Recherches pollenanalytiques dans les montagnes de Kroumirie (Tunisie septentrionale): premiers résultats

Tiba, Béchir Ben; Reille, Maurice

doi:10.3406/ecmed.1982.1004

Cited by 63 publications

(40 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Unlike temperate regions, northern Africa has few peat bogs, mires or lakes where fossil biological indicators might be well preserved within continuous Quaternary records. Holocene vegetation changes have, however, been documented from pollen data (Reille, 1976, 1977; Ben Tiba & Reille, 1982; Ballouche & Damblon, 1988; Lamb et al. , 1989, 1995, 1999; Salamani, 1991, 1993; Lamb & van der Kaars, 1995).…”

Section: Palaeodata Synthesis In Northern Africamentioning

confidence: 99%

See 1 more Smart Citation

Putative glacial refugia of Cedrus atlantica deduced from Quaternary pollen records and modern genetic diversity

Cheddadi

Fady

François

et al. 2009

Journal of Biogeography

View full text Add to dashboard Cite

Aim To investigate the impact of past environmental changes on Cedrus atlantica and its current genetic diversity, and to predict its future distribution. Location Morocco, Algeria and Tunisia. Methods Eleven fossil pollen records from these three countries were used to locate putative glacial refugia and to reconstruct past climate changes. A mechanistic vegetation distribution model was used to simulate the distribution of C. atlantica in the year 2100. In addition, a genetic survey was carried out on modern Moroccan C. atlantica. Results Pollen records indicate that Cedrus was present during the last glacial period, probably in scattered refugia, in Tunisia, Algeria and Morocco. In the Tunisian and Algerian sites, cedar expanded during the late glacial and the early Holocene, then disappeared after c. 8000 yr bp. Reconstructed mean annual precipitation and January temperature show that the last glacial period in Morocco was cooler by 10–15°C and drier by c. 300–400 mm year−1 than the climate today. Modern chloroplast microsatellites of 15 C. atlantica populations in Morocco confirm the presence of multiple refugia and indicate that cedar recolonized the Moroccan mountains fairly recently. Model simulation indicates that by the year 2100 the potential distribution of C. atlantica will be much restricted with a potential survival area located in the High Atlas. Main conclusions Environmental changes in northern Africa since the last glacial period have had an impact on the geographical distribution of C. atlantica and on its modern genetic diversity. It is possible that by the end of this century C. atlantica may be unable to survive in its present‐day locations. To preserve the species, we suggest that seedlings from modern C. atlantica populations located in the High Atlas mountains, where a high genetic diversity is found, be transplanted into the western High Atlas.

show abstract

Section: Palaeodata Synthesis In Northern Africamentioning

confidence: 99%

“…In Tunisia, the pollen records of Dar Fatma (1 and 2) in Kroumirie cover the longest period of time in the Maghreb (Ben Tiba & Reille, 1982). Despite the presence of some sedimentary hiatuses, the Dar Fatma 1 record (Fig.…”

Section: Palaeodata Synthesis In Northern Africamentioning

confidence: 99%

Putative glacial refugia of Cedrus atlantica deduced from Quaternary pollen records and modern genetic diversity

Cheddadi

Fady

François

et al. 2009

Journal of Biogeography

View full text Add to dashboard Cite

show abstract

“…Nevertheless, several authors have produced pollen curves of Q. suber from sites around the western Mediterranean Basin (e.g. Reille, 1977Reille, , 1990Ben Tiba & Reille, 1982; Table 1 Palynological criteria for the oak groups in the Navarrés-3 pollen sequence (Fig. 2 & Parra, 1984;Bernard & Reille, 1987;Pons & Reille, 1988;Peñalba, 1989;Brun, 1991;Salamani, 1991;Stevenson et al, 1993;Marret & Turon, 1994;Parra, 1994;Reille et al, 1996;Sánchez-Goñi & Hannon, 1999).…”

Section: On the Palynological Discrimination Of Quercus Subermentioning

confidence: 99%

“…In addition, charcoal analyses from archaeological sites in Portugal (Figueiral, 1995) demonstrate the occurrence of the cork oak during the late Pleistocene in western Iberia. Cork oak has been a constant and significant component in the mountain regions of North Africa since at least 33 700  (Ben Tiba & Reille, 1982). If one takes into account the bioclimatical requirements out-lined earlier, it is to be expected that glacial refugia for the cork oak were located in littoral areas and intra-mountainous valleys, preferably, but not necessarily, on siliceous substrates.…”

Section: Past and Present Distribution Of Quercus Subermentioning

confidence: 99%

See 1 more Smart Citation

Past distribution and ecology of the cork oak (Quercus suber) in the Iberian Peninsula: a pollen‐analytical approach

Carrión

Parra

Navarro

et al. 2000

Diversity and Distributions

View full text Add to dashboard Cite

This study presents pollen-analytical data from continental and offshore Iberian Peninsula sites that include pollen curves of Quercus suber, to provide information on the past distribution and ecology of the cork oak (Q. suber). Results centre on a new pollen record of Navarrés (Valencia, eastern Spain), which shows that the cork oak survived regionally during the Upper Pleistocene and was important during a mid-Holocene replacement of a local pine forest by Quercus-dominated communities. This phenomenon appears linked to the recurrence of fire and reinforces the value of the cork oak for reforestation programmes in fire-prone areas. In addition to Navarrés, other Late Quaternary pollen sequences (Sobrestany, Casablanca-Almenara, Padul, SU 8103, SU8113, 8057B) suggest last glacial survival of the cork oak in southern and coastal areas of the Peninsula and North Africa. Important developments also occur from the Late Glacial to the middle Holocene, not only in the west but also in the eastern Peninsula. It is suggested that, in the absence of human influence, Q. suber would develop in non-monospecific forests, sharing the arboreal stratum both with other sclerophyllous and deciduous Quercus and Pinus species.

show abstract

An 18 000‐year pollen and sedimentary record from the cedar forests of the Middle Atlas, Morocco

Bait

Rhoujjati

Eynaud

et al. 2014

J Quaternary Science

View full text Add to dashboard Cite

A new record from the heart of the Moroccan Middle Atlas cedar forests spans the last 18 000 years and provides valuable insight into our understanding of the natural vegetation and environmental changes. The approach is based on the study of pollen content, geochemical elements and grain size analysis. The pollen data indicate that the vegetation was dominated by herbaceous plants until 9000 BP. Such open landscape allowed greater soil erosion and an input of chemical elements from the watershed. After 9000 BP, tree cover, mainly oak, increased slightly and was accompanied by a higher taxonomic diversity. However, several steppe elements remain well represented in the area until 5000 BP, which suggests that the climate was rather dry during the first part of the Holocene. After 6000 BP, the climate became more favourable to expansion of the forest ecosystems, including Cedrus atlantica, thereby reducing erosion. A strong reduction of the tree pollen percentages is recorded after 2000 BP, which may be related to increasing human activities during the Roman period. These forest changes are concomitant with an increase of lead and copper concentrations in the record, probably related to Roman metalworking activities

show abstract

Recherches pollenanalytiques dans les montagnes de Kroumirie (Tunisie septentrionale): premiers résultats

Cited by 63 publications

References 0 publications

Putative glacial refugia of Cedrus atlantica deduced from Quaternary pollen records and modern genetic diversity

Putative glacial refugia of Cedrus atlantica deduced from Quaternary pollen records and modern genetic diversity

Past distribution and ecology of the cork oak (Quercus suber) in the Iberian Peninsula: a pollen‐analytical approach

An 18 000‐year pollen and sedimentary record from the cedar forests of the Middle Atlas, Morocco

Contact Info

Product

Resources

About