By Michael Fenner

What determines the quantity and measurement of the seeds produced via a plant? How usually should still it reproduce them? Why and the way are seeds dispersed, and what are the consequences for the variety and composition of crops? those are only many of the questions tackled during this wide-ranging evaluation of the function of seeds within the ecology of vegetation. The textual content incorporates a wide selection of recommendations of common relevance to plant ecology, reflecting the valuable function that the learn of seed ecology has performed in elucidating many primary features of plant group functionality.

Show description

Read Online or Download The Ecology of Seeds PDF

Similar botany books

Amazing Numbers in Biology

"This ebook becomes ragged with use. .. .A labour of affection and directory. impressive Numbers is best than googling, since it has a smart index and also you wouldn't have to go through an entire load of irrelevance to get what you will have. it is also logically divided into such sections as 'Size', 'Blood' and 'Germination', and, simply in the event you ever are looking to fee, the entire proof are referenced.

Hormones and Signaling

Hormones and Signaling specializes in the mechanisms of gene rules on the mobile point. It additionally describes the activities of hormones in modulating gene law and animal improvement. Key good points* Glococorticoid and mineralcorticoid signaling* Orphan nuclear receptors* Nuclear receptor coactivators* Cytokines and STAT signaling* Coordination of cAMP signaling occasions via PKA anchoring* G protein-coupled extracellular Ca2+ (Ca2+0)-sensing receptor (CaR)* Pancreatic islet improvement* Genetic research of androgen receptors in improvement and sickness* Antioprogestin regulable gene swap for induction of gene expression in vivo* Steroid receptor knockout version

Aboveground-Belowground Linkages: Biotic Interactions, Ecosystem Processes, and Global Change (Oxford Series in Ecology and Evolution)

Aboveground-Belowground Linkages presents the main updated and entire synthesis of modern advances in our figuring out of the jobs that interactions among aboveground and belowground groups play in regulating the constitution and serve as of terrestrial ecosystems, and their responses to international switch.

Extra resources for The Ecology of Seeds

Example text

Larger individual capitula within a population are more prone to infestation. From Fenner et al. (2002). 43 Pre-dispersal hazards 5 x 5 m area 44 Fig. 4 Incidence of insect damage in capitula of Centaurea nigra through the flowering season. --- number of capitula open in a 5 × 5-m area; •---• % capitula damaged. In this population, early- and late-flowering individuals were more prone to attack. From Fenner (1985). Infestation was at a minimum in mid-season at the peak of flowering (see Fig. 4). Early and late capitula were much more likely to be attacked, suggesting the possibility of a strong stabilizing selective pressure in favour of synchronous flowering in this case.

In Sanicula arctopoides, removal of inflorescences by deer can be compensated for fully by the plant, providing no more than a third of the flowers is lost and the grazing occurs early in the flowering season (Lowenberg, 1994). Similarly, in the wild sunflower Helianthus annuus, removal of the primary capitulum results in the production of more inflorescences, which compensate fully for the initial loss (Pilson & Decker, 2002). For specialist pre-dispersal seed eaters, developing seeds represent an easily accessible source of potential nutrients, as they often contain high concentrations of nutrients such as proteins and oils (Barclay & Earle, 1974) and minerals (Fenner & Lee, 1989) in comparison with the vegetative parts of the plant.

Sarukh´ an (1980) calculated that the palm Astrocaryum mexicanum allocates 37% of annual production to reproduction, but about 32% when calculated over the whole lifetime. The irregular production of seeds in many forest trees would make it necessary to make annual measurements over a very long period. Bazzaz et al. (2000) make a clear distinction between reproductive allocation (RA) and reproductive effort (RE). The latter represents the proportion of resources that are diverted from vegetative activity.

Download PDF sample

Rated 4.70 of 5 – based on 9 votes