Size structure of populations within populations: leaf number and size in crowded and uncrowded Impatiens pallida individuals

Glenn M. Berntson; Jacob Weiner

doi:10.1007/BF00320607

Size structure of populations within populations: leaf number and size in crowded and uncrowded Impatiens pallida individuals

Glenn M. Berntson, Jacob Weiner^*

^*Corresponding author af dette arbejde

SOBI

11 Citationer (Scopus)

Abstract

We compared the size distributions of leaves on naturally-occurring crowded and experimentally thinned "uncrowded" individuals of Impatiens pallida in southeastern Pennsylvania. Crowding decreased the number of leaves on individual plants and altered the distribution of leaf size. Crowded individuals had smaller leaves, but the size (length) inequality of the leaf population did not change. The relationships between the height of a plant and the mean and maximum length of its leaves were significantly different for crowded and uncrowded plants. There were weak positive relationships between height and total leaf area, and height and total number of leaves for uncrowded plants, whereas crowded plants showed tighter but curvilinear relationships between these variables. Our results point out the strengths and the limitations of viewing canopies as populations of modules.

Originalsprog	Engelsk
Tidsskrift	Oecologia
Vol/bind	85
Udgave nummer	3
Sider (fra-til)	327-331
Antal sider	5
ISSN	0029-8549
DOI	https://doi.org/10.1007/BF00320607
Status	Udgivet - 1 jan. 1991

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@article{91342a03348f430c94f9d4b97be5271d,

title = "Size structure of populations within populations: leaf number and size in crowded and uncrowded Impatiens pallida individuals",

abstract = "We compared the size distributions of leaves on naturally-occurring crowded and experimentally thinned {"}uncrowded{"} individuals of Impatiens pallida in southeastern Pennsylvania. Crowding decreased the number of leaves on individual plants and altered the distribution of leaf size. Crowded individuals had smaller leaves, but the size (length) inequality of the leaf population did not change. The relationships between the height of a plant and the mean and maximum length of its leaves were significantly different for crowded and uncrowded plants. There were weak positive relationships between height and total leaf area, and height and total number of leaves for uncrowded plants, whereas crowded plants showed tighter but curvilinear relationships between these variables. Our results point out the strengths and the limitations of viewing canopies as populations of modules.",

keywords = "Competition, Demography, Impatiens pallida, Modules, Size",

author = "Berntson, {Glenn M.} and Jacob Weiner",

year = "1991",

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doi = "10.1007/BF00320607",

language = "English",

volume = "85",

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journal = "Oecologia",

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TY - JOUR

T1 - Size structure of populations within populations

T2 - leaf number and size in crowded and uncrowded Impatiens pallida individuals

AU - Berntson, Glenn M.

AU - Weiner, Jacob

PY - 1991/1/1

Y1 - 1991/1/1

N2 - We compared the size distributions of leaves on naturally-occurring crowded and experimentally thinned "uncrowded" individuals of Impatiens pallida in southeastern Pennsylvania. Crowding decreased the number of leaves on individual plants and altered the distribution of leaf size. Crowded individuals had smaller leaves, but the size (length) inequality of the leaf population did not change. The relationships between the height of a plant and the mean and maximum length of its leaves were significantly different for crowded and uncrowded plants. There were weak positive relationships between height and total leaf area, and height and total number of leaves for uncrowded plants, whereas crowded plants showed tighter but curvilinear relationships between these variables. Our results point out the strengths and the limitations of viewing canopies as populations of modules.

AB - We compared the size distributions of leaves on naturally-occurring crowded and experimentally thinned "uncrowded" individuals of Impatiens pallida in southeastern Pennsylvania. Crowding decreased the number of leaves on individual plants and altered the distribution of leaf size. Crowded individuals had smaller leaves, but the size (length) inequality of the leaf population did not change. The relationships between the height of a plant and the mean and maximum length of its leaves were significantly different for crowded and uncrowded plants. There were weak positive relationships between height and total leaf area, and height and total number of leaves for uncrowded plants, whereas crowded plants showed tighter but curvilinear relationships between these variables. Our results point out the strengths and the limitations of viewing canopies as populations of modules.

KW - Competition

KW - Demography

KW - Impatiens pallida

KW - Modules

KW - Size

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U2 - 10.1007/BF00320607

DO - 10.1007/BF00320607

M3 - Journal article

AN - SCOPUS:0026096315

SN - 0029-8519

VL - 85

SP - 327

EP - 331

JO - Oecologia

JF - Oecologia

IS - 3

ER -

Size structure of populations within populations: leaf number and size in crowded and uncrowded Impatiens pallida individuals

Abstract

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