Occurrence of mature male white-spotted charr (Salvelinus leucomaenis) in spring, an unusual season

Thirty-three mature male Holtzman rats were randomly placed in 3 treatment groups: Controls (C); Ethanolics (E); and Wine drinkers (W). The animals were fed synthetic diets (Lieber type) with ethanol or wine substituted isocalorically for carbohydrates in the diet of E and W groups, respectively. W received a volume of wine which provided the same gram quantity of alcohol consumed by E. The animals were sacrificed by decapitation after 6 weeks and the livers processed for quantitative triglycerides (T3), proteins, malic enzyme activity (MEA), light microscopy (LM) and electron microscopy (EM). Morphometric analysis of randomly selected LM and EM micrographs was performed to determine organellar changes in centrilobular (CV) and periportal (PV) regions of the liver. This analysis (Table 1) showed that hepatocytes from E were larger than those in C and W groups. Smooth endoplasmic reticulum decreased in E and increased in W compared to C values.

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Proceedings: Increased androgen production following irradiation of oestrogen-treated mature male fish, Heteropneustes fossilis (Bloch)

Reproduction ◽

10.1530/jrf.0.0380240 ◽

1974 ◽

Vol 38 (1) ◽

pp. 240-241

Author(s):

S. Rathi

Keyword(s):

Mature Male ◽

Heteropneustes Fossilis ◽

Male Fish

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The first report of albinism in a Sundaland endemic rodent

Mammalia ◽

10.1515/mammalia-2020-0047 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Jonathan A. Nations ◽

Ahmad Mursyid ◽

Ryski Darma Busta ◽

Sah Putra Adrian ◽

Heru Handika ◽

...

Keyword(s):

Southeast Asia ◽

Mature Male ◽

Congenital Disorder ◽

Domesticated Animals ◽

First Report ◽

West Sumatra ◽

Sexually Mature

AbstractAlbinism, a congenital disorder that results in a lack of melanin deposition, is common in domesticated animals but rare in nature. Among the ∼2500 species of rodents worldwide, only 67 have published reports of albinism. Here we report the capture of an albino murid (Muridae: Rodentia) from Mt. Singgalang in West Sumatra, Indonesia. The specimen is an adolescent but sexually mature male Maxomys hylomyoides, a montane Sumatran endemic. To our knowledge, this specimen represents the first reported albino rodent from Indonesia and Sundaland, and only the second from Southeast Asia.

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Lymphocytic Choriomeningitis Virus Alters the Expression of Male Mouse Scent Proteins

Viruses ◽

10.3390/v13061180 ◽

2021 ◽

Vol 13 (6) ◽

pp. 1180

Author(s):

Michael B. A. Oldstone ◽

Brian C. Ware ◽

Amanda Davidson ◽

Mark C. Prescott ◽

Robert J. Beynon ◽

...

Keyword(s):

Mate Selection ◽

Lymphocytic Choriomeningitis ◽

T Cell Response ◽

Mature Male ◽

Cytotoxic T Cell ◽

Scent Marks ◽

High Concentration ◽

Embryo Survival ◽

Major Urinary Proteins ◽

The Individual

Mature male mice produce a particularly high concentration of major urinary proteins (MUPs) in their scent marks that provide identity and status information to conspecifics. Darcin (MUP20) is inherently attractive to females and, by inducing rapid associative learning, leads to specific attraction to the individual male’s odour and location. Other polymorphic central MUPs, produced at much higher abundance, bind volatile ligands that are slowly released from a male’s scent marks, forming the male’s individual odour that females learn. Here, we show that infection of C57BL/6 males with LCMV WE variants (v2.2 or v54) alters MUP expression according to a male’s infection status and ability to clear the virus. MUP output is substantially reduced during acute adult infection with LCMV WE v2.2 and when males are persistently infected with LCMV WE v2.2 or v54. Infection differentially alters expression of darcin and, particularly, suppresses expression of a male’s central MUP signature. However, following clearance of acute v2.2 infection through a robust virus-specific CD8 cytotoxic T cell response that leads to immunity to the virus, males regain their normal mature male MUP pattern and exhibit enhanced MUP output by 30 days post-infection relative to uninfected controls. We discuss the likely impact of these changes in male MUP signals on female attraction and mate selection. As LCMV infection during pregnancy can substantially reduce embryo survival and lead to lifelong infection in surviving offspring, we speculate that females use LCMV-induced changes in MUP expression both to avoid direct infection from a male and to select mates able to develop immunity to local variants that will be inherited by their offspring.

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Immunocytochemical detection of prolactin or prolactin-like immunoreactivity in epididymis of mature male mouse

Histochemistry ◽

10.1007/bf00266392 ◽

1990 ◽

Vol 93 (3) ◽

Cited By ~ 4

Author(s):

W.B. Brumlow ◽

C.S. Adams

Keyword(s):

Male Mouse ◽

Mature Male ◽

Immunocytochemical Detection

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Role of Ca2+ in the IVM of spermatozoa from the sterlet Acipenser ruthenus

Reproduction Fertility and Development ◽

10.1071/rd16145 ◽

2017 ◽

Vol 29 (7) ◽

pp. 1319 ◽

Cited By ~ 4

Author(s):

Olga Bondarenko ◽

Borys Dzyuba ◽

Marek Rodina ◽

Jacky Cosson

Keyword(s):

Sperm Motility ◽

Seminal Fluid ◽

Mature Male ◽

Sperm Maturation ◽

Wolffian Duct ◽

Testicular Spermatozoa ◽

Acipenser Ruthenus ◽

Sterlet Acipenser Ruthenus ◽

Motility Parameters

The role of Ca2+ in sturgeon sperm maturation and motility was investigated. Sperm from mature male sterlets (Acipenser ruthenus) were collected from the Wolffian duct and testis 24 h after hormone induction. Testicular spermatozoa (TS) were incubated in Wolffian duct seminal fluid (WDSF) for 5 min at 20°C and were designated ‘TS after IVM’ (TSM). Sperm motility was activated in media with different ion compositions, with motility parameters analysed from standard video microscopy records. To investigate the role of calcium transport in the IVM process, IVM was performed (5 min at 20°C) in the presence of 2 mM EGTA, 100 µM Verapamil or 100 µM Tetracaine. No motility was observed in the case of TS (10 mM Tris, 25 mM NaCl, 50 mM Sucr with or without the addition of 2 mM EGTA). Both incubation of TS in WDSF and supplementation of the activation medium with Ca2+ led to sperm motility. The minimal Ca2+ concentration required for motility activation of Wolffian duct spermatozoa, TS and TSM was determined (1–2 nM for Wolffian duct spermatozoa and TSM; approximately 0.6 mM for TS). Motility was obtained after the addition of verapamil to the incubation medium during IVM, whereas the addition of EGTA completely suppressed motility, implying Ca2+ involvement in sturgeon sperm maturation. Further studies into the roles of Ca2+ transport in sturgeon sperm maturation and motility are required.

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Estrogenic influences of estradiol-17b, p-nonylphenol and bis-phenol-A on Japanese Medaka (Oryzias latipes) at detected environmental concentrations

Water Science & Technology ◽

10.2166/wst.2001.0079 ◽

2001 ◽

Vol 43 (2) ◽

pp. 109-116 ◽

Cited By ~ 95

Author(s):

A. Tabata ◽

S. Kashiwada ◽

Y. Ohnishi ◽

H. Ishikawa ◽

N. Miyamoto ◽

...

Keyword(s):

River Water ◽

Lethal Effect ◽

Mature Male ◽

Japanese Medaka ◽

Aquatic Environments ◽

Environmental Estrogen ◽

Environmental Concentrations ◽

Specific Proteins ◽

Female Specific ◽

Estradiol 17Β

Mature male medaka were continuously exposed to 0.005, 0.0–5 or 1.0 ppb of estradiol-17β (E2 or 0.1, 10 or 100 ppb of p-nonylphenol (NP) or bis-phenol-A (BPA). Female-specific proteins (Fsp) were induced in medaka exposed to 0.005 ppb of E2, 0.1 ppb of NP, or 10 ppb of BPA. Concentrations of 0.005 pbb of E2 and 0.1 ppb of NP corresponded to concentrations of these chemicals detected in river water in Japan. The abilities of the 3 chemicals to induce Fsp were E2> NP> BPA. Embryonic medaka were exposed to E2, NP and BPA under conditions of static-renewal for 200–230 days until pre-maturity. Survival ratios of medaka exposed to E2 and NP declined in concentrations more than 25 ppb and 50 ppb, respectively. The groups of medaka exposed to E2 had individuals with testis-ova or abnormal gonad. There was no male in exposure to 1.0 ppb E2. When exposed to 100 ppb of NP or BPA, abnormal gonad was also detected. Abnormal anal fin (female-like) was observed in male exposed to 100 ppb of NP. The LC50 values for each of the 3 chemicals were much higher than the concentrations detected in water in the environment—the 3 chemicals were considered to have no lethal effect on medaka in aquatic environments. However, exposures to E2 or NP at environmental concentrations induced Fsp. BPA also had the ability to affect medaka as an environmental estrogen, although its extrogenic activity was weaker than that of E2 or NP.

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A Kleptoparasitic Cecidomyiid and Other Flies Associated With Spiders

Psyche A Journal of Entomology ◽

10.1155/1980/27685 ◽

1980 ◽

Vol 87 (3-4) ◽

pp. 337-348 ◽

Cited By ~ 25

Author(s):

John Sivinski ◽

Mark Stowe

Keyword(s):

North America ◽

Mature Male ◽

North Central ◽

Central Florida ◽

Single Exception ◽

Dominant Member

Spiders and their webs are predictable sources of insect cadavers. A small number of animals regularly exploit this resource, either as kleptoparasites or commensals, depending on whether symbionts compete for the same prey (see Robinson and Robinson, 1977, for more detailed terminology). Among the thieves are specialized spiders (citations in Vollrath 1979a, 1979b), mature male and juvenile spiders (Stowe 1978, citations in Nyffeler and Benz 1980), Hemiptera (Davis and Russell 1969), a hummingbird (takes webbing in addition to small insects, Young 1971), panorpid scorpion-flies (Thornhill 1975), Lepidoptera larvae (Robinson 1978), wasps (Jeanne 1972), damselflies (Vollrath 1977), and a handful of flies (reviews in Knab 1915; Bristowe 1931, 1941; Lindner 1937; Richards 1953; Robinson and Robinson 1977). Only a few of the reports on Diptera kleptoparasites originate from North America (McCook 1889, Frost 1913, Downes and Smith 1969). With a single exception (Downes and Smith 1969), all of the previously described kleptoparasitic flies belong to the Brachycera and Cyclorrhapha. We report here on a surprisingly diverse kleptoparasitic Diptera fauna in north central Florida with a cecidomyiid (Nematocera) as its dominant member.

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