Mass‐ and Density‐Dependent Reproductive Success and Reproductive Costs in a Capital Breeder

1998 ◽  
Vol 152 (3) ◽  
pp. 367-379 ◽  
Author(s):  
Marco Festa‐Bianchet ◽  
Jean‐Michel Gaillard ◽  
Jon T. Jorgenson
Keyword(s):  
Reproductive Success ◽  
Reproductive Costs ◽  
Density Dependent ◽  
Capital Breeder

Riverine characteristics and adult demography influence female lake sturgeon (Acipenser fulvescens) spawning behavior, reproductive success, and ovarian quality

2019 ◽  
Vol 76 (7) ◽  
pp. 1147-1160 ◽  
Author(s):  
Kari J. Dammerman ◽  
Molly A.H. Webb ◽  
Kim T. Scribner
Keyword(s):  
Reproductive Success ◽  
Behavioral Plasticity ◽  
Lake Sturgeon ◽  
Operational Sex Ratio ◽  
Plasma Testosterone ◽  
Acipenser Fulvescens ◽  
Reproductive Costs ◽  
Arrival Date ◽  
Factors Influencing ◽  
Yearly Means

Abiotic conditions and demographic factors can influence the timing of spawning. Behavioral plasticity allows females to select spawning conditions that are conducive to offspring development; however, reproductive costs associated with delaying spawning are not well understood. In this study, factors influencing timing of female spawning, residence time (RT), and reproductive success (RS) during two seasons were determined, and plasma testosterone concentrations were used to quantify atretic rates in a wild, lake sturgeon (Acipenser fulvescens) population. For the 123 females monitored, RT ranged from 1 to 23 days and was influenced by arrival date, temperature, discharge, and male number, with the latter having the largest influence. RS varied due to arrival date, temperature, discharge, male number, male length, and operational sex ratio. Two females had testosterone levels indicative of atresia and RS estimates lower than yearly means; however, most females had normal ovaries, suggesting little reproductive costs of plasticity in spawning ground residency time. Results demonstrate the multitude of factors influencing female reproductive behavior and RS, highlighting the importance of abiotic and demographic conditions to recruitment in wild populations.

Density-dependent variation in reproductive success in a terrestrial orchid

2001 ◽  
Vol 227 (1-2) ◽  
pp. 27-36 ◽  
Author(s):  
E. J. Meléndez-Ackerman ◽  
J. D. Ackerman
Keyword(s):  
Reproductive Success ◽  
Terrestrial Orchid ◽  
Density Dependent

scholarly journals Density‐dependent population dynamics of a high Arctic capital breeder, the barnacle goose

2019 ◽  
Vol 88 (8) ◽  
pp. 1191-1201 ◽  
Author(s):  
Kate Layton‐Matthews ◽  
Maarten J. J. E. Loonen ◽  
Brage Bremset Hansen ◽  
Christophe F. D. Coste ◽  
Bernt‐Erik Sæther ◽  
...  
Keyword(s):  
Population Dynamics ◽  
High Arctic ◽  
Barnacle Goose ◽  
Density Dependent ◽  
Capital Breeder

Reproductive Effort and Costs

2021 ◽  
pp. 59-74
Author(s):  
Jeffrey A. Hutchings
Keyword(s):  
Life History ◽  
Reproductive Success ◽  
Total Energy ◽  
Reproductive Effort ◽  
Life History Evolution ◽  
Reproductive Costs ◽  
Positive Outcomes ◽  
Differential Allocation ◽  
Trade Offs ◽  
Potential Benefits

Predictions about life-history evolution are intellectually bereft without a consideration of trade-offs. Benefits derived from making one life-history ‘decision’ are made at a cost of not realizing potential benefits associated with alternative decisions. These trade-offs are the inevitable product of constraints, often driven by an individual’s differential allocation of fixed resources to reproduction versus survival or growth. These allocations prevent multiple positive outcomes from being simultaneously realized. Reproductive effort is the proportion of total energy or resources allocated to all elements of reproduction. Reproductive effort generates reproductive costs. Increases in current reproductive effort reduce future reproductive success by affecting survival, growth, and/or fecundity. The causal mechanisms of these costs can be energetic, ecological, behavioural, or genetic. Evidence for reproductive costs is widespread. Instances where the evidence of costs is equivocal are usually caused by using among-individual correlations to study what is a within-individual phenomenon.

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