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Boletín de la Sociedad Geológica Mexicana

versión impresa ISSN 1405-3322

Bol. Soc. Geol. Mex vol.70 no.1 Ciudad de México abr. 2018

https://doi.org/10.18268/bsgm2018v70n1a3 

Articles

The Paleoanthropocene of the Yucatán Peninsula: palynological evidence of environmental change

El Paleoantropoceno de la peninsula de Yucatán: evidencias palinológicas de cambio ambiental

Gerald A. Islebe1  * 

Nuria Torrescano-Valle1 

Alejandro A. Aragón-Moreno1 

Alejandro A. Vela-Peláez1 

Mirna Valdez-Hernández1 

1El Colegio de la Frontera Sur, Herbario, Departamento Conservación de la Biodiversidad, Avenida Centenario km 5.5, Apartado Postal 424, CP 77014, Chetumal, Quintana Roo, México.


Abstract

Human activities have changed and shaped landscape conditions of the Yucatán Peninsula for more than 4000 years. Several paleoecological studies showed the oldest pollen record of corn-based agriculture is from northern Belize, with an estimated age of 3300 BC.

Several other studies report maize between 1500 and 3000 BC from northern Guatemala and the Mexican part of the Yucatán Peninsula. After 3500 cal yr BP several paleoecological studies showed a marked tendency to drier climatic conditions. In pollen records, increased drought is expressed as a reduced presence of fossil arboreal pollen. Pollen records with the presence of Zea mays also show other taxa, which are indicators of disturbance in different vegetation types.

Keywords: Paleoanthropocene; Holocene; Yucatán Peninsula; fossil pollen; Zea mays

Resumen

Las actividades humanas han influenciado sobre los paisajes de la península de Yucatán desde más de 4000 años. Varios estudios paleoecológicos muestran actividades de agricultura, el registro polínico más antiguo de maíz (Zea mays L.) proviene del norte de Belice, con una edad aproximada de 3300 BC. Otros estudios paleoecológicos del norte de Guatemala y de la porción mexicana de la península de Yucatán muestran registros de maíz fósil con rangos de edad desde 1500 a 3000 A.C. La mayoría de los registros muestran una marcada tendencia a condiciones de mayor sequía después de los 3500 A.C. Estas tendencias de sequía se registran como reducción del polen fósil arbóreo. El registro polínico de Z. mays está acompañado de taxa que indican diferentes grados de perturbación en la vegetación natural.

Palabras clave: Paleoantropoceno; Holoceno; península de Yucatán; polen fósil; Zea mays

1. Introduction

The Yucatán Peninsula has a long history of human impact and use, starting in the middle Holocene until the present, or Anthropocene. The interaction of human with natural forces has shaped the landscape of the Yucatán Peninsula on different scales and therefore offers a valuable opportunity of understanding past and present sustainability (DeClerk et al., 2010; Douglas et al., 2016; Ford and Nigh, 2016). The term Anthropocene was introduced by Crutzen and Stoermer (2000) to highlight the human influence on the environment and some researchers even proposed the term Palaeoanthropocene as the period of first anthropogenic change until the early industrial revolution (Foley et al., 2013). More specific to the area occupied by Maya culture and their influence on the environment, the term Mayacene was proposed to describe the period for the last 3000 years (Beach et al., 2015).

In this paper we expand the idea of the Paleoanthropocene to the last 4000 years, as human impact on natural resources is evident in southern Mexico and Mesoamerica (Voorhies, 1996; Leyden, 2002) from this environmentally influential period. The human-environment-climate interaction goes back at least 4000 years, when early settlers became established and agriculture began transforming the landscape during the Archaic period. Abandonment of cities is strongly but not exclusively linked to climatic variability (Fedick, 2010; McNeil et al., 2010; Dunning et al., 2012, 2015; McNeil, 2012; Douglas et al., 2016), and several studies have highlighted Maya cultural development related to climatic events and environmental conditions using different proxies like isotope chemistry, sediment geochemistry and pollen (Hodell et al., 1995; Islebe et al., 1996; Kennett et al., 2012; Medina-Elizalde and Rohling, 2012). Opposing views on geographical determinism are ongoing in scholarly discussions, and it seems clear as a general consensus that the rise and fall of Maya culture is multifactorial. The periods of Maya cultural development are based on archaeology and are usually divided into Archaic (7000-2000 before Christ [BC]; Voorhies, 1996), Preclassic (2000 BC-250 AD), Classic (250-900 AD), and Postclassic and Contact periods (900-1500 AD; Coe, 1993; Webster, 2002; Dunning et al., 2015). This subdivision does not necessarily reflect environmental or climatic change in each period.

Influence of Maya culture on the environment was reflected mainly in land cover changes, including deforestation in a broad sense, although there is ongoing discussion on the extent and relevance leading to culture demise and political breakdown (Aimers, 2007). This discussion includes different views, ranging from widespread forest reduction causing increasing aridity (Oglesby et al., 2010; Cook et al., 2012) to minimal forest cover loss due to adequate forest management (Ford and Nigh, 2009, 2016) and regional limited deforestation (Carrillo-Bastos et al., 2012), depending on the cultural period and climatic conditions. Climate variability is a key factor, mainly helping to explain precipitation variability in the Maya lowlands (Hodell et al., 1995; Dahlin, 2002; Medina-Elizalde and Rohling, 2012; Carrillo-Bastos et al., 2013; Douglas et al., 2016). The ancient Maya culture had profound knowledge of agriculture and forest management, and archaeological studies (Fedick, 2003) have shown transformation of wetlands for agricultural purposes with specific drainage channels. Others studies described the construction of terraces to reduce erosion and foster agricultural production (Dunning and Beach, 2000). Forest recovery after agricultural practices and climatic impact have shown that primary vegetation has a cycle of nearly 80 years (Mueller et al., 2010), and ancient Maya had a well-developed agroforestry system (Ford and Nigh, 2009).

In this paper we summarize available published data on fossil maize (Zea mays L.) in pollen records from the Yucatán Peninsula, showing the first use of maize in agriculture, and the relationship with environmental and climatic change. Fossil pollen of corn (Z. mays) is an excellent proxy for human impact, as its presence provides a direct link between Maya culture and agricultural activities (Islebe and Leyden, 2006; Holst et al., 2007).

2. Environmental setting

2.1. CLIMATE

The climate of the Yucatán Peninsula is of a seasonal nature. There are mainly two distinct seasons. The rainy season between May and November and the dry season between December and April define the annual precipitation distribution. During the winter months (December - March) arctic air incursions known locally as nortes can bring additional precipitation to the Yucatán Peninsula (Torrescano-Valle and Folan, 2015). The intra-annual displacement of the Intertropical Convergence Zone determines the seasonality of the precipitation (Haug et al., 2001, 2003; Méndez and Magaña, 2010). Additionally, there are differences across the region. The north zone has an annual precipitation between 600 and 900 mm, while in the south it is between 900 and 1400 mm. There is also a moisture gradient between the east and west coast, being the eastern coast of the Yucatán Peninsula influenced by jet streams providing humid air during the rainy season.

2.2. VEGETATION

The dominant vegetation type is seasonal dry tropical forest, but a variety of forest types and other vegetation types exist on the Yucatán Peninsula, such as mangroves, among other (Miranda, 1958). Seasonal dry tropical forest is the dominant vegetation type. High evergreen forest, with canopy greater than 30 m, can be found in the southern Yucatán Peninsula, northern Guatemala, and Belize.

3. Methods

Published results on Zea mays (corn) occurrence in the Yucatán Peninsula were reviewed. A complete list of sites, with their respective radiocarbon age, and calibrated ages are listed in Table 1. Original calibrated ages from cited studies were accepted. A map was elaborated of sediment cores where Z. mays was found (Figure 1). Seven sites with a total of 57 samples of Zea mays of the Yucatán Peninsula were used to summarize pollen and ancient Maya cultural periods (Figure 2).

Table 1. List of sites recording Zea mays in Belize, Guatemala and México. Dates are original data. 

Site Oldest recorded date
México
Carrillo-Bastos et al. 2010 Tzib 3500 cal yr BP
Aragón-Moreno et al. 2012 Ría Lagartos 3600 cal yr BP
Gutiérrez-Ayala et al. 2012 Petenes 2079 cal yr BP
Carrillo-Bastos et al. 2013 Ría Lagartos 3840 cal yr BP
Torrescano-Valle and Islebe, 2015 Silvituc 4100 cal yr BP
Leyden et al. 1998 Cobá 2850 cal yr BP
Leyden et al. 1996 San José Chulchacá 1180 AD
Guatemala
Islebe et al. 1996 Petén Itzá 2000 cal yr BP
Mueller et al. 2009 Petén Itzá 3000 cal yr BP
Wahl et al. 2014 Puerto Arturo 4600 cal yr BP
Wahl et al. 2013 Holmul 3330 cal yr BP
Wahl et al. 2007 El Mirador 4650 cal yr BP
Belize
Jones et al. 1994 Colha 4500 cal yr BP
Pohl et al. 1996 Cobweb 5000 cal yr BP
Rushton et al. 2012 Lamanai 3650 cal yr BP

Figure 1. A) Geographical position of the Yucatán Peninsula with localities of sites. B) Zea mays records related to age and sites. C) Numbered sites with name and authors. 

Figure 2. Zea mays presence in pollen records of the Yucatán Peninsula grouped according to Maya cultural periods. 

4. Results and discussion

For the Yucatán Peninsula, the oldest maize pollen grain comes from Cob swamp (Belize), and is dated at 3360 BC (Pohl et al., 1996). From northern Guatemala, Wahl et al. (2006, 2013, 2014) gave ages of first maize pollen between 2600 and 2300 BC. From the Mexican part of Yucatán Peninsula the oldest maize pollen evidence comes from Lake Silvituc and is dated at 2100 BC (Torrescano-Valle and Islebe, 2015). From the northern part of the Yucatán Peninsula, the first recorded corn pollen has an estimated age of 1800 BC (Aragón-Moreno et al., 2012; Carrillo-Bastos et al., 2013). From the central region of the Yucatán Peninsula, Z. mays pollen is dated at 1500 BC (Carrillo-Bastos et al., 2010). From Lamanai, in northern Belize, an estimated age of 1600 BC was given by Rushton et al. (2013) for first Z. mays appearance. Different studies have made relevant contributions on the origin and domestication of corn (Matsuoka et al., 2002; Doebley, 2004; Sluyter and Domínguez, 2006; Piperno et al., 2009). Paleoecological and genetic evidence have identified teosinte (Zea mays ssp. parviglumis and ssp. mexicana) as the most important ancestor of corn. This allowed detection of the highlands of Oaxaca and Guerrero (Holst et al., 2007) as the center of domestication, although pollen grain size might be insufficient to separate teosinte from corn. Evidence of early fossils of domesticated maize was presented by Piperno et al. (2009) with starch grains of phytoliths in the Rio Balsas valley between 9000 and 8600 calibrated years Before Present (cal yr BP). After maize was domesticated it spread into Central America around 7800 cal yr BP (Piperno, 2011). The presence of fossil corn pollen in southern Mexico (Voorhies, 1996) is direct evidence of the use of corn since 4000 BC. For additional information on the geographical spread of corn we refer to Staller et al. (2009).

4.1. IMPACT ON LANDSCAPE

Reduction of forest cover combined with increase taxa indicating disturbance, and the presence of Zea mays pollen, has been used as an indicator of change in the landscape and/or induced change by climatic factors (Wiseman, 1978; Leyden, 2002). Other research included the importance of wetlands as suitable habitat for agriculture (Beach et al., 2008; Luzzadder-Beach et al., 2012). Other indicative pollen taxa that imply change in vegetation cover include Poaceae, Asteraceae, Cucurbitaceae, and Malvaceae, among others disturbance taxa (Wiseman, 1978; Islebe et al., 1996; Leyden et al., 1998), which generally appear before and after corn pollen records in many pollen diagrams. Slash and burn agriculture, different forms of agroforestry, and forestry harvesting were main agricultural activities. The sustainability of those activities is under academic scrutiny (Demarest, 2004; Ford and Nigh, 2009; Lentz et al., 2014, 2015; Douglas et al., 2016). Pohl et al. (1996) reported a strong deforestation around 2500 BC in northern Belize, which could also be interpreted as a regional drought signal (Torrescano-Valle and Islebe, 2006; Mueller et al., 2009; Carrillo-Bastos et al., 2010). The drying signal around 3500 cal yr BP reported by Mueller et al. (2009) agrees with large regional drying trends from Cariaco Basin, Venezuela (Haug et al., 2001); Haiti (Hodell et al., 1991); Lake Valencia, Venezuela (Curtis et al., 1999); and from several lakes of the African tropics (Gasse, 2000). Intensified farming activities are dated between 1500 and 1300 BC with increased presence of corn in northern Belize (Pohl et al., 1996; Rushton et al., 2013). From the northern part of the Yucatán Peninsula, a similar pattern of climatic drying is observed after 3500 cal yr BP (Aragón-Moreno et al., 2012; Gutiérrez-Ayala et al., 2012). Z. mays was recorded in near-coastal lake sediments with an interpolated age of 1900 BC (Aragón-Moreno et al., 2012; Carrillo-Bastos et al., 2013). Changes in nearby coastal mangrove composition, mainly the turnover of species composition from Rhizophora mangle L. to dominant Conocarpus erectus L., with reduced pollen representation of forest taxa is indicative of a drying trend in the northern part of the Yucatán Peninsula (Aragón-Moreno et al., 2012; Carrillo-Bastos et al., 2013). The trend toward drier conditions had a few short phases of increased precipitation, but the terminal Preclassic period experienced increasing corn agriculture with drier climatic conditions (Figure 2). The terminal Preclassic drought and its subsequent population abandonment (150-250 AD) were strong enough to cause the end of Z. mays agriculture in the northern and driest parts of the Yucatán Peninsula (Carrillo-Bastos et al., 2013). In the middle Classic, corn appeared again in the sedimentary records.

The intensity and geographical extension of forest reduction is under discussion, due to differences in interpretation of paleoecological proxies (Anselmetti et al., 2007; Carrillo-Bastos et al., 2012; Cook et al., 2012; Taylor et al., 2012; Dunning et al., 2015; Douglas et al., 2016).

Cook et al. (2012) considered that human induced deforestation led to an increased reduction in precipitation, which could have strengthened the natural drying trend during the late Classic period, and eventually led to the Maya collapse. Carrillo-Bastos et al. (2012), based on reconstructing the geographical distribution, its precipitation regime, and change of the most dominant vegetation type (the semi-evergreen forest) of the Yucatán Peninsula, found that deforestation was never complete. Some areas suffered from a higher deforestation rate than others, probably due to higher population densities and agricultural requirements of nearby population centers. The northern Yucatán Peninsula showed with a lower precipitation regime at 550 BC with this geographical information system approach and precipitation reduction did not affect in a uniform manner due to geographical differences of precipitation regimes. At 450 AD a widespread forest reduction can be observed, but no complete deforestation associated to intensified agriculture or amplified climatic change at this period (Carrillo-Bastos et al., 2012). Many forested areas switched to a more open character, and open vegetation types were most similar to savanna type vegetation, like at present in some parts of the central peninsula. In the central Yucatán Peninsula, two records provide evidence of fossil Z. mays, namely in the Lake Cobá record (Leyden et al., 1998) and a core from Lake Tzib (Carrillo-Bastos et al., 2010). Fossil pollen of corn was found at Cobá at 850 BC, and at Lake Tzib around 1500 BC. Anselmetti et al. (2007), based on a soil erosion study of Lake Salpetén, northern Guatemala, found that intense soil erosion layers (like Maya clay) occurred after initial land clearance in the early Preclassic and later (Rosenmeier et al., 2002), while in lakes from the Yucatán Peninsula, conspicuous erosion horizons are not observed. Figure 2 summarizes the number of sites with corn and its relative variation with cultural periods. Fossil pollen data agree with paleocological records and the cultural decline of ancient Maya culture (900-1200 AD) is shown by less fossil corn presence.

4.2. ASSOCIATED TAXA TO Zea mays IN POLLEN RECORDS

Other fossil pollen taxa that appear together with Zea mays in sediment cores mainly indicate forest disturbance caused by human activity or natural catastrophic events, like hurricanes or extensive fires (Islebe et al., 2001; Mueller et al., 2009). Other economical taxa that are recorded include Cucurbita (Pohl et al., 1996) and Gossypium (Wendel et al., 2010), which has been domesticated in the Yucatán Peninsula. Several paleoecological studies have shown similar results of taxa indicating disturbance due to land use change, mostly Cecropia peltata L., Croton sp., Acacia sp., Asteraceae, Solanaceae (Capsicum), Convolvulaceae, Malvaceae, Poaceae, and Chenopodiaceae-Amaranthaceae (Torrescano-Valle and Islebe, 2015). Species of the previously mentioned taxa include weeds (e.g., Chenopodiaceae-Amaranthaceae), fast growing herbaceous species (like Asteraceae, Convolvulaceae, Malvaceae). And pioneer trees and shrubs of early successional stages after forest disturbance (like Cecropia, Croton, Solanaceae, Acacia, and other members of the legume family) described by Nigh (2008), and Varela Scherrer and Trabanino (2016). Additionally, charred particles increase in pollen records with the presence of Z. mays (Aragón-Moreno et al., 2012).

5. Conclusions

The research line we have adopted offers relevant information on the establishment of early agriculture in the Yucatán Peninsula. The relevance goes beyond the oldest record. Multiproxy environmental studies and interdisciplinary research aim at consistent chronologies of fossil evidence, and to include robust quantitative tools to establish a clear concept about the relation human and environment.

The concepts of Paleoanthropocene or Mayacene (Beach et al., 2015) seem attractive for the Yucatán Peninsula and northern Mesoamerica, considering the strong link between, climate, and environment and ancient Maya culture. The oldest corn record comes from northern Belize and is dated at 3300 BC. Several pollen records from Belize, Guatemala, and the Yucatán Peninsula present early fossil corn records between 1500 and 3000 BC. Temporal variability of corn appearance is due to different occupational histories of the area, different water availability, and differential fossil pollen preservation. Climate driven deforestation can be observed in many records around 3500 cal yr BP, with a clear reduction of arboreal taxa and increase of taxa indicating disturbance or land use change. Human driven deforestation is related in some areas to Maya agriculture, shown by high soil erosion rates in some areas, although not recorded in most lakes of the Yucatán Peninsula. Finally, we conclude that Z. mays is an excellent indicator and proxy of the beginning of the (paleo) Anthropocene in the Yucatán Peninsula.

Acknowledgements

CONACyT is acknowledged for funding the projects Variabilidad climática y paleoecologia de los últimos 1500 años del sureste de México, Sinopsis paleo-actuo ecológica de las selvas de Quintana Roo, and Reconstrucción de Paleoambientes y Modelación Climática de la región oeste de la Península de Yucatán. Helpful comments of Ligia E. Urrego, one anonymous reviewer and the editors are acknowledged.

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Received: October 12, 2016; Revised: April 26, 2017; Accepted: August 15, 2017

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