Nom du corpus

Corpus Systématique Animale

Titre du document

Peculiarities of sexual reproduction in Fagus crenata forests in relation to annual production of reproductive organs

Lien vers le document
Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Mots-clés d'auteur
  • Fagus crenata
  • Pollen
  • Production rates
  • Reproductive organs
  • Seed fertility
Nom du fichier dans la ressource
Insectes_v2b_01937
Auteur(s)
  • Hideki Saito 1
  • Hideyuki Imai 1
  • Masaji Takeoka 1
Affiliation(s)
  • 1) Department of Forestry, Kyoto Prefectural University, Sakyo-ku, 606, Kyoto, Japan
Résumé

Annual production rates of reproductive organs inFagus crenata forests in the lower area of the species' range were studied using 10 litter traps in 1980–1986. The production rates of dispersed pollen were estimated by multiplying the number of fallen male inflorescences per ha per year by the mean amount of pollen per inflorescence before anthesis. Large annual fluctuations in the production rates of male and female inflorescences were recognized, whereas their annual trends were synchronized with each other. Pollen production rates were within the range 1.0–6900 (mean: 1630)×109ha?1 yr?1, the maximum/minimum ratio attaining 7000.F. crenata was the lowest producer of pollen among seven tree species studied: the number of pollen grains equivalent to a single ovule was in the range 6.0–14×104. Furthermore, the mean dry weight of a single pollen grain (3.77×10?5mg) was higher than for wind-pollinated species. Three factors seemed to cause the low seed fertility ofF. crenata. The dry-matter production rate in the best seed year reached 3252 kg ha?1 yr?1, of which pollen accounted for 259 kg ha?1 yr?1. Unproductive years with less than 10% of the maximum production occurred four times in a 7-yr period. In such years there were fewer male and female inflorescences, and more fruit dropped as a result of insect damage. Lower nut dissemination would play an important role in suppressing any increase in nut predators, and fewer flowers would be produced to avoid wastage of photosynthates in a cool-temperate climate.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - biology
  • 3 - ecology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
Catégories Scopus
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Ecology, Evolution, Behavior and Systematics
Catégories WoS
  • 1 - science ; 2 - ecology
Identifiant ISTEX
E50F41771EE7C5CFA67D3D34917F26666B2A3FA6
Revue

Ecological Research

Année de publication
1991
Présence de XML structuré
Non
Version PDF
1.3
Score qualité du texte
9.88
Sous-corpus
  • Insectes
Type de publication
Journal
ark:/67375/1BB-7MNF689H-Q
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