An Empirical Model of the Optimal Timing of Reproduction for Female Amphipods Infected by Trematodes

2001 ◽  
Vol 87 (1) ◽  
pp. 24
Author(s):  
Dean G. McCurdy ◽  
J. Sherman Boates ◽  
Mark R. Forbes
Keyword(s):  
Empirical Model ◽  
Optimal Timing ◽  
Timing Of Reproduction

The Optimal Timing of Reproduction

1976 ◽  
Vol 110 (975) ◽  
pp. 801-807 ◽  
Author(s):  
Dan Cohen
Keyword(s):  
Optimal Timing ◽  
Timing Of Reproduction

scholarly journals Parent-offspring conflict over reproductive timing: ecological dynamics far away and at other times may explain spawning variability in Pacific herring

2018 ◽  
Vol 76 (2) ◽  
pp. 559-572 ◽  
Author(s):  
Gabriella Ljungström ◽  
Tessa B Francis ◽  
Marc Mangel ◽  
Christian Jørgensen
Keyword(s):  
Food Availability ◽  
Life History Theory ◽  
Puget Sound ◽  
Optimal Timing ◽  
Pacific Herring ◽  
Reproductive Timing ◽  
Timing Of Reproduction ◽  
State Dependent ◽  
Breeding Habitats ◽  
Adult Food

Abstract Timing of reproduction may be of crucial importance for fitness, particularly in environments that vary seasonally in food availability or predation risk. However, for animals with spatially separated feeding and breeding habitats, optimal reproductive timing may differ between parents and their offspring, leading to parent-offspring conflict. We assume that offspring have highest survival and fitness if they are spawned around a fixed date, and use state-dependent life-history theory to explore whether variation in conditions affecting only parents (food availability and survival) may influence optimal timing of reproduction. We apply the model to Pacific herring (Clupea palasii) in Puget Sound, USA, where 20 subpopulations spawn at different times of the year. Our model suggests that relatively small differences in adult food availability can lead to altered prioritization in the trade-off between maternal fecundity and what from the offspring’s perspective is the best time to be spawned. Our model also shows that observed among-population variability in reproductive timing may result from adults using different feeding grounds with divergent food dynamics, or from individual variation in condition caused by stochasticity at a single feeding ground. Identifying drivers of reproductive timing may improve predictions of recruitment, population dynamics, and responses to environmental change.

On the Optimal Timing of Reproduction

1979 ◽  
Vol 114 (3) ◽  
pp. 461-466 ◽  
Author(s):  
Shmuel Amir
Keyword(s):  
Optimal Timing ◽  
Timing Of Reproduction

scholarly journals Climate warming may affect the optimal timing of reproduction for migratory geese differently in the low and high Arctic

Oecologia ◽  
2019 ◽  
Vol 191 (4) ◽  
pp. 1003-1014 ◽  
Author(s):  
Thomas K. Lameris ◽  
Margje E. de Jong ◽  
Michiel P. Boom ◽  
Henk P. van der Jeugd ◽  
Konstantin E. Litvin ◽  
...  
Keyword(s):  
Climate Warming ◽  
High Arctic ◽  
Egg Laying ◽  
The Arctic ◽  
Laying Date ◽  
Optimal Timing ◽  
Negative Effects ◽  
Barnacle Goose ◽  
Timing Of Reproduction ◽  
Low Arctic

Abstract Rapid climate warming is driving organisms to advance timing of reproduction with earlier springs, but the rate of advancement shows large variation, even among populations of the same species. In this study, we investigated how the rate of advancement in timing of reproduction with a warming climate varies for barnacle goose (Branta leucopsis) populations breeding at different latitudes in the Arctic. We hypothesized that populations breeding further North are generally more time constrained and, therefore, produce clutches earlier relative to the onset of spring than southern populations. Therefore, with increasing temperatures and a progressive relief of time constraint, we expected latitudinal differences to decrease. For the years 2000–2016, we determined the onset of spring from snow cover data derived from satellite images, and compiled data on egg laying date and reproductive performance in one low-Arctic and two high-Arctic sites. As expected, high-Arctic geese laid their eggs earlier relative to snowmelt than low-Arctic geese. Contrary to expectations, advancement in laying dates was similar in high- and low-Arctic colonies, at a rate of 27% of the advance in date of snowmelt. Although advancement of egg laying did not fully compensate for the advancement of snowmelt, geese laying eggs at intermediate dates in the low Arctic were the most successful breeders. In the high Arctic, however, early nesting geese were the most successful breeders, suggesting that high-Arctic geese have not advanced their laying dates sufficiently to earlier springs. This indicates that high-Arctic geese especially are vulnerable to negative effects of climate warming.

387: The Optimal Timing, Cutoff and Method of Calculation of Preoperative PSA Velocity to Predict Relapse after Prostatectomy: A Report from Search

2007 ◽  
Vol 177 (4S) ◽  
pp. 128-129
Author(s):  
Christopher R. King ◽  
Stephen J. Freedland ◽  
Martha K. Terris ◽  
William J. Aronson ◽  
Christopher J. Kane ◽  
...  
Keyword(s):  
Optimal Timing ◽  
Method Of Calculation ◽  
Psa Velocity
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