. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. BlOGEOGRAPHY OF ToDIROSTRUM • FttZpaMck 457. Figure 11. Distributions of the five populations in the "brown" Idioptilon species group, showing known collecting localities for each species. All but granadense are extremely rare, relict species. The upper sub- tropical altitudinal range of granadense (2200-2600 m in central Peru) differs from all other Idioptilon species, and appears to be a response to the radiation of assemblages of lowland competitors which has driven the remaining members of this species g
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. BlOGEOGRAPHY OF ToDIROSTRUM • FttZpaMck 457. Figure 11. Distributions of the five populations in the "brown" Idioptilon species group, showing known collecting localities for each species. All but granadense are extremely rare, relict species. The upper sub- tropical altitudinal range of granadense (2200-2600 m in central Peru) differs from all other Idioptilon species, and appears to be a response to the radiation of assemblages of lowland competitors which has driven the remaining members of this species group close to extinction. Small dots — granadense- large dots = rufigulare; squares = mirandae superspecies (closed = mirandae, open = kaemferi); triangles = "Ceratotriccus" (Idioptilon) furcatus. and Weske, 1975). It remains an upper cloud forest inhabitant throughout its range, however, and this habitat is shared by no other close relative. Distribution and morphologic divergence in the brown Idioptilon species group ap- pear analogous to those characterizing the capitale lineage in Todirostrum. Members of both groups show relict distributions or divergent characters, or both, compared with the other members of their respective genera. As in the capitale group, the five brown Idioptilon species apparently com- prise an early phylogenetic divergence from the ancestral lineage. Four members have been fragmented or compressed into re- stricted distributions within the forested tropics and subtropics. The fifth was secondarily forced up into an altitudinal zone that remains unique to the genus. As discussed in the next section, the pres- sures forcing these early species into their relict conditions apparently resulted from the continued production of new, competi- tively superior relatives within the tropical forests. The remaining members of the genus Idioptilon, together with the monotypic. Please note that these images are extracted from scanned page images that
Size: 1675px × 1492px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
