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Biogkographie de Madagascar,1996 :397-402 SEASONAL VARIATIONSOF THEAMpHlBIAN C0"UNITIES IN TWO
 

Summary: Biogkographie de Madagascar,1996 :397-402
SEASONAL VARIATIONSOF THEAMpHlBIAN C0"UNITIES IN TWO
RAINFORESTS OFMADAGASCAR 1
Franco ANDREoNE
Muse0 Regionale di Scienze Naturali, Sezione di Zoologia, Via G. Giolitti, 36, IO123 Torino, ITALY -
Parc Botanique et ZoologiquedeTsitnbazaza, Département Faune, BP 4096,Antananarivo 101,
MADAGASCAR
ABSTRACT .-Field surveys in different seasonal periods were carried out onthe amphibians of two
Malagasy protected areas: Ranomafana (National Park)and Andohahela (Strict Nature Reserve, Parce1
1).These rainforestsare featured by Merent climates, the formerby rainy precipitations throughoutthe
year' the latter by rain-dry alternance. The24 amphibians consideredat Ranomafanaare more abundant
during the warmestmonths,showingdifferentreproductivestrategiesandanarrowtemporal-spatial
nichepartitioning.AtAndohahelaonlya few of the 16 speciesconsidered (e.g. Mantidactylus
boulengeri, M. betsileanus) werefound in high concentrations. Some others (e.g. Mantidactylus
lugubris, M microtympanum) were abundant dong streams, or found with very few individuals (e.g.
Plethodontohylabipunctata, Mantidactylus cf. peraccae). As a general rule, in both the studied areas,
the K-oriented species depend closelyonthe microhabitat stability, while the r-oriented speciesare more
adaptable andcanbe foundin relativelyhigh concentrations throughoutthe seasons.
KEY W0RDS.-Madagascar, Amphibians, Rainforests, Seasonal abundance
RESUME .- Desrecherchesontétéconduites sur lesamphibiensdansdeuxairesprotégéesde

  

Source: Andreone, Franco - Zoology Department, Museo Regionale di Scienze Naturali di Torino

 

Collections: Biology and Medicine; Environmental Sciences and Ecology