Trade-offs between Reproductive Traits and the Influence of Food Intake during Pregnancy in the Garter Snake, Thamnophis elegans

1998 ◽  
Vol 151 (5) ◽  
pp. 477 ◽  
Author(s):  
Gregory ◽  
Skebo
Keyword(s):  
Food Intake ◽  
Reproductive Traits ◽  
Garter Snake ◽  
Trade Offs ◽  
Influence Of Food ◽  
Thamnophis Elegans

Effects of progesterone and estrogen on the histology of the oviduct of the garter snake, Thamnophis elegans

1981 ◽  
Vol 45 (3) ◽  
pp. 345-354 ◽  
Author(s):  
Rodney A. Mead ◽  
Victor P. Eroschenko ◽  
Dick R. Highfill
Keyword(s):  
Garter Snake ◽  
Thamnophis Elegans

scholarly journals Multiple biological mechanisms result in correlations between pre- and post-mating traits that differ among versus within individuals and genotypes

2018 ◽  
Vol 285 (1885) ◽  
pp. 20180951 ◽  
Author(s):  
Cristina Tuni ◽  
Chang S. Han ◽  
Niels J. Dingemanse
Keyword(s):  
Empirical Studies ◽  
Genetic Correlations ◽  
Reproductive Traits ◽  
Fertilization Success ◽  
Male Quality ◽  
Biological Mechanisms ◽  
Environmental Correlations ◽  
Ejaculate Size ◽  
Trade Offs ◽  
The Hierarchical Structure

Reproductive traits involved in mate acquisition (pre-mating traits) are predicted to covary with those involved in fertilization success (post-mating traits). Variation in male quality may give rise to positive, and resource allocation trade-offs to negative, covariances between pre- and post-mating traits. Empirical studies have yielded mixed results. Progress is hampered as researchers often fail to appreciate that mentioned biological mechanisms can act simultaneously but at different hierarchical levels of biological variation: genetic correlations may, for example, be negative due to genetic trade-offs but environmental correlations may instead be positive due to individual variation in resource acquisition. We measured pre-mating (aggression, body weight) and post-mating (ejaculate size) reproductive traits in a pedigreed population of southern field crickets ( Gryllus bimaculatus ). To create environmental variation, crickets were raised on either a low or a high nymphal density treatment. We estimated genetic and environmental sources of correlations between pre- and post-mating traits. We found positive genetic correlations between pre- and post-mating traits, implying the existence of genetic variation in male quality. Over repeated trials of the same individual (testing order), positive changes in one trait were matched with negative changes in other traits, suggesting energy allocating trade-offs within individuals among days. These findings demonstrate the need for research on pre- and post-mating traits to consider the hierarchical structure of trait correlations. Only by doing so was our study able to conclude that multiple mechanisms jointly shape phenotypic associations between pre- and post-mating traits in crickets.

scholarly journals The Influence of Food During Food intake on Mouth Opening and Head Movement.

2001 ◽  
Vol 8 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Michiyo Takemasa ◽  
Shoji Kohno ◽  
Yoshiaki Arai ◽  
Koji Sawada ◽  
Masataka Ogasawara ◽  
...  
Keyword(s):  
Food Intake ◽  
Head Movement ◽  
Mouth Opening ◽  
Influence Of Food

scholarly journals Gestational diabetes: influence of food intake on birth weight, HBA1, and maternal weight gain

1997 ◽  
Vol 37 (3) ◽  
pp. 372-373
Author(s):  
MC Nuttens ◽  
O. Verier-Mine ◽  
S. Biausque ◽  
A. Wambergue ◽  
M. Romon
Keyword(s):  
Weight Gain ◽  
Birth Weight ◽  
Food Intake ◽  
Gestational Diabetes ◽  
Maternal Weight Gain ◽  
Maternal Weight ◽  
Influence Of Food
Sign in / Sign up

Export Citation Format

Share Document