Life cycle characteristics of Machaeranthera gracilis (Compositae) in desert habitats

Russell Monson, Stan R. Szarek

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Plant population dynamics and life cycle characteristics are presented for two genetically related, yet ecologically distinct, chromosomal races of Machaeranthera gracilis (Nutt.) Shinners. Seedling mortality was very high for a field population of the desert race (n=2) as only 8% of the maximum number of seedlings produced did survive to the period of peak reproduction. Lower mortality occurred in the foothills race (n=4) as 15% of the maximum number of seedlings produced did survive until the period of peak reproduction. The desert race also exhibited the capacity to assume the perennial growth habit. Perennial plants of the desert race produced 4.4 heads/plant (116 heads/m2) versus 0.2 heads/plant (4 heads/m2) for annual plants of the desert race under field conditions. Annual plants of the foothills race produced 2.7 heads/plant (75 heads/m2). The perennial habit did not occur in field populations of the foothills race. When grown in identical glasshouse conditions the desert race reached anthesis of the first four flower heads ca. 25 days prior to the foothills race. This acceleration to anthesis was accompanied by a greater potential reproductive allocation. The latter response was due in part to greater biomass allocation to reproductive structures at the expense of vegetative structures, and the uncoupling of net photosynthesis from phenological events.

Original languageEnglish (US)
Pages (from-to)50-55
Number of pages6
JournalOecologia
Volume49
Issue number1
DOIs
StatePublished - May 1981

Fingerprint

Xanthisma gracile
Asteraceae
deserts
life cycle (organisms)
life cycle
desert
habitat
habitats
xerophytes
annual plant
seedling
seedlings
flowering
mortality
perennial plant
reproductive potential
biomass allocation
growth habit
dry matter partitioning
flower

ASJC Scopus subject areas

  • Ecology

Cite this

Life cycle characteristics of Machaeranthera gracilis (Compositae) in desert habitats. / Monson, Russell; Szarek, Stan R.

In: Oecologia, Vol. 49, No. 1, 05.1981, p. 50-55.

Research output: Contribution to journalArticle

@article{22361666b6154942b4ec1481e403a932,
title = "Life cycle characteristics of Machaeranthera gracilis (Compositae) in desert habitats",
abstract = "Plant population dynamics and life cycle characteristics are presented for two genetically related, yet ecologically distinct, chromosomal races of Machaeranthera gracilis (Nutt.) Shinners. Seedling mortality was very high for a field population of the desert race (n=2) as only 8{\%} of the maximum number of seedlings produced did survive to the period of peak reproduction. Lower mortality occurred in the foothills race (n=4) as 15{\%} of the maximum number of seedlings produced did survive until the period of peak reproduction. The desert race also exhibited the capacity to assume the perennial growth habit. Perennial plants of the desert race produced 4.4 heads/plant (116 heads/m2) versus 0.2 heads/plant (4 heads/m2) for annual plants of the desert race under field conditions. Annual plants of the foothills race produced 2.7 heads/plant (75 heads/m2). The perennial habit did not occur in field populations of the foothills race. When grown in identical glasshouse conditions the desert race reached anthesis of the first four flower heads ca. 25 days prior to the foothills race. This acceleration to anthesis was accompanied by a greater potential reproductive allocation. The latter response was due in part to greater biomass allocation to reproductive structures at the expense of vegetative structures, and the uncoupling of net photosynthesis from phenological events.",
author = "Russell Monson and Szarek, {Stan R.}",
year = "1981",
month = "5",
doi = "10.1007/BF00376897",
language = "English (US)",
volume = "49",
pages = "50--55",
journal = "Oecologia",
issn = "0029-8549",
publisher = "Springer Verlag",
number = "1",

}

TY - JOUR

T1 - Life cycle characteristics of Machaeranthera gracilis (Compositae) in desert habitats

AU - Monson, Russell

AU - Szarek, Stan R.

PY - 1981/5

Y1 - 1981/5

N2 - Plant population dynamics and life cycle characteristics are presented for two genetically related, yet ecologically distinct, chromosomal races of Machaeranthera gracilis (Nutt.) Shinners. Seedling mortality was very high for a field population of the desert race (n=2) as only 8% of the maximum number of seedlings produced did survive to the period of peak reproduction. Lower mortality occurred in the foothills race (n=4) as 15% of the maximum number of seedlings produced did survive until the period of peak reproduction. The desert race also exhibited the capacity to assume the perennial growth habit. Perennial plants of the desert race produced 4.4 heads/plant (116 heads/m2) versus 0.2 heads/plant (4 heads/m2) for annual plants of the desert race under field conditions. Annual plants of the foothills race produced 2.7 heads/plant (75 heads/m2). The perennial habit did not occur in field populations of the foothills race. When grown in identical glasshouse conditions the desert race reached anthesis of the first four flower heads ca. 25 days prior to the foothills race. This acceleration to anthesis was accompanied by a greater potential reproductive allocation. The latter response was due in part to greater biomass allocation to reproductive structures at the expense of vegetative structures, and the uncoupling of net photosynthesis from phenological events.

AB - Plant population dynamics and life cycle characteristics are presented for two genetically related, yet ecologically distinct, chromosomal races of Machaeranthera gracilis (Nutt.) Shinners. Seedling mortality was very high for a field population of the desert race (n=2) as only 8% of the maximum number of seedlings produced did survive to the period of peak reproduction. Lower mortality occurred in the foothills race (n=4) as 15% of the maximum number of seedlings produced did survive until the period of peak reproduction. The desert race also exhibited the capacity to assume the perennial growth habit. Perennial plants of the desert race produced 4.4 heads/plant (116 heads/m2) versus 0.2 heads/plant (4 heads/m2) for annual plants of the desert race under field conditions. Annual plants of the foothills race produced 2.7 heads/plant (75 heads/m2). The perennial habit did not occur in field populations of the foothills race. When grown in identical glasshouse conditions the desert race reached anthesis of the first four flower heads ca. 25 days prior to the foothills race. This acceleration to anthesis was accompanied by a greater potential reproductive allocation. The latter response was due in part to greater biomass allocation to reproductive structures at the expense of vegetative structures, and the uncoupling of net photosynthesis from phenological events.

UR - http://www.scopus.com/inward/record.url?scp=0004244063&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0004244063&partnerID=8YFLogxK

U2 - 10.1007/BF00376897

DO - 10.1007/BF00376897

M3 - Article

VL - 49

SP - 50

EP - 55

JO - Oecologia

JF - Oecologia

SN - 0029-8549

IS - 1

ER -