The influence of natural fire and cultural practices on island ecosystems: Insights from a 4,800 year record from Gran Canaria, Canary Islands
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The influence of natural fire and cultural practices on island ecosystems : Insights from a 4,800 year record from Gran Canaria, Canary Islands. / Ravazzi, Cesare; Mariani, Michela; Criado, Constantino; Garozzo, Lorena; Naranjo-Cigala, Agustín; Perez-Torrado, Francisco J.; Pini, Roberta; Rodriguez-Gonzalez, Alejandro; Nogué, Sandra; Whittaker, Robert J.; Fernández-Palacios, José María; de Nascimento, Lea.
In: Journal of Biogeography, Vol. 48, No. 2, 2021, p. 276-290.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - The influence of natural fire and cultural practices on island ecosystems
T2 - Insights from a 4,800 year record from Gran Canaria, Canary Islands
AU - Ravazzi, Cesare
AU - Mariani, Michela
AU - Criado, Constantino
AU - Garozzo, Lorena
AU - Naranjo-Cigala, Agustín
AU - Perez-Torrado, Francisco J.
AU - Pini, Roberta
AU - Rodriguez-Gonzalez, Alejandro
AU - Nogué, Sandra
AU - Whittaker, Robert J.
AU - Fernández-Palacios, José María
AU - de Nascimento, Lea
PY - 2021
Y1 - 2021
N2 - Aim: Long-term ecological data provide a stepped frame of island ecosystem transformation after successive waves of human colonization, essential to determine conservation and management baselines. However, the timing and ecological impact of initial human settlement on many islands is still poorly known. Here, we report analyses from a 4800-year sedimentary sequence from Gran Canaria (Canary Islands), with the goal of disentangling forest responses to natural fire from early human pressure on the island. Location: La Calderilla, a volcanic maar caldera at 1,770 m a.s.l. on Gran Canaria. Taxon: Plants and fungi. Methods: A core from the caldera infill was analysed for sediment properties, pollen, micro- and macrocharcoal, with radiocarbon and biochronology dating. Fossil data were statistically zoned and interpreted with the help of cross-correlation and ordination analyses. Surface samples and a pollen–vegetation training set were used as modern analogues for vegetation reconstruction. Results: Before human settlement (4,800–2,000 cal. yr bp), pine (Pinus canariensis) pollen dominated. Extensive dry pine forests characterized the highlands, although with temporary declining phases, followed by prompt (sub-centennial scale) recovery. Towards 2,280 cal. yr bp there was a shift to open vegetation, marked by an increase in coprophilous spores. Coincidental with independent evidence of human settlement in the pine belt (2,000–470 cal. yr bp) there was a decline of pine and a peak in charcoal. Following historic settlement (470–0 cal. yr bp), pollen producers from anthropogenic habitats, secondary vegetation and coprophilous fungi increased in abundance, reflecting higher pressure of animal husbandry and farming. Modern moss polsters reflect extensive reforestation since 1950 ce (Common Era). Main conclusions: From 4,800 cal. yr bp, the pristine vegetation covering the Gran Canaria highlands was a mosaic of dry pine forests and open vegetation. The pine forests sustained intense fires, which may well have promoted habitat diversity. Human interference was initiated around 2,280 cal. yr bp probably by recurrent cultural firing and animal husbandry, triggering a steady trend of forest withdrawal and expansion of grasses and scrubs, until the final disappearance of the pine forest locally in the 20th century. Grasslands were found to be of ancient cultural origin in the summit areas of Gran Canaria, although they underwent an expansion after the Castilian Conquest.
AB - Aim: Long-term ecological data provide a stepped frame of island ecosystem transformation after successive waves of human colonization, essential to determine conservation and management baselines. However, the timing and ecological impact of initial human settlement on many islands is still poorly known. Here, we report analyses from a 4800-year sedimentary sequence from Gran Canaria (Canary Islands), with the goal of disentangling forest responses to natural fire from early human pressure on the island. Location: La Calderilla, a volcanic maar caldera at 1,770 m a.s.l. on Gran Canaria. Taxon: Plants and fungi. Methods: A core from the caldera infill was analysed for sediment properties, pollen, micro- and macrocharcoal, with radiocarbon and biochronology dating. Fossil data were statistically zoned and interpreted with the help of cross-correlation and ordination analyses. Surface samples and a pollen–vegetation training set were used as modern analogues for vegetation reconstruction. Results: Before human settlement (4,800–2,000 cal. yr bp), pine (Pinus canariensis) pollen dominated. Extensive dry pine forests characterized the highlands, although with temporary declining phases, followed by prompt (sub-centennial scale) recovery. Towards 2,280 cal. yr bp there was a shift to open vegetation, marked by an increase in coprophilous spores. Coincidental with independent evidence of human settlement in the pine belt (2,000–470 cal. yr bp) there was a decline of pine and a peak in charcoal. Following historic settlement (470–0 cal. yr bp), pollen producers from anthropogenic habitats, secondary vegetation and coprophilous fungi increased in abundance, reflecting higher pressure of animal husbandry and farming. Modern moss polsters reflect extensive reforestation since 1950 ce (Common Era). Main conclusions: From 4,800 cal. yr bp, the pristine vegetation covering the Gran Canaria highlands was a mosaic of dry pine forests and open vegetation. The pine forests sustained intense fires, which may well have promoted habitat diversity. Human interference was initiated around 2,280 cal. yr bp probably by recurrent cultural firing and animal husbandry, triggering a steady trend of forest withdrawal and expansion of grasses and scrubs, until the final disappearance of the pine forest locally in the 20th century. Grasslands were found to be of ancient cultural origin in the summit areas of Gran Canaria, although they underwent an expansion after the Castilian Conquest.
KW - ancient grasslands
KW - fire ecology
KW - forest disturbance
KW - human impact
KW - island ecology
KW - palaeoecology
KW - Pinus canariensis
KW - reforestation
U2 - 10.1111/jbi.13995
DO - 10.1111/jbi.13995
M3 - Journal article
AN - SCOPUS:85096754712
VL - 48
SP - 276
EP - 290
JO - Journal of Biogeography
JF - Journal of Biogeography
SN - 0305-0270
IS - 2
ER -
ID: 252553966