+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Comparative analyses of functional relationships in the evolution of trophic morphology in the map turtles (Emydidae: Graptemys)

, : Comparative analyses of functional relationships in the evolution of trophic morphology in the map turtles (Emydidae: Graptemys). Herpetologica 57(3): 313-318

Variation in relative width of the head and alveolar surfaces of the jaws in map turtles (Graptemys) is associated with the degree of molluscivory in adult females. Adult males are substantially smaller in body size and are primarily insectivorous, and they take few mollusks regardless of their relative head width or alveolar width. We assessed functional relationships within and between the sexes using comparative analyses (independent contrasts and squared-change parsimony) of the residuals of regressions of head width on plastron length and alveolar width on head width. Residuals of head width and alveolar width were significantly correlated within females but not within males in all comparative analyses. Residuals of each regression were significantly correlated between males and females for a subset of analyses. Our results suggest that evolutionary changes in relative head width have been correlated with changes in relative alveolar width in females of Graptemys due to a functional relationship that is related to the tendency to feed on mollusks. Males have exhibited changes in the two characters similar to changes in females over evolutionary time, probably as a result of genetic covariation, but due to males' primarily insectivorous nature, changes in the two characters have not shown significant correlation with one another.


DOI: 10.2307/3893098

Other references

Engel, U.; Engel, H., 1985: Durch Nachzucht erhalten: der Hardun. Aquarien Magazin, 196: 217-219

Knab, F., 1913: Contentions regarding Forest Malaria. In a paper read before the Washington Entomological Society, Dr. Lutz upholds his theory that outbreaks of malaria amongst men working in uninhabited forests in Brazil, far from towns or dwellings, are caused by the bites of Anopheles lutzii (= A....

Diniz, M. de A., 1959: Estado actual do conhecimento dos Himenopteros de Portugal. Memorias e Estudos do Museu Zoologico da Universidade de Coimbra, no. 259: 1-42

Champagne E.; Takihara Y.; Sagman U.; D.S.usa J.; Burrow S.; Lewis W.H.; Mak T.W.; Minden M.D., 1989: The t cell receptor delta chain locus is disrupted in the t all associated 11 14 p13 q11 translocation. Two T-ALL patients carrying a t(11;14)(p13;q11) translocation were analyzed. Southern blotting experiments demonstrated that both patients had rearranged their genes and that the translocation involved the .delta. locus in both cases. In...

Kudela, M., 1972: Contribution to chemical weed control in forest plantations by amitrol. Lesnictvi 18 (12) 1127-1140

Mahmood T.; Ahmad S.S.; Siddiqui S., 1988: Daturilinol a new withanolide from the leaves of datura metel. A withanolide daturillinol (1) has been isolated from the fresh leaves of Datura metel and it structure elucidated through spectral studies.

Rouet, R.; Picard, S.; Libersa, C.; Ghadanfar, M.; Alabaster, C.; Gerard, J.L.uis, 2000: Electrophysiological effects of dofetilide in an in vitro model of border zone between normal and ischemic/reperfused myocardium. Background-To evaluate both class III activity and antiarrhythmic action of dofetilide at the level of the "border zone," we investigated its electrophysiological effects on guinea pig ventricular strips submitted partly to normoxia (nor...

Latimer, K.M.; Mott, T.F., 2016: Lung cancer: diagnosis, treatment principles, and screening. Lung cancer is classified histologically into small cell and non-small cell lung cancers. The most common symptoms of lung cancer are cough, dyspnea, hemoptysis, and systemic symptoms such as weight loss and anorexia. High-risk patients who presen...

Tak, S.H.; Beck, C.; Hong, S.Hee., 2013: Feasibility of providing computer activities for nursing home residents with dementia. Nursing home residents with dementia need cognitively stimulating and enjoyable activities, and computer technology offers them a means of engaging in such activities. This study therefore examined the feasibility of providing a 12-week computer a...

Bobik, A.; Woodcock, E.A.; Johnston, C.I.; Funder, W.J., 1977: The preparation and purification of 3 4 iodophenoxy 1 isopropylamino 2 propanol iodine 125 a beta adrenergic antagonist. The preparation of an I-125 labelled .beta. adrenergic ligand, 3-(4-iodophenoxy)-1-isopropylamino-2-propanol, suitable for .beta.-adrenergic receptor membrane binding studies is described. Several preparations were carried out with radiochemical y...