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13 resultados encontrados para: AUTOR: Hooghiemstra, Henry
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Resumen en: Español |
Resumen en español

Here, we use 30 long-term, high-resolution palaeoecological records from Mexico, Central and South America to address two hypotheses regarding possible drivers of resilience in tropical forests as measured in terms of recovery rates from previous disturbances. First, we hypothesize that faster recovery rates are associated with regions of higher biodiversity, as suggested by the insurance hypothesis. And second, that resilience is due to intrinsic abiotic factors that are location specific, thus regions presently displaying resilience in terms of persistence to current climatic disturbances should also show higher recovery rates in the past. To test these hypotheses, we applied a threshold approach to identify past disturbances to forests within each sequence. We then compared the recovery rates to these events with pollen richness before the event. We also compared recovery rates of each site with a measure of present resilience in the region as demonstrated by measuring global vegetation persistence to climatic perturbations using satellite imagery. Preliminary results indeed show a positive relationship between pre-disturbance taxonomic richness and faster recovery rates. However, there is less evidence to support the concept that resilience is intrinsic to a region; patterns of resilience apparent in ecosystems presently are not necessarily conservative through time.


2.
Capítulo de libro
*En proceso técnico. Solicítelo con el bibliotecario(a) de SIBE-San Cristóbal
Registro palinológico de los últimos 10000 años en la Laguna Quila, México
Almeida Leñero, Lucía (autor) ; Hooghiemstra, Henry (autor) ; Cleef, Antoine M. (autor) ; Islebe, Gerald A. (autor) ;
Contenido en: Vegetación, fitogeografía y paleoecología del zacatonal alpino y bosques montanos de la región central de México p. 221-237
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
54233-10 (Disponible)
Disponibles para prestamo: 1
Nota: En proceso técnico. Solicítelo con el bibliotecario(a) de SIBE-San Cristóbal

3.
Artículo
*En proceso técnico. Solicítelo con el bibliotecario de SIBE-Chetumal
A multi-proxy study of Holocene environmental change in the Maya Lowlands of Peten, Guatemala
Curtis, Jason H. (autor) ; Brenner, Mark (autor) ; Hodell, David A. (autor) ; Balser, Richard A. (autor) ; Islebe, Gerald A. (autor) ; Hooghiemstra, Henry (autor) ;
Contenido en: Journal of Paleolimnology Vol. 19, no. 2 (1998), p. 139-159 ISSN: 0921-2728
Bibliotecas: Chetumal
Cerrar
SIBE Chetumal
44481-10 (Disponible)
Disponibles para prestamo: 1
Nota: En proceso técnico. Solicítelo con el bibliotecario de SIBE-Chetumal

4.
Tesis - Doctorado
Cambios paleovegetacionales durante el holoceno en la Selva Lacandona, Chiapas / Gabriela Domínguez Vázquez
Domínguez Vázquez, Gabriela ; Islebe, Gerald A. (tutor) ; Villanueva Gutiérrez, Rogel (asesor) ; Monks Sheets, Scott William (asesor) ; Hooghiemstra, Henry (asesor) ;
Chetumal, Quintana Roo, México : El Colegio de la Frontera Sur , 2004
Clasificación: TE/560.45 / D6
Cerrar
SIBE Campeche
ECO040001671 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Chetumal
ECO030000752 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE San Cristóbal
ECO010005101 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Tapachula
ECO020006001 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Villahermosa
ECO050001922 (Disponible)
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Índice

Introducción
Objetivos e hipótesis
Método
Capítulo 1. Relictos pleistocénicos en la vegetación de la selva Lacandona
Capítulo 2. Modern pollen deposition in Lacandon forest, Chiapas, México
Capítulo 3. Evidence of a long lasting drought during the late Holocene in the Lacandon rain forest, Mexico
Discusión y conclusión
Literatura citada
Anexos


5.
- Artículo con arbitraje
*Solicítelo con su bibliotecario/a
Vegetation and climate history of montane Costa Rica since the last glacial
Islebe, Gerald A. ; Hooghiemstra, Henry (coaut.) ;
Contenido en: Quaternary science reviews Vol. 16, no. 6 (1997), p. 589-604 ISSN: 0277-3791
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

New palynological evidence from the Cordillera de Talamanca (Costa Rica) is presented. The La Chonta-1 core (2310 m a.s.l) shows the development of montane vegetation during the late Quaternary. A shorter core (La Trinidad-III) shows the Lateglacial-Holocene transition, including the La Chonta stadial based on earlier published evidence. A soil section from the paramó belt at 3100 m shows vegetation recovery after fire. Modern pollen rain was studied along an altitudinal transect from 2100 m to 3800 m at Mt Chirripó. A comparison with other palaeoecological data of the region is given to elucidate climatic and vegetational changes throughout the Central American region. Data show a cooling of 7–8°C during the Last Glacial Maximum (LGM) for montane Costa Rica, which is in accordance with data from lowland Guatemala. A 1.5° to 2.5°C temperature drop is recorded during the Younger Dryas Chron in both Costa Rica and Guatemala, but apparently not in Panama. The Lateglacial-Holocene transition in montane Costa Rica is established at 10,400 BP. Between 9000 and 8500 BP moist forest developed in mountainous Costa Rica as well as in lowland Guatemala and Panama. Environmental change during the mid-Holocene seems more affected by changes in humidity than temperature change throughout Central America. Distribution maps of paramó and montane vegetation in Costa Rica are reconstructed for 10 ka, 14 ka and 18 ka based on currently available palynological data. These data indicate that during the LGM a paramó vegetation corridor existed between northern Costa Rica and probably northern Panama.


6.
- Artículo con arbitraje
*Solicítelo con su bibliotecario/a
Holocene vegetation and water level history in two bogs of the Cordillera de Talamanca, Costa Rica
Islebe, Gerald A. ; Hooghiemstra, Henry (coaut.) ; Veer, Ron van 't (coaut.) ;
Contenido en: Vegetatio Vol. 124, no. 2 (Jun. 1996), p. 155-171 ISSN: 1948-1996
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

Pollen records of Holocene sediment cores from the Costa Rican Cordillera de Talamanca (La Chonta bog, 2310 m and La Trinidad bog, 2700 m) show the postglacial development of the montane oak forest zone from ca. 9500 to 1500 yr BP. During the early Holocene (ca. 9500-7000 yr BP), alder vegetation covered the La Chonta and La Trinidad bogs and their adjacent hills. The upper forest line is inferred to be at 2800-3000 m elevation. A Podocarpus-Quercus forest characterised the middle Holocene (ca. 70(0)°4500 yr BP). The upper forest line is located at >3000 m reaching the present-day altitudinal distribution. A Quercus forest characterised the late Holocene (ca. 4500-1500 yr BP). Compared to modern conditions, the early Holocene has similar average temperatures, but the moisture level was probably higher. Pollen evidence for the late Holocene indicates drier environmental conditions than today. In order to improve the paleoecological interpretation, we described the local vegetation and used moss samples as pollen traps at both montane bogs along strong soil moisture gradients.


7.
Artículo
A cooling event during the younger Dryas Chron in Costa Rica
Islebe, Gerald A. ; Hooghiemstra, Henry (coaut.) ; van der Borg, K. (coaut.) ;
Clasificación: AR/551.60901 / I8
Contenido en: Palaeogeography, Palaeoclimatology, Palaeoecology Vol. 117, no. 1 (1995), p. 73-80 ISSN: 0031-0182
Bibliotecas: Chetumal
Cerrar
SIBE Chetumal
ECO030004648 (Disponible)
Disponibles para prestamo: 1

8.
Artículo
Recent pollen spectra of highland Guatemala
Islebe, Gerald A. ; Hooghiemstra, Henry (coaut.) ;
Clasificación: AR G/571.845097281 / I8
Contenido en: Journal of Biogeography Vol. 22, no. 6 (1995), p. 1091-1099 ISSN: 0305-0270
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
ECO010015783 (Disponible)
Disponibles para prestamo: 1
Resumen en: Español | Inglés |
Resumen en español

Se presentan los resultados de un estudio de lluvia de polen del altiplano de Guatemala y su relación con la vegetación contemporanea. Estos resultados estan basados en un análisis polinico de 62 muestras de musgos colectadas en el zacatonal alpino, la vegetación subalpina y el bosque de abetos. Los resultados se analizaron con metodos de clasificaci6n (TWINSPAN), ordenacion (DCA) e indices de asociacion. Se presenta el grado de sobrerepresentacion y de subrepresentacion de los datos de polen con respeto a la vegetacion actual. El bosque de abetos (2800-3400 m) muestra el porcentaje mas alto de polen de Abies y de Asteraceae, el bosque subalpino (3400-4000 m) muestra el valor mas alto de polen de Juni perus, Buddleja y de Poaceae. El zacatonal alpino (4000-4200 m) no se caracteriza por un incremento de algun taxa específico. El polen de Pinus (hasta un 90%), Alnus (hasta un 40%), Quercus (hasta un 7%) y Hedyosmum (hasta un 0.8%) está presente en todos los tipos de vegetación.

Resumen en inglés

Data on modem pollen deposition are presented from highland Guatemala and their relation with modern vegetation is examined. Results are based on pollen analysis of sixty-two moss samples collected between 2800 and 4200 m elevation from alpine bunchgrassland, subalpine vegetation and fir forest. The modern pollen rain data were analyzed by classification (TWINSPAN) and ordination analysis (DCA) and association indices. The degree of over-representation and under-represen- tation of the pollen data with respect to the modem vegetation was established. The fir forest belt (2800-3400 m) shows highest percentages of Abies and Asteraceae, the subalpine forest belt (3400-4000 m) shows highest values of Juniperus, Buddleja and Poaceae. The alpine bunchgrassland (4000-4200 m) is not characterized by an increased presence of any taxon. Pinus (up to 90%), Alnus (up to 40%), Quercus (up to 7%) and Hedyosmum (up to 0.8%) pollen is recovered from all vegetation belts.


9.
Artículo
*En proceso técnico. Solicítelo con el bibliotecario de SIBE-Chetumal
The Younger Dryas climatic event in the Cordillera de Talamanca, Costa Rica (Extended abstract)
Islebe, Gerald A. (autor) ; van der Borg, Klaas (autor) ; Hooghiemstra, Henry (autor) ;
Contenido en: Geologie & Mijnbouw Vol. 74 (1995), p. 281-283 ISSN: 0016-7746
Bibliotecas: Chetumal
Cerrar
SIBE Chetumal
44563-10 (Disponible)
Disponibles para prestamo: 1
Nota: En proceso técnico. Solicítelo con el bibliotecario de SIBE-Chetumal

10.
Artículo
Pollen-based biome reconstructions for Latin America at 0, 6000 and 18 000 radiocarbon years
Marchant, R. ; Islebe, Gerald A. (coaut.) ; Hooghiemstra, Henry (coaut.) ; Markgraf, Vera (coaut.) ;
Contenido en: Climate of the Past Discussions Vol. 5 (2009), p. 369-461 ISSN: 1814-9340
Resumen en: Inglés |
Resumen en inglés

The biomisation method is used to reconstruct Latin American vegetation at 6000±500 and 18 000±1000 radiocarbon years before present (14C yr BP) from pollen data. Tests using modern pollen data from 381 samples derived from 287 locations broadly reproduce potential natural vegetation. The strong temperature gradient associated with the Andes is recorded by a transition from high altitude cool grass/shrubland and cool mixed forest to mid-altitude cool temperate rain forest, to tropical dry, seasonal and rain forest at low altitudes. Reconstructed biomes from a number of sites do not match the potential vegetation due to local factors such as human impact, methodological artefacts and mechanisms of pollen representivity of the parent vegetation

At 6000±500 14C yr BP 255 samples are analysed from 127 sites. Differences between the modern and the 6000±500 14C yr BP reconstruction are comparatively small; change relative to the modern reconstruction are mainly to biomes characteristic of drier climate in the north of the region with a slight more mesic shift in the south. Cool temperate rain forest remains dominant in western South America. In northwestern South America a number of sites record transitions from tropical seasonal forest to tropical dry forest and tropical rain forest to tropical seasonal forest. Sites in Central America show a change in biome assignment, but to more mesic vegetation, indicative of greater plant available moisture, e.g. on the Yucat´an peninsula sites record warm evergreen forest, replacing tropical dry forest and warm mixed forest presently recorded

At 18 000±1000 14C yr BP 61 samples from 34 sites record vegetation reflecting a generally cool and dry environment. Cool grass/shrubland is prevalent in southeast Brazil whereas Amazonian sites record tropical dry forest, warm temperate rain forest and tropical seasonal forest. Southernmost South America is dominated by cool grass/shrubland, a single site retains cool temperate rain forest indicating that forest was present at some locations at the LGM. Some sites in Central Mexico and lowland Colombia remain unchanged in the biome assignments of warm mixed forest and tropical dry forest respectively, although the affinities that these sites have to different biomes do change between 18 000±1000 14C yr BP and present. The “unresponsive” nature of these sites results from their location and the impact of local edaphic influence.