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2,358 results for “juveniles”
Data from: Sex-specific effects of inbreeding in juvenile brown trout
<p>Inbreeding depression, i.e., the reduction of health and vigour in individuals with high inbreeding coefficients, is expected to increase with environmental, social, or physiological stress. It has therefore been predicted that sexual selection and the associated stress usually lead to higher inbreeding depression in males than in females. However, sex-specific differences in life history may reverse that pattern during certain developmental stages. In some salmonids, for example, female juveniles start developing their gonads earlier than males who instead grow faster. We tested whether the sexes are differently affected by inbreeding during that time. To study the effects of inbreeding coefficients that may be typical for natural populations of brown trout (<em>Salmo trutta</em>), and also to control for potentially confounding maternal or paternal effects, we sampled males and females from the wild, used their gametes in a block-wise full-factorial breeding design to produce 60 full-sib families, released the offspring as yolk-sac larvae into the wild, sampled them 6 months later, identified their genetic sex, and used microsatellites to assign them to their parents. We used whole-genome resequencing to calculate the kinship coefficients for each breeding pair and hence the expected average inbreeding coefficient per family. Juvenile growth could be predicted from these expected inbreeding coefficients and the genetic sex: Females reached lower body sizes with increasing inbreeding coefficient, while no such link could be found in males. This sex-specific inbreeding depression led to the overall pattern that females were on average smaller than males by the end of their first summer.</p>
Figure 2. a, coelomic brood juveniles from a in Observations of reproductive strategies for some dendrochirotid holothuroids (Echinodermata: Holothuroidea: Dendrochirotida)
Figure 2. a, coelomic brood juveniles from a female Staurothyone inconspicua (Bell) showing mid-body constrictions and variable sizes (F58613; photo by CR). b, coelomic juvenile of S. inconspicua showing a deep mid-body constriction (F58456; CR). c, coelomic juveniles from a female Parathyonidium Heding species (F84983; CR). d, many small (F58592, late October; CR) and one large (F76371, late December; CR) coelomic brood juveniles of Neoamphicyclus materiae O'Loughlin. e, single large coelomic juvenile of N. materiae (F58606; late December; LA). f, invaginated body wall marsupium of Cladodactyla crocea (Lesson) with single remaining egg/embryo (F106967; 27 mm long; LA).
Figure 15. Juvenile Stage II in Postembryonic development in freshwater crayfish (Decapoda: Astacidea) in an evolutionary context
Figure 15. Juvenile Stage II of Cambaroides japonicus. (A) Habitus, lateral view; (B) eses and rostrum, dorsal view; (C) tail fan, dorsal view; (D) posterior edge of tail fan; (E–I) pereiopods 1–5, dorsal or lateral view; (J–N) distal segments of pereiopods 1–5, dorsal or lateral view. Scale bars: 0.25 mm.
Figure 10. Juvenile Stage II in Postembryonic development in freshwater crayfish (Decapoda: Astacidea) in an evolutionary context
Figure 10. Juvenile Stage II of Procambarus virginalis. (A) Antenna 1, dorsal view; (B) antennal scale, dorsal view; (C) flagellum of antenna 2, dorsal view; (D) mandible, view of inside of mouth; (E) maxilla 1, oral view; (F) maxilla 2, oral view; (G) first maxilliped, oral view; (H) second maxilliped, oral view; (I) third maxilliped, oral view; (J) pleopod. Scale bar: 0.25 mm.
Figure 9. Juvenile Stage II in Postembryonic development in freshwater crayfish (Decapoda: Astacidea) in an evolutionary context
Figure 9. Juvenile Stage II of Procambarus virginalis. (A) Habitus, lateral view; (B) eses and rostrum, dorsal view; (C) tail fan, dorsal view; (D–H) pereiopods 1–5, dorsal or lateral view; (I–M) distal segments of pereiopods 1–5, dorsal or lateral view. Scale bars: 0.25 mm.
Figure 16. Juvenile Stage II in Postembryonic development in freshwater crayfish (Decapoda: Astacidea) in an evolutionary context
Figure 16. Juvenile Stage II of Cambaroides japonicus. (A) Antenna 1, dorsal view; (B) antennal scale, dorsal view; (C) antenna 2, dorsal view; (D) mandible, view of inside of mouth; (E) maxilla 1, oral view; (F) maxilla 2, oral view; (G) first maxilliped, oral view; (H) second maxilliped, oral view; (I) third maxilliped, oral view; (J) pleopod. Scale bars: 0.25 mm.
Figure 13. Juvenile Stage I in Postembryonic development in freshwater crayfish (Decapoda: Astacidea) in an evolutionary context
Figure 13. Juvenile Stage I of Cambaroides japonicus. (A) Habitus, lateral view; (B) eses and rostrum, dorsal view; (C) tail fan and telson thread, dorsal view; (D) posterior edge of the telson and telson thread; (E–I), pereiopods 1–5, dorsal or lateral view; (J–N) distal segments of pereiopods 1–5, dorsal or lateral view. Scale bars: 0.25 mm.
Figure 7. Juvenile Stage I in Postembryonic development in freshwater crayfish (Decapoda: Astacidea) in an evolutionary context
Figure 7. Juvenile Stage I of Procambarus virginalis. (A) Habitus, lateral view; (B) eses and rostrum, dorsal view; (C) tail fan and telson thread, dorsal view; (D) posterior edge of the tail fan and telson thread; (E–I), pereiopods 1–5, dorsal or lateral view; (J–N) distal segments of pereiopods 1–5, dorsal or lateral view. Scale bars: 0.25 mm.
F I G U R E 2 in Effects of dietary hydrolysate supplementation on growth, body composition, hematological responses, and liver histology of juvenile giant trevally (Caranx ignobilis Forsskal, 1775)
F I G U R E 2 Somatic indexes and condition factor of giant trevally fed experimental diets for 8 weeks. ns, nonsignificant. Different subscript letters indicate differences among treatments.
F I G U R E 1 in Effects of dietary hydrolysate supplementation on growth, body composition, hematological responses, and liver histology of juvenile giant trevally (Caranx ignobilis Forsskal, 1775)
F I G U R E 1 The quadratic regression for the specific growth rate (SGR) of juvenile giant trevally and dietary fish protein hydrolysate (FPH) supplementation. SH, shrimp hydrolysate; TH, tuna hydrolysate.
F I G U R E 5 in Effects of dietary hydrolysate supplementation on growth, body composition, hematological responses, and liver histology of juvenile giant trevally (Caranx ignobilis Forsskal, 1775)
F I G U R E 5 Liver microscopy of giant trevally fed fish protein hydrolysate (FPH) for 8 weeks (scale bar = 50 μm, 400 magnification). Stained with hematoxylin and eosin.
F I G U R E 3 in Effects of dietary hydrolysate supplementation on growth, body composition, hematological responses, and liver histology of juvenile giant trevally (Caranx ignobilis Forsskal, 1775)
F I G U R E 3 Proximate composition in the whole body of juvenile giant trevally fed tested diets for 8 weeks. ns, non-significant. Different subscript letters indicate differences among treatments.
F I G U R E 4 in Effects of dietary hydrolysate supplementation on growth, body composition, hematological responses, and liver histology of juvenile giant trevally (Caranx ignobilis Forsskal, 1775)
F I G U R E 4 Hematological and serum biochemical parameters of giant trevally fed experimental diets for 8 weeks. ns, non-significant. Different subscript letters indicate differences among treatments.
F I G U R E 2 in Movement and habitat shift responses of juvenile Atlantic Salmon (Salmo salar) to annually permanent stream flooding
F I G U R E 2 Mahers River study reach, Newfoundland, showing the habitat conditions before (riffle run) and after (pool) annual flooding.
F I G U R E 1 in Movement and habitat shift responses of juvenile Atlantic Salmon (Salmo salar) to annually permanent stream flooding
F I G U R E 1 Mahers River and North Arm River, Newfoundland, Canada. The seasonally created pool (Flooded Pool reach) is located within Mahers River. Two control reaches were located in Mahers River; one immediately upriver of the created pool habitat (Riffle Above Pool reach) and another approximate 3 km upstream (Mahers Control reach) and two additional control reaches were located in the nearby North Arm River (North Arm 1 and 2).
FIGURE 5 in Insights into vertebral band pair deposition rate in the juvenile common thresher shark (Alopias vulpinus) in the northeastern Pacific Ocean
FIGURE 5 Number of vertebral band pairs after the oxytetracycline mark compared to days at liberty for Alopias vulpinus at liberty ≥1 year, tagged and recaptured in the northeastern Pacific Ocean (1998–2013) n = 14. The dashed lines represent the relationship of band pairs to days at liberty; the dotted line represents a 1:1 deposition rate of one band pair per year.
FIGURE 5 in Population ecology and juvenile density hotspots of thornback ray (Raja clavata) around the Shetland Islands, Scotland
FIGURE 5 Spatial distribution of juvenile Raja clavata (<60 cm) catch per unit effort (CPUE) from annual Shetland inshore fish surveys (SIFS) conducted between 2017 and 2022. Blue crosses indicate inshore habitat surveys (20–50 m water depth), and red crosses indicate shallow water habitat surveys (50–150 m water depth). The size of circle indicates CPUE. The location of each R. clavata individual was assigned as the midpoint of the associated tow.
FIGURE 2 in Population ecology and juvenile density hotspots of thornback ray (Raja clavata) around the Shetland Islands, Scotland
FIGURE 2 Catch per unit effort (CPUE) of Raja clavata for the shallow (red) (2017–2022) and inshore (blue) (2011–2022) survey locations. The mean result is shown by solid lines, and the shaded area represents the variability between tows (standard error).
FIGURE 1 in Population ecology and juvenile density hotspots of thornback ray (Raja clavata) around the Shetland Islands, Scotland
FIGURE 1 Inshore (blue) and shallow (red) survey tow habitats during Shetland Inshore Fish Survey. Tows identified by their station code and corresponding fishing grounds, for example, HA01, Fitful Head.
FIGURE 4 in Population ecology and juvenile density hotspots of thornback ray (Raja clavata) around the Shetland Islands, Scotland
FIGURE 4 Non-metric multidimensional scaling (nMDS) plot showing ordinations generated from a Bray–Curtis similarity matrix on Raja clavata catch per unit effort (CPUE) Bray-Curtis similarities between shallow water and inshore habitat tow locations. Surveys are grouped into shallow (red) and inshore (blue) habitats. Labels represent survey habitat and year, for example, I22 = Inshore survey conducted in 2022. nMDS plot 2D stress is 0.06, indicating a clear distinction of the two clusters (dashed lines). Inset picture shows two Raja clavata sampled in a tow; basket diameter at base is 35 cm.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
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OpenNeuro
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