A modern pollen rain study from the central Andes region of South America

Abstract The Sundarban Mangrove Forest in the Sundarban Biosphere Reserve, located at the mouth of the Ganga–Brahmaputra Delta in India, is the most diverse mangrove ecosystem in the world. Sediment cores were taken from two widely separated islands in that reserve: Chamta (CMT) and Sudhyanyakhali (SDK). Pollen analysis and radiocarbon dating were used to study the Holocene development and dynamics of this unique ecosystem. Modern pollen rain study reveals a strong relation between modern pollen rain and the present vegetation, as well as a high rate of Phoenix palludosa pollen production.The pollen records indicate that man-grove existed at CMT from ~5960 and at SDK from ~1520 cal yr BP. Changes in relative sea level, including the frequency and intensity of inundation as well as fluctuating precipitation, have been the major factors along with geomorphic processes that control the development and dynamics of the mangrove in the area during the Holocene. The mid Holocene mangrove at CMT declined, to be progressively replaced by successive communities, and eventually reached climax stage, while the SDK site is transitional in nature. The mangrove responds rapidly to changes in environmental conditions at both locations. Because of large-scale anthropogenic interventions, it is unlikely that similar rapid responses will occur in the future.

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A modern pollen rain study from the Black Sea coast of Romania

Review of Palaeobotany and Palynology ◽

10.1016/j.revpalbo.2012.01.004 ◽

2012 ◽

Vol 174 ◽

pp. 39-47

Author(s):

Ingrid Rossignol ◽

David Kaniewski ◽

Elise Van Campo ◽

Mihai Petrescu ◽

Alexandre Baralis

Keyword(s):

Black Sea ◽

The Black Sea ◽

Modern Pollen ◽

Black Sea Coast ◽

Pollen Rain ◽

Rain Study ◽

Sea Coast

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Socioeconomic Conditions and Landowners’ Perception Affect the Intention to Restore Polylepis Forests in the Central Andes of Peru

Forests ◽

10.3390/f12020118 ◽

2021 ◽

Vol 12 (2) ◽

pp. 118

Author(s):

Lunel Joseph ◽

Raúl Marino Yaranga Cano ◽

Marco Arizapana-Almonacid ◽

Marcela Venelli Pyles ◽

Flávia Freire de Siqueira ◽

...

Keyword(s):

Rural Communities ◽

Mixed Model ◽

Linear Mixed Model ◽

Negative Impact ◽

Positive Impact ◽

Central Andes ◽

Socioeconomic Conditions ◽

Native Flora ◽

The Family ◽

Andes Region

Research Highlights: Families more dependent on crops as the main source of income of properties have a greater intention of restoring Polylepis forest areas. However, this intention reduces with the increase of family dependence on subsistence products supplied by Polylepis forests. Properties where the chances of restoration of Polylepis forests are greater are those where the educational and technical level is better. Objectives: We aimed to comprehend which socioeconomic factors of rural properties and families’ perception were determinant for the intention to restore Polylepis forests in the Central Andes region of Peru. Material and Methods: We collected data through visits and the application of questionnaires. We selected 13 rural communities in the Tulumayo River Basin. We randomly sampled 10 to 20 families in each community, depending on its size, totaling 200 families. We used generalized linear mixed model (GLMM) to test which variables affect the intention to restore the forest. Results: When crops are the main source of income in the property, the families have more intention to restore Polylepis areas, on the other hand, when Polylepis forests are an important source of products for the family subsistence, the intention to restore forests reduces, indicating that higher technological status has a positive impact on restoration. The perception that Polylepis forests are important for the existence of water sources had a positive impact on the families’ intention to restore the areas. However, the perception that Polylepis forests are important for native flora persistence had a negative impact on the intention to restore their areas. Conclusions: Our results showed that investment in improving the productivity of the properties and in the education of their landowners should increase the success of eventual programs for restoration of Polylepis forests.

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Pollen Taphonomy in a Canyon Stream

Quaternary Research ◽

10.1016/0033-5894(87)90006-8 ◽

1987 ◽

Vol 28 (3) ◽

pp. 393-406 ◽

Cited By ~ 51

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.

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MODERN POLLEN RAIN STUDIES IN EASTERN ONTARIO

Canadian Journal of Botany ◽

10.1139/b63-022 ◽

1963 ◽

Vol 41 (2) ◽

pp. 243-252 ◽

Cited By ~ 14

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.

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Chapter 27 Puquios and Aqueducts in the Central Andes of South America

Underground Aqueducts Handbook ◽

10.1201/9781315368566-28 ◽

2016 ◽

pp. 465-474 ◽

Cited By ~ 1

Author(s):

Kevin Lane

Keyword(s):

South America ◽

Central Andes

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Relación lluvia de polen-vetación en selvas de Quintana Roo

Botanical Sciences ◽

10.17129/botsci.1645 ◽

2017 ◽

pp. 31 ◽

Cited By ~ 1

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.

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