CHANGES IN GROWTH, SECONDARY SEX CHARACTERISTICS, AND REPRODUCTION OF FATHEAD MINNOWS EXPOSED FOR A LIFE CYCLE TO BLEACHED SULFITE MILL EFFLUENT

2004 ◽  
Vol 67 (20-22) ◽  
pp. 1755-1764 ◽  
Author(s):  
Joanne L. Parrott ◽  
Craig S. Wood ◽  
Peter Boutot ◽  
Susan Dunn
Keyword(s):  
Life Cycle ◽  
Sex Characteristics ◽  
Fathead Minnows ◽  
Secondary Sex Characteristics

Effects of waterborne exposure of 17 β-estradiol on secondary sex characteristics and gonads of fathead minnows (Pimephales promelas)

1999 ◽  
Vol 47 (2) ◽  
pp. 129-145 ◽  
Author(s):  
Stephanie R Miles-Richardson ◽  
Vincent J Kramer ◽  
Scott D Fitzgerald ◽  
James A Render ◽  
Behzad Yamini ◽  
...  
Keyword(s):  
Pimephales Promelas ◽  
Sex Characteristics ◽  
Fathead Minnows ◽  
Secondary Sex Characteristics ◽  
Waterborne Exposure

Fathead Minnow Lifecycle Tests for Detection of Endocrine-Disrupting Substances in Effluents

2002 ◽  
Vol 37 (3) ◽  
pp. 651-667 ◽  
Author(s):  
Joanne L. Parrott ◽  
Craig S. Wood
Keyword(s):  
Fathead Minnow ◽  
Real Life ◽  
Sex Characteristics ◽  
Fathead Minnows ◽  
Secondary Sex Characteristics ◽  
Endocrine Disrupting ◽  
Male Sex ◽  
High Concentrations ◽  
Growth Changes ◽  
Very High

Abstract The goal of this study was to assess the responses of fathead minnows (FHM) exposed to known endocrine-disrupting substances (EDS) in our labs. As well, we wanted to examine the applicability and sensitivity of the full lifecycle FHM test for use on-site, exposing fish to a complex environmentally relevant Canadian effluent. Fathead minnows exposed from the egg stage to ethinylestradiol (EE2, 0-32 ng/L) or methyltestosterone (MT, 0-3200 ng/L) had decreased growth (length, weight) at high concentrations. Development of secondary sex characteristics was a sensitive indicator of exposure to androgen and estrogen. Fish exposed to MT showed premature male sex characteristics such as nuptial tubercles by 30 days post-hatch (dph). These changes were more dramatic in older fish (at 60 and 90 dph), which showed premature male sex characteristics at very low MT concentrations (100 ng/L). Fish exposed to 3.2 ng/L EE2 had premature development of ovipositors at 60 dph. As well, exposure to very high MT concentrations (1000 and 3200 ng/L) caused development of ovipositors after 60 days (but not at 20 and 30 dph), presumably due to aromatization of MT to methylestradiol (as suggested by other researchers). The fathead minnow lifecycle assay, tested with a known estrogen and androgen, proved to be useful for detection of EDS-related changes caused by a real-life effluent mixture. Lifecycle exposures of fathead minnow eggs to bleached sulphite mill effluent (BSME) showed changes in secondary sex characteristics and growth. In contrast to EE2 and MT, fish exposed to BSME had increased growth. Changes in secondary sex characteristics of fish were seen in both male and female minnows exposed to BSME, but there was an overall shift towards increasing numbers of female fish (based on external sex). The full lifecycle assay provides a definitive test for reproductive/EDS effects, and it appears that some of the most sensitive endpoints we studied were the premature development of secondary sex characteristics.

scholarly journals Women’s Preferences for Strong Men Under Perceived Harsh Versus Safe Ecological Conditions

2021 ◽  
Vol 19 (3) ◽  
pp. 147470492110323
Author(s):  
Ray Garza ◽  
Farid Pazhoohi ◽  
Jennifer Byrd-Craven
Keyword(s):  
Ecological Factors ◽  
Ecological Condition ◽  
Sex Characteristics ◽  
Ecological Conditions ◽  
University Women ◽  
Secondary Sex Characteristics ◽  
Trade Offs ◽  
Forced Choice Task ◽  
Women’S Preferences ◽  
Physical Features

Ecological conditions provide information about available resources for one’s environment. In humans, this has been shown to influence reproductive behavior, as individuals may engage in trade-offs between partner quality and investment. For instance, many women may trade-off preferences for men with physical features indicative of social dominance and health over physical features indicative of commitment and investment. The current study explored women’s preferences for formidable men under safe vs. harsh ecological conditions. Across three studies, U.S. university women ( N = 1,098) were randomly assigned to a perceived harsh or safe ecological condition. They were asked to rate the attractiveness of men’s body types (i.e., muscular vs. less muscular). Findings revealed that in general, women rated stronger men as more attractive than weaker men irrespective of the ecological condition. Evidence for preference as a function of ecology appeared only when a two-alternative forced-choice task was used (Study 3), but not in rating tasks (Studies 1 and 2). Study 3 showed that women had a relatively stronger preference for stronger men for short-term relationships in a resource scarce ecological condition. This research provides some evidence that perceived ecological conditions can drive women’s preferences for men with enhanced secondary sex characteristics as a function of mating context. These findings are consistent with previous research indicating the importance of physical characteristics in men’s attractiveness, and it adds to the existing literature on ecological factors and mating preferences.

Effects of Long-Term Exposure to Carbaryl (Sevin) on Survival, Growth, and Reproduction of the Fathead Minnow (Pimephales promelas)

1972 ◽  
Vol 29 (5) ◽  
pp. 583-587 ◽  
Author(s):  
A. R. Carlson
Keyword(s):  
Life Cycle ◽  
Fathead Minnow ◽  
Pimephales Promelas ◽  
Threshold Concentration ◽  
Fathead Minnows ◽  
Motile Sperm ◽  
High Concentration ◽  
Toxicant Concentration ◽  
Growth And Reproduction

When fathead minnows (Pimephales promelas) were exposed to five concentrations (0.008–0.68 mg/liter) of the insecticide carbaryl for 9 months and throughout a life cycle, the highest concentration prevented reproduction and decreased survival. At the high concentration, testes contained motile sperm and ovaries were in a flaccid condition and appeared to be in a resorptive state. At the 0.68 mg/liter concentration, carbaryl appeared to contribute to mortality of larvae (produced by unexposed parents) within 30 days of hatching. Survival of young grown in the 0.008 mg/liter concentration was reduced. Since no demonstrable effects were noted for survival, growth, or reproduction at the 0.017, 0.062, and 0.21 mg/liter concentrations, this low survival value is considered not due to carbaryl. The 96-hr median tolerance concentration (TL 50) and the lethal threshold concentration (LTC) for 2-month-old fathead minnows were 9.0 mg/liter. The maximum acceptable toxicant concentration (MATC) for fathead minnows exposed to carbaryl in water with a hardness of 45.2 mg/liter and a pH of 7.5 lies between 0.21 and 0.68 mg/liter. The application factors (MATC/96-hr TL50 and MATC/LTC) both lie between 0.023 and 0.075.

GYNECOLOGY OF CHILDREN AND ADOLESCENTS

PEDIATRICS ◽  
1958 ◽  
Vol 22 (2) ◽  
pp. 395-400
Author(s):  
John W. Huffman ◽  
Elsie Wieczorowski
Keyword(s):  
Round Table ◽  
Late Childhood ◽  
Sex Characteristics ◽  
Vaginal Mucosa ◽  
Relative Incidence ◽  
Secondary Sex Characteristics ◽  
Etiologic Agents ◽  
Special Clinic ◽  
History Of ◽  
Phases Of Development

THE DISCUSSANTS began the round table with a few general comments concerning various phases of development of the female. At birth and for the first week or more of life, the effects of maternal hormones on the newborn infant may be evidenced by hypertrophy of the breasts, prominence of the genitalia with nonpurulent vaginal secretion and occasional uterine bleeding. Throughout the remainder of infancy, until late childhood, there are no changes in the genitalia, and the mucosa of the vagina remains shrunken, producing little or no secretion. From the period of late childhood to early adolescence—that phase extending from the first menstrual period until the onset of ovulation—secondary sex characteristics develop and the vaginal mucosa undergoes cornification, becomes succulent and produces an increased quantity of secretion. Late adolescence is defined as that phase from the first ovulation to full maturity. The phases of adolescence are never clearly demarcated. Certain pathologic conditions commonly seen in female children were then described. The relative incidence of these conditions as seen in a special clinic reflects their incidence in a general pediatric practice. Nonspecific Vulvovaginitis The majority of children (75%) are referred to the gynecologic clinic because of vulvovaginitis. Of these, 75% are found to have nonspecific vulvovaginitis. Etiologic agents and their relative incidence in the remainder of patients are: monilia, 15%; foreign body, 5%; and infections due to trichomonas, gonococcus and pinworms, 5%. Children under 10 years of age are most commonly affected. Those found to have vulvovaginitis due to fungi have usually given a history of recent antibiotic therapy.

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