TY - JOUR
T1 - Dimorphic development in Streblospio benedicti
T2 - Genetic analysis of morphological differences between larval types
AU - Zakas, Christina
AU - Rockman, Matthew V.
N1 - Publisher Copyright:
© 2014 UBC Press Printed in Spain.
PY - 2014
Y1 - 2014
N2 - The marine polychaete Streblospio benedicti exhibits two distinct larval types, making it a model for the study of developmental evolution. Females produce either large eggs or small ones, which develop into distinct lecithotrophic or planktotrophic larvae with concomitant morphological and life-history differences. Here, we investigate the inheritance of key morphological traits that distinguish the larval types. We used genetic crosses to establish the infuence of maternal and zygotic differences on larval phenotypes. We found a large maternal effect on larval size and the number of larval chaetae, while the number and length of these chaetae were also strongly infuenced by zygotic genotype. Interestingly, the distribution of larval phenotypes produced by these crosses suggests traits intermediate to the two parental types should not be uncommon. Yet, despite gene fow between the types in natural populations, such intermediates are rarely found in nature, suggesting that selection may be maintaining distinct larval modes.
AB - The marine polychaete Streblospio benedicti exhibits two distinct larval types, making it a model for the study of developmental evolution. Females produce either large eggs or small ones, which develop into distinct lecithotrophic or planktotrophic larvae with concomitant morphological and life-history differences. Here, we investigate the inheritance of key morphological traits that distinguish the larval types. We used genetic crosses to establish the infuence of maternal and zygotic differences on larval phenotypes. We found a large maternal effect on larval size and the number of larval chaetae, while the number and length of these chaetae were also strongly infuenced by zygotic genotype. Interestingly, the distribution of larval phenotypes produced by these crosses suggests traits intermediate to the two parental types should not be uncommon. Yet, despite gene fow between the types in natural populations, such intermediates are rarely found in nature, suggesting that selection may be maintaining distinct larval modes.
KW - Life-history evolution
KW - Poecilogony
KW - Quantitative genetics
KW - Streblospio benedicti
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U2 - 10.1387/ijdb.140088mr
DO - 10.1387/ijdb.140088mr
M3 - Article
C2 - 25690973
AN - SCOPUS:84928409986
SN - 0214-6282
VL - 58
SP - 593
EP - 599
JO - International Journal of Developmental Biology
JF - International Journal of Developmental Biology
IS - 6-8
ER -