✦ LIBER ✦

Energy limitation of hummingbird populations in tropical and temperate communities

✍ Scribed by Robert D. Montgomerie; C. L. Gass

Publisher: Springer-Verlag
Year: 1981
Tongue: English
Weight: 487 KB
Volume: 50
Category: Article
ISSN: 0029-8549
DOI: 10.1007/bf00348031

No coin nor oath required. For personal study only.

✦ Synopsis

Regular censuses were conducted at both a temperate alpine and a tropical lowland site to determine seasonal changes in the composition of hummingbird communities and the availability of their food. From these data we calculated the total daily energy demand by the hummingbirds (Daily Energy Expenditure; DEE) and the daily energy supply available from floral nectar (Daily Energy Production; DEP) for each community census. Despite differences in habitat type and hummingbird community structure between these two sites, the hummingbird populations were often at or near carrying capacity. On average, all of the daily nectar production was cropped by the birds. We suggest that the supply/demand economics of coevolved mutualisms favour the evolution of complete resource use.

📜 SIMILAR VOLUMES

Energy Flows in Populations and Communit

Energy Flows in Populations and Communities of Aquatic Animals

✍ A. F. Alimov 📂 Article 📅 1983 🏛 John Wiley and Sons 🌐 English ⚖ 753 KB

The energy assimilated by single individuals of aquatic animals throughout their life times and by populations and communities of aquatic animals during the growth season has been studied with due regard for the definitive weight of the single individual and the mean biomass of populations and commu

Differences in the effects of parental a

Differences in the effects of parental age on offspring life history between tropical and temperate populations of milkweed bugs (Oncopeltusspp.)

✍ John P. Phelan; Peter C. Frumhoff 📂 Article 📅 1991 🏛 Springer Netherlands 🌐 English ⚖ 822 KB

Communication: The insertion of silylene

Communication: The insertion of silylene in CH bonds; rate constant limits and the energy barrier

✍ Rosa Becerra; Robin Walsh 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 113 KB

The technique of laser flash photolysis has been used to set limits on the rate constants for the bimolecular reactions of SiH 2 with methane (CH 4 ) and tetramethylsilane (SiMe 4 ) at both ambient and elevated temperatures (ca 600 K). These limits show that the energy barriers to insertion reaction

ADL dependence in the elderly population

ADL dependence in the elderly population living in the community: the influence of functional limitations and physical environmental demand

✍ Susanne Iwarsson; ÅKe Isacsson; Jan Lanke 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 154 KB

Empirical research elucidating the relationships between aspects of functional competence and environmental factors is lacking. This study aimed to analyse how functional limitations in the individual and housing accessibility problems influence ADL dependence in the elderly population, and to test

Secondary materials in domestic refuse a

Secondary materials in domestic refuse as energy sources: A report prepared for the Environment and Consumer Protection Service of the Commission of the European Communities by Europool; Graham & Trotman Limited, London, 1977, iii + 72 pages

📂 Article 📅 1979 🏛 Elsevier Science ⚖ 132 KB