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We used this approach to compare patterns of morphological integration among the three radiations of rift-lake cichlids.
We also examined pair-wise correlations of these morphological traits between sites within species, the extent of morphological integration among traits, and the ranks of P within sites and species to test the degree to which characteristics of P at geographic range edges may constrain or facilitate evolution.
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P. bipinnata did not show the same pattern of morphological integration found among species, which suggests tight morphological integration of all traits and decoupling of evolution at the levels of polyp (the colonial module sensu stricto) vs. branch/internode (an emergent modular feature produced by colonial growth) [ 3].
Morphological integration occurs when there is "cohesion among traits", and when the integration among anatomical landmarks is high their positions will covary strongly [23], [24].
While size remains an important factor influencing morphological integration in marsupials, the relationships among phylogeny, diet, and similarity of integration are quite different than those observed in placentals.
Morphological integration refers to the relationships and connections among morphological elements, and is empirically recognized by detecting the existence of discrete groups of highly correlated traits, termed modules.
Detailed studies have also demonstrated a significant correlation between developmental relationships among structures and adult morphological integration.
The first pairs of PLS axis 1 between the alveolar region and the ascending ramus explained only 54.7% (P < 0.0001) of the total covariation, indicating a moderate level of morphological integration between these modules and a different covariance pattern among the IRCSs.
Theoretical and empirical evidence suggest that such changes in morphological integration – which necessarily involve changes in patterns of genetic covariance among traits – would require long time scales (e.g., millions of generations [ 7, 11, 65]; but see [ 66]).
These levels of morphological integration guarantee a conservative and coordinated response to environmental pressures.
This comparative study of morphological integration in the australodelphian cranium demonstrates that a broad range of patterns exist in the relationships among phylogeny and similarity in integration, but that phylogeny is significantly correlated with similarity in integration in most clades.
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