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opencc-by-4.0Aug 2019View details →

Figs 3, 4 in Morphological sexual maturity of the freshwater anomuran crab Aegla parana (Crustacea, Decapoda, Aeglidae) from Negro River Sub-basin, Upper Iguaçu Basin, southern Brazil

Figs 3, 4. Relationship between the size at the onset of the morphological sexual maturity and the maximum carapace length reached by males (Fig. 3) and females (Fig. 4) of the Aegla species. References: A. franca - BUENO & SHIMIZU (2009), A. platensis - OLIVEIRA & SANTOS (2011), A. manuniflata - TREVISAN & SANTOS (2012), A. georginae - COPATTI et al. (2015), A. castro – TAKANO et al. (2016), A. marginata - ADAM et al. (2018), Aegla parana – present study.

Fig. 2 in Predicting size at first sexual maturity from length/weight relationship: a case study with an Amazonian catfish

Fig. 2. Length/weight relationship of male Auchenipterichthys longimanus. A and C represent Huxley regular length/weight relationship and its distribution of proportional residuals. B and D represent polyphasic length/weight relationship its and distribution of proportional residuals.

Fig. 1 in Predicting size at first sexual maturity from length/weight relationship: a case study with an Amazonian catfish

Fig. 1. Sampling area in the National Forest of Caxiuanã, Pará State, showing the rivers where the fish were collected; Curuá River - Ferreira Penna Research Station (ECFPn), Caxiuanã River; Puraquequara River and Caquajó River. A single point on the map may represent more than one colleting site.

Fig. 4 in Predicting size at first sexual maturity from length/weight relationship: a case study with an Amazonian catfish

Fig. 4. Frequency of mature individuals as a function of the total length. Female sexual maturity identified by visual inspection of ovarian (A) and G SI values (B). Male sexual maturity identified by visual inspection of testes (C) and G SI values (D).

Fig. 3 in Predicting size at first sexual maturity from length/weight relationship: a case study with an Amazonian catfish

Fig. 3. Length/weight relationship of female Auchenipterichthys longimanus. A and C represent Huxley regular length/ weight relationship and its distribution of proportional residuals. B and D represent polyphasic length/weight relationship its and distribution of proportional residuals.

openother-openDec 2021View details →

zenodo36/100

Host cell maturation modulates parasite invasion and sexual differentiation in Plasmodium.

Raw expression counts data is provided along with code needed to analyse the scRNA-seq data presented in the publication "Host cell maturation modulates parasite invasion and sexual differentiation in Plasmodium."

opencc-zeroJul 2021View details →

Polygenic and major-locus contributions to sexual maturation timing in Atlantic salmon

Sexual maturation timing is a life-history trait central to the balance between mortality and reproduction. Maturation may be triggered when an underlying compound trait, called liability, exceeds a threshold. In many different species and especially fishes, this liability is approximated by growth and body condition. However, environmental vs. genetic contributions either directly or via growth and body condition to maturation timing remain unclear. Uncertainty exists also because the maturation process can reverse this causality and itself affect growth and body condition. In addition, disentangling the contributions of polygenic and major loci can be important. In many fishes, males mature before females, enabling the study of associations between male maturation and maturation-unbiased female liability traits. Using 40 Atlantic salmon families, longitudinal common-garden experimentation, and quantitative genetic analyses, we disentangled environmental from polygenic and major locus (vgll3) effects on male maturation, and sex-specific growth and condition. We detected polygenic heritabilities for maturation, growth, and body condition, and vgll3 effects on maturation and body condition but not on growth. Longitudinal patterns for sex-specific phenotypic liability, and for genetic variances and correlations between sexes suggested that early growth and condition indeed positively affected maturation initiation. However, towards spawning time, causality appeared reversed for males whereby maturation affected growth negatively and condition positively via both the environmental and genetic effects. Altogether, the results indicate that growth and condition are useful traits to study liability for maturation initiation, but only until maturation alters their expression, and that vgll3 contributes to maturation initiation via condition.

opencc-zeroOct 2022View details →

Novel husbandry practices result in rapid rates of growth and sexual maturation without impacting adult behavior in the blind Mexican cavefish

The development of animal model systems is dependent on the standardization of husbandry protocols that increase fecundity and reduce generation time. The blind Mexican tetra, Astyanax mexicanus, is an emerging genetic vertebrate model for evolution and biomedical research. Surface and cave populations of A. mexicanus have independently evolved, providing a model system for studying the genetic basis of divergent biological traits. While a rapid increase in the use of A. mexicanus has led to the generation of genetic tools including gene-editing and transgenesis, a slow and inconsistent growth rate remains a major limitation to the expanded application of A. mexicanus. The optimization of husbandry protocols that maximize high-nutrient feed, smaller tank densities, and larger tank sizes across development, would facilitate faster growth and expand the use of this model. Here, we describe standardized husbandry practices that optimize growth through a high-protein diet, increased feeding, growth sorting of larvae and juveniles, and tank size transitions based on standard length. These changes to husbandry had a significant effect on growth rates and decreased the age of sexual maturity in comparison to our previous protocols. To determine whether our nutritional change and increased feeding impacted behavior, we tested fish in exploration and schooling assays. We found that a change in diet had no effect on the behaviors we tested, suggesting that increased feeding and rapid growth will not impact the natural variation in behavioral traits. Taken together, this standardized husbandry protocol will accelerate the development of A. mexicanus as a genetic model.

publicAug 2025View details →

Juvenile hormone regulates the maturation of sexually dimorphic naïve ethanol olfactory preference in Drosophila melanogaster

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publicNov 2022View details →

Novel husbandry practices result in rapid rates of growth and sexual maturation without impacting adult behavior in the blind Mexican cavefish

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publicJul 2021View details →

Polygenic and major-locus contributions to sexual maturation timing in Atlantic salmon

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dryad32/100

Data from: Eversion and withdrawal of an intromittent organ before sexual maturation prepares male beetles for copulation

Some species of criocerine beetles have a hyper-elongated part of the intromittent organ called a flagellum. In resting position, the flagellum is stored in a specialized internal sac in the intromittent organ. This specialized state of the flagellum and internal sac is indispensable during copulation for flagellar insertion into the female spermathecal duct for sperm transfer. However, the morphogenesis of the flagellum does not generate the active state of the flagellum; rather, the flagellum is generated in an inactive and completely coiled state. After eclosion, males of Lema coronata evert and withdraw the internal sac multiple times before sexual maturation, without mounting a female. This behaviour serves to uncoil the flagellum and guide it into the active state with the aid of surface structures on the internal sac. A closely related species, Lema dilecta, also has a long flagellum and undergoes the same behaviour to place the flagellum in the active position. However, some other species of criocerine beetles with much shorter flagella can attain the active state without exhibiting this behaviour. Based on a previously proposed phylogenetic tree, we discuss the evolutionary history of the hyper-elongation of the flagellum and associated behaviour.

opencc-zeroDec 2016View details →

dryad32/100

Data from: Genomic signatures of fine‐scale local selection in Atlantic salmon suggest involvement of sexual maturation, energy homeostasis, and immune defence‐related genes

Elucidating the genetic basis of adaptation to the local environment can improve our understanding of how the diversity of life has evolved. In this study we used a dense SNP array to identify candidate loci potentially underlying fine-scale local adaptation within a large Atlantic salmon (Salmo salar) population. By combining outlier, gene–environment association, and haplotype homozygosity analyses, we identified multiple regions of the genome with strong evidence for diversifying selection. Several of these candidate regions had previously been identified in other studies, demonstrating that the same loci could be adaptively important in Atlantic salmon at sub-drainage, regional and continental scales. Notably, we identified signals consistent with local selection around genes associated with variation in sexual maturation, energy homeostasis, and immune defence. These included the large-effect age-at-maturity gene vgll3, the known obesity gene mc4r, and major histocompatibility complex II. Most strikingly, we confirmed a genomic region on Ssa09 that was extremely differentiated among subpopulations, and that is also a candidate for local selection over the global range of Atlantic salmon. This region co-localized with a haplotype strongly associated with spawning ecotype in sockeye salmon (Oncorhynchus nerka), with circumstantial evidence that the same gene (six6) may be the selective target in both cases. The phenotypic effect of this region in Atlantic salmon remains cryptic, although allelic variation is related to upstream catchment area and co-varies with timing of the return spawning migration. Our results further inform management of Atlantic salmon and open multiple avenues for future research.

opencc-zeroDec 2017View details →

FIG. 7 in Oostegite development during the sexual maturation of females of Tmetonyx similis (G. O. Sars, 1891) (Amphipoda, Lysianassidae)

FIG. 7. Tmetonyx similis female: the spreading of the induction process (arrows) from a single induction centre in segment 3. The predicted subsequent stages in the arrival and development of the oostegites are based on the observation data on Tmetonyx similis female. Stages A and B are generally merged. Cx, coxa; Segt, segment.

FIG. 6 in Oostegite development during the sexual maturation of females of Tmetonyx similis (G. O. Sars, 1891) (Amphipoda, Lysianassidae)

FIG. 6. Distribution of the setae on the oostegites at St 5C (right coxae). (A) Oostegite on coxa 3. The setae are mainly on the distal part of the oostegite. (B) Oostegite on coxa 2. The setae are on the distal part and on the internal side of the oostegite.

FIG. 1 in Oostegite development during the sexual maturation of females of Tmetonyx similis (G. O. Sars, 1891) (Amphipoda, Lysianassidae)

FIG. 1. Stages of development of the oostegites on coxae 2–5 in a Tmetonyx similis female. The sequence of the coxae is arbitrary, depending on the spreading of the induction process. The arrows indicate the 'bud' at St 2(-). PL, pigmented line on coxa 5; oost, oostegite; scale 1 gives St 2(-); scale 2 gives St 4 and St 4A; scale 3 gives St 2, St 2A, St 3 and St 3A. Scale bars: 1 mm.

FIG. 2 in Oostegite development during the sexual maturation of females of Tmetonyx similis (G. O. Sars, 1891) (Amphipoda, Lysianassidae)

FIG. 2. St 2(-) on a right pereopod 4. (A) General view of the bud on coxa 4 (arrow) (the gill was separated); (B) enlargement of the bud.

FIG. 4 in Oostegite development during the sexual maturation of females of Tmetonyx similis (G. O. Sars, 1891) (Amphipoda, Lysianassidae)

FIG. 4. Organization of a seta (oostegite on a right coxa 2). (A) general view. Note the cone at the base of the seta (arrow). (B) Enlargement of the distal part of the seta with the longitudinal rows of digitations. (C) Distal part of the seta. Note the presence of a pore (arrow).

FIG. 3 in Oostegite development during the sexual maturation of females of Tmetonyx similis (G. O. Sars, 1891) (Amphipoda, Lysianassidae)

FIG. 3. (A, B) Development of the setae (oostegite St 3A on a left coxa 3). (A) Distal part of the oostegite with a depression containing a small seta; (B) enlargement of the small seta. (C–F) Setae on the distal part of the oostegite (St 4A on a right coxa 5) (C) Distal part of the oostegite with the setae; (D) enlargement of the right side of the previous oostegite, showing the seta with a swollen base; (E) enlargement of left side of the previous oostegite, setae at a different stage of development; (F) development of a cone at the base of the seta on the distal part of the oostegite on a right coxa 4.