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400 results for “Gonad”
Figure 7 in Gonads and gametogenesis in Chaetodactylus osmiae (Acariformes: Astigmata: Chaetodactylidae) a parasite of solitary bees
Figure 7 Light micrographs of cross sections through idiosoma of Chaetodactylus osmiaemale at levels as indicated in Figure 6. Outlines of testes are marked. Scale bars: 0.1 mm. Abbreviations: IV – leg IV; asterisk – germarium; a – anal slit; AG – male accessory gland; col – postcolon; DE – ejaculatory duct; OG – opisthonotal gland; LVD – left deferent duct.
Figure 6 in Gonads and gametogenesis in Chaetodactylus osmiae (Acariformes: Astigmata: Chaetodactylidae) a parasite of solitary bees
Figure 6 Light microscopic images of Chaetodactylus osmiaemale. Male in ventral view (A) and the rear part of idiosoma (B). Scale bars:
Figure 4 in Gonads and gametogenesis in Chaetodactylus osmiae (Acariformes: Astigmata: Chaetodactylidae) a parasite of solitary bees
Figure 4 Chaetodactylus osmiaefemale. TEM. (A) Advanced previtellogenic oocyte showing nucleus (n) with nucleolus (nu). The nuclear envelope has concavities in sites rich in pores, with adhering nuage material (asterisk). Mitochondria (m) are grouped around the nucleus. Another oocyte sectioned tangentially (po) is also present. In the stroma cell (SC), an arrow marks a conspicuous ER cisterna. (B) Enlarged fragment of the oocyte marked in (A): note nucleus (n), a Golgi body (Gb), nuage (asterisks) and mitochondria (m). Note the different appearance of nuage material which is not granular as in the nutritive cell and early oocytes (compare with 2B and 3A-B).. (C) A gap between a nutritive
Figure 5 in Gonads and gametogenesis in Chaetodactylus osmiae (Acariformes: Astigmata: Chaetodactylidae) a parasite of solitary bees
Figure 5 Chaetodactylus osmiaefemale. TEM. (A) Vitellogenic oocyte in upper (forward-running) part of oviduct (Od), containing yolk spheres in subsequent stages of development (Y', Y'' and Y''') and lipid droplets (L) surrounded by glycogen. Lamellar vitelline envelope (VE) covers the surface of the oocyte. Inset: Higher magnification of vitelline envelope adhering to oviduct (Od). Vesicle delivering vitelline envelope material from Golgi body is indicated by an arrow. (B) More advanced vitellogenic oocyte covered with thin and homogeneous chorion (Ch) in the upper oviduct (Od). Yolk (Y) spheres of two types, larger and less dense and smaller and more dense, containing cristalline electron-lucid inclusions. Inset: Yolk sphere with electron-lucid inclusions and meandering structure (arrow). Scale bars: A,B – 5 μm, A inset
Figure 2 in Gonads and gametogenesis in Chaetodactylus osmiae (Acariformes: Astigmata: Chaetodactylidae) a parasite of solitary bees
Figure 2 Chaetodactylus osmiaefemale, two aspects (A,B) of nutritive ovarian cell. TEM. Sections through multilobular nucleus (n) containing large nucleoli (nu). Cytoplasm filled with ribosomes also contains lipid droplets (L), many lysosomes (Ly), groups of mitochondria (m) and small vesicular Golgi bodies (Gb). Granular nuage material (asterisk) is usually present in concavities of the nuclear envelope. Scale bars: A –
Figure 3 in Gonads and gametogenesis in Chaetodactylus osmiae (Acariformes: Astigmata: Chaetodactylidae) a parasite of solitary bees
Figure 3 Chaetodactylus osmiaefemale, two aspects (A, B) of the peripheral part of the nutritive ovarian cell. TEM. (A) Nutritive cell (NOC)
Figure 1 in Gonads and gametogenesis in Chaetodactylus osmiae (Acariformes: Astigmata: Chaetodactylidae) a parasite of solitary bees
Figure 1 Light microscopic images of a Chaetodactylus osmiaefemale. Female in dorsal view (A) and the rear part of the idiosoma (B) with marked position of ovaries (OV), nutritive ovarian cells (NOC), spermatheca (receptaculum seminis) (RS) and inseminatory canal (ic). C-F – Semithin cross sections of idiosoma marked approx. at levels on (A). Note the spherical shape of nutritive cells (NOC) and irregular, wrinkled outline of previtellogenic oocytes (po) (C, D). Early vitellogenic oocytes (vo') located in the backward running oviduct are spherical (D, E)
Fig. 2 in Reproductive period, fecundity and histology of gonads of two cheirodontines (Ostariophysi: Characidae) with different reproductive strategies - insemination and external fertilization
Fig. 2. Scanning Electron Micrography of an oocyte of Compsura heterura from an ovary critical-point dried and crushed with a needle on a stub, showing the spermatozoa observed over an oocyte (a), and an amplified image of these spermatozoa (b).
Fig. 6 in Reproductive period, fecundity and histology of gonads of two cheirodontines (Ostariophysi: Characidae) with different reproductive strategies - insemination and external fertilization
Fig. 6. Distribution of the absolute frequencies of the standard lengths of females of Odontostilbe pequira in the first (September/October) and second (January/February) reproductive periods.
Fig. 1 in Reproductive period, fecundity and histology of gonads of two cheirodontines (Ostariophysi: Characidae) with different reproductive strategies - insemination and external fertilization
Fig. 1. Histology of ovaries of Compsura heterura at different stages of maturation: maturing (a, b), mature (c, d) and semispent (e, f). Black arrow - follicular cells, EZ and white arrow - spermatozoa, FV - post-ovulatory follicles, M - micropile, N - nucleus, NU - nucleolus, OR - early primary growth oocytes, PV - Previtellogenic oocytes, V - vitellogenic oocyte, ZR - radiate zone. Magnification 10x (a, e), 20x (b, c), 100x (d, f).
Fig. 3 in Reproductive period, fecundity and histology of gonads of two cheirodontines (Ostariophysi: Characidae) with different reproductive strategies - insemination and external fertilization
Fig. 3. Histology of testis of Compsura heterura (a, c, d) and Odontostilbe pequira (b) at different stages of maturation: immature (a), maturing (b, c, d) mature (e, f). Arrow - cell division, C - spermatocytes, C1 - primary spermatogonia, C2 - secondary spermatogonia, ET - spermatids, EZ - spermatozoa, G - spermatogonia. Magnification 40x (a, c), 100x (b, d), 20x (e, f).
Fig. 7 in Reproductive period, fecundity and histology of gonads of two cheirodontines (Ostariophysi: Characidae) with different reproductive strategies - insemination and external fertilization
Fig. 7. Relation between absolute fecundity and standard length of females of Compsura heterura (a), from rio Ceará- Mirim, RN, and of Odontostilbe pequira (b) from rio Ibicuí- Mirim, RS.
Inclusion of Spirulina sp. (Arthospira) in the feed of Arapaima gigas (Schinz, 1822) broodstocks: effects on gonadal maturation
<p>Dataset containing information on gonadal development from a trial which tested the Inclusion of <em>Spirulina</em><strong> </strong>sp. (<em>Arthospira</em>) in the feed of <em>Arapaima gigas</em> (Schinz, 1822) broodstocks.</p>
Data from: Maternal deposition of hormones and contaminants shape the gonadal transcriptome in American alligators
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Data from: Artificial light at night and warming impact grazing rates and gonad index of the sea urchin Centrostephanus rodgersii
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Data from: Geographic differences in the phenology of gonadal development and moult, but not of egg laying, are genetically based in a small songbird
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Data from: Seasonally sympatric but allochronic: differential expression of hypothalamic genes in a songbird during gonadal development
Allochrony, the mismatch of reproductive schedules, is one mechanism that can mediate sympatric speciation and diversification. In songbirds, the transition into breeding condition and gonadal growth is regulated by the hypothalamic-pituitary-gonadal (HPG) axis at multiple levels. We investigated whether the difference in reproductive timing between two, seasonally sympatric subspecies of dark-eyed juncos (Junco hyemalis) was related to gene expression along the HPG axis. During the sympatric pre-breeding stage, we measured hypothalamic and testicular mRNA expression of candidate genes via qPCR in captive male juncos. For hypothalamic mRNA, we found our earlier breeding subspecies had increased expression of gonadotropin-releasing hormone (GnRH) and decreased expression of androgen receptor, estrogen receptor alpha, and mineralocorticoid receptor (MR). Subspecies did not differ in expression of hypothalamic gonadotropin-inhibitory hormone (GnIH) and glucocorticoid receptor (GR). While our earlier breeding subspecies had higher mRNA expression of testicular GR, subspecies did not differ in testicular luteinizing hormone receptor, follicle-stimulating hormone receptor, or MR mRNA expression levels. Our findings indicate increased GnRH production and decreased hypothalamic sensitivity to sex steroid negative feedback as factors promoting differences in the timing of gonadal recrudescence between recently diverged populations. Differential gene expression along the HPG axis may facilitate species diversification under seasonal sympatry.
Abb. Eucephalobus mucronatus, Weibchen, a: Kopfende, b: Gonade, c: Schwanz in Einige Nematoden Aus Alpinen Böden In Den Hohen Tauern (Österreich)
Abb. Eucephalobus mucronatus, Weibchen, a: Kopfende, b: Gonade, c: Schwanz
Figure 8 in Gonadal development and fecundity of bogue Boops boops (Linnaeus, 1758) (Sparidae) on the central Algerian coast
Figure 8. Sex frequency distribution, based on B. boops size.
Figure 2 in Gonadal development and fecundity of bogue Boops boops (Linnaeus, 1758) (Sparidae) on the central Algerian coast
Figure 2. Monthly change of the sexual maturity stages (%) in B. boops females.
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Allen Brain Atlas
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