AustralieFrV1, PascalFrancis, Curation, bibRecord, 005522

Plasticity influencing the light compensation point offsets the specialization for light niches across shrub species in a tropical forest understorey

Identifieur interne : 005522 ( PascalFrancis/Curation ); précédent : 005521; suivant : 005523

Plasticity influencing the light compensation point offsets the specialization for light niches across shrub species in a tropical forest understorey

Auteurs : Frank J. Sterck [Pays-Bas] ; Remko A. Duursma [Australie] ; Robert W. Pearcy [États-Unis] ; Fernando Valladares [Espagne] ; Mikolaj Cieslak [France] ; Monique Weemstra [Pays-Bas, Australie]

Source :

Journal of ecology [ 0022-0477 ] ; 2013.

RBID : Pascal:13-0234186

Descripteurs français

Pascal (Inist)
- Plasticité, Lumière, Point compensation, Spécialisation, Niche écologique, Arbrisseau, Forêt tropicale, Sous étage, Ecophysiologie, Feuille végétal, Adaptation, Interception lumière, Ombrage (environnement), Sciaphyte, Architecture plante.
Wicri :
- topic : Forêt tropicale.

English descriptors

KwdEn :
- Adaptation, Compensation point, Ecological niche, Ecophysiology, Light, Light interception, Plant architecture, Plant leaf, Plasticity, Sciaphyte, Shading, Shrub, Specialization, Tropical forest, Understory.

Abstract

1. Shade tolerance can be defined as the light level at which plants can survive and possibly grow. This light level is referred to as the whole-plant light compensation point (LCP). The LCP depends on multiple leaf and architectural traits. We are still uncertain how often interspecific trait differences allow species to specialize for separate light niches, as observed between shade-tolerant species and light-demanding species. Alternatively, trait plasticity may allow many species to grow in similar light conditions. 2. We measured leaf and architectural traits of up to 1.5-year-old seedlings of 15 sympatric Psychotria shrub species grown at three light levels. We used a 3D plant model to estimate the impacts of leaf traits, architectural traits and plant size on the whole-plant light compensation point (LCP_plant). Plant growth rates were estimated from destructive harvests and allometric relationships. 3. At lower light levels, plants of all species achieved a lower leaf light compensation point (LCP_leaf). The light interception efficiency (LIE), an index of self-shading, decreased with increasing plant size and was therefore lower in high-light treatments where plants grew more rapidly. When corrected for size, LIE was lower in the low-light treatment, possibly as a result of lower investments in woody support. Species did not show trade-offs in growth under low- and high-light conditions, because species with the greatest plasticity in LCP_plant and underlying traits (LCP_leaf and LIE) achieved the highest growth rates at lower light levels. 4. Synthesis. The interspecific differences in LCP_plant did not result in a growth or survival trade-off between low- and high-light conditions. Instead, these differences were more than offset by the greater plasticity in LCP_plantin some species, which was driven by greater plasticity in both leaves and architecture. The most plastic species achieved the fastest growth at different light levels. The results show that plasticity largely neutralizes the separation of light niches amongst species in this forest understorey genus and imply that differential preferences of species for either gaps or forest understorey occur in later life phases or are driven by other stress factors than low light alone.

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C01	`01`		`ENG`	@0 1. Shade tolerance can be defined as the light level at which plants can survive and possibly grow. This light level is referred to as the whole-plant light compensation point (LCP). The LCP depends on multiple leaf and architectural traits. We are still uncertain how often interspecific trait differences allow species to specialize for separate light niches, as observed between shade-tolerant species and light-demanding species. Alternatively, trait plasticity may allow many species to grow in similar light conditions. 2. We measured leaf and architectural traits of up to 1.5-year-old seedlings of 15 sympatric Psychotria shrub species grown at three light levels. We used a 3D plant model to estimate the impacts of leaf traits, architectural traits and plant size on the whole-plant light compensation point (LCP_plant). Plant growth rates were estimated from destructive harvests and allometric relationships. 3. At lower light levels, plants of all species achieved a lower leaf light compensation point (LCP_leaf). The light interception efficiency (LIE), an index of self-shading, decreased with increasing plant size and was therefore lower in high-light treatments where plants grew more rapidly. When corrected for size, LIE was lower in the low-light treatment, possibly as a result of lower investments in woody support. Species did not show trade-offs in growth under low- and high-light conditions, because species with the greatest plasticity in LCP_plant and underlying traits (LCP_leaf and LIE) achieved the highest growth rates at lower light levels. 4. Synthesis. The interspecific differences in LCP_plant did not result in a growth or survival trade-off between low- and high-light conditions. Instead, these differences were more than offset by the greater plasticity in LCP_plantin some species, which was driven by greater plasticity in both leaves and architecture. The most plastic species achieved the fastest growth at different light levels. The results show that plasticity largely neutralizes the separation of light niches amongst species in this forest understorey genus and imply that differential preferences of species for either gaps or forest understorey occur in later life phases or are driven by other stress factors than low light alone.
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Le document en format XML

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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Plasticity influencing the light compensation point offsets the specialization for light niches across shrub species in a tropical forest understorey</title>
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<author><name sortKey="Cieslak, Mikolaj" sort="Cieslak, Mikolaj" uniqKey="Cieslak M" first="Mikolaj" last="Cieslak">Mikolaj Cieslak</name>
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<series><title level="j" type="main">Journal of ecology</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Adaptation</term>
<term>Compensation point</term>
<term>Ecological niche</term>
<term>Ecophysiology</term>
<term>Light</term>
<term>Light interception</term>
<term>Plant architecture</term>
<term>Plant leaf</term>
<term>Plasticity</term>
<term>Sciaphyte</term>
<term>Shading</term>
<term>Shrub</term>
<term>Specialization</term>
<term>Tropical forest</term>
<term>Understory</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Plasticité</term>
<term>Lumière</term>
<term>Point compensation</term>
<term>Spécialisation</term>
<term>Niche écologique</term>
<term>Arbrisseau</term>
<term>Forêt tropicale</term>
<term>Sous étage</term>
<term>Ecophysiologie</term>
<term>Feuille végétal</term>
<term>Adaptation</term>
<term>Interception lumière</term>
<term>Ombrage (environnement)</term>
<term>Sciaphyte</term>
<term>Architecture plante</term>
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<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Forêt tropicale</term>
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<front><div type="abstract" xml:lang="en">1. Shade tolerance can be defined as the light level at which plants can survive and possibly grow. This light level is referred to as the whole-plant light compensation point (LCP). The LCP depends on multiple leaf and architectural traits. We are still uncertain how often interspecific trait differences allow species to specialize for separate light niches, as observed between shade-tolerant species and light-demanding species. Alternatively, trait plasticity may allow many species to grow in similar light conditions. 2. We measured leaf and architectural traits of up to 1.5-year-old seedlings of 15 sympatric Psychotria shrub species grown at three light levels. We used a 3D plant model to estimate the impacts of leaf traits, architectural traits and plant size on the whole-plant light compensation point (LCP<sub>plant</sub>
). Plant growth rates were estimated from destructive harvests and allometric relationships. 3. At lower light levels, plants of all species achieved a lower leaf light compensation point (LCP<sub>leaf</sub>
). The light interception efficiency (LIE), an index of self-shading, decreased with increasing plant size and was therefore lower in high-light treatments where plants grew more rapidly. When corrected for size, LIE was lower in the low-light treatment, possibly as a result of lower investments in woody support. Species did not show trade-offs in growth under low- and high-light conditions, because species with the greatest plasticity in LCP<sub>plant</sub>
 and underlying traits (LCP<sub>leaf</sub>
 and LIE) achieved the highest growth rates at lower light levels. 4. Synthesis. The interspecific differences in LCP<sub>plant</sub>
 did not result in a growth or survival trade-off between low- and high-light conditions. Instead, these differences were more than offset by the greater plasticity in LCP<sub>plant </sub>
in some species, which was driven by greater plasticity in both leaves and architecture. The most plastic species achieved the fastest growth at different light levels. The results show that plasticity largely neutralizes the separation of light niches amongst species in this forest understorey genus and imply that differential preferences of species for either gaps or forest understorey occur in later life phases or are driven by other stress factors than low light alone.</div>
</front>
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<sZ>1 aut.</sZ>
<sZ>6 aut.</sZ>
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<fA14 i1="02"><s1>Hawkesbury Institute for the Environment, University of Western Sydney, Locked Bag 1797</s1>
<s2>Penrith, 2751, NSW</s2>
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<sZ>6 aut.</sZ>
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<s2>Davis, CA 95616</s2>
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<fA14 i1="04"><s1>Museo Nacional de Ciencias Naturales CSIC, Serrano 115 dpdo</s1>
<s2>28006 Madrid</s2>
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<sZ>4 aut.</sZ>
</fA14>
<fA14 i1="05"><s1>INRIA project-team Virtual Plants UMR AGAP, INRA UR 1115 Plantes et Systèmes de Culture Horticoles, 95 rue de la Galéra</s1>
<s2>34095 Montpellier</s2>
<s3>FRA</s3>
<sZ>5 aut.</sZ>
</fA14>
<fA20><s1>971-980</s1>
</fA20>
<fA21><s1>2013</s1>
</fA21>
<fA23 i1="01"><s0>ENG</s0>
</fA23>
<fA43 i1="01"><s1>INIST</s1>
<s2>2004</s2>
<s5>354000503609660140</s5>
</fA43>
<fA44><s0>0000</s0>
<s1>© 2013 INIST-CNRS. All rights reserved.</s1>
</fA44>
<fA45><s0>3/4 p.</s0>
</fA45>
<fA47 i1="01" i2="1"><s0>13-0234186</s0>
</fA47>
<fA60><s1>P</s1>
</fA60>
<fA61><s0>A</s0>
</fA61>
<fA64 i1="01" i2="1"><s0>Journal of ecology</s0>
</fA64>
<fA66 i1="01"><s0>GBR</s0>
</fA66>
<fC01 i1="01" l="ENG"><s0>1. Shade tolerance can be defined as the light level at which plants can survive and possibly grow. This light level is referred to as the whole-plant light compensation point (LCP). The LCP depends on multiple leaf and architectural traits. We are still uncertain how often interspecific trait differences allow species to specialize for separate light niches, as observed between shade-tolerant species and light-demanding species. Alternatively, trait plasticity may allow many species to grow in similar light conditions. 2. We measured leaf and architectural traits of up to 1.5-year-old seedlings of 15 sympatric Psychotria shrub species grown at three light levels. We used a 3D plant model to estimate the impacts of leaf traits, architectural traits and plant size on the whole-plant light compensation point (LCP<sub>plant</sub>
). Plant growth rates were estimated from destructive harvests and allometric relationships. 3. At lower light levels, plants of all species achieved a lower leaf light compensation point (LCP<sub>leaf</sub>
). The light interception efficiency (LIE), an index of self-shading, decreased with increasing plant size and was therefore lower in high-light treatments where plants grew more rapidly. When corrected for size, LIE was lower in the low-light treatment, possibly as a result of lower investments in woody support. Species did not show trade-offs in growth under low- and high-light conditions, because species with the greatest plasticity in LCP<sub>plant</sub>
 and underlying traits (LCP<sub>leaf</sub>
 and LIE) achieved the highest growth rates at lower light levels. 4. Synthesis. The interspecific differences in LCP<sub>plant</sub>
 did not result in a growth or survival trade-off between low- and high-light conditions. Instead, these differences were more than offset by the greater plasticity in LCP<sub>plant </sub>
in some species, which was driven by greater plasticity in both leaves and architecture. The most plastic species achieved the fastest growth at different light levels. The results show that plasticity largely neutralizes the separation of light niches amongst species in this forest understorey genus and imply that differential preferences of species for either gaps or forest understorey occur in later life phases or are driven by other stress factors than low light alone.</s0>
</fC01>
<fC02 i1="01" i2="X"><s0>002A14B01</s0>
</fC02>
<fC02 i1="02" i2="X"><s0>002A33A02</s0>
</fC02>
<fC03 i1="01" i2="X" l="FRE"><s0>Plasticité</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="ENG"><s0>Plasticity</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="SPA"><s0>Plasticidad</s0>
<s5>01</s5>
</fC03>
<fC03 i1="02" i2="X" l="FRE"><s0>Lumière</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="ENG"><s0>Light</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="SPA"><s0>Luz</s0>
<s5>02</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE"><s0>Point compensation</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG"><s0>Compensation point</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA"><s0>Punto compensación</s0>
<s5>03</s5>
</fC03>
<fC03 i1="04" i2="X" l="FRE"><s0>Spécialisation</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG"><s0>Specialization</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA"><s0>Especialización</s0>
<s5>04</s5>
</fC03>
<fC03 i1="05" i2="X" l="FRE"><s0>Niche écologique</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG"><s0>Ecological niche</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="SPA"><s0>Nicho ecológico</s0>
<s5>05</s5>
</fC03>
<fC03 i1="06" i2="X" l="FRE"><s0>Arbrisseau</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="ENG"><s0>Shrub</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="SPA"><s0>Arbusto</s0>
<s5>06</s5>
</fC03>
<fC03 i1="07" i2="X" l="FRE"><s0>Forêt tropicale</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="ENG"><s0>Tropical forest</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="SPA"><s0>Bosque tropical</s0>
<s5>07</s5>
</fC03>
<fC03 i1="08" i2="X" l="FRE"><s0>Sous étage</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="ENG"><s0>Understory</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="SPA"><s0>Subpiso</s0>
<s5>08</s5>
</fC03>
<fC03 i1="09" i2="X" l="FRE"><s0>Ecophysiologie</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="X" l="ENG"><s0>Ecophysiology</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="X" l="SPA"><s0>Ecofisiología</s0>
<s5>09</s5>
</fC03>
<fC03 i1="10" i2="X" l="FRE"><s0>Feuille végétal</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="ENG"><s0>Plant leaf</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="SPA"><s0>Hoja vegetal</s0>
<s5>10</s5>
</fC03>
<fC03 i1="11" i2="X" l="FRE"><s0>Adaptation</s0>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="X" l="ENG"><s0>Adaptation</s0>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="X" l="SPA"><s0>Adaptación</s0>
<s5>11</s5>
</fC03>
<fC03 i1="12" i2="X" l="FRE"><s0>Interception lumière</s0>
<s5>12</s5>
</fC03>
<fC03 i1="12" i2="X" l="ENG"><s0>Light interception</s0>
<s5>12</s5>
</fC03>
<fC03 i1="12" i2="X" l="SPA"><s0>Intercepción luz</s0>
<s5>12</s5>
</fC03>
<fC03 i1="13" i2="X" l="FRE"><s0>Ombrage (environnement)</s0>
<s5>13</s5>
</fC03>
<fC03 i1="13" i2="X" l="ENG"><s0>Shading</s0>
<s5>13</s5>
</fC03>
<fC03 i1="13" i2="X" l="SPA"><s0>Sombrajo</s0>
<s5>13</s5>
</fC03>
<fC03 i1="14" i2="X" l="FRE"><s0>Sciaphyte</s0>
<s5>14</s5>
</fC03>
<fC03 i1="14" i2="X" l="ENG"><s0>Sciaphyte</s0>
<s5>14</s5>
</fC03>
<fC03 i1="14" i2="X" l="SPA"><s0>Esciófilo</s0>
<s5>14</s5>
</fC03>
<fC03 i1="15" i2="X" l="FRE"><s0>Architecture plante</s0>
<s4>CD</s4>
<s5>96</s5>
</fC03>
<fC03 i1="15" i2="X" l="ENG"><s0>Plant architecture</s0>
<s4>CD</s4>
<s5>96</s5>
</fC03>
<fN21><s1>217</s1>
</fN21>
<fN44 i1="01"><s1>OTO</s1>
</fN44>
<fN82><s1>OTO</s1>
</fN82>
</pA>
</standard>
</inist>
</record>

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Plasticity influencing the light compensation point offsets the specialization for light niches across shrub species in a tropical forest understorey

Plasticity influencing the light compensation point offsets the specialization for light niches across shrub species in a tropical forest understorey

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