scholarly journals Molecular genetic, life-history and morphological variation in a coastal warm-temperate sciaenid fish: evidence for an upwelling-driven speciation event

2016 ◽  
Vol 43 (9) ◽  
pp. 1820-1831 ◽  
Author(s):  
Romina Henriques ◽  
Warren M. Potts ◽  
Warwick H. Sauer ◽  
Carmen V. Santos ◽  
Jerraleigh Kruger ◽  
...  
Keyword(s):  
Life History ◽  
Morphological Variation ◽  
Molecular Genetic ◽  
Speciation Event ◽  
Warm Temperate ◽  
Sciaenid Fish

scholarly journals The genomic footprint of sexual conflict

2019 ◽  
Vol 3 (12) ◽  
pp. 1725-1730 ◽  
Author(s):  
Ahmed Sayadi ◽  
Alvaro Martinez Barrio ◽  
Elina Immonen ◽  
Jacques Dainat ◽  
David Berger ◽  
...  
Keyword(s):  
Life History ◽  
Sexual Conflict ◽  
Callosobruchus Maculatus ◽  
Seminal Fluid ◽  
Balancing Selection ◽  
Molecular Genetic ◽  
Purifying Selection ◽  
Phenotypic Selection ◽  
Genomic Signatures ◽  
Seminal Fluid Protein

AbstractGenes with sex-biased expression show a number of unique properties and this has been seen as evidence for conflicting selection pressures in males and females, forming a genetic ‘tug-of-war’ between the sexes. However, we lack studies of taxa where an understanding of conflicting phenotypic selection in the sexes has been linked with studies of genomic signatures of sexual conflict. Here, we provide such a link. We used an insect where sexual conflict is unusually well understood, the seed beetle Callosobruchus maculatus, to test for molecular genetic signals of sexual conflict across genes with varying degrees of sex-bias in expression. We sequenced, assembled and annotated its genome and performed population resequencing of three divergent populations. Sex-biased genes showed increased levels of genetic diversity and bore a remarkably clear footprint of relaxed purifying selection. Yet, segregating genetic variation was also affected by balancing selection in weakly female-biased genes, while male-biased genes showed signs of overall purifying selection. Female-biased genes contributed disproportionally to shared polymorphism across populations, while male-biased genes, male seminal fluid protein genes and sex-linked genes did not. Genes showing genomic signatures consistent with sexual conflict generally matched life-history phenotypes known to experience sexually antagonistic selection in this species. Our results highlight metabolic and reproductive processes, confirming the key role of general life-history traits in sexual conflict.

BIOLOGY OF THE ROSE STEM GALLER DIPLOLEPIS NODULOSA (HYMENOPTERA: CYNIPIDAE) AND ITS ASSOCIATED COMPONENT COMMUNITY IN CENTRAL ONTARIO

1997 ◽  
Vol 129 (6) ◽  
pp. 1121-1140 ◽  
Author(s):  
Scott E. Brooks ◽  
Joseph D. Shorthouse
Keyword(s):  
Life History ◽  
Seasonal Variation ◽  
Morphological Variation ◽  
Related Species ◽  
The Other ◽  
Component Community ◽  
The Rose

AbstractDiplolepis nodulosa (Beutenmüller) induces small, monothalamous, prosoplasmic galls in stem tissues of Rosa blanda Aiton. Adults and galls are redescribed and notes on distribution, host records, morphological variation, and a comparison with related species are presented. Galls are commonly attacked by the inquiline Periclistus pirata (Osten Sacken). Data on life history and mortality of inducers and inquilines, along with seasonal variation in gall density, were obtained from a study site near Sudbury. Ontario, in 1993 and 1994. Inquilines killed 55% of the inducer population in 1993 and 65% in 1994. The abundance and density of galls fluctuated over the 2 years; however, the proportion of galls modified by inquilines remained constant. Six species of parasitoids caused an additional 17% inducer mortality. Aprostocetus sp. was the dominant parasitoid of D. nodulosa, whereas the other five species were incidental. The assemblage of parasitoids associated with galls modified by P. pirata caused 13% inquiline mortality and include seven species, of which Eurytoma spp. and Caenacis sp. were dominant. The unique aspects of the D. nodulosa gall system are discussed.

scholarly journals The Bantam Sunfish, Lepomis Symmetricus

1977 ◽  
Vol 31 (1-10) ◽  
pp. 437-466 ◽  
Author(s):  
Brooks M. Burr
Keyword(s):  
Life History ◽  
Species Distribution ◽  
Morphological Variation ◽  
Museum Specimens ◽  
Southern Illinois ◽  
Life History Study

The bantam sunfish, described as Bohlke; Garrett S. Glodek; Tomio Lepomis symmetricus by Stephen A. Forbes in 1883, is one of the least known species in the genus, probably because of its small size, rarity over parts of its range, occurrence in rather inaccessible swamp habitats, and drab and nondescript appearance. This effort to remedy the gaps in our knowledge of the species reviews all published references to L. symmetricus. To supplement the meager information available, this report includes an analysis of morphological variation based on the study of museum specimens, an assessment of the species' distribution, and a life-history study based on periodic collections made at a study site in southern Illinois.

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