Chasmophytic vegetation and mesoclimates of rock outcrops in Ventania (Buenos Aires, Argentina)
We studied the relationships between mesoclimate variations of rock outcrops and the composition of the chasmophytic communities over a W-E altitudinal gradient (500-1243 m a.s.l.) in the Sierras Australes (Ventania). In transitory weather stations located on 5 sites we recorded climatic variables h...
| Autores principales: | , |
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| Formato: | Artículo revista |
| Lenguaje: | Inglés |
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Sociedad Argentina de Botánica
2015
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| Materias: | |
| Acceso en línea: | https://revistas.unc.edu.ar/index.php/BSAB/article/view/11018 |
| Aporte de: |
| id |
I10-R325-article-11018 |
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| record_format |
ojs |
| institution |
Universidad Nacional de Córdoba |
| institution_str |
I-10 |
| repository_str |
R-325 |
| container_title_str |
Boletín de la Sociedad Argentina de Botánica |
| language |
Inglés |
| format |
Artículo revista |
| topic |
disposición de especies en el paisaje mesoclimas serranos comunidades vegetales Sierras Australes linaje de especies. landscape arrangement of species mountain mesoclimates plant communities Sierras Australes species lineage. |
| spellingShingle |
disposición de especies en el paisaje mesoclimas serranos comunidades vegetales Sierras Australes linaje de especies. landscape arrangement of species mountain mesoclimates plant communities Sierras Australes species lineage. Kristensen, María Julia Frangi, Jorge Luis Chasmophytic vegetation and mesoclimates of rock outcrops in Ventania (Buenos Aires, Argentina) |
| topic_facet |
disposición de especies en el paisaje mesoclimas serranos comunidades vegetales Sierras Australes linaje de especies. landscape arrangement of species mountain mesoclimates plant communities Sierras Australes species lineage. |
| author |
Kristensen, María Julia Frangi, Jorge Luis |
| author_facet |
Kristensen, María Julia Frangi, Jorge Luis |
| author_sort |
Kristensen, María Julia |
| title |
Chasmophytic vegetation and mesoclimates of rock outcrops in Ventania (Buenos Aires, Argentina) |
| title_short |
Chasmophytic vegetation and mesoclimates of rock outcrops in Ventania (Buenos Aires, Argentina) |
| title_full |
Chasmophytic vegetation and mesoclimates of rock outcrops in Ventania (Buenos Aires, Argentina) |
| title_fullStr |
Chasmophytic vegetation and mesoclimates of rock outcrops in Ventania (Buenos Aires, Argentina) |
| title_full_unstemmed |
Chasmophytic vegetation and mesoclimates of rock outcrops in Ventania (Buenos Aires, Argentina) |
| title_sort |
chasmophytic vegetation and mesoclimates of rock outcrops in ventania (buenos aires, argentina) |
| description |
We studied the relationships between mesoclimate variations of rock outcrops and the composition of the chasmophytic communities over a W-E altitudinal gradient (500-1243 m a.s.l.) in the Sierras Australes (Ventania). In transitory weather stations located on 5 sites we recorded climatic variables hourly and simultaneously during 3-4 days at each season for 2 years. We used phytosociological data obtained with the relevé method by Frangi y Bottino (1995) in sites with same topography that weather stations. The analysis showed the influence of aspect on mesoclimates, since physical properties of rocks enhance thermal contrast originated in direct sun radiation, then, it showed altitudinal gradients. Sites to S (550 m a.s.l.) and SW (850 m a.s.l.) was shadowy, humid with low evaporation, and have a common species assemblage; at higher altitude lower temperatures favour microthermic species: endemic, Subantarctic or Andean. North-facing lower site was the hottest and driest biotope; includes endemisms, xerothermophilous southern-Brazilian, and northwestern Argentina species connected through the Andean-pampean mountainous arch. Northeast-facing mid-elevation outcrops were floristically and mesoclimatically transitional between both lower sites, lacking xerothermophilous and Subantarctic species. Summit outcrops, evaporative, sunny and relatively cold, had lower richness. These mountains enclose mesoclimates, species and communities exclusive to the Pampas, whose arrangement in the landscape are coherent with their lineage. |
| publisher |
Sociedad Argentina de Botánica |
| publishDate |
2015 |
| url |
https://revistas.unc.edu.ar/index.php/BSAB/article/view/11018 |
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AT kristensenmariajulia chasmophyticvegetationandmesoclimatesofrockoutcropsinventaniabuenosairesargentina AT frangijorgeluis chasmophyticvegetationandmesoclimatesofrockoutcropsinventaniabuenosairesargentina AT kristensenmariajulia vegetacioncasmofiticaymesoclimasdeafloramientosrocososenventaniabuenosairesargentina AT frangijorgeluis vegetacioncasmofiticaymesoclimasdeafloramientosrocososenventaniabuenosairesargentina |
| first_indexed |
2024-09-03T22:48:19Z |
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2024-09-03T22:48:19Z |
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1809216909697089536 |
| spelling |
I10-R325-article-110182024-09-03T22:47:33Z Chasmophytic vegetation and mesoclimates of rock outcrops in Ventania (Buenos Aires, Argentina) Vegetación casmofítica y mesoclimas de afloramientos rocosos en Ventania (Buenos Aires, Argentina) Kristensen, María Julia Frangi, Jorge Luis disposición de especies en el paisaje mesoclimas serranos comunidades vegetales Sierras Australes linaje de especies. landscape arrangement of species mountain mesoclimates plant communities Sierras Australes species lineage. We studied the relationships between mesoclimate variations of rock outcrops and the composition of the chasmophytic communities over a W-E altitudinal gradient (500-1243 m a.s.l.) in the Sierras Australes (Ventania). In transitory weather stations located on 5 sites we recorded climatic variables hourly and simultaneously during 3-4 days at each season for 2 years. We used phytosociological data obtained with the relevé method by Frangi y Bottino (1995) in sites with same topography that weather stations. The analysis showed the influence of aspect on mesoclimates, since physical properties of rocks enhance thermal contrast originated in direct sun radiation, then, it showed altitudinal gradients. Sites to S (550 m a.s.l.) and SW (850 m a.s.l.) was shadowy, humid with low evaporation, and have a common species assemblage; at higher altitude lower temperatures favour microthermic species: endemic, Subantarctic or Andean. North-facing lower site was the hottest and driest biotope; includes endemisms, xerothermophilous southern-Brazilian, and northwestern Argentina species connected through the Andean-pampean mountainous arch. Northeast-facing mid-elevation outcrops were floristically and mesoclimatically transitional between both lower sites, lacking xerothermophilous and Subantarctic species. Summit outcrops, evaporative, sunny and relatively cold, had lower richness. These mountains enclose mesoclimates, species and communities exclusive to the Pampas, whose arrangement in the landscape are coherent with their lineage. Vegetación casmofítica y mesoclimas de afloramientos rocosos en Ventania (Buenos Aires, Argentina). Estudiamos las relaciones entre las variaciones mesoclimáticas de roquedales y la composición de las comunidades casmofíticas sobre un gradiente altitudinal (500-1243 m s.n.m.) W-E en las Sierras Australes (Ventania). En 5 estaciones meteorológicas transitorias se registraron variables climáticas horaria y simultáneamente durante 3-4 días cada estación del año durante 2 años. Se utilizaron datos de censos fitosociológicos (20 relevés) realizados por Frangi y Bottino (1995) en sitios con topografía similar a las estaciones meteorológicas. El análisis mostró la influencia de la exposición sobre los mesoclimas, ya que las propiedades físicas de las rocas aumentan los contrastes térmicos causados por la radiación solar directa, luego evidenció gradientes altitudinales. Los sitios S (550 m s.n.m.) y SW (850 m s.n.m.) fueron sombríos, húmedos, poco evaporantes, y compartieron especies; a mayor altitud las bajas temperaturas favorecieron las especies microtérmicas: endémicas, subantárticas y andinas. El sitio basal al N fue el biotopo más caliente y seco; incluyó endemismos y especies xerotermófilas austrobrasileñas y del NW argentino. Los faldeos NE fueron florística y mesoclimáticamente transicionales entre los roquedales basales; sin especies subantárticas y xerotermófilas. Las cumbres, evaporantes, soleadas y frescas, poseyeron menor riqueza. Las sierras albergan mesoclimas, especies y comunidades exclusivas para las Pampas, cuya disposición en el paisaje es coherente con su linaje. Sociedad Argentina de Botánica 2015-04-23 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artículo original application/pdf https://revistas.unc.edu.ar/index.php/BSAB/article/view/11018 10.31055/1851.2372.v50.n1.11018 Boletín de la Sociedad Argentina de Botánica (Journal of the Argentine Botanical Society; Vol. 50 No. 1 (2015): Marzo; 35-46 Boletín de la Sociedad Argentina de Botánica; Vol. 50 Núm. 1 (2015): Marzo; 35-46 Boletín de la Sociedad Argentina de Botánica; v. 50 n. 1 (2015): Marzo; 35-46 1851-2372 0373-580X 10.31055/1851.2372.v50.n1 eng https://revistas.unc.edu.ar/index.php/BSAB/article/view/11018/11595 |