A Holocene environmental record reflecting vegetation, climate, and fire variability at the Páramo of Quimsacocha, southwestern Ecuadorian Andes

Jantz, Nele; Behling, Hermann

doi:10.1007/s00334-011-0327-x

Cited by 44 publications

(54 citation statements)

References 65 publications

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“…Indeed, we found no evidence of a fire history in our study area, supported by the absence of charcoal in our soil samples. The highest altitude of the closed forest (~3600 m) in our study area is similar to that reported by Wille et al (2002) and Jantz and Behling (2012) for other páramo sites in Ecuador, based on paleoecological studies. The observed wide gradient from forest to páramo differs from the observations of Bader et al (2007), who described rather abrupt treelines in a comparative study on various treelines in the Andes and in Hawaii.…”

Section: Discussionsupporting

confidence: 88%

“…If the uppermost forest is destroyed by human activities, páramo grassland from above the natural forest limit tends to colonize the cleared areas and thus over time can extend to lower altitudes than would otherwise be the case. By contrast, the upward movement of forest, attributed to the effects of contemporary global warming, has also been reported (Innes, 1991;Grabherr et al, 2010;Kessler et al, 2011;Jantz and Behling, 2012). These two factors, when combined, have potentially opposing effects, leading to complications when formulating predictive scenarios (Castaño, 2002;Grace et al, 2002;Tonneijck et al, 2006;Bader et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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A Broad Transition from Cloud Forest to Páramo Characterizes an Undisturbed Treeline in Parque Nacional Llanganates, Ecuador

Hofstede

Dickinson

Mark

et al. 2014

Arctic, Antarctic, and Alpine Research

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

A Broad Transition from Cloud Forest to Páramo Characterizes an Undisturbed Treeline in Parque Nacional Llanganates, Ecuador

Hofstede

Dickinson

Mark

et al. 2014

Arctic, Antarctic, and Alpine Research

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“…Pollen percentages were square-root transformed for the numerical analyses to remove the effect from dominant taxa and to optimize the signal-noise ratio (Jantz and Behling, 2012;Wang et al, 2014). Detrended correspondence analysis (DCA) yielded the length of the environmental gradients with the value 1.61 of standard deviation (SD).…”

Section: Discussionmentioning

confidence: 99%

Late Holocene environmental reconstructions and their implications on flood events, typhoon, and agricultural activities in NE Taiwan

Wang

Behling²,

Lee

et al. 2014

Clim. Past

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Abstract. We reconstructed paleoenvironmental changes from a sediment archive of a lake in the floodplain of the Ilan Plain of NE Taiwan on multi-decadal resolution for the last ca. 1900 years. On the basis of pollen and diatom records, we evaluated past floods, typhoons, and agricultural activities in this area which are sensitive to the hydrological conditions in the western Pacific. Considering the high sedimentation rates with low microfossil preservations in our sedimentary record, multiple flood events were. identified during the period AD 100-1400. During the Little Ice Age phase 1 (LIA 1 -AD 1400-1620), the abundant occurrences of wetland plant (Cyperaceae) and diatom frustules imply less flood events under stable climate conditions in this period. Between AD 500 and 700 and the Little Ice Age phase 2 (LIA 2 -AD 1630-1850), the frequent typhoons were inferred by coarse sediments and planktonic diatoms, which represented more dynamical climate conditions than in the LIA 1. By comparing our results with the reconstructed changes in tropical hydrological conditions, we suggested that the local hydrology in NE Taiwan is strongly influenced by typhoontriggered heavy rainfalls, which could be influenced by the variation of global temperature, the expansion of the Pacific warm pool, and the intensification of El Niño-Southern Oscillation (ENSO) events.

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“…Only a limited number of palaeoecological studies on the páramo of the Ecuadorian Andes are available; these can be broken down based on the floras to those in the northern and central Ecuadorian Andes (e.g. Colinvaux et al 1988, Hansen et al 2003, van der Hammen et al 2003, Bakker et al 2008, Jantz & Behling 2012 and those in the southern Ecuadorian Andes (Niemann & Behling 2008, Nieman et al 2009, Brunschön et al 2010, Villota et al 2012. Those studies have shown marked changes in the past vegetation and climate, as well as changing environments, from the Late Glacial to the Holocene.…”

mentioning

confidence: 99%

“…The early Holocene in the Ecuadorian Andes is marked by alternating wetter and drier phases (Hansen et al 2003, Brunschön & Behling 2009). The mid-Holocene is characterized by warmer and drier conditions, especially in the western and central Ecuadorian Andes (Hansen et al 2003, Jantz & Behling 2012. The late Holocene is generally marked by wetter and slightly cooler climatic conditions (Niemann & Behling 2008).…”

mentioning

confidence: 99%

Three millennia of vegetation and environmental dynamics in the Lagunas de Mojanda region, northern Ecuador

Villota

Behling

León‐Yánez

2017

Acta Palaeobotanica

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ABSTRACT. The pollen record from Lagunas de Mojanda, located at 3748 m a.s.l. (northern Ecuadorian Andes) reflects the vegetation and climate dynamics for the last ca 3400 cal yr BP. Páramo vegetation has been the main vegetation type since the beginning of the record. At Lagunas de Mojanda, from the last ca 3400 to 2200 cal yr BP, grass páramo was well represented mainly by Poaceae (40%) and the occurrence of Valeriana (5%), while montane forest taxa were poorly represented and subpáramo taxa were rare. The vegetation composition suggests cool and humid conditions. Between ca 2200 and ca 1300 cal yr BP, montane rainforest and subpáramo taxa had a higher presence but páramo taxa remained the main vegetation type in the study area, suggesting cool climatic conditions. From ca 1300 to ca 500 cal yr BP, páramo vegetation remained stable, with higher presence of Phlegmariurus and Isoetes, suggesting cool and humid conditions. The last ca 500 cal yr BP generally show lower frequency of montane rainforest and subpáramo taxa. Páramo vegetation reached the highest share, with the presence of Poaceae, Plantago and Ranunculus suggesting a trend of peat bog drying. Fires were present during the whole record, perhaps human-caused, but the study area does not show great disturbance except from ca 1300 to 500 cal yr BP, a period of an evident higher influx of charcoal particles coincidentally with nearby ancient human occupation.

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A Holocene environmental record reflecting vegetation, climate, and fire variability at the Páramo of Quimsacocha, southwestern Ecuadorian Andes

Cited by 44 publications

References 65 publications

A Broad Transition from Cloud Forest to Páramo Characterizes an Undisturbed Treeline in Parque Nacional Llanganates, Ecuador

A Broad Transition from Cloud Forest to Páramo Characterizes an Undisturbed Treeline in Parque Nacional Llanganates, Ecuador

Late Holocene environmental reconstructions and their implications on flood events, typhoon, and agricultural activities in NE Taiwan

Three millennia of vegetation and environmental dynamics in the Lagunas de Mojanda region, northern Ecuador

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