Barriers to salmon migration impact body condition, offspring size, and life history variation in an avian consumer

Ecography ◽  
2016 ◽  
Vol 39 (11) ◽  
pp. 1056-1065 ◽  
Author(s):  
Christopher M. Tonra ◽  
Kimberly Sager-Fradkin ◽  
Peter P. Marra
Keyword(s):  
Life History ◽  
Body Condition ◽  
Offspring Size ◽  
Life History Variation

scholarly journals The influence of juvenile and adult environments on life-history trajectories

2005 ◽  
Vol 273 (1587) ◽  
pp. 741-750 ◽  
Author(s):  
Barbara Taborsky
Keyword(s):  
Life History ◽  
Life Histories ◽  
Adult Life ◽  
Growth Conditions ◽  
Offspring Size ◽  
Juvenile Growth ◽  
Life History Variation ◽  
Major Life ◽  
Adult Growth ◽  
Trade Offs

There is increasing evidence that the environment experienced early in life can strongly influence adult life histories. It is largely unknown, however, how past and present conditions influence suites of life-history traits regarding major life-history trade-offs. Especially in animals with indeterminate growth, we may expect that environmental conditions of juveniles and adults independently or interactively influence the life-history trade-off between growth and reproduction after maturation. Juvenile growth conditions may initiate a feedback loop determining adult allocation patterns, triggered by size-dependent mortality risk. I tested this possibility in a long-term growth experiment with mouthbrooding cichlids. Females were raised either on a high-food or low-food diet. After maturation half of them were switched to the opposite treatment, while the other half remained unchanged. Adult growth was determined by current resource availability, but key reproductive traits like reproductive rate and offspring size were only influenced by juvenile growth conditions, irrespective of the ration received as adults. Moreover, the allocation of resources to growth versus reproduction and to offspring number versus size were shaped by juvenile rather than adult ecology. These results indicate that early individual history must be considered when analysing causes of life-history variation in natural populations.

Larval body condition regulates predator-induced life-history variation in a dragonfly

Ecology ◽  
2017 ◽  
Vol 99 (1) ◽  
pp. 224-230 ◽  
Author(s):  
Michael P. Moore ◽  
Cassandra Lis ◽  
Ryan A. Martin
Keyword(s):  
Life History ◽  
Body Condition ◽  
Life History Variation ◽  
Larval Body

Maternal investment mediates offspring life history variation with context-dependent fitness consequences

Ecology ◽  
2015 ◽  
Vol 96 (9) ◽  
pp. 2499-2509 ◽  
Author(s):  
Michael P. Moore ◽  
Tobias Landberg ◽  
Howard H. Whiteman
Keyword(s):  
Life History ◽  
Maternal Investment ◽  
Life History Variation ◽  
Fitness Consequences ◽  
Context Dependent
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