Related Experiment Video
Updated: Jun 5, 2026
06:00
Experimental Manipulation of Body Size to Estimate Morphological Scaling Relationships in Drosophila
Published on: October 1, 2011
Comparative evolutionary ecology of seed size.
M Westoby1, E Jurado, M Leishman
1Mark Westoby and Michelle Leishman are at the School of Biological Sciences and Research Unit for Biodiversity and Bioresources, Macquarie University, NSW 2109, Australia.
Trends in Ecology & Evolution
|January 18, 2011
Summary
Seed size impacts seedling establishment success. Larger seeds offer more resources, but evolutionary trade-offs exist, with experimental evidence still emerging for specific benefits.
Area of Science:
- Plant biology
- Evolutionary ecology
Background:
- Seedling establishment is influenced by seed reserves.
- Seed size evolves as a trade-off between seed number and resources per seed.
- Species exhibit vast seed size variation (10^11-fold), indicating diverse evolutionary compromises.
Purpose of the Study:
- To review experimental evidence on the adaptive benefits of large seed size.
- To assess the relationship between seed size and seedling establishment under various environmental pressures.
Main Methods:
- Literature review of studies investigating seed size and establishment.
- Analysis of experimental data testing seed size benefits against specific environmental hazards.
Main Results:
- Large seed size is often interpreted as adaptive to environmental hazards.
- Experimental tests for these benefits have been infrequent.
- Emerging experimental data show inconsistent patterns regarding seed size advantages.
Conclusions:
- The adaptive significance of seed size variation requires further experimental validation.
- Seed size evolution is complex, potentially linked to other plant traits.
- A consistent understanding of seed size benefits across different hazards is yet to be established.
Related Concept Videos
01:46Types of Selection
Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
02:33Seed Structure and Early Development of the Sporophyte
Seed structures are composed of a protective seed coat surrounding a plant embryo, and a food store for the developing embryo. The embryo contains the precursor tissues for leaves, stem, and roots. The endosperm and cotyledons—seed leaves—act as the food reserves for the growing embryo.
02:26Non-vascular Seedless Plants
The diverse plant life on Earth—consisting of nearly 400,000 species—can be divided into three broad categories based on biological characteristics: nonvascular, seedless vascular, and seed plants.
00:51Energy Budgets and Reproductive Strategies
Organisms must balance energy intake with the energy required for growth, maintenance, and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species reproduce only once in their lifetime, often investing most available resources into that single reproductive event. Iteroparous species, by contrast, reproduce multiple times over their lifetimes, typically allocating fewer resources to any single...
03:40Introduction to Seed Plants
Most plants are seed plants—characterized by seeds, pollen, and reduced gametophytes. Seed plants include gymnosperms and angiosperms.
02:16Genetics of Speciation
Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...