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Title: Phylogenetic Relationships and Adaptive Shifts among Major Clades of Tetragnatha Spiders (Araneae: Tetragnathidae) in Hawai'i 
Author: Gillespie, Rosemary G.; Croom, Henrietta B.; Hasty, G.L.
Date: 1997-10
Publisher: University of Hawaii Press
Citation: Gillespie RG, Croom HB, Hasty GL. 1997. Phylogenetic relationships and adaptive shifts among major clades of Tetragnatha spiders (Araneae: Tetragnathidae) in Hawai'i. Pac Sci 51(4): 380-394.
Abstract: The role of adaptive shifts in species formation has been the subject
of considerable controversy for many years. Here we examine the phylogeny of a
large radiation of Hawaiian spiders in the genus Tetragnatha to determine the extent
to which species splitting is associated with shifts in ecological affinity. We use
molecular data from ribosomal 12S and cytochrome oxidase mitochondrial DNA,
and allozymes to assess phylogenetic affinity. Ecological associations were recorded
for all species under study, and shifts are considered in the context of the phylogeny.
Results indicate that there are two major clades of Hawaiian Tetragnatha, one of
which has abandoned web building (spiny-leg clade), while the other retains the
ancestral condition of web building. Within the spiny-leg clade, the molecular
information suggests that the species on anyone island are generally most closely
related to each other. Preliminary results for the web-building "complex" of species
indicate that there may be groups of web builders that have speciated in a similar
manner. Results of the study suggest that, at least within the spiny-leg clade, matching
sets of taxa have evolved independently on the different Hawaiian islands. There
appears to have been a one-to-one convergence of the same set of "ecomorph" types
on each island in a manner similar to that of lizards of the Caribbean.
ISSN: 0030-8870

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