scholarly journals Modern pollen rain predicts shifts in plant trait composition but not plant diversity along the Andes–Amazon elevational gradient

2020 ◽  
Author(s):  
Masha T van der Sande ◽  
Mark B Bush ◽  
Dunia H Urrego ◽  
Miles Silman ◽  
William Farfan‐Rios ◽  
...  
Keyword(s):  
Plant Diversity ◽  
Elevational Gradient ◽  
Plant Trait ◽  
Modern Pollen ◽  
The Andes ◽  
Pollen Rain

scholarly journals Relationship between vegetation and modern pollen-rain along an elevational gradient on Kilimanjaro, Tanzania

The Holocene ◽  
2014 ◽  
Vol 24 (6) ◽  
pp. 702-713 ◽  
Author(s):  
Lisa Schüler ◽  
Andreas Hemp ◽  
Hermann Behling
Keyword(s):  
Elevational Gradient ◽  
Modern Pollen ◽  
Pollen Rain

An analysis of modern pollen rain on an elevational gradient in southern Peru

2004 ◽  
Vol 20 (01) ◽  
pp. 113-124 ◽  
Author(s):  
Chengyu Weng ◽  
Mark B. Bush ◽  
Miles R. Silman
Keyword(s):  
Elevational Gradient ◽  
Southern Peru ◽  
Modern Pollen ◽  
Pollen Rain

Pollen Taphonomy in a Canyon Stream

1987 ◽  
Vol 28 (3) ◽  
pp. 393-406 ◽  
Author(s):  
Patricia L. Fall
Keyword(s):  
Surface Soil ◽  
Pollen Grains ◽  
Close Correlation ◽  
Soil Samples ◽  
Alluvial Deposits ◽  
Modern Pollen ◽  
Pollen Types ◽  
Pollen Rain ◽  
Arid Steppe ◽  
Turbulent Water

AbstractSurface soil samples from the forested Chuska Mountains to the arid steppe of the Chinle Valley, Northeastern Arizona, show close correlation between modern pollen rain and vegetation. In contrast, modern alluvium is dominated by Pinus pollen throughout the canyon; it reflects neither the surrounding floodplain nor plateau vegetation. Pollen in surface soils is deposited by wind; pollen grains in alluvium are deposited by a stream as sedimentary particles. Clay-size particles correlate significantly with Pinus, Quercus, and Populus pollen. These pollen types settle, as clay does, in slack water. Chenopodiaceae-Amaranthus, Artemisia, other Tubuliflorae, and indeterminate pollen types correlate with sand-size particles, and are deposited by more turbulent water. Fluctuating pollen frequencies in alluvial deposits are related to sedimentology and do not reflect the local or regional vegetation where the sediments were deposited. Alluvial pollen is unreliable for reconstruction of paleoenvironments.

MODERN POLLEN RAIN STUDIES IN EASTERN ONTARIO

1963 ◽  
Vol 41 (2) ◽  
pp. 243-252 ◽  
Author(s):  
James E. King ◽  
Ronald O. Kapp
Keyword(s):  
United States ◽  
Long Range ◽  
Southwestern United States ◽  
Pollen Trap ◽  
Modern Pollen ◽  
Pollen Rain ◽  
Moss Polsters ◽  
Eastern Ontario

Moss polsters were collected at 15 sites between Toronto and Lake Timagami, Ontario, and at 4 localities in the Lake Timagami area for the purpose of determining the regional pollen rain and its local variations. Pollen percentages of Acer, Quercus, Ambrosia, Chenopodiaceae, Compositae, and Gramineae decrease northward and Picea, Pinus, and Betula increase at the more northerly sites. From the three most northern sites a regional pollen rain was calculated by averaging the percentages from nine pollen spectra. In this area the regional pollen rain is dominated by Picea (15%), Pinus (38%), and Betula (22%). At one site a grain of Ephedra was recovered, apparently carried in by long range drift. The nearest place that it grows naturally is in the southwestern United States. Various pollen trap types were investigated and it was found that all types of moss polsters and some types of decaying stumps (depending on their moisture-holding capacity) were effective in preserving the modern pollen rain.

scholarly journals Phylogeography of two Andean frogs: Test of vicariance versus elevational gradient models of diversification

2019 ◽  
Author(s):  
Daria Koscinski ◽  
Paul Handford ◽  
Pablo L. Tubaro ◽  
Peiwen Li ◽  
Stephen C. Lougheed
Keyword(s):  
Sequence Data ◽  
Environmental Gradients ◽  
Spatial Scales ◽  
Elevational Gradient ◽  
Northwestern Argentina ◽  
Dna Sequence Data ◽  
The Andes ◽  
Common Causes ◽  
History Of ◽  
Historical Range

ABSTRACTThe tropical and subtropical Andes have among the highest levels of biodiversity in the world. Understanding the forces that underlie speciation and diversification in the Andes is a major focus of research. Here we tested two hypotheses of species origins in the Andes: 1. Vicariance mediated by orogenesis or shifting habitat distribution. 2. Parapatric diversification along elevational environmental gradients. We also sought insights on the factors that impacted the phylogeography of co-distributed taxa, and the influences of divergent species ecology on population genetic structure. We used phylogeographic and coalescent analyses of nuclear and mitochondrial DNA sequence data to compare genetic diversity and evolutionary history of two frog species: Pleurodema borellii (Family: Leiuperidae, 130 individuals; 20 sites), and Hypsiboas riojanus (Family: Hyllidae, 258 individuals; 23 sites) across their shared range in northwestern Argentina. The two showed concordant phylogeographic structuring, and our analyses support the vicariance model over the elevational gradient model. However, Pleurodema borellii exhibited markedly deeper temporal divergence (≥4 Ma) than H. riojanus (1-2 Ma). The three main mtDNA lineages of P. borellii were nearly allopatric and diverged between 4-10 Ma. At similar spatial scales, differentiation was less in the putatively more habitat-specialized H. riojanus than in the more generalist P. borellii. Similar allopatric distributions of major lineages for both species implies common causes of historical range fragmentation and vicariance. However, different divergence times among clades presumably reflect different demographic histories, permeability of different historical barriers at different times, and/or difference in life history attributes and sensitivities to historical environmental change. Our research enriches our understanding of the phylogeography of the Andes in northwestern Argentina.

scholarly journals Relación lluvia de polen-vetación en selvas de Quintana Roo

2017 ◽  
pp. 31 ◽  
Author(s):  
Gerald A. Islebe ◽  
Rogel Villanueva-Gutiérrez ◽  
Odilón Sánchez-Sánchez
Keyword(s):  
Zea Mays ◽  
Quintana Roo ◽  
Vegetation Types ◽  
Pollen Data ◽  
Indicator Taxa ◽  
Modern Pollen ◽  
Pollen Content ◽  
Ordination Techniques ◽  
Ordination Analysis ◽  
Pollen Rain

Modern pollen rain was studied along a 450 km long transect between Cancun-La Unión (Belizean border). Ten moss samples were collected in different vegetation types and analyzed for pollen content. The data were analyzed with classification (TWINSPAN), ordination analysis (DCA) and different association indices. Classification and ordination techniques allowed us to recognize three different pollen signals from semievergreen forest (with Maclura, Apocynaceae, Moraceae, Sapotaceae, Araceae, Cecropia, Celtis, Eugenia and Bursera), acahual (with con Coccoloba, Metopium, Anacardiaceae, Urticales, Melothria, Croton, Palmae) and disturbed vegetation (with Zea mays, Mimosa and Asteraceae ) . The degree of over-representation and underrepresentation of the pollen data with respect to the modem vegetation was established, being under-represented mostly entomophilous species. We can conclude that the actual pollen signal can be used for calibrating paleosignals, if clear groups of indicator taxa can be established.

Representativeness of tree diversity in the modern pollen rain of Andean montane forests

2013 ◽  
Vol 25 (2) ◽  
pp. 481-490 ◽  
Author(s):  
Nele Jantz ◽  
Jürgen Homeier ◽  
Hermann Behling
Keyword(s):  
Tree Diversity ◽  
Montane Forests ◽  
Modern Pollen ◽  
Pollen Rain

scholarly journals How forest gaps shaped plant diversity along an elevational gradient in Wolong National Nature Reserve?

2019 ◽  
Vol 29 (7) ◽  
pp. 1081-1097 ◽  
Author(s):  
Li Chen ◽  
Wangya Han ◽  
Dan Liu ◽  
Guohua Liu
Keyword(s):  
Plant Diversity ◽  
Nature Reserve ◽  
Elevational Gradient ◽  
Forest Gaps ◽  
National Nature Reserve

Modern pollen rain, vegetation and climate along elevation gradients in the upper-middle Yellow River: numerical approaches for quantitative environmental reconstruction

Grana ◽  
2019 ◽  
Vol 59 (4) ◽  
pp. 258-272
Author(s):  
Hua Zhang ◽  
Qiuchi Wan ◽  
Zhuo Zheng ◽  
Haicheng Wei ◽  
Kangyou Huang
Keyword(s):  
Yellow River ◽  
Environmental Reconstruction ◽  
Elevation Gradients ◽  
Modern Pollen ◽  
Pollen Rain ◽  
Vegetation And Climate ◽  
Numerical Approaches

Modern Pollen Rain in the Southeast Missouri Ozarks

1990 ◽  
Vol 124 (2) ◽  
pp. 263 ◽  
Author(s):  
James K. Huber
Keyword(s):  
Modern Pollen ◽  
Southeast Missouri ◽  
Pollen Rain
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