01705naa a2200229 a 450000100080000000500110000800800410001910000160006024501370007626000090021352010300022265000150125265000160126765000220128365300160130565300220132165300240134370000130136770000130138070000170139377300650141015233032023-06-30       1993    bl uuuu     u00u1 u    #d1 aARRIAGA, L.  aAssociation between cacti and nurse perennials in a heterogeneous tropical dry forest in northwestern Mexico.h[electronic resource]  c1993  aAbstract: The Sierra de La Laguna, Baja California Sur harbors the only tropical dry forest of the Peninsula. An inventory of the perennial plants was carried out at the eastern part of this mountain range. Plant spatial distribution was analyzed considering the species composition and vertical stratification of plant clusters in a study plot of 2 500 m2. A plant cluster was defined as a group of at least three individuals with a maximum distance between plants of 1 m. Soil physical-chemical characteristics and soil surface temperatures were compared between shade and sun conditions. The tropical dry forest of Baja California Sur presents a highly aggregated pattern of species distribution. Most of the perennial plants grow clumped, yet not all of the six cactus species recorded were significantly associated with them. Pattern analysis revealed that only Stenocereus thurberii and Ferocactus peninsulae were aggregated and associated to perennial plants. There is no replacement pattern between cacti and perennia  aFerocactus  aStenocereus  aFloresta Tropical  aCape Region  aOrgan pipe cactus  aSpecies interaction1 aMAYA, Y.1 aDIAZ, S.1 aCANCIANO, J.  tJournal of Vegetation Sciencegv. 4, n. 3, p. 349-356, 1993.