Do early Paleoindian point blades carry culturally significant shape information? Modules versus complete points using geometric morphometrics

2021 ◽  
Vol 40 ◽  
pp. 103245
Author(s):  
Heather L. Smith ◽  
Thomas A. Jennings ◽  
Ashley M. Smallwood
Keyword(s):  
Geometric Morphometrics ◽  
Shape Information

Phenotypic plasticity of taxonomic and diagnostic structures in gyrodactylosis-causing flatworms (Monogenea, Platyhelminthes)

Parasitology ◽  
2009 ◽  
Vol 136 (11) ◽  
pp. 1305-1315 ◽  
Author(s):  
K. OLSTAD ◽  
L. BACHMANN ◽  
T. A. BAKKE
Keyword(s):  
Phenotypic Plasticity ◽  
Geometric Morphometrics ◽  
Negative Correlation ◽  
Host Species ◽  
Primary Host ◽  
Shape Information ◽  
Size And Shape ◽  
Isogenic Strains

SUMMARYThe present study addresses the effect of varying temperature and host species on the size and shape of the opisthaptoral hard-parts in isogenic strains of Gyrodactylus salaris and G. thymalli. Variation in shape was examined using geometric morphometrics. Since the opisthaptoral hard-parts of Gyrodactylus have few specific landmarks, their shape information mostly being represented by outlines and surfaces, a method based on sliding semi-landmarks was applied. The ventral bars of G. salaris did not follow the previously postulated negative correlation between size and temperature, and the largest hamuli and marginal hooks from G. salaris and the smallest from G. thymalli clearly overlapped in size. Consistent shape differences with temperature were detected for the hard-parts from G. thymalli but not from G. salaris. The hard-parts of G. salaris were similar in size but significantly different in shape when grown on secondary hosts rather than the primary host.

Improvement of Automatic Lip Extraction Process Using Shape Information of Lips

2010 ◽  
Vol 130 (5) ◽  
pp. 873-881 ◽  
Author(s):  
Yoshiyuki Sato ◽  
Junichi Narita ◽  
Yoichi Kageyama ◽  
Makoto Nishida
Keyword(s):  
Extraction Process ◽  
Shape Information

USING GEOMETRIC MORPHOMETRICS TO DISTINGUISH CHAETODIPUS AND PEROGNATHUS (RODENTIA, HETEROMYIDAE)

2019 ◽  
Author(s):  
Megan R. Wyatt ◽  
◽  
Samantha S.B. Hopkins ◽  
Edward Byrd Davis
Keyword(s):  
Geometric Morphometrics

scholarly journals Differences in Tibia Shape in Organically Reared Chicken Lines Measured by Means of Geometric Morphometrics

Animals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 101
Author(s):  
Domitilla Pulcini ◽  
David Meo Zilio ◽  
Francesco Cenci ◽  
Cesare Castellini ◽  
Monica Guarino Amato
Keyword(s):  
Geometric Morphometrics ◽  
Body Weight Gain ◽  
Growth Speed ◽  
Walking Ability ◽  
Static Behavior ◽  
Walking Behavior ◽  
Organic Farm ◽  
Genetic Types ◽  
External Reference ◽  
Slow Growing

In the present study, the conformation of the tibia of seven genetic lines of broilers was analyzed by Geometric Morphometrics and correlated to carcass weight and walking ability. The used chicken genetic lines were classified as fast, medium, or slow growing and ranked for their walking ability. Six chicken types were reared in an organic farm and slaughtered at 81 days of age while one slow-growing and highly walking line (Naked Neck) was reared in a commercial farm and used as external reference for moving activity and growth speed. A mixed landmarks and semi-landmarks model was applied to the study of tibia shape. Results of this study showed that: (i) body weight gain was positively correlated to the curvature of the antero-posterior axis of the tibia; (ii) the shape of the tibia and the active walking behavior were significantly correlated; (iii) walking and not-walking genetic lines could be discriminated in relation to the overall shape of the tibia; (iv) a prevalence of static behavior was correlated to a more pronounced curvature of the antero-posterior axis of the tibia. Results of this study revealed that the walking genetic types have a more functional and natural tibia conformation. This easy morphologic method for evaluating tibia shape could help to characterize the adaptability of genotypes to organic and outdoor rearing.

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