽  
Vol 34 (4) ◽  
pp. 318
Author(s):  
Flóra Sebestyén ◽  
Szilárd Póliska ◽  
Rita Rácz ◽  
Judit Bereczki ◽  
Kinga Lénárt ◽  
...  
Keyword(s):  
Life History ◽  
Food Availability ◽  
Life History Traits ◽  
Hydra Vulgaris ◽  
Igf Signaling

Should I stay or should I go? Complex environments influence the developmental plasticity of flight capacity and flight-related trade-offs

2019 ◽  
Vol 128 (1) ◽  
pp. 59-69 ◽  
Author(s):  
Jordan R Glass ◽  
Zachary R Stahlschmidt
Keyword(s):  
Life History ◽  
Food Availability ◽  
Life History Traits ◽  
Developmental Plasticity ◽  
Temperature Variability ◽  
Field Cricket ◽  
Valuable Insight ◽  
Complex Environments ◽  
Trade Offs ◽  
Flight Capacity

Abstract Complex environments, characterized by co-varying factors (e.g. temperature and food availability) may cause animals to invest resources differentially into fitness-related traits. Thus, experiments manipulating multiple environmental factors concurrently provide valuable insight into the role of the environment in shaping not only important traits (e.g. dispersal capacity or reproduction), but also trait–trait interactions (e.g. trade-offs between traits). We used a multi-factorial design to manipulate variation in temperature (constant 28 °C vs. 28 ± 5 °C daily cycle) and food availability (unlimited vs. intermittent access) throughout development in the sand field cricket (Gryllus firmus). Using a univariate approach, we found that temperature variability and unlimited food availability promoted survival, development, growth, body size and/or reproductive investment. Using principal components as indices of resource allocation strategy, we found that temperature variability and unlimited food reduced investment into flight capacity in females. Thus, we detected a sex-specific trade-off between flight and other life-history traits that was developmentally plastic in response to variation in temperature and food availability. We develop an experimental and statistical framework to reveal shifts in correlative patterns of investment into different life-history traits. This approach can be applied to a range of biological systems to investigate how environmental complexity influences traits and trait trade-offs.

Food availability and nest predation influence life history traits in Audouin's gull, Larus audouinii

Oecologia ◽  
1999 ◽  
Vol 118 (4) ◽  
pp. 438-445 ◽  
Author(s):  
Daniel Oro ◽  
Roger Pradel ◽  
Jean-Dominique Lebreton
Keyword(s):  
Life History ◽  
Food Availability ◽  
Nest Predation ◽  
Life History Traits ◽  
Larus Audouinii
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