. Bonner zoologische Monographien. Zoology. JAHN, BIRD COMMUNITIES OF THE ECUADORIAN CHOCO. FIG. 10. The first two sections of MNT2 in the floodplain of the Rio Santiago at Playa Rica. Left: semi-open country with shrubs, Heliconia stands, and Cecropia trees; the grass cover on the transect path indicates the high light intensity in this part of the transect (section A, marker 50 m, cf. Fig. 8; elev. 66 m, 27 Apr. 97). Right: young successional forest, c. 5 years old (section B, marker 150 m, elev. 66 m, 27 Apr. 97). the high proportion of pioneer species indicated that the area was cultivated
. Bonner zoologische Monographien. Zoology. JAHN, BIRD COMMUNITIES OF THE ECUADORIAN CHOCO. FIG. 10. The first two sections of MNT2 in the floodplain of the Rio Santiago at Playa Rica. Left: semi-open country with shrubs, Heliconia stands, and Cecropia trees; the grass cover on the transect path indicates the high light intensity in this part of the transect (section A, marker 50 m, cf. Fig. 8; elev. 66 m, 27 Apr. 97). Right: young successional forest, c. 5 years old (section B, marker 150 m, elev. 66 m, 27 Apr. 97). the high proportion of pioneer species indicated that the area was cultivated some time ago. The whole area was rich in light gaps, only a few tree stems had diameters >50 cm, and the canopy height varied between 20 and 35 m. Three genera of palms were present: the common 'gualte' Wettinia quinaria, the understory palm Geonoma sp., and a few individuals of 'pambil' Iriartea deltoidea. The most abundant shrub species belonged to the genera Besleria and Miconia. At marker m the transect ascended an elevational difference of c. 10 m on a small slope, and continued on an alluvial terrace (sections C and D). This mostly level area was covered with medium-age to patchily mature forest on terra firme (Fig. 11). According to local people it had not been cultivated for c. 60 years. However, selective logging has had a continuing impact on the forest structure in recent decades. Nevertheless, some large trees with a DBH > 100 cm and heights of about 40 to 50 m remained. The average canopy height was 25 to 35 m. Tree species diversity was higher in this area than in any other section of MNT2 and MNT1. Frequently noted and identifiable species were, in addition to those listed for MNTl, uva Pourouma minor (Mo- raceae), and arrayän Eugenia myrobalana (Myrta- ceae). The occurrence of a young individual of the valuable hardwood 'guayacan Minquartia guianensis (Olacaceae) shows that this forest still contained species that tend to disappear rapidly under h
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectzoology
