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Titolo:
Sexual demographics of riparian populations of Populus deltoides: Can mortality be predicted from a change in reproductive status?
Autore:
Rowland, DL; Johnson, NC;
Indirizzi:
Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA Univ New Mexico Albuquerque NM USA 87131 Biol, Albuquerque, NM 87131 USA No Arizona Univ, Merriam Powell Ctr Environm Res, Flagstaff, AZ 86011 USA No Arizona Univ Flagstaff AZ USA 86011 ironm Res, Flagstaff, AZ 86011 USA
Titolo Testata:
CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE
fascicolo: 6, volume: 79, anno: 2001,
pagine: 702 - 710
SICI:
0008-4026(200106)79:6<702:SDORPO>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
RESOURCE-ALLOCATION; PLANTS; RATIO; COTTONWOOD; PATTERNS; BIOMASS; TREE;
Keywords:
Populus deltoides; sex ratio; Rio Grande basin; reproductive status; nonreproductive;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Rowland, DL Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA Univ NewMexico Albuquerque NM USA 87131 uerque, NM 87131 USA
Citazione:
D.L. Rowland e N.C. Johnson, "Sexual demographics of riparian populations of Populus deltoides: Can mortality be predicted from a change in reproductive status?", CAN J BOTAN, 79(6), 2001, pp. 702-710

Abstract

Populus deltoides var. wislizenii (S. Wats. ) Eckenwalder (cottonwood) forests along the Rio Grande drainage are predicted to disappear within this century. We evaluated stand health over 3 years by examining the sex ratio, size, and spatial distribution of male, female, and nonreproductive trees insix even-aged stands of P. deltoides spanning 280 km along the Rio Grande drainage. There was no evidence of biased sex ratios or spatial segregationof sexes; however, tree mortality was strongly related to reproductive status. In the most stressed population, over half of the mature trees remained nonreproductive and a substantial number switched from reproductive to nonreproductive status. Logistic regression revealed that over all populations, tree size, reproductive status in previous years, and population were significant factors affecting reproduction. By considering physiological and environmental differences, we determined two groups of nonreproductive individuals: those previously reproductive that became nonreproductive and those that remained nonreproductive over the 3 years. The former group appearedto be under greater physiological and environmental stress. Monitoring therate at which individuals change reproductive status provides an effectiveand simple measurement that can predict survival of riparian cottonwood populations.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 08/07/20 alle ore 01:25:20