RELATIVE TOXICITY OF SIX INSECTICIDES TO MALE AND FEMALE PHOLETESOR ORNIGIS (WEED) (HYMENOPTERA: BRACONIDAE), A PARASITE OF THE SPOTTED TENTIFORM LEAFMINER, PHYLLONORYCTER BLANCARDELLA (FABR.) (LEPIDOPTERA: GRACILLARIIDAE)

1987 ◽  
Vol 119 (2) ◽  
pp. 153-157 ◽  
Author(s):  
R.M. Trimble ◽  
D.J. Pree
Keyword(s):  
Sexual Difference ◽  
Relative Toxicity ◽  
Control Potential ◽  
Pyrethroid Insecticides ◽  
Male And Female ◽  
Biological Control Potential ◽  
Phyllonorycter Blancardella ◽  
Low Levels ◽  
Two Populations ◽  
Pholetesor Ornigis

AbstractThe susceptibility of male and female Pholetesor ornigis (Weed) to the pyrethroid insecticides permethrin, fenvalerate, and deltamethrin, the organophosphorous insecticides azinphosmethyl and phosmet, and the carbamate insecticide methomyl, was compared in the laboratory using two populations from Norfolk County, Ontario. Female P. ornigis were more susceptible than males to permethrin. There was no sexual difference in the susceptibility of P. ornigis to the other five insecticides tested. The implications of these results for the biological control potential of P. ornigis in commercial apple orchards are discussed. The results obtained for permethrin, fenvalerate, azinphosmethyl, and methomyl were compared with those obtained in a study completed 6 years earlier using P. ornigis from another location in Ontario; the results suggest that P. ornigis from Norfolk County have low levels of resistance to permethrin (3.3-fold), fenvalerate (2.2-fold), and methomyl (4.1-fold).

EFFECTS OF PYRETHROID INSECTICIDES ON EGGS AND LARVAE OF RESISTANT AND SUSCEPTIBLE POPULATIONS OF SPOTTED TENTIFORM LEAFMINER

1986 ◽  
Vol 118 (11) ◽  
pp. 1123-1130 ◽  
Author(s):  
D.B. Marshall ◽  
D.J. Pree
Keyword(s):  
Pyrethroid Insecticides ◽  
Larval Stages ◽  
Resistant Strains ◽  
Phyllonorycter Blancardella ◽  
Low Levels ◽  
Susceptible Populations ◽  
Eggs And Larvae

AbstractResistance to pyrethroid insecticides, identified previously in adults of Phyllonorycter blancardella (Fabr.), was shown to extend to both egg and larval stages. Eggs of both resistant and susceptible strains were more susceptible than larvae to various pyrethroid insecticides. Eggs treated 0–2 days post oviposition were more susceptible than 4- to 6-day-old eggs and/or larvae for both strains. Older larvae, especially from resistant strains, were less susceptible than early instars. For eggs and 1st-instar larvae, differences between resistant and susceptible strains were largely overcome by treatment with higher concentrations of permethrin. In the field, low levels of resistance were overcome by applications of permethrin at 212.5 g AI/ha diluted in 3370 L water/ha timed for first hatch of eggs.

TOXICITY OF PERMETHRIN, AZINPHOSMETHYL, AND METHOMYL TO PHOLETESOR ORNIGIS (WEED) AND PHOLETESOR PEDIAS NIXON (HYMENOPTERA: BRACONIDAE), PARASITES OF THE SPOTTED TENTIFORM LEAFMINER, PHYLLONORYCTER BLANCARDELLA (FABR.) (LEPIDOPTERA: GRACILLARIIDAE)

1991 ◽  
Vol 123 (6) ◽  
pp. 1175-1182
Author(s):  
P.A. Fisher ◽  
J.E. Laing ◽  
D.J. Pree
Keyword(s):  
Consistent Difference ◽  
Pyrethroid Insecticides ◽  
Phyllonorycter Blancardella ◽  
The Difference ◽  
Pholetesor Ornigis ◽  
Laboratory Bioassays

AbstractThe toxicity of the insecticides permethrin, azinphosmethyl, and methomyl to adult Pholetesor ornigis (Weed) and P. pedias Nixon was evaluated in laboratory bioassays. Older P. pedias (2 and 3 days old) were more susceptible than younger parasites (1 day old) to permethrin. Azinphosmethyl was slightly more toxic to female P. ornigis than to male P. ornigis or to P. pedias. There was no consistent difference in the response of adult P. ornigis compared with P. pedias exposed to permethrin or methomyl on treated paper disks. Methomyl was twice as toxic as either azinphosmethyl or permethrin. Male P. ornigis were less susceptible than female P. ornigis to permethrin, but the difference was significant in only one of four populations tested. Male P. ornigis were less susceptible than females to azinphosmethyl. In 1986, populations of P. ornigis which had been exposed previously to pyrethroid insecticides were less susceptible to permethrin than P. ornigis from orchards where pyrethroids had never been applied. The response of both Pholetesor spp. to permethrin varied significantly from 1986 to 1987.

Thomas Aquinas on Sexual Difference: The Metaphysical Biology and Moral Significance of Human Sexuality

Pro Ecclesia ◽  
2021 ◽  
Vol 30 (2) ◽  
pp. 177-215
Author(s):  
Paul Gondreau
Keyword(s):  
Sexual Difference ◽  
Human Sexuality ◽  
Thomas Aquinas ◽  
Moral Significance ◽  
Male And Female ◽  
Biological Design ◽  
Moral Excellence ◽  
Structural Differences ◽  
The Mean ◽  
And Gender

Thomas Aquinas offers for his time a novel take on human sexual difference, in that he grounds human sexuality in what we might term a metaphysical biology and accords it a privileged role in the moral life. Though his biology is drawn from Aristotle, which leads Aquinas to make problematic statements on sexual difference, he nonetheless offers a perspective that remains deeply relevant and significant for today. His method or approach of tethering sexual difference first and foremost to our animal-like biological design remains perennial, particularly at a time when many seek to dismiss biology as irrelevant to sexual identity and gender difference. The latest findings of the emerging field of neurobiology, which have uncovered structural differences between the male and female brains, offer key support to Aquinas’s approach. Even more important, he holds, in an unprecedented move, that sexual design and inclination provide a veritable source of moral excellence. He goes so far as to locate the mean of virtue in our sexual design and appetites.

scholarly journals An attempt at clarifying Maximus the Confesor’s remarks on (the fate of) sexual difference in Ambiguum 41

2021 ◽  
Vol 32 (2) ◽  
pp. 194-203
Author(s):  
Sotiris Mitralexis
Keyword(s):  
Sexual Difference ◽  
Human Person ◽  
Close Reading ◽  
Church Fathers ◽  
Male And Female ◽  
The Subject ◽  
The Difference ◽  
Maximus The Confessor ◽  
As If

Maximus the Confessor?s Ambiguum 41 contains some rather atypical observations concerning the distinction of sexes in the human person. There is a certain ambiguity as to whether the distinction of the sexes was intended by God and is ?by nature? (as found in Genesis and asserted by most Church Fathers) or a product of the Fall. Namely, Christ is described three times as ?shaking out of nature the distinctive characteristics of male and female?, ?driving out of nature the difference and division of male and female? and ?removing the difference between male and female?. Different readings of those passages engender important implications that can be drawn out from the Confessor?s thought, both eschatological implications and otherwise. The subject has been picked up by Cameron Partridge, Doru Costache and Karolina Kochanczyk-Boninska, among others, but is by no means settled, as they draw quite different conclusions. The noteworthy and far-reaching implications of Maximus? theological stance and problems are not the object of this paper. In a 2017 paper I attempted to demonstrate what Maximus exactly says in these peculiar and oft-commented passages through a close reading, in order to avoid a two-edged Maximian misunderstanding: to either draw overly radical implications from those passages, projecting decidedly non-Maximian visions on the historical Maximus, or none at all, as if those passages represented standard Patristic positions. Here, I am revisiting this argument, given that the interest in what the Confessor has to say on the subject seems to be increasing.

scholarly journals Sex influence on genetic expressions of early growth in Afshari lambs

2016 ◽  
Vol 59 (1) ◽  
pp. 9-17 ◽  
Author(s):  
F. Ghafouri-Kesbi ◽  
D. R. Notter
Keyword(s):  
Sexual Dimorphism ◽  
Fixed Effects ◽  
Early Growth ◽  
Domestic Sheep ◽  
Environmental Correlations ◽  
Male And Female ◽  
Selection Strategies ◽  
Genetic Components ◽  
Low Levels ◽  
Male To Female

Abstract. Very little is known about the genetic aspects of sexual dimorphism of body weight in domestic sheep, and therefore this study was conducted to quantify the genetic basis of sexual dimorphism for early-growth-related traits in Afshari lambs. Traits evaluated included birth weight (BW), weaning weight (WW), and growth rate (GR) in male and female lambs. Male lambs were 6.6 % heavier at birth, had 14.4 % higher preweaning growth rates and were 16.0 % heavier at weaning compared to female lambs. Levels of sexual-size dimorphism (SSD), expressed as the ratio of male to female means, for BW, WW and GR were 1.07, 1.14 and 1.15, respectively, which indicated low levels of SSD in the traits studied. Fixed effects of year of birth and type of birth interacted with sex effects, with greater variability in birth and weaning weights among years and birth types in male lambs, suggesting greater environmental sensitivity in the males. Bivariate animal models and restricted maximum likelihood (REML) procedures were used to estimate phenotypic variances and their genetic and non-genetic components in male and female lambs. Estimates of the direct heritability (h2) and additive coefficient of variation (CVA) for BW were higher in males. However, for WW and GR, heritability estimates were higher in females. In contrast, whereas the contribution of maternal permanent environmental effects (c2) to variation of BW was higher in females, for WW and GR higher estimates of c2 were observed in males. Respective genetic and maternal permanent environmental correlations between records on males and females were 0.986 and 0.723 for BW, 0.995 and 0.983 for WW, and 0.995 and 0.966 for GR, indicating possible sexual dimorphism only for maternal effects on BW. Based on an approximate 95 % confidence interval, none of the observed differences in variance components between sexes differed from zero and none of the observed genetic or maternal correlations differed from 1.0, indicating no need or opportunity for sex-specific selection strategies.

scholarly journals Genetic diversity in different populations of sloths assessed by DNA fingerprinting

2002 ◽  
Vol 62 (3) ◽  
pp. 503-508 ◽  
Author(s):  
N. MORAES ◽  
J. S. MORGANTE ◽  
C. Y. MIYAKI
Keyword(s):  
Genetic Diversity ◽  
Genetic Variability ◽  
Dna Fingerprinting ◽  
Genetic Similarity ◽  
Similarity Indices ◽  
Different Populations ◽  
Related Individuals ◽  
Low Levels ◽  
Dna Profiles ◽  
Two Populations

In this study we analyzed a population of Bradypus torquatus with individuals originally distributed in different localities of Bahia, and two populations of B. variegatus with individuals from Bahia and São Paulo States. Using the DNA fingerprinting method, we assessed the genetic variability within and between populations. Analysis of the DNA profiles revealed genetic similarity indices ranging from 0.34 ± 0.07 to 0.87 ± 0.04. Similar low levels of genetic variability were found only in isolated mammalian populations or among related individuals. This study presents the first analyses of genetic diversity in sloth populations.

scholarly journals Low levels of inbreeding depression and enhanced fitness in cleistogamous progeny in the annual plant Triodanis perfoliata

Botany ◽  
2019 ◽  
Vol 97 (7) ◽  
pp. 405-415 ◽  
Author(s):  
Beth H. Ansaldi ◽  
Jennifer J. Weber ◽  
Carol Goodwillie ◽  
Steven J. Franks
Keyword(s):  
Inbreeding Depression ◽  
Mixed Mating ◽  
Life Stages ◽  
Annual Plant ◽  
Flower Type ◽  
Low Levels ◽  
Two Populations ◽  
Selfing Species

The maintenance of outcrossing in cleistogamous plants that produce both open, facultatively outcrossing chasmogamous (CH), and closed, obligate selfing cleistogamous (CL) flowers is puzzling because CL reproduction is thought to be more reliable and less costly. A possible explanation for the maintenance of CH flowers is the avoidance of inbreeding depression. However, inbreeding depression for cleistogamous species has rarely been quantified. In this study, we estimate levels of inbreeding depression in plants from three populations of Triodanis perfoliata (L.) Nieuwl., a dimorphic cleistogamous annual, under greenhouse conditions. Estimates of inbreeding depression at multiple life stages in all three populations were low and often not different from zero. Inbreeding depression at specific life stages varied, with two populations showing later-acting inbreeding depression, which is also found in other selfing species. In two of the study populations, selfed CL progeny outperformed selfed CH progeny, indicating a flower-type effect. The low levels of inbreeding depression and the superior fitness of CL compared with selfed CH flowers that we observed make the maintenance of CH flowers in this system surprising, and suggest that other advantages of outcrossing CH flowers are likely responsible for maintaining mixed mating in this species.

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