Two lake sediment cores from Madre del Sur mountain range,Guerrero State, west-central Mexico were studied to examine the pastdynamics of the dry forest biome. Pollen, spores of coprophilousfungi, cyanobacteria and lithological changes are presented. The390-cm Tixtla core (1730'N, 99°24W, 1400 maltitude) represents the last 2700 cal. yr; the 340-cm Huitziltepeccore (17°45N, 99°28W, 1430 m altitude) representsthe last 2050 cal. yr. Pollen shows climate-dependent competitionbetween dry deciduous forest (with Asteraceae, Chamaesyce-type,Bursera, Euphorbia, Myrica andLysiloma-Pithecellobium-type as main components) and moister(mesophyllous) forest (with Pinus, Quercus, Alnus andJuglans). Human impact on the environment is apparent duringthe entire record, as evidenced by crop cultivation (Zea mays,Amaranthus, Capsicum, Chenopodium), coprophilous fungi(Podospora-type and Sporormiella-type), deforestation (at Tixtla in particular) and lake eutrophication, ie, cyanobacteria blooms. Environmental change at both sites is summarized as follows. Period 1 (2700-2450 cal. yr BP): abundant dry deciduous forest and climate conditions drier than today. Period 2 (2450-1950 cal. yr BP): little change in proportions of dry deciduous and mesophyllous forest but floral composition of the forests differed between sites. Human occupation was low. Period 3 (1950-1550 cal. yr BP): dry deciduous forest decreased while mesophyllous forest increased, indicating more humid climatic conditions. Populations expanded significantly around 1950 cal. yr BP. Period 4 (1550-1070 cal. yr BP): maximum expansion of mesophyllous forest. Climate was more humid than today. Pre-Hispanic populations at Tixtla reached high numbers leading to deforestation and eutrophication. Period 5 (1070-c. 750 cal. yr BP): shows abundant mesophyllous forest and lowest proportions of dry deciduous forest. Climate continued to be humid. There is evidence of forest harvesting, crop cultivation and dense human population. Period 6 (c. 750-225 cal. yr BP): dry deciduous forest expanded and mesophyllous forest decreased. There was significant deforestation by pre-Hispanic people around Lake Tixtla. High population densities and frequent fires at both sites caused eutrophication of the lakes. Domesticated herbivores were introduced ∼ad 1500 and the presence of dung is reflected in the record of coprophilous fungi. Period 7 (the last 225 calendar years): the basins were used intensively by local people and their cattle. Dry deciduous forest continued to increase while mesophyllous forest decreased.
Almeida-Lenero, L. , Hooghiemstra, H. , Cleef, A.M. and van Geel, B.2005: Holocene climatic and environmental change from pollen records of Mexican lakes Zempoala and Quila . Review of Palaeobotany and Palynology136, 63-92 .
2.
Anderson, R.S. and van Devender, T.R.1995: Vegetation history of paleoclimates of the coastal lowlands of Sonora, Mexico-pollen records from packrat middens . Journal of Environments30, 295-306 .
3.
Ben Brown, R.1985: A summary of Late-Quaternary pollen records from Mexico west of the Isthmus of Tehuantepec. In Bryant, V.M. and Holloway, R.G. , editors, Pollen records of Late-Quaternary North American sediments. American Association of Stratigraphic Palynologists, 71-93.
4.
Berger, A. and Loutre, M.F.1991: Insolation values for the climate of the last 10 million years . Quaternary Science Reviews10, 297-317 .
5.
Berrio, J.C. , Hooghiemstra, H. , Marchant, R. and Rangel, O.2002: Late-glacial and Holocene history of the dry forest area in the south Colombian Cauca Valley . Journal of Quaternary Science17, 667-682 .
6.
Bosch, J.M. and Hewlett, J.D.1982: A review of catchment experiments to determine the effect of vegetation changes on water yield and evapotranspiration . Journal of Hydrology55, 3-23 .
7.
Brenner, M. , Hodell, D.A. , Curtis, J.H. , Rosenmeier, M.F. , Binford, M.W. and Abbott, M.B.2001: Abrupt climate change and pre-Columbian cultural collapse. In Markgraf, V. , editor, Interhemispheric climate linkages. Academic Press, 87-103.
8.
Bruijnzeel, L.A.1990: Hydrology of moist tropical forests and conversion: a state of knowledge review. UNESCO-IHP Publication of the Humid Tropics Programme, 224-224 pp.
9.
Bryant, V.M. and Holloway, R.G. , editors 1985: Pollen records of Late-Quaternary North American sediments. American Association of Stratigraphic Palynologists .
10.
Curtis, J.H. , Hodell, D.A. and Brenner, M.1996: Climate variablility on the Yucatan Peninsula (Mexico) during the past 3500 years, and implications for Maya cultural evolution . Quaternary Research46, 37-47 .
11.
Davis, O.K.1987. Spores of the dung fungus Sporormiella: increased abundance in historic sediments and before Pleistocene megafaunal extinction . Quaternary Research28, 290-294 .
12.
Davis, S.D. , Heywood, V.H. , Herrera-Macbryde, O. , Villa-Lobos, J. and Hamilton, A.C.1997: Centres of plant diversity. Vol. 3, The Americas. Wold Wildlife Fund (WWF) and World Conservation Union (IUCN) , 562-562 pp.
13.
Diego-Perez, N. and Ludlow-Wiechers, B. 2003: El bosque caducifolio en Tixtla Guerrero. Unpublished manuscript, UNAM, Ciudad México.
14.
Escamilla, M.G. 1995: Estudio del sistema agrícola de barbecho en una comunidad nahuatl, Huiziltepec, Guerrero, México. Graduate Dissertation in Biology. Facultad de Ciencias, Universidad Nacional Autónoma de México.
15.
Faegri, K. and Iversen, J.1989: Textbook of pollen analysis (fourth edition). Wiley, 328-328 pp.
16.
Flores, O. and Gerez, P.1994: Biodiversidad y conservación en México: vertebrados, vegetación y uso del suelo. 2nd edition. Comisión Nacional para el Conocimiento y uso de la Biodiversidad, Universidad Nacional Autónoma de Mexico , 439-439 pp.
17.
Fonseca, R. and Lorea, F. 1980: Recursos bióticos de la Cuenca del Rio Zopilote. Area Filo de Caballos. Unpublished manuscript, Archivo de la Comisión de Biologías de Campo. Facultad de Ciencias, UNAM. Ciudad México.
18.
Fonseca, R. , Velázquez, E. and Domínguez, E.2003: Estudios florísticos en Guerrero No. 16. In Diego-Pérez, N. ańd Fronseca, R. , editors, Bosque de Quercus en Tixtla. Facultad de Ciencias, Universidad Nacional Autónoma de México (UNAM), Prensas de Ciencias, Ciudad México , 45-45 pp.
19.
García, E.1988: Modificaciones al sistema de clasificación climática de Köeppen. Instituto de Geografia. Universidad Nacional Autónoma de México, Cd. Méexico , 276-276 pp.
20.
González-Quintero, L.1980: Paleoecologia de un sector costero de Guerrero, México (3000 años). Memorias III Coloquio sobre Paleobotánica y Palynología. Colección Cientifica Prehistorica 86, Instituto Nacional de Antropología e Historia , 133-158.
21.
Grimm, E.C.1987: CONISS: a Fortran 77 program for stratigraphically constrained cluster analysis by the method of the incremental sum squares . Computers and Geosciences13, 13-35 .
22.
Gual, M.1995: Estudios florísticos en Guerrero No. 6. Cañon del Zopilote, área Venta Vieja. Diego-Pérez, N. and Fonseca, R. , editors, Facultad de Ciencias. Universidad Nacional Autónoma de México (UNAM) . Prensas de Ciencias, 39-39 pp.
23.
Haug, G.H. , Günther, D. , Peterson, L.C. , Sugman, D.M. , Hughen, K.A. and Aeschlimann, B.2003: Climate and collapse of Maya civilization . Science299, 1731-1735 .
24.
Herrera, L.F. and Urrego, L.E.1996: Atlas de polen de plantas utiles y cultivadas de la Amazonia colombiana/Pollem atlas of useful and cultivated plants in the Colombian Amazon region . Estudios en la Amazonia colombianal/Studies on the Colombian Amazonia 11. Topenbos Colombia, 462462 pp.
25.
Hodell, D.A. , Curtis, J.H. , Jones, G.A. , Higuera-Gundy, A. , Brenner, M. , Binford, M.W. and Dorsey, K.T.1991: Reconstruction of Caribbean climate change over the past 10,500 years . Nature352, 790-793 .
26.
Hodell, D.A. , Curtis, J.H. and Brenner, M.1995: Possible role of climate in the collapse of Classic Maya civilization . Nature375, 391-394 .
27.
Hooghiemstra, H. 1984: Vegetational and climatic history of the high plain of Bogotá, Colombia. Dissertationes Botanicae 79, J. Cramer Verlag, 368 pp.
28.
Hooghiemstra, H. and Van der Hammen, T.2004: Quaternary ice-age dynamics in the Colombian Andes: developing an understanding of our legacy . Philosophical Transactions Royal Society London B359, 173-181 .
29.
Hornbeck, J.W. and Swank, W.T.1992: Watershed ecosystem analysis as a basis for multiple use management of eastern forest . Ecological Applications2, 238-247 .
30.
Islebe, G. and Sánchez, O.2002: History of Late Holocene vegetation at Quintana Roo, Caribbean coast of Mexico . Plant Ecology1960, 187-192 .
31.
Islebe, G.A. , Hooghiemstra, H. , Brenner, M. , Curtis, J.H. and Hodell, D.A.1996: A Holocene vegetation history from lowland Guatemala . The Holocene6, 265-271 .
32.
Juárez-Jaimes, V. and Martínez-Mena, A.1992: Flora Palinológica de Guerrero No. 2. Simaroubaceae. In Ludlow, B. , Diego, N. and Márquez, J. , editors, Facultad de Ciencias. Universidad Nacional Autónoma de México (UNAM) . Prensas de Ciencias, 11-11 pp.
33.
Leyden, B.W. , Brenner, M.A. and Dahlin, B.1998: Cultural and climatic history of Coba, a lowland Maya city in Quintana Roo, México . Quaternary Research49, 111-122 .
34.
López, J. 1984: Estudio geomorfológico de la región de Omiltemi, Guerrero. Reporte Tócnico, Gobierno del Estado de Guerrero. Unpublished manuscript.
35.
Lozano-Garciía, S. and Ortega-Guerrero, B.1998: Late Quaternary environmental changes of the central part of the Basin of Mexico; correlation between Texoco and Chalco basins . Review of Palaeobotany and Palynology99, 77-93 .
36.
Lozano-Garcíia, S. , Ortega-Guerreo, B. , Caballero-Miranda, M. and Urrutia-Fucugauchi, B.1993: Late Pleistocene and Holocene palaeoenvironments of Chalco Lake, Central Mexico . Quaternary Research40, 332-342 .
Marchant, R. , Behling, H. , Cleef, A. , Harrison, S. , Hooghiemstra, H. , Markgraf, V. , Prentice, C. , Absy, M.L. , Ager, T. , Anderson, R. , Baied, C. , Bjöorck, S. , Byrne, R. , Bush, M. , Duivenvoorden, J. , Flenley, J. , de Oliveira, P. , van Geel, B. , Graf, K. , Heberle, S. , van der Hammen, T. , Hansen, B. , Horn, S. , Kuhry, P. , Ledru, M.-P. , Leyden, B. , Garcia-Lozano, S. , Melief, A.B.M. , Moreno, P. , Neville, Moar, T. , Prieto, A.R. , van Reenen, G. , Salgado-Labouriau, M.S. , Schäbitz, F. and Schreve-Brinkman, E.J. in review: Pollen based biome reconstructions for Latin America at 0, 6000 and 18,000 radiocarbon years BP . Journal of Biogeography.
39.
Metcalfe, S.E. , Bimpson, A. , Courtice, A.J. , O'Hara, S.L. and Taylor, D.M.1997: Climate change at the monsoon/westerly boundary in northern Mexico . Journal of Paleolimnology17, 155-171 .
40.
Metcalfe, S.E. , O'Hara, S.L. , Caballero, M. and Davis, S.J.2000: Records of late Pleistocene-Holocene climatic change in Mexico-a review . Quaternary Science Reviews19, 699-721 .
41.
Metcalfe, S.E. , Say, A. , Black, S. , McCulloch, R. and O' Hara, S.L.2002: Wet conditions during the Last Glaciation in the Chihuahuan desert, Alta Babicora basin, Mexico . Quaternary Research57, 91-101 .
42.
Meyer, E.R.1973: Late Quaternary paleoecology of the Cuatro Ciénagas basin, Coahuila, Mexico . Ecology54, 982-995 .
43.
Müller, M.J. , Baltes, K.H. and Werle, D.1983: Handbuch der ausgewählter Klimastationen der Erde. 3rd edition. Universität Trier, Forschungsstelle Bodenerosion Mertesdorf , 346-346 pp.
44.
Munk, A.1957: Danish Pyrenomycetes . Dansk Botanisk Arkiv17, 1-491 .
45.
Núñez, P. and Ludlow-Wiechers, B.1998: Flora Palinológica de Guerrero No. 6. Salicaceae. Ludlow, B. and Hooghiemstra, H. , editors, Facultad de Ciencias. Universidad Nacional Autónoma de Mexico (UNAM) , Prensas de Ciencias, 2222 pp.
46.
O'Hara, S.L. and Metcalfe, S.E.1997: The climate of Mexico since the Aztec period . Quaternary International43/44, 25-31 .
47.
O'Hara, S.L. , Metcalfe, S.E. and Street-Perrot, F.A.1994: On the arid margin: the relationship between climate, humans and environment. A review of evidence from the highlands of Central Mexico . Chemosphere28, 1-26 .
48.
Olivera, L. , Ludlow-Wiechers, B. and Fonseca, R.M.1998: Flora Palinológica de Guerrero No. 7. Anacardiaceae. Ludlow, B. and Hooghiemstra, H. , editors, Facultad de Ciencias. Universidad Nacional Autónoma de Mexico (UNAM) , Prensas de Ciencias, 66-66 PP.
49.
Olvera, M.1997: Flora Palinológica de Guerrero No. 5. Menyanthaceae, Nymphaeaceae, Pontederiaceae y Typhaceae. Ludlow, B. and Hooghiemstra, H. , editors, Facultad de Ciencias. Universidad Nacional Autónoma de Mexico (UNAM) , Prensas de Ciencias, 28-28 pp.
50.
Palacios-Chávez, R. , Ludlow-Wiechers, B. and Villaneuva-G., R.1991: Flora palinologica de la Reserva de la Biosfrera de Sian Ka'an, Quintana Roo, Mexico. Centro de Investigaciones de Quinatano Roo (CiQRO), Chetumal, Quintana Roo, 321-321 pp.
51.
Palacios-Fest, M.R. , Carreñlo, A.L. , Ortega-Ramírez, J.R. and Alvarado-Valdéz, G.2002: A paleoenvironmental reconstruction of Laguna Babícora, Chihuahua, Mexico based on ostracode paleoecology and trace elements shell chemistry . Journal of Paleolimnology27, 185-206 .
52.
Pennington, R.T. , Prado, D.E. and Pendry, C.A.2000: Neotropical seasonally dry forests and Quaternary vegetation changes . Journal of Biogeography27, 261-273 .
53.
Peralta, S.1995: Estudios Florísticos en Guerrero No. 5. Cañon del Zopilote, Papalotepec. Diego-Pérez, N. and Fonseca R. , editors, Facultad de Ciencias. Universidad Nacional Autónoma de México (UNAM) , Prensas de Ciencias, 39-39 pp.
54.
Pope, K.O. , Pohl, M.E.D. , Jones, J.G. , Lentz, D.L. , Von Nagy, C. , Vega, F.J. and Quitmyer, I.R.2001: Origin and environmental setting of ancient agriculture in the lowlands of Mesoamerica . Science292, 1370-1373 .
55.
Rice, D.S. and Rice, P.M.1990: Population size and population change in the central Peten Lakes Region, Guatemala. In Culbert, T.P. and Rice, D.S. , editors, Precolumbian population history in the Maya Lowlands. University of New Mexico Press , 123-148.
56.
Rosenmeier, M.F.Hodell, D.A. , Brenner, M. , Curtis, J.H. , Martin, J.B. , Anselmetti, F.S. , Ariztegui, D. and Guilderson, T.P.2002: Influence of vegetation change on watershed hydrology: implications for paleoclimatic interpretation of lacustrine δ18O records . Journal of Paleolimnology27, 117-131 .
57.
Roubik, D.W. and Moreno, J.E.1991: Pollen and spores of Barro Colorado Island. Monographs in Systematic Botany, Vol. 36. Missouri Botanical Garden, 270-270 pp.
58.
Rzedowski, J.1983: Vegetación de México, 2nd edition. Editorial Limusa, México, 432-432 pp.
59.
Secretaría de Programación y Presupuesto1981: Cartas edafológicas. Hojas México y Guadalajara. Esc. 1:1,000,000.
60.
Siebe, C.G. , Macías, J.L. , Abrams, M. , Elizarraras, R.S. , Castro, R. and Delgado, H.1995: Quaternary explosive volcanism and pyroclastic deposits in East-Central Mexico: implications for future hazards. In Chacko, J.J. and Whitney, J.A. , editors, Guide of geological excursions for the 1995 annual meeting of the Geological Society of America, New Orleans, Book 1, 1-48. Basin Research Institute, Baton Rouge, Louisiana, USA .
61.
Stednick, J.D.1996: Monitoring the effects of timber harvest on annual water yield . Journal of Hydrology176, 79-95 .
62.
Toledo, C. 1982: El género Bursera (Burseraceae) en el estado de Guerrero, México. Unpublished Graduate Dissertation in Biology. Facultad de Ciencias, UNAM.
63.
Trejo, I. and Rodolfo, D.2002: Floristic diversity of Mexican seasonally dry tropical forest . Biodiversity and Conservation11, 2063-2048 .
64.
Turner, B.L., II1990: Population reconstruction for the central Maya lowlands: 1000 B.C. to A.D. 1500. In Culbert, T.P and Rice, D.S. , editors, Precolumbian population history in the Maya Lowlands. University of New Mexico Press, 301-343.
65.
Van Devender, T.R.1990: Late Quaternary vegetation and climate of Sonora desert, United States and Mexico. In Betancourt, J.L. , Devender, T.R. and Martin, P.S. , editors, The last 40,000 years of biotic change. University of Arizona Press, 104-133.
66.
Van Geel, B.1978: A palaeoecological study of Holocene peat bog sections in Germany and The Netherlands . Review of Palaeobotany and Polynology25, 1-120 .
67.
van Geel, B.2001: Non-pollen palynomorphs. In Smol, J.P. , Birks, H.J.B. and Last, W.M. , editors, Tracking change using lake sediments. Volume 3, 99-119. Terrestrial, algal, and siliceous indicators. Kluwer Academic Publishers .
68.
van Geel, B. and Andersen, S.T.1988: Fossil ascospores of the parasitic fungus Ustulina deusta in Eemian deposits in Denmark . Review of Palaeobotany and Palynology56, 89-93 .
69.
van Geel, B. and Grenfell, H.R.1996: Spores of Zygnemataceae. In Jansonius, J. and McGregor, D.C. , editors, Palynology: principles and applications. American Association of Stratigraphic Palynologists Foundation , Volume 1, 173-179.
70.
van Geel, B. and Renssen, H.1998: Abrupt climate change around 2650 BP in North-West Europe: evidence for climatic teleconnections and a tentative explanation. In Issar, A.S. and Brown, N. , editors, Water, environment and society in times of climatic change. Kluwer, 21-41.
71.
van Geel, B. , Hallewas, D.P. and Pals, J.P.1983: A Late Holocene deposit under the Westfriese Zeedijk near Enkhuizen (Prov. of N-Holland, The Netherlands): palaeoecological and archaeological aspects . Review of Palaeobotany and Palynology38, 269-335 .
72.
van Geel, B. , Klink, A.G. , Pals, J.P. and Wiegers, J.1986: An Upper Eemian lake deposit from Twente, eastern Netherlands . Review of Palaeobotany and Palynology47, 31-61 .
73.
van Geel, B. , Mur, L.R. , Ralska-Jasiewiczowa, M. and Goslar, T.1994: Fossil akinetes of Aphnizomenon and Anabaena as indicators for medieval phosphate-eutrophication of Lake Gosciaz (Central Poland) . Review of Palaeobotany and Palynology83, 97-105 .
74.
van Geel, B. , Buurman, J. and Waterbolk, H.T.1996a: Archaeological and palaeoecological indications for an abrupt climate change in The Netherlands and evidence for climatological teleconnections around 2650 BP . Journal of Quaternary Science11, 451-460 .
75.
van Geel, B. , Odgaard, B.V. and Ralska-Jasiewiczowa, M.1996b: Cyanobacteria as indicators of phosphate-eutrophication of lakes and pools in the past . Pact50, 399-415 .
76.
van Geel, B. , van der Plicht, J. , Kilian, M.R. , Klaver, E.R. , Kouwenberg, J.H.M. , Renssen, H. , Reynaud-Farrera, I. and Waterbolk, H.T.1998: The sharp rise of Δ14C ca. 800 cal. bc: possible causes, related climatic teleconnections and the impact on human environments . Radiocarbon40, 535-550 .
77.
van Geel, B. , Buurman, J. , Brinkkemper, O. , Schelvis, J. , Aptroot, A. , Van Reenen, G. and Hakbijl, T.2003: Environmental reconstruction of a Roman period settlement site in Uitgeest (The Netherlands), with special reference to coprophilous fungi . Journal of Archaeological Science30, 873-883 .
78.
Vargas, A. and Ludlow-Wiechers, B.1992: Flora Palinológica de Guerrero No. 3. Araliaceae. Ludlow, B. , Diego, N. and Máarquez, J. , editors, Facultad de Ciencias. Universidad Nacional Autónoma de México (UNAM) , Prensas de Ciencias, 15-15 pp.
79.
Velázquez, E. , Fonseca, R. and Dominguez-Licona, E.2003: Estudios Floristicos en Guerrero No. 16. Bosque de Quercus en Tixtla de Guerrero. Diego-Pérez, N. and Fonseca R. , editors, Facultad de Ciencias. Universidad Nacional Autónoma de Méexico (UNAM) , Prensas de Ciencias.
80.
Vázquez-Santana, S. and Martínez-Mena, A.1991: Flora Palinológica de Guerrero No. 1. Onagraceae: Fuchsia, Hauya y Oenothera. Ludlow, B. , Diego, N. and Márquez, J. , editors, Facultad de Ciencias. Universidad Nacional Autónoma de México (UNAM) , Prensas de Ciencias, 16-16 pp.
81.
Wilkins, W.H.1934: Studies in the genusUstulina with special reference to parasitism. I. Introduction, survey of previous literature and host index. Transactions of the British Mycological Society18, 320-346 .
82.
Wille, M. , Hooghiemstra, H. , Behling, H. , van der Borg, K. and Negret, A.J.2001: Environmental change in the Colombian subandean forest belt from 8 pollen records: the last 50 kyr . Vegetation History and Archaeobotany10, 61-77 .
83.
Zamudio, S. and Ludlow-Wiechers, B.1993: Flora Palinológica de Guerrero No. 4 Lentibulariaceae, Pinguicula. Ludlow, B. , Diego, N. and Márquez, J. , editors, Facultad de Ciencias. Universidad Nacional Autónoma de México (UNAM) , Prensas de Ciencias, 16-16 pp.
