Grazing - induced morphological and growth rate changes in Anarthrophyllum rigidum, a Patagonian leguminous shrub
Grazing influences the morphology and growth rate of shrubs, and consequently, their population dynamics. It has been shown that grazing directly affects the growth of shrubs. On the other hand, the reduction of grass biomass by herbivores reduces soil-water competition between grasses and shrubs, a...
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| Formato: | Artículo |
| Lenguaje: | Inglés |
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| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2013srur.pdf LINK AL EDITOR |
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| 024 | |a 10.1016/j.dendro.2013.02.002 | ||
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| 245 | 1 | 0 | |a Grazing - induced morphological and growth rate changes in Anarthrophyllum rigidum, a Patagonian leguminous shrub |
| 520 | |a Grazing influences the morphology and growth rate of shrubs, and consequently, their population dynamics. It has been shown that grazing directly affects the growth of shrubs. On the other hand, the reduction of grass biomass by herbivores reduces soil-water competition between grasses and shrubs, and indirectly, could enhance the growth of shrubs. However, the assessment of the long-term effects of grazing on the growth of shrubs in the arid Patagonia has been hampered by the lack of long and homogeneous records of plant population dynamics and primary production. In this study, we combined growth-ring and allometric analyses to assess the long-term effect of grazing on individuals of Anarthrophyllum rigidum, a leguminous shrub widely distributed across the Patagonian steppe. A. rigidum has evergreen leaves rich in proteins that constitute an important complement to the diet of sheep, particularly in winter when the abundance of grasses is reduced. Our observations indicate that individuals of A. rigidum nearby the water source used by livestock were smaller in size [35.5cm vs. 67.39cm], presented a larger number of basal branches [23 vs. 12], and showed slower rates of growth [8.2mmyear-1 vs. 14.3mmyear-1] than individuals located far from the water source. This first quantification of the long-term effects of grazing on A. rigidum in the dry Patagonian steppe suggests that beneficial effects of grazing through the reduction of grasses that compete with shrubs for soil-water should be more obvious for livestock non-preferred than preferred shrubs. | ||
| 653 | 0 | |a ALLOMETRIC TRAITS | |
| 653 | 0 | |a GROWTH-RING ANALYSIS | |
| 653 | 0 | |a HERBIVORE PREFERENCE | |
| 653 | 0 | |a PIOSPHERE | |
| 653 | 0 | |a ALLOMETRY | |
| 653 | 0 | |a BIOMASS | |
| 653 | 0 | |a GRASS | |
| 653 | 0 | |a GRAZING | |
| 653 | 0 | |a GROWTH RATE | |
| 653 | 0 | |a HERBIVORE | |
| 653 | 0 | |a LEGUME | |
| 653 | 0 | |a MORPHOLOGY | |
| 653 | 0 | |a PLANT-HERBIVORE INTERACTION | |
| 653 | 0 | |a POPULATION DYNAMICS | |
| 653 | 0 | |a PRIMARY PRODUCTION | |
| 653 | 0 | |a SHRUB | |
| 653 | 0 | |a SOIL WATER | |
| 653 | 0 | |a PATAGONIA | |
| 653 | 0 | |a ANARTHROPHYLLUM | |
| 653 | 0 | |a OVIS ARIES | |
| 653 | 0 | |a POACEAE | |
| 700 | 1 | |a Srur, Ana Marina |9 30805 | |
| 700 | 1 | |a Golluscio, Rodolfo Angel |9 729 | |
| 700 | 1 | |a Villalba, Ricardo |9 41074 | |
| 700 | 1 | |9 40785 |a Hodara, Karina | |
| 773 | |t Dendrochronologia |g vol.31, no.3 (2013), p.223-227 | ||
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| 900 | |a ^tGrazing-induced morphological and growth rate changes in Anarthrophyllum rigidum, a Patagonian leguminous shrub | ||
| 900 | |a ^aSrur^bA.M. | ||
| 900 | |a ^aGolluscio^bR.A. | ||
| 900 | |a ^aVillalba^bR. | ||
| 900 | |a ^aHodara^bK. | ||
| 900 | |a ^aSrur^bA. M. | ||
| 900 | |a ^aGolluscio^bR. A. | ||
| 900 | |a ^aVillalba^bR. | ||
| 900 | |a ^aHodara^bK. | ||
| 900 | |a ^aSrur, A.M.^tInstituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA-CCT-CONICET), C.C. 330, 5500 Mendoza, Argentina | ||
| 900 | |a ^aGolluscio, R.A.^tDepartamento de Producción Animal, Facultad de Agronomía and IFEVA (UBA/CONICET), Av. San Martín 4453, C1417DSE Buenos Aires, Argentina | ||
| 900 | |a ^aVillalba, R.^tInstituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA-CCT-CONICET), C.C.330, 5500 Mendoza, Argentina | ||
| 900 | |a ^aHodara, K.^tDepartamento de Métodos Cuantitativos y Sistemas de Información, Facultad de Agronomía, Av. San Martín 4453, C1417DSE Buenos Aires, Argentina | ||
| 900 | |a ^tDendrochronologia^cDendrochronologia | ||
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| 900 | |a Vol. 31, no. 3 | ||
| 900 | |a 227 | ||
| 900 | |a ALLOMETRIC TRAITS | ||
| 900 | |a GROWTH-RING ANALYSIS | ||
| 900 | |a HERBIVORE PREFERENCE | ||
| 900 | |a PIOSPHERE | ||
| 900 | |a ALLOMETRY | ||
| 900 | |a BIOMASS | ||
| 900 | |a GRASS | ||
| 900 | |a GRAZING | ||
| 900 | |a GROWTH RATE | ||
| 900 | |a HERBIVORE | ||
| 900 | |a LEGUME | ||
| 900 | |a MORPHOLOGY | ||
| 900 | |a PLANT-HERBIVORE INTERACTION | ||
| 900 | |a POPULATION DYNAMICS | ||
| 900 | |a PRIMARY PRODUCTION | ||
| 900 | |a SHRUB | ||
| 900 | |a SOIL WATER | ||
| 900 | |a PATAGONIA | ||
| 900 | |a ANARTHROPHYLLUM | ||
| 900 | |a OVIS ARIES | ||
| 900 | |a POACEAE | ||
| 900 | |a Grazing influences the morphology and growth rate of shrubs, and consequently, their population dynamics. It has been shown that grazing directly affects the growth of shrubs. On the other hand, the reduction of grass biomass by herbivores reduces soil-water competition between grasses and shrubs, and indirectly, could enhance the growth of shrubs. However, the assessment of the long-term effects of grazing on the growth of shrubs in the arid Patagonia has been hampered by the lack of long and homogeneous records of plant population dynamics and primary production. In this study, we combined growth-ring and allometric analyses to assess the long-term effect of grazing on individuals of Anarthrophyllum rigidum, a leguminous shrub widely distributed across the Patagonian steppe. A. rigidum has evergreen leaves rich in proteins that constitute an important complement to the diet of sheep, particularly in winter when the abundance of grasses is reduced. Our observations indicate that individuals of A. rigidum nearby the water source used by livestock were smaller in size [35.5cm vs. 67.39cm], presented a larger number of basal branches [23 vs. 12], and showed slower rates of growth [8.2mmyear-1 vs. 14.3mmyear-1] than individuals located far from the water source. This first quantification of the long-term effects of grazing on A. rigidum in the dry Patagonian steppe suggests that beneficial effects of grazing through the reduction of grasses that compete with shrubs for soil-water should be more obvious for livestock non-preferred than preferred shrubs. | ||
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