scholarly journals Insecticidal juvenile hormone analogs stimulate the production of male offspring in the crustacean Daphnia magna.

2003 ◽  
Vol 111 (7) ◽  
pp. 919-924 ◽  
Author(s):  
Allen W Olmstead ◽  
Gerald A LeBlanc
Keyword(s):  
Juvenile Hormone ◽  
Daphnia Magna ◽  
Male Offspring ◽  
Hormone Analogs

Diofenolan induces male offspring production through binding to the juvenile hormone receptor in Daphnia magna

2015 ◽  
Vol 159 ◽  
pp. 44-51 ◽  
Author(s):  
Ryoko Abe ◽  
Kenji Toyota ◽  
Hitoshi Miyakawa ◽  
Haruna Watanabe ◽  
Tomohiro Oka ◽  
...  
Keyword(s):  
Juvenile Hormone ◽  
Daphnia Magna ◽  
Hormone Receptor ◽  
Male Offspring ◽  
Offspring Production

Genetic differences in the production of male neonates in Daphnia magna exposed to juvenile hormone analogs

Chemosphere ◽  
2006 ◽  
Vol 63 (9) ◽  
pp. 1477-1484 ◽  
Author(s):  
Shigeto Oda ◽  
Norihisa Tatarazako ◽  
Hajime Watanabe ◽  
Masatoshi Morita ◽  
Taisen Iguchi
Keyword(s):  
Juvenile Hormone ◽  
Daphnia Magna ◽  
Genetic Differences ◽  
Hormone Analogs

EFFECTS OF ECDYSONES, JUVENILE HORMONE ANALOGS, AND 6-OXOOCTANOIC ACID ON THE DEVELOPMENT OF THE MOSQUITO, CULEX TARSALIS (DIPTERA: CULICIDAE)

1974 ◽  
Vol 106 (1) ◽  
pp. 79-85 ◽  
Author(s):  
P. I. Ittycheriah ◽  
M. S. Quraishi ◽  
E. P. Marks
Keyword(s):  
Juvenile Hormone ◽  
Topical Treatment ◽  
Adult Emergence ◽  
Fourth Instar ◽  
Culex Tarsalis ◽  
Juvenile Hormone Analog ◽  
Hormone Analog ◽  
High Doses ◽  
Hormone Analogs ◽  
Very High

AbstractEggs, larvae, and pupae of Culex tarsalis Coquillett were treated with ecdysones, juvenile hormone analogs, and 6-oxooctanoic acid. Effects of these agents on mortality, induction of supernumerary stages, and adult emergence were determined. Topical treatment of eggs with CRD9499 (a juvenile hormone analog), β-ecdysone, and 22-isoecdysone caused a reduction in adult emergence. Treatment of fourth-instar larvae with these chemicals not only induced mortality but also caused the formation of supernumerary intermediate stages. Larvae of C. tarsalis were very susceptible to CRD9499, but pupae were resistant. The ecdysones caused some mortality but only at very high doses and would thus be of little use as larvicides. 6-Oxooctanoic acid caused high rates of mortality at 0.001 M concentrations.

scholarly journals Sex determination and gene expression in Daphnia magna exposed to juvenile hormone

2019 ◽  
Vol 41 (4) ◽  
pp. 393-406 ◽  
Author(s):  
Maggie Wuerz ◽  
Steve Whyard ◽  
Nancy L Loadman ◽  
Murray D Wiegand ◽  
Judith D Huebner
Keyword(s):  
Sex Determination ◽  
Juvenile Hormone ◽  
Sexual Reproduction ◽  
Daphnia Magna ◽  
Endocrine System ◽  
Population Expansion ◽  
Female Offspring ◽  
Environmental Threat ◽  
Male Sex ◽  
Favorable Conditions

Abstract Daphnia spp. cycle between asexual and sexual reproduction depending on environmental conditions. Under favorable conditions, female offspring are produced, resulting in rapid population expansion; in less favorable conditions, males are produced, initiating the sexual portion of their lifestyle. Although mediated by environmental cues, sex determination is ultimately dependent on the expression of Doublesex genes, Dsx1 and Dsx2, in Daphnia. We exposed Daphnia magna to juvenile hormone III (JHIII), an insect hormone often mimicked by agricultural insecticides. Juvenile hormone (JH) and JH analogues disrupt the insect endocrine system, inhibiting reproduction; these chemicals pose an environmental threat to non-target organisms by leaching into surrounding waters. When Daphnia are exposed to JH or JH analogues, it causes a premature shift from asexual to sexual reproduction. We showed that Dsx1 is upregulated throughout vitellogenesis in female D. magna producing male offspring and Dsx2 is upregulated during late vitellogenesis, suggesting that both Dsx1 and Dsx2 contribute to male sex determination. In addition, Dsx2 expression increases during sexual maturation in male D. magna, suggesting that it also plays a role in spermatogenesis. In addition, exposure to JHIII decreased reproductive output, slowed growth and prematurely shifted D. magna reproductive strategy to the sexual portion of their lifecycle.

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