Ecology of the Pteridophytes on the Southern Slopes of Mt. Kilimanjaro. Part II: Habitat Selection

 

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Abstract

Based on the evalutation of 957 vegetation plots on the southern slope of Mt. Kilimanjaro, habitat preferences for 140 species of pteridophytes were evaluated. Using the average percentage cover value, and taking into account the pteridophyte flora's composition, life form spectra and its spectra of seasonal growth pattern, eight vegetation formations were recognized. Ferns contributed less than 1 % of the vegetation cover of salt marshes, ruderal vegetation, grasslands and (sub-)alpine heathlands. In contrast, pteridophytes constituted the most important vascular plant group on rocks, where 64 species were found, forming about two-thirds of the vegetation cover. With respect to alpha and beta diversity and fern biomass, luxuriant montane forest was the main habitat for pteridophytes on Mt. Kilimanjaro. Here 130 pteridophyte species (93 % of the whole pteridophyte flora of the study area), on average, contributed 16 % of the total vegetation cover. Epiphytic ferns, tree ferns and filmy ferns had their main distribution between 1900 and 2400 m, in a zone coinciding with the maximum rainfall on Mt. Kilimanjaro's southern slope.

Poikilohydrous species were typical of dry habitats, such as on rocks, in meadows or along roadsides, but they also occurred in the often sun-exposed epiphyte layer in moist montane forests. Deciduous species, which were in many cases fire resistant, had a similar distribution; however, inside the forest belt they were restricted to the lower and upper parts, where fires are a common phenomenon. Evergreen species were the dominant group in swamps, forests and forest clearings.

Compared to other volcanoes in East Africa, Mt. Kilimanjaro is distinctly richer in fern species in general and in filmy ferns, tree ferns and epiphytic ferns in particular, suggesting that the forest belt of the southern slope of Mt. Kilimanjaro is wetter than those of other high mountains in East Africa.

References

• 01 Beaman,  R. S., and Beaman,  J. H.. (1997) Distribution and diversity patterns in the Pteridophytes of Mount Kinabalu: an application of geographical information system (GIS) technology. Holttum Memorial Volume. Johns, R. J., ed. Kew; Royal Botanic Gardens pp. 161-171
  Google Scholar
• 02 Beck,  E.,, Scheibe,  R.,, and Senser,  M.. (1983);  The vegetation of the Shira plateau and the western slopes of Kibo (Mount Kilimanjaro, Tanzania).  Phytocoenologia. 11 (1) 1-30
  Google Scholar
• 03 Benl,  G.. (1977);  Ferns in the Cameroons II. The pteridophytes of the evergreen forests.  Fern Gaz.. 11 (5) 285-296
  Google Scholar
• 04 Berrie,  A.. (1989);  The ecology and distribution of pteridophytes of Zomba Mt., Malawi.  Fern Gaz.. 13 (5) 291-316
  Google Scholar
• 05 Biedinger,  N., and Fischer,  E.. (1996);  Epiphytic vegetation and ecology in central African forests (Rwanda, Zaire).  Ecotropica. 2 121-142
  Google Scholar
• 06 Braun-Blanquet,  J.. (1964) Pflanzensoziologie. Wien; 865 pp.
  Google Scholar
• 07 Bussmann,  R. W., and Beck,  E.. (1995);  The forests of Mt. Kenya (Kenya), a phytosociological synopsis.  Phytocoenologia. 25 (4) 467-560
  Google Scholar
• 08 Cody,  M. L.. (1986) Diversity, rarity, and conservation in mediterranean-climate regions. Conservation Biology The Science of Scarcity and Diversity. Soulé, M. E., ed. Sunderland; Sinauer pp. 122-152
  Google Scholar
• 09 Coetzee,  J. A.. (1967) Pollen analytical studies in East and Southern Africa. Palaeoecology of Africa, Vol. 3
  Google Scholar
• 10 Coutts,  H. H.. (1969);  Rainfall of the Kilimanjaro area.  Weather. 24 66-69
  PubMedGoogle Scholar
• 11 Dzwonko,  Z., and Kornaś,  J.. (1978);  A numerical analysis of the distribution of pteridophytes in Zambia.  Zesz. Nauk. Univ. Jagiell. Prace Bot.. 6 39-49
  PubMedGoogle Scholar
• 12 Dzwonko,  Z., and Kornaś,  J.. (1994);  Patterns of species richness and distribution of pteridophytes in Rwanda (Central Africa): a numerical approach.  J. Biogeog.. 21 491-501
  PubMedGoogle Scholar
• 13 Faden,  R. B.. (1994) Pteridophytes (ferns and fern allies). Upland Kenya Wild Flowers, 2nd edn. Agnew, A. D. Q. and Agnew, S., eds. Nairobi; East Africa Natural History Society
  Google Scholar
• 14 Fernandes,  E. C. M.,, Oktingati,  A.,, and Maghembe,  J.. (1984);  The Chagga homegardens: a multistoried agroforestry cropping system on Mt. Kilimanjaro (Northern Tanzania).  Agroforestry Systems. 2 73-86
  PubMedGoogle Scholar
• 15 Frahm,  J.-P.. (1994);  Scientific results of the BRYOTROP Expedition to Zaire and Rwanda. 2. The altitudinal zonation of the bryophytes on Mt. Kahuzi, Zaire.  Tropical Bryology. 9 153-167
  PubMedGoogle Scholar
• 16 Frey,  W.,, Kürschner,  H.,, and Seifert,  U. H.. (1995);  Scientific results of the BRYOTROP Expedition to Zaire and Rwanda. 7. Life strategies of epiphytic bryophytes from tropical lowland and montane forests, ericaceous woodlands and the Dendrosenecio subparamo of the eastern Congo basin and the adjacent mountains (Parc National de Kahuzi-Biega/Zaire, Foret de Nyungwe/Rwanda).  Tropical Bryology. 11 129-149
  PubMedGoogle Scholar
• 17 Hall,  J. B., and Swaine,  M. D.. (1976);  Classification and ecology of closed-canopy forest in Ghana.  J. Ecol.. 64 913-951
  PubMedGoogle Scholar
• 18 Hastenrath,  S.. (1973);  Observations on the periglacial morphology of Mts. Kenya and Kilimanjaro, East Africa.  Z. Geomorph. N. F.. 16 161-179
  PubMedGoogle Scholar
• 19 Hedberg,  O.. (1951);  Vegetation belts of the East African mountains.  Svensk Bot. Tidskrift.. 45 140-202
  PubMedGoogle Scholar
• 20 Hedberg,  O.. (1964);  Features of afroalpine plant ecology.  Acta Phytogeographica Suecica. 49 1-144
  PubMedGoogle Scholar
• 21 Hemp,  A.. (1997, printed 1999);  New fern records for Kilimanjaro.  J. East Afr. Nat. Hist.. 86 37-42
  PubMedGoogle Scholar
• 22 Hemp,  A.. (1999);  An ethnobotanical study of Mt. Kilimanjaro.  Ecotropica. 5 147-165
  PubMedGoogle Scholar
• 23 Hemp,  A.. (2001 a);  Ecology of the pteridophytes at the southern slopes of Mt. Kilimanjaro. Part I: Altitudinal distribution.  Plant Ecology. 153 in press
  PubMedGoogle Scholar
• 24 Hemp,  A.. (2001 b);  Three new fern records for Kilimanjaro.  J. East Afr. Nat. Hist.. 90 in press
  PubMedGoogle Scholar
• 25 Hemp,  A.. (2001 c) Life forms and strategies of forest ferns on Mt. Kilimanjaro. Life forms and strategies in tropical forests. Stuttgart; Ulmer Verlag in press
  Google Scholar
• 26 Hemp,  A., and Beck,  E.. (2001);  Erica excelsa as a component of Mt. Kilimanjaro's forests.  Phytocoenologia.. 31 (4) in press
  PubMedGoogle Scholar
• 27 Hemp,  A.,, Hemp,  C.,, and Winter,  J. C.. (1999);  Der Kilimanjaro - Lebensräume zwischen tropischer Hitze und Gletschereis.  Natur und Mensch. 1998 5-28
  PubMedGoogle Scholar
• 28 Jacobsen,  W. B. G., and Jacobsen,  N. H. G.. (1989);  Comparison of the pteridophyte floras of Southern and Eastern Africa, with special reference to high-altitude species.  Bull. Jard. Bot. Nat. Belg.. 59 261-317
  PubMedGoogle Scholar
• 29 Johansson,  D.. (1974);  Ecology of vascular epiphytes in West African rain forest.  Acta Phytogeo. Suec.. 59 1-136
  PubMedGoogle Scholar
• 30 Johansson,  D.. (1989) Vascular epiphytism in Africa. Tropical rain forest ecosystems. Lieth, H. and Werger, M. J. A., eds. Amsterdam ·Oxford ·New York ·Tokyo; Elsevier pp. 183-194
  Google Scholar
• 31 Johns,  R. J.. (1991) Pteridophytes of Tropical East Africa. A Preliminary Check-List of the Species. Kew; Royal Botanic Gardens
  Google Scholar
• 32 Kessler,  M.. (1999);  Plant species richness and endemism during natural landslide succession in a perhumid montane forest in the Bolivian Andes.  Ecotropica. 5 123-136
  PubMedGoogle Scholar
• 33 Klötzli,  F.. (1958);  Zur Pflanzensoziologie des Südhanges der alpinen Stufe des Kilimanjaro.  Ber. Geobot. Inst. Rübel. 1957 33-59
  PubMedGoogle Scholar
• 34 Klute,  F.. (1920) Ergebnisse der Forschungen am Kilimanjaro 1912. Berlin
  Google Scholar
• 35 Kornaś,  J.. (1977);  Life-forms and seasonal patterns in the pteridophytes in Zambia.  Acta Soc. Bot. Polon.. 46 (1) 135-149
  PubMedGoogle Scholar
• 36 Kornaś,  J.. (1978);  Fire-resistance in the Pteridophytes of Zambia.  Fern Gaz.. 11 (6) 373-384
  PubMedGoogle Scholar
• 37 Kornaś,  J.. (1979) Distribution and ecology of the pteridophytes in Zambia. Warszawa-Kraków; PWN 207 pp.
  Google Scholar
• 38 Kornaś,  J.. (1985);  Adaptive strategies of African pteridophytes to extreme environments.  Proc. Roy. Soc. Edinb.. 86 B 391-396
  PubMedGoogle Scholar
• 39 Kornaś,  J.. (1993);  The significance of historical factors and ecological preference in the distribution of African pteridophytes.  J. Biogeog.. 20 281-286
  PubMedGoogle Scholar
• 40 Kramer,  K. U.. (1993);  Distribution patterns in major pteridophyte taxa relative to those of angiosperms.  J. Biogeog.. 20 287-291
  PubMedGoogle Scholar
• 41 Kramer,  K. U.,, Schneller,  J. J.,, and Wollenweber,  E.. (1995) Farne und Farnverwandte. Stuttgart; Bau, Systematik, Biologie
  Google Scholar
• 42 Kress,  W. J.. (1986);  The systematic distribution of vascular epiphytes: an update.  Selbyana. 9 2-22
  PubMedGoogle Scholar
• 43 Kürschner,  H.. (1990);  Höhengliederung von epiphytischen Laub- und Lebermoosen in Nord-Borneo (Mt. Kinabalu).  Nova Hedwigia. 51 (1 - 2) 77-86
  PubMedGoogle Scholar
• 44 Lellinger,  D. B.. (1985) The Distribution of Panama's Pteridophytes. The Botany and Natural History of Panama. D'Arcy, W. G. and Correa, A. M. D., eds. Missouri Botanical Garden pp. 43-47
  Google Scholar
• 45 Lovett,  J. C., and Thomas,  D. W.. (1986);  The ecology of pteridophytes in the Mwanihana forest reserve, Tanzania.  Fern Gaz.. 13 (2) 103-107
  PubMedGoogle Scholar
• 46 Lwanga,  J. S.,, Balmford,  A.,, and Badaza,  R.. (1998);  Assessing fern diversity: relative species richness and its environmental correlates in Uganda.  Biodiv. & Conserv.. 7 1387-1398
  PubMedGoogle Scholar
• 47 Mehltreter,  K. V.. (1995);  Species richness and geographical distribution of montane pteridophytes of Costa Rica, Central America.  Feddes Repert.. 106 563-584
  PubMedGoogle Scholar
• 48 Moran,  R. C.. (1995) The importance of mountains to pteridophytes, with emphasis on Neotropical Montane Forests. Biodiversity and Conservation of Neotropical Montane Forest. Churchill et al., eds. The New York Botanical Garden; Proceedings of the Neotropical Montane Forest Biodiversity and Conservation Symposium, 21 - 26. June 1993 pp. 359-362
  Google Scholar
• 49 Moreau,  R. E.. (1936);  A contribution to the ornithology of Kilimanjaro and Mount Meru.  Proc. Zool. Soc. Lond.. 1935 843-891
  PubMedGoogle Scholar
• 50 O'Kting'ati,  A., and Kessy,  J. F.. (1991) The farming system on Mount Kilimanjaro. The Conservation of Mount Kilimanjaro. Newmark, W. D., ed. Gland and Cambridge; IUCN pp. 71-80
  Google Scholar
• 51 Page,  C. N.. (1979) The diversity of ferns. An ecological perspective. The experimental biology of ferns. Dyer, A. F., ed. London; Academic Press pp. 9-56
  Google Scholar
• 52 Parris,  B. S.,, Beaman,  R. S.,, and Beaman,  J. H.. (1992) The Plants of Mount Kinabalu. I. Ferns and Fern Allies. Kew; Royal Botanic Gardens
  Google Scholar
• 53 Pichi Sermolli,  R. E. G.. (1996) Authors of scientific names in pteridophyta. Kew; Royal Botanic Gardens
  Google Scholar
• 54 Pócs,  T.. (1994) The altitudinal distribution of Kilimanjaro bryophytes. Proc. XIII^{th Plenary Meeting AETFAT, Malawi} . Seyani, J. H. and Chikuni, A. C., eds. Zomba, Malawi pp. 797-812
  Google Scholar
• 55 Raunkiaer,  C.. (1905);  Types biologiques pour la géographie botanique.  Overs. Kongel. Danske Vidensk. Selsk. Fort. Medlemmers Arbeider. 1905 (5) 1-91
  PubMedGoogle Scholar
• 56 Richards,  P. W.. (1963);  Ecological notes on West African vegetation, III. The upland forests of Cameroons Mountain.  J. Ecol.. 51 529-554
  PubMedGoogle Scholar
• 57 Salt,  G.. (1951);  The Shira plateau of Kilimanjaro.  Geogr. J.. 117 150-164
  PubMedGoogle Scholar
• 58 Sarmett,  J. D., and Faraji,  S. A.. (1991) The hydrology of Mount Kilimanjaro: an examination of dry season runoff and possible factors leading to its decrease. The Conservation of Mount Kilimanjaro. Newmark, W. D., ed. Gland and Cambridge; IUCN pp. 53-70
  Google Scholar
• 59 Schelpe,  E. A. C. L. E.. (1951);  The pteridophyta of Mount Kenya.  American Fern Journal. 41 (3) 65-79
  PubMedGoogle Scholar
• 60 Schippers,  R. R.. (1993 a);  Pteridophytes of Tanzania with special reference to Pare and Usambara Mountains.  Fern Gaz.. 14 (5) 171-192
  PubMedGoogle Scholar
• 61 Schippers,  R. R.. (1993 b);  Pteridophytes of Tanzania with special reference to Pare and Usambara Mountains (Part 2).  Fern Gaz.. 14 (6) 193-214
  PubMedGoogle Scholar
• 62 Schmitt,  K.. (1991) The Vegetation of the Aberdare National Park Kenya. High mountain research 8,. Innsbruck; Universitätsverlag Wagner
  Google Scholar
• 63 Whittaker,  R. H.. (1972);  Evolution and measurement of species diversity.  Taxon. 21 (2/3) 213-251
  PubMedGoogle Scholar

A. Hemp

Lehrstuhl für Pflanzenphysiologie
Universität Bayreuth

Universitätsstr. 30
95440 Bayreuth
Germany

Email: andreas.hemp@uni-bayreuth.de

Section Editor: H. Rennenberg