Reproductive Allocation and Size Constraints in the Cladoceran Simocephalus vetulus (Muller)

1989 ◽  
Vol 3 (3) ◽  
pp. 279 ◽  
Author(s):  
N. Perrin
Keyword(s):  
Reproductive Allocation ◽  
Simocephalus Vetulus ◽  
Size Constraints

An explanation for size-dependent reproductive allocation in Plantago major

1998 ◽  
Vol 76 (1) ◽  
pp. 43-50 ◽  
Author(s):  
Edward G Reekie
Keyword(s):  
Life History Theory ◽  
Reproductive Output ◽  
Direct Consequence ◽  
Reproductive Allocation ◽  
Reproductive Cost ◽  
Trade Off ◽  
Size Dependent ◽  
Size Constraints ◽  
Controlled Environments ◽  
Size And Morphology

This study examined whether variation in reproductive allocation with size could be explained by differences in the trade-off between reproduction and growth. Seeds from 42 half-sibling families were collected from sites differing in mowing frequency and availability of light, nutrients, and water. Six seedlings from each family were grown in controlled environments and photoperiod manipulations were used to control reproduction. Mass of vegetative and reproductive plants of the same family were compared to assess the trade-off between reproduction and growth. Families collected from habitats with a tall canopy were larger and experienced a greater decrease in growth with reproduction than families from habitats where mowing maintained a short canopy. Reproductive output showed no relationship with size, while reproductive allocation (capsule mass to vegetative mass) decreased with size. This decrease may be a direct consequence of the increase in reproductive cost with size. The increase in cost can be partially explained by increased allocation to reproductive support structures; large individuals produce capsules on more elongate scapes and have a lower capsule to scape ratio. Differences in size and morphology among habitats are presumably the result of selection to avoid damage in mown sites and to avoid shade and ensure pollination in sites with a tall canopy and reduced wind movement.Key words: allometry, life-history theory, size constraints, reproductive effort, reproductive cost.

Production-dependent reproductive allocation of a tall tree speciesQuercus serrata

1997 ◽  
Vol 110 (1) ◽  
pp. 7-13 ◽  
Author(s):  
Tohru Nakashizuka ◽  
Yayoi Takahashi ◽  
Hideyuki Kawaguchi
Keyword(s):  
Reproductive Allocation ◽  
Tall Tree

Program GROUP: The Identification of All Possible Solutions to a Constituency-Delimitation Problem

1981 ◽  
Vol 13 (2) ◽  
pp. 231-238 ◽  
Author(s):  
D J Rossiter ◽  
R J Johnston
Keyword(s):  
Computer Program ◽  
Local Authority ◽  
Seminal Work ◽  
Size Constraints ◽  
Voter Opinion

A computer program is designed to produce all of the electoral constituencies for an English local authority, within the constraints imposed on the Parliamentary Boundary Commissioners. This builds on the seminal work of Gudgin and Taylor, and introduces size constraints, evaluates shape, and evaluates the electoral consequences of swings in voter opinion.

scholarly journals Quantifying and understanding reproductive allocation schedules in plants

2015 ◽  
Vol 5 (23) ◽  
pp. 5521-5538 ◽  
Author(s):  
Elizabeth Hedi Wenk ◽  
Daniel S. Falster
Keyword(s):  
Reproductive Allocation
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