Aridity and grazing as convergent selective forces an experiment with an Arid Chaco bunchgrass
It has been proposed that aridity and grazing are convergent selective forces: each one selects for traits conferring resistance to both. However, this conceptual model has not yet been experimentally validated. The aim of this work was to experimentally evaluate the effect of aridity and grazing, a...
| Otros Autores: | , , , |
|---|---|
| Formato: | Artículo |
| Lenguaje: | Inglés |
| Materias: | |
| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2010Quiroga.pdf LINK AL EDITOR |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
| LEADER | 09555cab a22018617a 4500 | ||
|---|---|---|---|
| 001 | AR-BaUFA000073 | ||
| 003 | AR-BaUFA | ||
| 005 | 20230816100025.0 | ||
| 008 | 181208t2010 |||||o|||||00||||eng d | ||
| 999 | |c 46507 |d 46507 | ||
| 022 | |a 1051-0761 | ||
| 024 | |a 10.1890/09-0641.1 | ||
| 040 | |a AR-BaUFA |c AR-BaUFA | ||
| 245 | 1 | 0 | |a Aridity and grazing as convergent selective forces |b an experiment with an Arid Chaco bunchgrass |
| 520 | |a It has been proposed that aridity and grazing are convergent selective forces: each one selects for traits conferring resistance to both. However, this conceptual model has not yet been experimentally validated. The aim of this work was to experimentally evaluate the effect of aridity and grazing, as selective forces, on drought and grazing resistance of populations of Trichloris crinita, a native perennial forage grass of the Argentinean Arid Chaco region. We collected seeds in sites with four different combinations of aridity and grazing history [semiarid/subhumid X heavily grazed/lightly grazed], established them in pots in a common garden, and subjected the resulting plants to different combinations of drought and defoliation. Our results agreed with the convergence model. Aridity has selected T. crinita genotypes that respond better to drought and defoliation in terms of sexual reproduction and leaf growth, and that can evade grazing due to a lower shoot : root ratio and a higher resource allocation to reserves [starch] in stem bases. Similarly, grazing has selected genotypes that respond better to drought and defoliation in terms of sexual reproduction and that can evade grazing due to a lower digestibility of leaf blades. These results allow us to extend concepts of previous models in plant adaptation to herbivory to models on plant adaptation to drought. The only variable in which we obtained a result opposite to predictions was plant height, as plants from semiarid sites were taller [and with more erect tillers] than plants from subhumid sites; we hypothesize that this result might have been a consequence of the selection exerted by the high solar radiation and soil temperatures of semiarid sites. In addition, our work allows for the prediction of the effects of dry or wet growing seasons on the performance of T. crinita plants. Our results suggest that we can rely on dry environments for selecting grazing-resistant genotypes and on high grazing pressure history environments for selecting drought-resistant ones. | ||
| 653 | 0 | |a ARGENTINEAN ARID CHACO REGION | |
| 653 | 0 | |a AVOIDANCE | |
| 653 | 0 | |a COMMON GARDEN | |
| 653 | 0 | |a CONVERGENCE | |
| 653 | 0 | |a DEFOLIATION | |
| 653 | 0 | |a DROUGHT | |
| 653 | 0 | |a EVOLUTION | |
| 653 | 0 | |a NATURAL SELECTION | |
| 653 | 0 | |a RESISTANCE | |
| 653 | 0 | |a TOLERANCE | |
| 653 | 0 | |a TRICHLORIS CRINITA | |
| 653 | 0 | |a WATER | |
| 653 | 0 | |a ADAPTATION | |
| 653 | 0 | |a ARID REGION | |
| 653 | 0 | |a ARIDITY | |
| 653 | 0 | |a DIGESTIBILITY | |
| 653 | 0 | |a DROUGHT RESISTANCE | |
| 653 | 0 | |a FORAGE | |
| 653 | 0 | |a GENOTYPE | |
| 653 | 0 | |a GRASS | |
| 653 | 0 | |a GRAZING | |
| 653 | 0 | |a GROWING SEASON | |
| 653 | 0 | |a HERBIVORY | |
| 653 | 0 | |a NATIVE SPECIES | |
| 653 | 0 | |a NATURAL SELECTION | |
| 653 | 0 | |a RESOURCE ALLOCATION | |
| 653 | 0 | |a SEED | |
| 653 | 0 | |a SEMIARID REGION | |
| 653 | 0 | |a SEXUAL REPRODUCTION | |
| 653 | 0 | |a SOIL TEMPERATURE | |
| 653 | 0 | |a SOLAR RADIATION | |
| 653 | 0 | |a ANIMAL | |
| 653 | 0 | |a CATTLE | |
| 653 | 0 | |a DROUGHT | |
| 653 | 0 | |a FEEDING BEHAVIOR | |
| 653 | 0 | |a GENETIC SELECTION | |
| 653 | 0 | |a PHYSIOLOGY | |
| 653 | 0 | |a POACEAE | |
| 653 | 0 | |a ANIMALS | |
| 653 | 0 | |a DROUGHTS | |
| 653 | 0 | |a SELECTION, GENETIC | |
| 653 | 0 | |a ATER | |
| 653 | 0 | |a ARGENTINA | |
| 653 | 0 | |a CHACO [ARGENTINA] | |
| 653 | 0 | |a TRICHLORIS CRINITA | |
| 700 | 1 | |9 30497 |a Quiroga, Raúl Emiliano | |
| 700 | 1 | |9 729 |a Golluscio, Rodolfo Angel | |
| 700 | 1 | |9 14327 |a Blanco, Lisandro Javier | |
| 700 | 1 | |9 6385 |a Fernández, Roberto Javier | |
| 773 | |t Ecological Applications |g Vol.20, no.7 (2010), p.1876-1889 | ||
| 856 | |u http://ri.agro.uba.ar/files/intranet/articulo/2010Quiroga.pdf |i En reservorio |q application/pdf |f 2010Quiroga |x MIGRADOS2018 | ||
| 856 | |u http://www.esapubs.org/ |x MIGRADOS2018 |z LINK AL EDITOR | ||
| 900 | |a as | ||
| 900 | |a 20131220 | ||
| 900 | |a N | ||
| 900 | |a SCOPUS | ||
| 900 | |a a | ||
| 900 | |a s | ||
| 900 | |a ARTICULO | ||
| 900 | |a EN LINEA | ||
| 900 | |a 10510761 | ||
| 900 | |a 10.1890/09-0641.1 | ||
| 900 | |a ^tAridity and grazing as convergent selective forces^san experiment with an Arid Chaco bunchgrass | ||
| 900 | |a ^aQuiroga^bR.E. | ||
| 900 | |a ^aGolluscio^bR.A. | ||
| 900 | |a ^aBlanco^bL.J. | ||
| 900 | |a ^aFernández^bR.J. | ||
| 900 | |a ^aQuiroga^bR. E. | ||
| 900 | |a ^aGolluscio^bR. A. | ||
| 900 | |a ^aBlanco^bL. J. | ||
| 900 | |a ^aFernández^bR. J. | ||
| 900 | |a ^aQuiroga, R.E.^tEstación Experimental Agropecuaria la Rioja, Instituto Nacional de Tecnología Agropecuaria [INTA], CC26, Chamical, La Rioja 5380, Argentina | ||
| 900 | |a ^aGolluscio, R.A.^tIFEVA, CONICET-Cátedra de Forrajicultura, Universidad de Buenos Aires, Avenida San Martín 4453, Buenos Aires 1417, Argentina | ||
| 900 | |a ^aBlanco, L.J.^tIFEVA, CONICET-Cátedra de Ecología, Universidad de Buenos Aires, Avenida San Martín 4453, Buenos Aires 1417, Argentina | ||
| 900 | |a ^aFernández, R.J.^tEEA Catamarca, INTA, Ruta Provincial No. 33, Km 4, Sumalao, Valle Viejo, Catamarca 4705, Argentina | ||
| 900 | |a ^tEcological Applications^cEcol. Appl. | ||
| 900 | |a en | ||
| 900 | |a 1876 | ||
| 900 | |a ^i | ||
| 900 | |a Vol. 20, no. 7 | ||
| 900 | |a 1889 | ||
| 900 | |a ARGENTINEAN ARID CHACO REGION | ||
| 900 | |a AVOIDANCE | ||
| 900 | |a COMMON GARDEN | ||
| 900 | |a CONVERGENCE | ||
| 900 | |a DEFOLIATION | ||
| 900 | |a DROUGHT | ||
| 900 | |a EVOLUTION | ||
| 900 | |a NATURAL SELECTION | ||
| 900 | |a RESISTANCE | ||
| 900 | |a TOLERANCE | ||
| 900 | |a TRICHLORIS CRINITA | ||
| 900 | |a WATER | ||
| 900 | |a ADAPTATION | ||
| 900 | |a ARID REGION | ||
| 900 | |a ARIDITY | ||
| 900 | |a DIGESTIBILITY | ||
| 900 | |a DROUGHT RESISTANCE | ||
| 900 | |a FORAGE | ||
| 900 | |a GENOTYPE | ||
| 900 | |a GRASS | ||
| 900 | |a GRAZING | ||
| 900 | |a GROWING SEASON | ||
| 900 | |a HERBIVORY | ||
| 900 | |a NATIVE SPECIES | ||
| 900 | |a NATURAL SELECTION | ||
| 900 | |a RESOURCE ALLOCATION | ||
| 900 | |a SEED | ||
| 900 | |a SEMIARID REGION | ||
| 900 | |a SEXUAL REPRODUCTION | ||
| 900 | |a SOIL TEMPERATURE | ||
| 900 | |a SOLAR RADIATION | ||
| 900 | |a ANIMAL | ||
| 900 | |a CATTLE | ||
| 900 | |a DROUGHT | ||
| 900 | |a FEEDING BEHAVIOR | ||
| 900 | |a GENETIC SELECTION | ||
| 900 | |a PHYSIOLOGY | ||
| 900 | |a POACEAE | ||
| 900 | |a ANIMALS | ||
| 900 | |a DROUGHTS | ||
| 900 | |a SELECTION, GENETIC | ||
| 900 | |a ATER | ||
| 900 | |a ARGENTINA | ||
| 900 | |a CHACO [ARGENTINA] | ||
| 900 | |a TRICHLORIS CRINITA | ||
| 900 | |a It has been proposed that aridity and grazing are convergent selective forces: each one selects for traits conferring resistance to both. However, this conceptual model has not yet been experimentally validated. The aim of this work was to experimentally evaluate the effect of aridity and grazing, as selective forces, on drought and grazing resistance of populations of Trichloris crinita, a native perennial forage grass of the Argentinean Arid Chaco region. We collected seeds in sites with four different combinations of aridity and grazing history [semiarid/subhumid X heavily grazed/lightly grazed], established them in pots in a common garden, and subjected the resulting plants to different combinations of drought and defoliation. Our results agreed with the convergence model. Aridity has selected T. crinita genotypes that respond better to drought and defoliation in terms of sexual reproduction and leaf growth, and that can evade grazing due to a lower shoot : root ratio and a higher resource allocation to reserves [starch] in stem bases. Similarly, grazing has selected genotypes that respond better to drought and defoliation in terms of sexual reproduction and that can evade grazing due to a lower digestibility of leaf blades. These results allow us to extend concepts of previous models in plant adaptation to herbivory to models on plant adaptation to drought. The only variable in which we obtained a result opposite to predictions was plant height, as plants from semiarid sites were taller [and with more erect tillers] than plants from subhumid sites; we hypothesize that this result might have been a consequence of the selection exerted by the high solar radiation and soil temperatures of semiarid sites. In addition, our work allows for the prediction of the effects of dry or wet growing seasons on the performance of T. crinita plants. Our results suggest that we can rely on dry environments for selecting grazing-resistant genotypes and on high grazing pressure history environments for selecting drought-resistant ones. | ||
| 900 | |a 20 | ||
| 900 | |a 7 | ||
| 900 | |a 2010 | ||
| 900 | |a ^cH | ||
| 900 | |a AAG | ||
| 900 | |a AGROVOC | ||
| 900 | |a 2010Quiroga | ||
| 900 | |a AAG | ||
| 900 | |a http://ri.agro.uba.ar/files/intranet/articulo/2010Quiroga.pdf | ||
| 900 | |a 2010Quiroga.pdf | ||
| 900 | |a http://www.esapubs.org/ | ||
| 900 | |a http://www.scopus.com/inward/record.url?eid=2-s2.0-77957745950&partnerID=40&md5=227ae92f6513b9af0c650bc6c075de5a | ||
| 900 | |a ^a^b^c^d^e^f^g^h^i | ||
| 900 | |a OS | ||
| 942 | 0 | 0 | |c ARTICULO |2 udc |
| 942 | 0 | 0 | |c ENLINEA |2 udc |