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Measuring the Mechanical Properties of Plant Cell Walls. PLANTS 2015; 4:167-82. [PMID: 27135321 PMCID: PMC4844320 DOI: 10.3390/plants4020167] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Revised: 03/05/2015] [Accepted: 03/11/2015] [Indexed: 11/21/2022]
Abstract
The size, shape and stability of a plant depend on the flexibility and integrity of its cell walls, which, at the same time, need to allow cell expansion for growth, while maintaining mechanical stability. Biomechanical studies largely vanished from the focus of plant science with the rapid progress of genetics and molecular biology since the mid-twentieth century. However, the development of more sensitive measurement tools renewed the interest in plant biomechanics in recent years, not only to understand the fundamental concepts of growth and morphogenesis, but also with regard to economically important areas in agriculture, forestry and the paper industry. Recent advances have clearly demonstrated that mechanical forces play a crucial role in cell and organ morphogenesis, which ultimately define plant morphology. In this article, we will briefly review the available methods to determine the mechanical properties of cell walls, such as atomic force microscopy (AFM) and microindentation assays, and discuss their advantages and disadvantages. But we will focus on a novel methodological approach, called cellular force microscopy (CFM), and its automated successor, real-time CFM (RT-CFM).
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202
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Kozlov MV, Filippov BY, Zubrij NA, Zverev V. Abrupt changes in invertebrate herbivory on woody plants at the forest–tundra ecotone. Polar Biol 2015. [DOI: 10.1007/s00300-015-1655-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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203
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Malishev M, Sanson GD. Leaf mechanics and herbivory defence: How tough tissue along the leaf body deters growing insect herbivores. AUSTRAL ECOL 2015. [DOI: 10.1111/aec.12214] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matthew Malishev
- Centre of Excellence for Biosecurity Risk Analysis (CEBRA); School of Botany; University of Melbourne; Melbourne Victoria Australia
| | - Gordon D. Sanson
- School of Biological Sciences; Monash University; Melbourne Victoria Australia
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204
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Nagai S, Saitoh TM, Nasahara KN, Suzuki R. Spatio-temporal distribution of the timing of start and end of growing season along vertical and horizontal gradients in Japan. INTERNATIONAL JOURNAL OF BIOMETEOROLOGY 2015; 59:47-54. [PMID: 24781316 DOI: 10.1007/s00484-014-0822-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2013] [Revised: 03/12/2014] [Accepted: 03/12/2014] [Indexed: 06/03/2023]
Abstract
We detected the spatio-temporal variability in the timing of start (SGS) and end of growing season (EGS) in Japan from 2003 to 2012 by analyzing satellite-observed daily green-red vegetation index with a 500-m spatial resolution. We also examined the characteristics of SGS and EGS timing in deciduous broadleaf and needleleaf forests along vertical and horizontal gradients and then evaluated the relationship between their timing and daily mean air temperature. We found that for the timing of SGS and EGS, changes along the vertical gradient in deciduous broadleaf forest tended to be larger than those in deciduous needleleaf forest. For both forest types, changes along the vertical and horizontal gradients in the timing of EGS tended to be smaller than those of SGS. Finally, in both forest types, the sensitivity of the timing of EGS to air temperature was much less than that of SGS. These results suggest that the spatio-temporal variability in the timing of SGS and EGS detected by satellite data, which may be correlated with leaf traits, photosynthetic capacity, and environment conditions, provide useful ground-truthing information along vertical and horizontal gradients.
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Affiliation(s)
- Shin Nagai
- Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, 236-0001, Japan,
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205
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Muir CD, Pease JB, Moyle LC. Quantitative genetic analysis indicates natural selection on leaf phenotypes across wild tomato species (Solanum sect. Lycopersicon; Solanaceae). Genetics 2014; 198:1629-43. [PMID: 25298519 PMCID: PMC4256776 DOI: 10.1534/genetics.114.169276] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Accepted: 10/04/2014] [Indexed: 02/06/2023] Open
Abstract
Adaptive evolution requires both raw genetic material and an accessible path of high fitness from one fitness peak to another. In this study, we used an introgression line (IL) population to map quantitative trait loci (QTL) for leaf traits thought to be associated with adaptation to precipitation in wild tomatoes (Solanum sect. Lycopersicon; Solanaceae). A QTL sign test showed that several traits likely evolved under directional natural selection. Leaf traits correlated across species do not share a common genetic basis, consistent with a scenario in which selection maintains trait covariation unconstrained by pleiotropy or linkage disequilibrium. Two large effect QTL for stomatal distribution colocalized with key genes in the stomatal development pathway, suggesting promising candidates for the molecular bases of adaptation in these species. Furthermore, macroevolutionary transitions between vastly different stomatal distributions may not be constrained when such large-effect mutations are available. Finally, genetic correlations between stomatal traits measured in this study and data on carbon isotope discrimination from the same ILs support a functional hypothesis that the distribution of stomata affects the resistance to CO2 diffusion inside the leaf, a trait implicated in climatic adaptation in wild tomatoes. Along with evidence from previous comparative and experimental studies, this analysis indicates that leaf traits are an important component of climatic niche adaptation in wild tomatoes and demonstrates that some trait transitions between species could have involved few, large-effect genetic changes, allowing rapid responses to new environmental conditions.
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Affiliation(s)
- Christopher D Muir
- Biodiversity Research Centre and Botany Department, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4 Department of Biology, Indiana University, Bloomington, Indiana 47405
| | - James B Pease
- Department of Biology, Indiana University, Bloomington, Indiana 47405
| | - Leonie C Moyle
- Department of Biology, Indiana University, Bloomington, Indiana 47405
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206
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Muir CD, Hangarter RP, Moyle LC, Davis PA. Morphological and anatomical determinants of mesophyll conductance in wild relatives of tomato (Solanum sect. Lycopersicon, sect. Lycopersicoides; Solanaceae). PLANT, CELL & ENVIRONMENT 2014; 37:1415-1426. [PMID: 24279358 DOI: 10.1111/pce.12245] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2013] [Revised: 11/19/2013] [Accepted: 11/21/2013] [Indexed: 06/02/2023]
Abstract
Natural selection on photosynthetic performance is a primary factor determining leaf phenotypes. The complex CO2 diffusion path from substomatal cavities to the chloroplasts - the mesophyll conductance (g(m)) - limits photosynthetic rate in many species and hence shapes variation in leaf morphology and anatomy. Among sclerophyllous and succulent taxa, structural investment in leaves, measured as the leaf dry mass per area (LMA), has been implicated in decreased gm . However, in herbaceous taxa with high g(m), it is less certain how LMA impacts CO2 diffusion and whether it significantly affects photosynthetic performance. We addressed these questions in the context of understanding the ecophysiological significance of leaf trait variation in wild tomatoes, a closely related group of herbaceous perennials. Although g(m) was high in wild tomatoes, variation in g(m) significantly affected photosynthesis. Even in these tender-leaved herbaceous species, greater LMA led to reduced g(m). This relationship between g(m) and LMA is partially mediated by cell packing and leaf thickness, although amphistomy (equal distribution of stomata on both sides of the leaf) mitigates the effect of leaf thickness. Understanding the costs of increased LMA will inform future work on the adaptive significance of leaf trait variation across ecological gradients in wild tomatoes and other systems.
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207
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Nakadai R, Murakami M, Hirao T. Effects of phylogeny, leaf traits, and the altitudinal distribution of host plants on herbivore assemblages on congeneric Acer species. Oecologia 2014; 175:1237-45. [PMID: 24879058 DOI: 10.1007/s00442-014-2964-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Accepted: 05/05/2014] [Indexed: 12/01/2022]
Abstract
Historical, niche-based, and stochastic processes have been proposed as the mechanisms that drive community assembly. In plant-herbivore systems, these processes can correspond to phylogeny, leaf traits, and the distribution of host plants, respectively. Although patterns of herbivore assemblages among plant species have been repeatedly examined, the effects of these factors among co-occurring congeneric host plant species have rarely been studied. Our aim was to reveal the process of community assembly for herbivores by investigating the effects of phylogeny, leaf traits, and the altitudinal distribution of closely related host plants of the genus Acer. We sampled leaf functional traits for 30 Acer species in Japan. Using a newly constructed phylogeny, we determined that three of the six measured leaf traits (leaf thickness, C/N ratio, and condensed tannin content) showed a phylogenetic signal. In a field study, we sampled herbivore communities on 14 Acer species within an elevation gradient and examined relationships between herbivore assemblages and host plants. We found that herbivore assemblages were significantly correlated with phylogeny, leaf traits, phylogenetic signals, and the altitudinal distribution of host plants. Our results indicate that the interaction between historical and current ecological processes shapes herbivore community assemblages.
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208
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Prado A, Sierra A, Windsor D, Bede JC. Leaf traits and herbivory levels in a tropical gymnosperm, Zamia stevensonii (Zamiaceae). AMERICAN JOURNAL OF BOTANY 2014; 101:437-447. [PMID: 24638164 DOI: 10.3732/ajb.1300337] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
PREMISE OF THE STUDY Slow-growing understory cycads invest heavily in defenses to protect the few leaves they produce annually. The Neotropical cycad Zamia stevensonii has chemical and mechanical barriers against insect herbivores. Mechanical barriers, such as leaf toughness, can be established only after the leaf has expanded. Therefore, chemical defenses may be important during leaf expansion. How changes in leaf traits affect the feeding activity of cycad specialist insects is unknown. We investigated leaf defenses and incidence of specialist herbivores on Z. stevensonii during the first year after leaf flush. METHODS Herbivore incidence, leaf production, and leaf traits that might affect herbivory-including leaf age, lamina thickness, resistance-to-fracture, work-to-fracture, trichome density, and chlorophyll, water, and toxic azoxyglycoside (AZG) content-were measured throughout leaf development. Principal component analysis and generalized linear models identified characteristics that may explain herbivore incidence. KEY RESULTS Synchronized leaf development in Z. stevensonii is characterized by quick leaf expansion and delayed greening. Specialist herbivores feed on leaves between 10 and 100 d after flush and damage ∼37% of all leaflets produced. Young leaves are protected by AZGs, but these defenses rapidly decrease as leaves expand. Leaves older than 100 d are protected by toughness. CONCLUSIONS Because AZG concentrations drop before leaves become sufficiently tough, there is a vulnerable period during which leaves are susceptible to herbivory by specialist insects. This slow-growing gymnosperm invests heavily in constitutive defenses against highly specialized herbivores, underlining the convergence in defensive syndromes by major plant lineages.
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Affiliation(s)
- Alberto Prado
- Department of Plant Science, McGill University, 21,111 Lakeshore Road, Ste.-Anne-de-Bellevue, Québec, Canada
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209
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Gleason SM, Blackman CJ, Cook AM, Laws CA, Westoby M. Whole-plant capacitance, embolism resistance and slow transpiration rates all contribute to longer desiccation times in woody angiosperms from arid and wet habitats. TREE PHYSIOLOGY 2014; 34:275-284. [PMID: 24550089 DOI: 10.1093/treephys/tpu001] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Low water potentials in xylem can result in damaging levels of cavitation, yet little is understood about which hydraulic traits have most influence in delaying the onset of hydraulic dysfunction during periods of drought. We examined three traits contributing to longer desiccation times in excised shoots of 11 species from two sites of contrasting aridity: (i) the amount of water released from plant tissues per decrease in xylem water potential (WΨ); (ii) the minimum xylem water potential preceding acute water stress (defined as P50L; water potential at 50% loss of leaf conductance); and (iii) the integrated transpiration rate between the points of full hydration and P50L (Wtime). The time required for species to reach P50L varied markedly, ranging from 1.3 h to nearly 3 days. WΨ, P50L and Wtime all contributed significantly to longer desiccation times, explaining 28, 22 and 50% of the variance in the time required to reach P50L. Interestingly, these three traits were nearly orthogonal to one another, suggesting that they do not represent alternative hydraulic strategies, but likely trade off with other ecological strategies not evaluated in this study. The majority of water lost during desiccation (60-91%) originated from leaves, suggesting an important role for leaf capacitance in small plants when xylem water potentials decrease below -2 MPa.
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Affiliation(s)
- Sean M Gleason
- Department of Biological Sciences, Macquarie University, North Ryde, New South Wales 2109, Australia
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210
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Houter NC, Pons TL. Gap effects on leaf traits of tropical rainforest trees differing in juvenile light requirement. Oecologia 2014; 175:37-50. [DOI: 10.1007/s00442-014-2887-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Accepted: 01/11/2014] [Indexed: 11/24/2022]
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211
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Lohbeck M, Poorter L, Martínez-Ramos M, Rodriguez-Velázquez J, van Breugel M, Bongers F. Changing drivers of species dominance during tropical forest succession. Funct Ecol 2014. [DOI: 10.1111/1365-2435.12240] [Citation(s) in RCA: 93] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Madelon Lohbeck
- Forest Ecology and Forest Management group; Wageningen University; PO Box 47 6700 AA Wageningen The Netherlands
- Centro de Investigaciones en Ecosistemas; Universidad Nacional Autónoma de México; Antigua Carretera a Patzcuaro 8701 Ex-hacienda de San Jose de la Huerta 58190 Morelia Michoacan Mexico
| | - Lourens Poorter
- Forest Ecology and Forest Management group; Wageningen University; PO Box 47 6700 AA Wageningen The Netherlands
| | - Miguel Martínez-Ramos
- Centro de Investigaciones en Ecosistemas; Universidad Nacional Autónoma de México; Antigua Carretera a Patzcuaro 8701 Ex-hacienda de San Jose de la Huerta 58190 Morelia Michoacan Mexico
| | - Jorge Rodriguez-Velázquez
- Centro de Investigaciones en Ecosistemas; Universidad Nacional Autónoma de México; Antigua Carretera a Patzcuaro 8701 Ex-hacienda de San Jose de la Huerta 58190 Morelia Michoacan Mexico
| | - Michiel van Breugel
- Smithsonian Tropical Research Institute; Apartado 0843-03092 Ancón Balboa Panama
| | - Frans Bongers
- Forest Ecology and Forest Management group; Wageningen University; PO Box 47 6700 AA Wageningen The Netherlands
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212
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Faecal particle size in free-ranging primates supports a ‘rumination’ strategy in the proboscis monkey (Nasalis larvatus). Oecologia 2014; 174:1127-37. [DOI: 10.1007/s00442-013-2863-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Accepted: 12/11/2013] [Indexed: 10/25/2022]
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213
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Foucreau N, Piscart C, Puijalon S, Hervant F. Effect of climate-related change in vegetation on leaf litter consumption and energy storage by Gammarus pulex from Continental or Mediterranean populations. PLoS One 2013; 8:e77242. [PMID: 24204778 PMCID: PMC3799701 DOI: 10.1371/journal.pone.0077242] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2013] [Accepted: 08/31/2013] [Indexed: 11/18/2022] Open
Abstract
As a consequence of global warming, it is important to characterise the potential changes occurring for some functional processes through the intra-specific study of key species. Changes in species distribution, particularly when key or engineer species are affected, should contribute to global changes in ecosystem functioning. In this study, we examined the potential consequences induced by global warming on ecosystem functioning in term of organic matter recycling. We compared consumption of leaf litter by some shredder populations (Gammarus pulex) between five tree species inhabiting continental (i.e., the northern region of the Rhône River Valley) and/or Mediterranean (i.e., the southern region of the Rhône River Valley) conditions. To consider any potential adaptation of the gammarid population to vegetation in the same climate conditions, three populations of the key shredder Gammarus pulex from the northern region and three from the southern region of the Rhône River Valley were used. We experimentally compared the effects of the geographical origin of both the gammarid populations and the leaf litter species on the shredding activity and the physiological state of animals (through body triglyceride content). This study demonstrated that leaf toughness is more important than geographical origin for determining shredder leaf litter consumption. The overall consumption rate of the gammarid populations from the southern region of Rhône Valley was much higher than that of the populations from the northern region, but no clear differences between the origins of the leaf litter (i.e., continental vs. Mediterranean) were observed. The northwards shift of G. pulex populations adapted to warmer conditions might significantly modify organic matter recycling in continental streams. As gammarid populations can demonstrate local adaptations to certain leaf species as a trophic resource, changes in riparian vegetation associated with climate change might locally affect the leaf litter degradation process by this shredder.
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Affiliation(s)
- Natacha Foucreau
- UMR 5023 Ecologie des Hydrosystèmes Naturels et Anthropisés; Université de Lyon; Université Lyon 1; ENTPE; CNRS; Villeurbanne, France
- * E-mail:
| | - Christophe Piscart
- UMR 5023 Ecologie des Hydrosystèmes Naturels et Anthropisés; Université de Lyon; Université Lyon 1; ENTPE; CNRS; Villeurbanne, France
| | - Sara Puijalon
- UMR 5023 Ecologie des Hydrosystèmes Naturels et Anthropisés; Université de Lyon; Université Lyon 1; ENTPE; CNRS; Villeurbanne, France
| | - Frédéric Hervant
- UMR 5023 Ecologie des Hydrosystèmes Naturels et Anthropisés; Université de Lyon; Université Lyon 1; ENTPE; CNRS; Villeurbanne, France
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214
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Moulia B. Plant biomechanics and mechanobiology are convergent paths to flourishing interdisciplinary research. JOURNAL OF EXPERIMENTAL BOTANY 2013; 64:4617-33. [PMID: 24193603 DOI: 10.1093/jxb/ert320] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Affiliation(s)
- Bruno Moulia
- INRA (Institut National de la Recherche Agronomique), UMR0547 PIAF (Unité Mixte de Recherche PIAF Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier), F-63100 Clermont-Ferrand, France
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215
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Utility of information in photographs taken upwards from the floor of closed-canopy deciduous broadleaved and closed-canopy evergreen coniferous forests for continuous observation of canopy phenology. ECOL INFORM 2013. [DOI: 10.1016/j.ecoinf.2013.05.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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216
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Yang J, Zhang G, Ci X, Swenson NG, Cao M, Sha L, Li J, Baskin CC, Slik JF, Lin L. Functional and phylogenetic assembly in a Chinese tropical tree community across size classes, spatial scales and habitats. Funct Ecol 2013. [DOI: 10.1111/1365-2435.12176] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Jie Yang
- Key Laboratory of Tropical Forest Ecology; Xishuangbanna Tropical Botanical Garden; Chinese Academy of Sciences; Kunming 650223 China
- University of Chinese Academy of Sciences; Beijing 100049 China
| | - Guocheng Zhang
- Key Laboratory of Tropical Forest Ecology; Xishuangbanna Tropical Botanical Garden; Chinese Academy of Sciences; Kunming 650223 China
- University of Chinese Academy of Sciences; Beijing 100049 China
| | - Xiuqin Ci
- Key Laboratory of Tropical Forest Ecology; Xishuangbanna Tropical Botanical Garden; Chinese Academy of Sciences; Kunming 650223 China
- University of Chinese Academy of Sciences; Beijing 100049 China
| | - Nathan G. Swenson
- Department of Plant Biology; Michigan State University; East Lansing Michigan 48824 USA
| | - Min Cao
- Key Laboratory of Tropical Forest Ecology; Xishuangbanna Tropical Botanical Garden; Chinese Academy of Sciences; Kunming 650223 China
| | - Liqing Sha
- Key Laboratory of Tropical Forest Ecology; Xishuangbanna Tropical Botanical Garden; Chinese Academy of Sciences; Kunming 650223 China
| | - Jie Li
- Key Laboratory of Tropical Forest Ecology; Xishuangbanna Tropical Botanical Garden; Chinese Academy of Sciences; Kunming 650223 China
| | - Carol C. Baskin
- Department of Biology; University of Kentucky; Lexington Kentucky 40506 USA
- Department of Plant and Soil Sciences; University of Kentucky; Lexington Kentucky 40546 USA
| | - J.W. Ferry Slik
- Key Laboratory of Tropical Forest Ecology; Xishuangbanna Tropical Botanical Garden; Chinese Academy of Sciences; Kunming 650223 China
| | - Luxiang Lin
- Key Laboratory of Tropical Forest Ecology; Xishuangbanna Tropical Botanical Garden; Chinese Academy of Sciences; Kunming 650223 China
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217
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Sack L, Scoffoni C, John GP, Poorter H, Mason CM, Mendez-Alonzo R, Donovan LA. How do leaf veins influence the worldwide leaf economic spectrum? Review and synthesis. JOURNAL OF EXPERIMENTAL BOTANY 2013; 64:4053-80. [PMID: 24123455 DOI: 10.1093/jxb/ert316] [Citation(s) in RCA: 104] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Leaf vein traits are implicated in the determination of gas exchange rates and plant performance. These traits are increasingly considered as causal factors affecting the 'leaf economic spectrum' (LES), which includes the light-saturated rate of photosynthesis, dark respiration, foliar nitrogen concentration, leaf dry mass per area (LMA) and leaf longevity. This article reviews the support for two contrasting hypotheses regarding a key vein trait, vein length per unit leaf area (VLA). Recently, Blonder et al. (2011, 2013) proposed that vein traits, including VLA, can be described as the 'origin' of the LES by structurally determining LMA and leaf thickness, and thereby vein traits would predict LES traits according to specific equations. Careful re-examination of leaf anatomy, published datasets, and a newly compiled global database for diverse species did not support the 'vein origin' hypothesis, and moreover showed that the apparent power of those equations to predict LES traits arose from circularity. This review provides a 'flux trait network' hypothesis for the effects of vein traits on the LES and on plant performance, based on a synthesis of the previous literature. According to this hypothesis, VLA, while virtually independent of LMA, strongly influences hydraulic conductance, and thus stomatal conductance and photosynthetic rate. We also review (i) the specific physiological roles of VLA; (ii) the role of leaf major veins in influencing LES traits; and (iii) the role of VLA in determining photosynthetic rate per leaf dry mass and plant relative growth rate. A clear understanding of leaf vein traits provides a new perspective on plant function independently of the LES and can enhance the ability to explain and predict whole plant performance under dynamic conditions, with applications towards breeding improved crop varieties.
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Affiliation(s)
- Lawren Sack
- Department of Ecology and Evolutionary Biology, University of California Los Angeles, 621 Charles E. Young Drive South, Los Angeles, CA 90095, USA
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218
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Villar R, Ruiz-Robleto J, Ubera JL, Poorter H. Exploring variation in leaf mass per area (LMA) from leaf to cell: an anatomical analysis of 26 woody species. AMERICAN JOURNAL OF BOTANY 2013; 100:1969-80. [PMID: 24107583 DOI: 10.3732/ajb.1200562] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
PREMISE OF THE STUDY Plant species differ widely in the leaf biomass invested per unit area (LMA). LMA can be explained by variation in leaf thickness and/or density, both of which are influenced by anatomical tissue composition. The aim of this study is to quantify the anatomical characteristics that underlie variation in LMA in a range of woody species. • METHODS Twenty-six woody species, forming 13 species pairs with a deciduous and evergreen species from the same genus or family, were grown in a glasshouse. The youngest full-grown leaves were analyzed for LMA and morpho-anatomical characteristics at leaf, tissue, and cell level. • KEY RESULTS Considered over all species studied, leaf thickness and density were equally important to explain the variation in LMA, but the class difference between deciduous and evergreen species was mainly determined by thickness, whereas variation within each group was largely due to density. Evergreens had thicker leaves, predominantly caused by a larger volume of mesophyll and air spaces, whereas the higher leaf density within each group was due to a lower proportion of epidermis and air spaces, and overall smaller cells. • CONCLUSIONS The anatomical basis for variation in LMA in woody species depends on the contrast made. Higher LMA in evergreens is mainly due to a greater leaf thickness, caused by a larger volume of mesophyll and air spaces. Within deciduous species and evergreens, higher LMA is caused by a higher density, due to higher volumetric fractions of mesophyll and lower fractions of air spaces and epidermis.
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Affiliation(s)
- Rafael Villar
- Area de Ecología, Dpto. de Botánica, Ecología y Fisiología Vegetal, Campus de Rabanales, Universidad de Córdoba, 14071 Córdoba, Spain
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219
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Cox PG, Kirkham J, Herrel A. Masticatory biomechanics of the Laotian rock rat, Laonastes aenigmamus, and the function of the zygomaticomandibularis muscle. PeerJ 2013; 1:e160. [PMID: 24058888 PMCID: PMC3775629 DOI: 10.7717/peerj.160] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Accepted: 08/23/2013] [Indexed: 11/20/2022] Open
Abstract
The Laotian rock rat, Laonastes aenigmamus, is one of the most recently discovered species of rodent, and displays a cranial morphology that is highly specialised. The rostrum of L. aenigmamus is exceptionally elongate and bears a large attachment site for the infraorbital portion of the zygomaticomandibularis muscle (IOZM), which is particularly well-developed in this species. In this study, we used finite element analysis to investigate the biomechanical performance of the Laotian rock rat cranium and to elucidate the function of the IOZM. A finite element model of the skull of L. aenigmamus was constructed and solved for biting on each of the teeth (incisors, premolar and molars). Further load cases were created and solved in which the origin of the IOZM had been moved anteriorly and posteriorly along the rostrum. Finally, a set of load cases were produced in which the IOZM was removed entirely, and its force was redistributed between the remaining masticatory muscles. The analysis showed that, during biting, the most stressed areas of the skull were the zygomatic and orbital regions. Compared to other rodents, L. aenigmamus is highly efficient at incisor gnawing, but less efficient at molar chewing. However, a relatively constant bite force across the molar tooth row may be an adaptation to folivory. Movement of the origin of the IOZM had little on the patterns of von Mises stresses, or the overall stress experienced by the cranium. However, removal of the IOZM had a substantial effect on the total deformation experienced by the skull. In addition, the positioning and presence of the IOZM had large impact on bite force. Moving the IOZM origin to the anterior tip of the rostrum led to a substantially reduced bite force at all teeth. This was hypothesised to be a result of the increasing horizontal component to the pull of this muscle as it is moved anteriorly along the rostrum. Removal of the IOZM also resulted in reduced bite force, even when the total input muscle force was maintained at the same level. It was thus concluded that the function of the IOZM in L. aenigmamus is to increase bite force whilst reducing cranial deformation. If the IOZM can be shown to have this function in other rodent groups, this may help explain the evolution of this muscle, and may also provide an understanding of why it has evolved independently several times within rodents.
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Affiliation(s)
- Philip G Cox
- Centre for Anatomical and Human Sciences, Hull York Medical School , University of Hull, Hull , UK
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220
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Kitajima K, Cordero RA, Wright SJ. Leaf life span spectrum of tropical woody seedlings: effects of light and ontogeny and consequences for survival. ANNALS OF BOTANY 2013; 112:685-99. [PMID: 23532047 PMCID: PMC3736767 DOI: 10.1093/aob/mct036] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Accepted: 01/14/2013] [Indexed: 05/10/2023]
Abstract
BACKGROUND AND AIMS Leaf life span is widely recognized as a key life history trait associated with herbivory resistance, but rigorous comparative data are rare for seedlings. The goal of this study was to examine how light environment affects leaf life span, and how ontogenetic development during the first year may influence leaf fracture toughness, lamina density and stem density that are relevant for herbivory resistance, leaf life span and seedling survival. METHODS Data from three experiments encompassing 104 neotropical woody species were combined. Leaf life span, lamina and vein fracture toughness, leaf and stem tissue density and seedling survival were quantified for the first-year seedlings at standardized ontogenetic stages in shade houses and common gardens established in gaps and shaded understorey in a moist tropical forest in Panama. Mortality of naturally recruited seedlings till 1 year later was quantified in 800 1-m² plots from 1994 to 2011. KEY RESULTS Median leaf life span ranged widely among species, always greater in shade (ranging from 151 to >1790 d in the understorey and shade houses) than in gaps (115-867 d), but with strong correlation between gaps and shade. Leaf and stem tissue density increased with seedling age, whereas leaf fracture toughness showed only a weak increase. All these traits were positively correlated with leaf life span. Leaf life span and stem density were negatively correlated with seedling mortality in shade, while gap mortality showed no correlation with these traits. CONCLUSIONS The wide spectrum of leaf life span and associated functional traits reflects variation in shade tolerance of first-year seedlings among coexisting trees, shrubs and lianas in this neotropical forest. High leaf tissue density is important in enhancing leaf toughness, a known physical defence, and leaf life span. Both seedling leaf life span and stem density should be considered as key functional traits that contribute to seedling survival in tropical forest understoreys.
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Affiliation(s)
- Kaoru Kitajima
- Department of Biology, University of Florida, Gainesville, FL 32611, USA.
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221
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Sack L, Scoffoni C. Leaf venation: structure, function, development, evolution, ecology and applications in the past, present and future. THE NEW PHYTOLOGIST 2013; 198:983-1000. [PMID: 23600478 DOI: 10.1111/nph.12253] [Citation(s) in RCA: 323] [Impact Index Per Article: 29.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2012] [Accepted: 02/18/2013] [Indexed: 05/18/2023]
Abstract
The design and function of leaf venation are important to plant performance, with key implications for the distribution and productivity of ecosystems, and applications in paleobiology, agriculture and technology. We synthesize classical concepts and the recent literature on a wide range of aspects of leaf venation. We describe 10 major structural features that contribute to multiple key functions, and scale up to leaf and plant performance. We describe the development and plasticity of leaf venation and its adaptation across environments globally, and a new global data compilation indicating trends relating vein length per unit area to climate, growth form and habitat worldwide. We synthesize the evolution of vein traits in the major plant lineages throughout paleohistory, highlighting the multiple origins of individual traits. We summarize the strikingly diverse current applications of leaf vein research in multiple fields of science and industry. A unified core understanding will enable an increasing range of plant biologists to incorporate leaf venation into their research.
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Affiliation(s)
- Lawren Sack
- Department of Ecology and Evolution, University of California Los Angeles, 621 Charles E. Young Drive South, Los Angeles, CA, 90095, USA
| | - Christine Scoffoni
- Department of Ecology and Evolution, University of California Los Angeles, 621 Charles E. Young Drive South, Los Angeles, CA, 90095, USA
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222
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Iogna PA, Bucci SJ, Scholz FG, Goldstein G. Homeostasis in leaf water potentials on leeward and windward sides of desert shrub crowns: water loss control vs. high hydraulic efficiency. Oecologia 2013; 173:675-87. [DOI: 10.1007/s00442-013-2666-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2012] [Accepted: 04/16/2013] [Indexed: 11/24/2022]
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223
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Richardson SJ, Allen RB, Buxton RP, Easdale TA, Hurst JM, Morse CW, Smissen RD, Peltzer DA. Intraspecific relationships among wood density, leaf structural traits and environment in four co-occurring species of Nothofagus in New Zealand. PLoS One 2013; 8:e58878. [PMID: 23527041 PMCID: PMC3601108 DOI: 10.1371/journal.pone.0058878] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2012] [Accepted: 02/07/2013] [Indexed: 11/18/2022] Open
Abstract
Plant functional traits capture important variation in plant strategy and function. Recent literature has revealed that within-species variation in traits is greater than previously supposed. However, we still have a poor understanding of how intraspecific variation is coordinated among different traits, and how it is driven by environment. We quantified intraspecific variation in wood density and five leaf traits underpinning the leaf economics spectrum (leaf dry matter content, leaf mass per unit area, size, thickness and density) within and among four widespread Nothofagus tree species in southern New Zealand. We tested whether intraspecific relationships between wood density and leaf traits followed widely reported interspecific relationships, and whether variation in these traits was coordinated through shared responses to environmental factors. Sample sites varied widely in environmental variables, including soil fertility (25–900 mg kg–1 total P), precipitation (668–4875 mm yr–1), temperature (5.2–12.4 °C mean annual temperature) and latitude (41–46 °S). Leaf traits were strongly correlated with one another within species, but not with wood density. There was some evidence for a positive relationship between wood density and leaf tissue density and dry matter content, but no evidence that leaf mass or leaf size were correlated with wood density; this highlights that leaf mass per unit area cannot be used as a surrogate for component leaf traits such as tissue density. Trait variation was predicted by environmental factors, but not consistently among different traits; e.g., only leaf thickness and leaf density responded to the same environmental cues as wood density. We conclude that although intraspecific variation in wood density and leaf traits is strongly driven by environmental factors, these responses are not strongly coordinated among functional traits even across co-occurring, closely-related plant species.
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224
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Dehedin A, Maazouzi C, Puijalon S, Marmonier P, Piscart C. The combined effects of water level reduction and an increase in ammonia concentration on organic matter processing by key freshwater shredders in alluvial wetlands. GLOBAL CHANGE BIOLOGY 2013; 19:763-774. [PMID: 23504834 DOI: 10.1111/gcb.12084] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2012] [Revised: 10/25/2012] [Accepted: 10/30/2012] [Indexed: 06/01/2023]
Abstract
In a global change context, the intensity and the frequency of drastic low flow periods or drought events will most likely increase to a substantial extent over the coming decades, leading to a modification in the abiotic characteristics of wetlands. This change in environmental parameters may induce severe shifts in plant and animal communities and the functioning of ecosystems. In this study, we experimentally estimated the effect of drought and the accumulation of ammonia (NH3 ) on the feeding activities of three generalist macroinvertebrates (i.e. Gammarus pulex, Gammarus roeselii and Asellus aquaticus) on three types of organic matter: leaves of Berula erecta growing in submerged conditions, leaves of the same species growing in emerged conditions and dead leaves of Alnus glutinosa. We observed a modification in the biomechanical and stoichiometric characteristics of the plants as a result of the emersion of the aquatic plants. This shift produced a substantial decrease in organic matter recycling by invertebrates and in their associated physiological ability (i.e. the energy stores of the animals) to face conditions associated with environmental change. Moreover, the accumulation of NH3 amplified the negative effect of emersion. This snowball effect on invertebrates may profoundly modify the functioning of ecosystems, particularly in terms of organic matter production/degradation and carbon mineralization.
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Affiliation(s)
- Arnaud Dehedin
- UMR5023 Ecologie des Hydrosystèmes Naturels et Anthropisés, Université de Lyon, Université Lyon 1, ENTPE; CNRS, 6 rue Raphaël Dubois, Villeurbanne, 69622, France
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225
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Méndez‐Alonzo R, Ewers FW, Sack L. Ecological variation in leaf biomechanics and its scaling with tissue structure across three mediterranean‐climate plant communities. Funct Ecol 2013. [DOI: 10.1111/1365-2435.12059] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Rodrigo Méndez‐Alonzo
- Department of Ecology and Evolutionary Biology University of California Los Angeles California USA
| | - Frank W. Ewers
- Biological Sciences Department California State Polytechnic University Pomona Pomona California USA
| | - Lawren Sack
- Department of Ecology and Evolutionary Biology University of California Los Angeles California USA
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226
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Ishii H, Azuma W, Nabeshima E. The need for a canopy perspective to understand the importance of phenotypic plasticity for promoting species coexistence and light-use complementarity in forest ecosystems. Ecol Res 2013. [DOI: 10.1007/s11284-012-1025-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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227
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Ecological and functional correlates of molar shape variation in European populations of Arvicola (Arvicolinae, Rodentia). ZOOL ANZ 2012. [DOI: 10.1016/j.jcz.2011.12.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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228
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Onoda Y, Richards L, Westoby M. The importance of leaf cuticle for carbon economy and mechanical strength. THE NEW PHYTOLOGIST 2012; 196:441-447. [PMID: 22913608 DOI: 10.1111/j.1469-8137.2012.04263.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Accepted: 07/05/2012] [Indexed: 05/22/2023]
Abstract
Cuticle thickness of leaves varies > 100 times across species, yet its dry mass cost and ecological benefits are poorly understood. It has been repeatedly demonstrated that thicker cuticle is not superior as a water barrier, implying that other functions must be important. Here, we measured the mechanical properties, dry mass and density of isolated cuticle from 13 evergreen woody species of Australian forests. Summed adaxial and abaxial cuticle membrane mass per unit leaf area (CMA) varied from 2.95 to 27.4 g m(-2) across species, and accounted for 6.7-24% of lamina dry mass. Density of cuticle varied only from 1.04 to 1.24 g cm(-3) ; thus variation in CMA was mostly due to variation in cuticle thickness. Thicker cuticle was more resistant to tearing. Tensile strength and modulus of elasticity of cuticle were much higher than those of leaf laminas, with significant differences between adaxial and abaxial cuticles. While cuticle membranes were thin, they could account for a significant fraction of leaf dry mass due to their high density. The substantial cost of thicker cuticle is probably offset by increased mechanical resistance which might confer longer leaf lifespans among evergreen species.
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Affiliation(s)
- Yusuke Onoda
- Department of Biological Sciences, Macquarie University, Sydney, NSW, 2109, Australia
- Division of Environmental Science and Technology, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan
| | - Lora Richards
- Department of Biological Sciences, Macquarie University, Sydney, NSW, 2109, Australia
- Biology Department, University of Nevada Reno, Reno, NV, 89557, USA
| | - Mark Westoby
- Department of Biological Sciences, Macquarie University, Sydney, NSW, 2109, Australia
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229
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Onoda Y, Lusk C. Like a jungle sometimes: how leaves survive in the rainforest understory. THE NEW PHYTOLOGIST 2012; 195:507-509. [PMID: 22775321 DOI: 10.1111/j.1469-8137.2012.04231.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Affiliation(s)
- Yusuke Onoda
- Division of Environmental Science and Technology, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan
- (Author for correspondence: tel +81 75 753 6079; email )
| | - Chris Lusk
- Department of Biological Sciences, The University of Waikato, Private Bag 3105, Hamilton, New Zealand
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230
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Herrel A, Fabre AC, Hugot JP, Keovichit K, Adriaens D, Brabant L, Van Hoorebeke L, Cornette R. Ontogeny of the cranial system in Laonastes aenigmamus. J Anat 2012; 221:128-37. [PMID: 22607030 PMCID: PMC3406360 DOI: 10.1111/j.1469-7580.2012.01519.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/25/2012] [Indexed: 10/28/2022] Open
Abstract
Rodents, together with bats, are among the ecologically most diverse and most speciose groups of mammals. Moreover, rodents show elaborate specializations of the feeding apparatus in response to the predominantly fore-aft movements of the lower jaw. The Laotian rock rat Laonastes aenigmamus was recently discovered and originally thought to belong to a new family. The difficulties in classifying L. aenigmamus based on morphological characters stem from the fact that it presents a mixture of sciurognathous and hystricognathous characteristics, including the morphology of the jaw adductors. The origin of the unusual muscular organization in this species remains, however, unclear. Here, we investigate the development of the masticatory system in Laonastes to better understand the origin of its derived morphology relative to other rodents. Our analyses show that skull and mandible development is characterized by an overall elongation of the snout region. Muscle mass increases with positive allometry during development and growth, and so does the force-generating capacity of the jaw adductor muscles (i.e. physiological cross-sectional area). Whereas fetal crania and musculature are more similar to those of typical rodents, adults diverge in the elongation of the rostral part of the skull and the disproportionate development of the zygomaticomandibularis. Our data suggest a functional signal in the development of the unusual cranial morphology, possibly associated with the folivorous trophic ecology of the species.
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Affiliation(s)
- Anthony Herrel
- UMR CNRS/MNHN 7179, Mécanismes adaptatifs: des organismes aux communautés, Paris, France.
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231
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Kitajima K, Llorens AM, Stefanescu C, Timchenko MV, Lucas PW, Wright SJ. How cellulose-based leaf toughness and lamina density contribute to long leaf lifespans of shade-tolerant species. THE NEW PHYTOLOGIST 2012; 195:640-652. [PMID: 22709147 DOI: 10.1111/j.1469-8137.2012.04203.x] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Cell wall fibre and lamina density may interactively affect leaf toughness and leaf lifespan. Here, we tested this with seedlings of 24 neotropical tree species differing in shade tolerance and leaf lifespan under standardized field conditions (140-867 d in gaps; longer in shade). We quantified toughness with a cutting test, explicitly seeking a mechanistic linkage to fibre. Lamina density, but not fracture toughness, exhibited a plastic response to gaps vs shade, while neither trait was affected by leaf age. Toughness corrected for lamina density, a recently recognized indicator of material strength per unit mass, was linearly correlated with cellulose content per unit dry mass. Leaf lifespan was positively correlated with cellulose and toughness in shade-tolerant species but only weakly in gap-dependent species. Leaf lifespan was uncorrelated with lamina thickness, phenolics and tannin concentrations. In path analysis including all species, leaf lifespan was directly enhanced by density and toughness, and indirectly by cellulose via its effect on toughness. Different suites of leaf traits were correlated with early seedling survival in gaps vs shade. In conclusion, cellulose and lamina density jointly enhance leaf fracture toughness, and these carbon-based physical traits, rather than phenolic-based defence, explain species differences in herbivory, leaf lifespan and shade survival.
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Affiliation(s)
- Kaoru Kitajima
- Department of Biology, University of Florida, Gainesville, FL 32611, USA
- Smithsonian Tropical Research Institute, Balboa, Panama
| | | | - Carla Stefanescu
- Department of Biology, University of Florida, Gainesville, FL 32611, USA
| | | | - Peter W Lucas
- Department of Bioclinical Sciences, Kuwait University, Kuwait
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232
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Palow DT, Nolting K, Kitajima K. Functional trait divergence of juveniles and adults of nineIngaspecies with contrasting soil preference in a tropical rain forest. Funct Ecol 2012. [DOI: 10.1111/j.1365-2435.2012.02019.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Danielle T. Palow
- Department of Biology; University of Florida; Gainesville; FL; 32611; USA
| | - Kristen Nolting
- Department of Plant Biology; Michigan State University; East Lansing; MI; 48824; USA
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233
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Nabity PD, Orpet R, Miresmailli S, Berenbaum MR, DeLucia EH. Silica and nitrogen modulate physical defense against chewing insect herbivores in bioenergy crops Miscanthus x Giganteus and Panicum virgatum (Poaceae). JOURNAL OF ECONOMIC ENTOMOLOGY 2012; 105:878-83. [PMID: 22812125 DOI: 10.1603/ec11424] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Feedstock crops selected for bioenergy production to date are almost exclusively perennial grasses because of favorable physiological traits that enhance growth, water use, and nutrient assimilation efficiency. Grasses, however, tend to rely primarily on physical defenses, such as silica, to deter herbivores. Silica impedes processing of feedstocks and introduces a trade-off between managing for cost efficiency (i.e., yield) and plant defenses. To test how silica modulates herbivory in two of the most preferred feedstock crops for production across the central United States, miscanthus (Miscanthus x giganteus Greef and Deuter ex Hodkinson and Renvoize) and switchgrass (Panicum virgatum L.), we examined the performance of two immature generalist insect herbivores, fall armyworm (Spodoptera frugiperda (J.E. Smith) and the American grasshopper [Schistocerca americana (Drury)], on grasses grown under silica and nitrogen amendment. Both miscanthus and switchgrass assimilated nitrogen and silica when grown in amended soil that altered the consumption and conversion efficiency of herbivores consuming leaf tissue. The magnitude of nutrient assimilation, however, depended on intrinsic plant traits. Nitrogen increased conversion efficiency for both fall armyworm and American grasshopper but increased consumption rate only for fall armyworm. Silica reduced conversion efficiency and increased consumption rate only for the American grasshopper. Because of this variability, management strategies that reduce silica or increase nitrogen content in feedstock crops to enhance yields may directly influence the ability of bioenergy grasses to deter certain generalist herbivores.
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Affiliation(s)
- P D Nabity
- Department of Plant Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
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234
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Pincebourde S, Woods HA. Climate uncertainty on leaf surfaces: the biophysics of leaf microclimates and their consequences for leaf-dwelling organisms. Funct Ecol 2012. [DOI: 10.1111/j.1365-2435.2012.02013.x] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sylvain Pincebourde
- Institut de Recherche sur la Biologie de l'Insecte (IRBI, CNRS UMR 7261); Université François Rabelais; 37200; Tours; France
| | - H. Arthur Woods
- Division of Biological Sciences; University of Montana; Missoula; MT; 59812; USA
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235
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Liu L, Puolamäki K, Eronen JT, Ataabadi MM, Hernesniemi E, Fortelius M. Dental functional traits of mammals resolve productivity in terrestrial ecosystems past and present. Proc Biol Sci 2012; 279:2793-9. [PMID: 22456884 DOI: 10.1098/rspb.2012.0211] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
We have recently shown that rainfall, one of the main climatic determinants of terrestrial net primary productivity (NPP), can be robustly estimated from mean molar tooth crown height (hypsodonty) of mammalian herbivores. Here, we show that another functional trait of herbivore molar surfaces, longitudinal loph count, can be similarly used to extract reasonable estimates of rainfall but also of temperature, the other main climatic determinant of terrestrial NPP. Together, molar height and the number of longitudinal lophs explain 73 per cent of the global variation in terrestrial NPP today and resolve the main terrestrial biomes in bivariate space. We explain the functional interpretation of the relationships between dental function and climate variables in terms of long- and short-term demands. We also show how the spatially and temporally dense fossil record of terrestrial mammals can be used to investigate the relationship between biodiversity and productivity under changing climates in geological time. The placement of the fossil chronofaunas in biome space suggests that they most probably represent multiple palaeobiomes, at least some of which do not correspond directly to any biomes of today's world.
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Affiliation(s)
- Liping Liu
- Department of Geosciences and Geography, University of Helsinki, Helsinki, Finland.
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236
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Clissold FJ, Brown ZP, Simpson SJ. Protein-induced weight increase of the gastrointestinal tract of locusts improves net nutrient uptake via larger meals rather than more efficient nutrient absorption. J Exp Biol 2012; 216:329-37. [DOI: 10.1242/jeb.076489] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Summary
Increasing the tissue biomass and/or volume of the gastrointestinal tract (GIT) is commonly seen when animals feed on poor quality diets. This increase can simply permit larger meal sizes, but may also rebalance nutritionally imbalanced ingesta by allowing selective absorption of limiting nutrients. In an insect herbivore, the migratory locust, a synthetic diet with a high ratio of protein to carbohydrate was found to induce weight enhancement of the GIT. When normalized for sex and overall body size, increases to the mass of the foregut and midgut caeca resulted in higher absorption (20-30%) of both protein and carbohydrate when subsequently feeding on three chemically and structurally different grasses. Greater net absorption of macronutrients occurred because these locusts ate larger meals that transited at the same time and with the same digestive efficiency as locusts in which the GIT was not enlarged. Thus, plasticity of the GIT did not improve nutritional homeostasis, but increased the rate of nutrient uptake.
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Affiliation(s)
| | - Zuben P Brown
- The University of Sydney, Australia; Osaka University, Japan
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237
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238
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Houter NC, Pons TL. Ontogenetic changes in leaf traits of tropical rainforest trees differing in juvenile light requirement. Oecologia 2011; 169:33-45. [PMID: 22038060 PMCID: PMC3338326 DOI: 10.1007/s00442-011-2175-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2011] [Accepted: 10/11/2011] [Indexed: 11/26/2022]
Abstract
Relationships between leaf traits and the gap dependence for regeneration, and ontogenetic changes therein, were investigated in juvenile and adult tropical rainforest tree species. The juveniles of the 17 species included in the study were grown in high light, similar to the exposed crowns of the adult trees. The traits were structural, biomechanical, chemical and photosynthetic. With increasing species gap dependence, leaf mass per area (LMA) decreased only slightly in juveniles and remained constant in adults, whereas punch strength together with tissue density decreased, and photosynthetic capacity and chlorophyll increased. Contrary to what has been mostly found in evergreen tropical rainforest, the trade-off between investment in longevity and in productivity was evident at an essentially constant LMA. Of the traits pertaining to the chloroplast level, photosynthetic capacity per unit chlorophyll increased with gap dependence, but the chlorophyll a/b ratio showed no relationship. Adults had a twofold higher LMA, but leaf strength was on average only about 50% larger. Leaf tissue density, and chlorophyll and leaf N per area were also higher, whereas chlorophyll and leaf N per unit dry mass were lower. Ranking of the species, relationships between traits and with the gap dependence of the species were similar for juveniles and adults. However, the magnitudes of most ontogenetic changes were not clearly related to a species’ gap dependence. The adaptive value of the leaf traits for juveniles and adults is discussed.
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Affiliation(s)
- Nico C. Houter
- Department Plant Ecophysiology, Institute of Environmental Biology, Utrecht University, Padualaan 8, 3508 CH Utrecht, The Netherlands
| | - Thijs L. Pons
- Department Plant Ecophysiology, Institute of Environmental Biology, Utrecht University, Padualaan 8, 3508 CH Utrecht, The Netherlands
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KATTGE J, DÍAZ S, LAVOREL S, PRENTICE IC, LEADLEY P, BÖNISCH G, GARNIER E, WESTOBY M, REICH PB, WRIGHT IJ, CORNELISSEN JHC, VIOLLE C, HARRISON SP, Van BODEGOM PM, REICHSTEIN M, ENQUIST BJ, SOUDZILOVSKAIA NA, ACKERLY DD, ANAND M, ATKIN O, BAHN M, BAKER TR, BALDOCCHI D, BEKKER R, BLANCO CC, BLONDER B, BOND WJ, BRADSTOCK R, BUNKER DE, CASANOVES F, CAVENDER-BARES J, CHAMBERS JQ, CHAPIN III FS, CHAVE J, COOMES D, CORNWELL WK, CRAINE JM, DOBRIN BH, DUARTE L, DURKA W, ELSER J, ESSER G, ESTIARTE M, FAGAN WF, FANG J, FERNÁNDEZ-MÉNDEZ F, FIDELIS A, FINEGAN B, FLORES O, FORD H, FRANK D, FRESCHET GT, FYLLAS NM, GALLAGHER RV, GREEN WA, GUTIERREZ AG, HICKLER T, HIGGINS SI, HODGSON JG, JALILI A, JANSEN S, JOLY CA, KERKHOFF AJ, KIRKUP D, KITAJIMA K, KLEYER M, KLOTZ S, KNOPS JMH, KRAMER K, KÜHN I, KUROKAWA H, LAUGHLIN D, LEE TD, LEISHMAN M, LENS F, LENZ T, LEWIS SL, LLOYD J, LLUSIÀ J, LOUAULT F, MA S, MAHECHA MD, MANNING P, MASSAD T, MEDLYN BE, MESSIER J, MOLES AT, MÜLLER SC, NADROWSKI K, NAEEM S, NIINEMETS Ü, NÖLLERT S, NÜSKE A, OGAYA R, OLEKSYN J, ONIPCHENKO VG, ONODA Y, ORDOÑEZ J, OVERBECK G, OZINGA WA, PATIÑO S, PAULA S, PAUSAS JG, PEÑUELAS J, PHILLIPS OL, PILLAR V, POORTER H, POORTER L, POSCHLOD P, PRINZING A, PROULX R, RAMMIG A, REINSCH S, REU B, SACK L, SALGADO-NEGRET B, SARDANS J, SHIODERA S, SHIPLEY B, SIEFERT A, SOSINSKI E, SOUSSANA JF, SWAINE E, SWENSON N, THOMPSON K, THORNTON P, WALDRAM M, WEIHER E, WHITE M, WHITE S, WRIGHT SJ, YGUEL B, ZAEHLE S, ZANNE AE, WIRTH C. TRY - a global database of plant traits. GLOBAL CHANGE BIOLOGY 2011; 17:2905-2935. [PMCID: PMC3627314 DOI: 10.1111/j.1365-2486.2011.02451.x] [Citation(s) in RCA: 985] [Impact Index Per Article: 75.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
|
241
|
Boyero L, Pearson RG, Dudgeon D, Graça MAS, Gessner MO, Albariño RJ, Ferreira V, Yule CM, Boulton AJ, Arunachalam M, Callisto M, Chauvet E, Ramírez A, Chará J, Moretti MS, Gonçalves JF, Helson JE, Chará-Serna AM, Encalada AC, Davies JN, Lamothe S, Cornejo A, Li AOY, Buria LM, Villanueva VD, Zúñiga MC, Pringle CM. Global distribution of a key trophic guild contrasts with common latitudinal diversity patterns. Ecology 2011; 92:1839-48. [DOI: 10.1890/10-2244.1] [Citation(s) in RCA: 143] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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