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1. Hang on or run? Copepod mating versus predation risk in contrasting environments

Author:
Jersabek, Christian D.; Luger, Martin S.; Schabetsberger, Robert; Grill, Susanne; Strickler, J. Rudi
Source:
Oecologia 2007 v.153 no.3 pp. 761-773
ISSN:
0029-8549
Subject:
Copepoda; copulation; dimorphism; females; fish; lakes; males; natural selection; paternity; pigmentation; predation; risk; risk reduction; spermatophores; spermatozoa
Abstract:
... Mating durations of copepods were found to differ significantly between fishless high-altitude waters and lowland lakes containing fish. In lowland species the whole mating process was completed within a few minutes, but it averaged over an hour in high-altitude species. Alpine copepods showed a prolonged post-copulatory association between mates, during which the male clasped the female for an ex ...
DOI:
10.1007/s00442-007-0768-1
PubMed:
17541790

2. Growth differences and dimorphic expression of growth hormone (GH) in female and male Cynoglossus semilaevis after male sexual maturation

Author:
Xiang-Shan Ji; Han-Wen Liu; Song-Lin Chen; Yun-Liang Jiang; Yong-Sheng Tian
Source:
Marine genomics 2011 v.4 no.1 pp. 9-16
ISSN:
1874-7787
Subject:
sexual maturity; messenger RNA; dimorphism; complementary DNA; somatotropin; body weight; Cynoglossus semilaevis; males; models; introns; reverse transcriptase polymerase chain reaction; gene expression; fish; exons; females
Abstract:
... Half-smooth tongue sole, Cynoglossus semilaevis, is an ideal model to investigate the regulatory mechanisms of sexual growth dimorphism in fish species. The aim of the study was to investigate the effect of differential age of sexual maturity for females and males on growth and GH mRNA expression in C. semilaevis. The body weight differences between the sexes were not significant in C. semilaevis ...
DOI:
10.1016/j.margen.2010.11.002
PubMed:
21429460

3. Molecular cloning, expression analysis of insulin-like growth factor I (IGF-I) gene and IGF-I serum concentration in female and male Tongue sole (Cynoglossus semilaevis)

Author:
Qian Ma; Shu-Fang Liu; Zhi-Meng Zhuang; Zhong-Zhi Sun; Chang-Lin Liu; Yong-Quan Su; Qi-Sheng Tang
Source:
Comparative biochemistry and physiology 2011 v.160 no.4 pp. 208-214
ISSN:
1096-4959
Subject:
Cynoglossus semilaevis; adults; amino acids; blood serum; complementary DNA; dimorphism; enzyme-linked immunosorbent assay; females; fish; gender differences; gene expression; genes; insulin-like growth factor I; liver; males; messenger RNA; molecular cloning; open reading frames; polypeptides
Abstract:
... Insulin-like growth factor I (IGF-I) is a polypeptide hormone that regulates growth during all stages of development in vertebrates. To examine the mechanisms of the sexual growth dimorphism in the Tongue sole (Cynoglossus semilaevis), molecular cloning, expression analysis of IGF-I gene and IGF-I serum concentration analysis were performed. As a result, the IGF-I cDNA sequence is 911bp, which con ...
DOI:
10.1016/j.cbpb.2011.08.008

4. Contrasting growth strategies of pond versus marine populations of nine-spined stickleback (Pungitius pungitius): a combined effect of predation and competition?

Author:
Gábor Herczeg; Abigél Gonda; Anna Kuparinen; Juha Merilä
Source:
Evolutionary ecology 2012 v.26 no.1 pp. 109-122
ISSN:
0269-7653
Subject:
Pungitius pungitius; body size; correlation; dimorphism; fecundity; females; fish; intraspecific competition; males; marine environment; ponds; predation
Abstract:
... Gigantism in isolated ponds in the absence of sympatric fish species has previously been observed in nine-spined sticklebacks (Pungitius pungitius). Patterns in sexual size dimorphism suggested that fecundity selection acting on females might be responsible for the phenomenon. However, the growth strategy behind gigantism in pond sticklebacks has not been studied yet. Here, we compared von Bertala ...
DOI:
10.1007/s10682-011-9491-9

5. Genomic structure, polymorphism and expression analysis of the growth hormone (GH) gene in female and male Half-smooth tongue sole (Cynoglossus semilaevis)

Author:
Qian Ma; ShuFang Liu; ZhiMeng Zhuang; Lin Lin; ZhongZhi Sun; ChangLin Liu; Hui Ma; YongQuan Su; QiSheng Tang
Source:
Gene 2012 v.493 no.1 pp. 92-104
ISSN:
0378-1119
Subject:
fish; adults; polypeptides; microsatellite repeats; open reading frames; Cynoglossus semilaevis; males; rapid amplification of cDNA ends; gene expression; amino acids; genotype; signal peptide; gene expression regulation; introns; females; messenger RNA; dimorphism; complementary DNA; somatotropin; exons; gender differences; hatcheries; Yellow Sea
Abstract:
... Growth hormone (GH) is a polypeptide which is an important regulator of development and somatic growth in teleosts, and may be associated with the mechanisms which drive sexual growth dimorphism in the Half-smooth tongue sole (Cynoglossus semilaevis). In this study, the full length gh cDNA was cloned from C. semilaevis by homology cloning and the rapid amplification of cDNA ends polymerase chain r ...
DOI:
10.1016/j.gene.2011.11.015
PubMed:
22120536

6. Evolution of mating systems and sexual size dimorphism in North American cyprinids

Author:
M. Pyron; T. E. Pitcher; S. J. Jacquemin
Source:
Behavioral ecology and sociobiology 2013 v.67 no.5 pp. 747-756
ISSN:
0340-5443
Subject:
Cyprinidae; body size; dimorphism; females; fish; males; mating systems; models; phylogeny; spawning; sperm competition; testes
Abstract:
... Mating systems evolve with sexual size dimorphism (SSD) in many animals. Mating systems with males larger than females occur when males compete for female access or guard territories, while mating systems with group mating tend to occur in species where females are the same size or larger than males. In addition to variation in SSD with mating system, sperm competition varies among mating systems ...
DOI:
10.1007/s00265-013-1498-5

7. Polyculture of mixed-sex and male populations of Nile tilapia (Oreochromis niloticus) with the Mayan cichlid (Cichlasoma urophthalmus)

Author:
Martha Hernández; Eucario Gasca-Leyva; Ana Milstein
Source:
Aquaculture 2014 v.418-419 pp. 26-31
ISSN:
0044-8486
Subject:
Cichlasoma; Oreochromis niloticus; aeration; alkalinity; ammonium nitrogen; biomass; body weight; crude protein; diet; dimorphism; eggs; females; fiberglass; fish; intraspecific competition; introduced species; larvae; males; nitrites; pH; sexual maturity; tanks; temperature; water flow
Abstract:
... The purpose of this study was to test polyculture of Nile tilapia and the native Mayan cichlid, as an alternative production method of tilapia. The experiment had a 2×4 factorial design: the first factor was the population of tilapia (mixed-sex and 95% males) and the second factor was the proportion of Nile tilapia: Mayan cichlid (3:1, 5:1, 7:1 and 1:0). Proportion of 1:0 was tilapia monoculture. ...
DOI:
10.1016/j.aquaculture.2013.09.035

8. Small-scale variation in sexual size dimorphism and sex ratio in the aquatic moth Acentria ephemerella Denis and Schiffermüller, 1775 (Lepidoptera: Crambidae)

Author:
Oliver Miler; Elisabeth M. Gross; Dietmar Straile
Source:
Aquatic insects 2014 v.36 no.3-4 pp. 187-199
ISSN:
1744-4152
Subject:
Acentria ephemerella; Crambidae; Potamogeton; dimorphism; females; fish; herbivores; larvae; littoral zone; moths; population density; population size; predation; pupae; sex ratio; summer
Abstract:
... The aquatic herbivorous and capital-breeding moth Acentria ephemerella Denis and Schiffermüller, 1775 feeds on submerged pondweeds, Potamogeton spp., and is highly preyed upon by fish in the littoral zone. We studied the spatiotemporal within-lake variability of length, sexual size dimorphism (SSD) and sex ratio of A. ephemerella pupae and of larval population densities. Population densities at th ...
DOI:
10.1080/01650424.2015.1066015

9. Social Reversal of Sex‐Biased Aggression and Dominance in a Biparental Cichlid Fish (Julidochromis marlieri)

Author:
Kelsey J. Wood; Victoria H. Zero; Albyn Jones; Suzy C. P. Renn; W. Koenig
Source:
Ethology 2014 v.120 no.6 pp. 540-550
ISSN:
0179-1613
Subject:
Cichlidae; aggression; breeding; dimorphism; eggs; females; fish; gender differences; males; models; nests; progeny; social environment; territoriality
Abstract:
... In biparental species, aggression, dominance, and parental care are typically sexually dimorphic. While behavioral dimorphism is often strongly linked to gonadal sex, the environment—either social or ecological—may also influence sex‐biased behavior. In the biparental cichlid fish Julidochromis marlieri, the typical social environment for breeding pairs consists of large females paired with smalle ...
DOI:
10.1111/eth.12227

10. Experimental evidence for sex-specific plasticity in adult brain

Author:
Gábor Herczeg; Abigél Gonda; Gergely Balázs; Kristina Noreikiene; Juha Merilä
Source:
Frontiers in zoology 2015 v.12 no.1 pp. 38
ISSN:
1742-9994
Subject:
Gasterosteus aculeatus; adulthood; adults; birds; brain; dimorphism; environmental enrichment; females; fish; fish behavior; males; mammals; neurogenesis; ontogeny; rearing
Abstract:
... BACKGROUND: Plasticity in brain size and the size of different brain regions during early ontogeny is known from many vertebrate taxa, but less is known about plasticity in the brains of adults. In contrast to mammals and birds, most parts of a fish’s brain continue to undergo neurogenesis throughout adulthood, making lifelong plasticity in brain size possible. We tested whether maturing adult thr ...
DOI:
10.1186/s12983-015-0130-0
PubMed:
26705404
PubMed Central:
PMC4690261

11. Identification of a male-specific DNA marker in the large yellow croaker (Larimichthys crocea)

Author:
Aiqiang Lin; Shijun Xiao; Shuangbin Xu; Kun Ye; Xiaoyu Lin; Sha Sun; Zhiyong Wang
Source:
Aquaculture 2017 v.480 pp. 116-122
ISSN:
0044-8486
Subject:
dimorphism; males; breeding; polymerase chain reaction; biotechnology; Larimichthys crocea; sex determination; genetic markers; genotyping; fish; introns; females; agar gel electrophoresis; China
Abstract:
... Understanding sex determination mechanisms is the first and most paramount step in the development of sex control breeding biotechnologies for fish. The large yellow croaker (Larimichthys crocea) is an economically vital fish in China and East Asia, which exhibits a sex-related growth dimorphism where females grow significantly faster than males. However, the lack of a rapid and accurate sex speci ...
DOI:
10.1016/j.aquaculture.2017.08.009

12. Effects of Estradiol and Testosterone on the Expression of Growth‐related Genes in Female and Male Nile Tilapia, Oreochromis niloticus

Author:
Mengmeng Yue; Jinliang Zhao; Shoujie Tang; Yan Zhao
Source:
Journal of the World Aquaculture Society 2018 v.49 no.1 pp. 216-228
ISSN:
0893-8849
Subject:
Oreochromis niloticus; blood serum; dimorphism; estradiol; females; fish; genes; growth performance; males; muscles; somatomedins; somatotropin; steroid hormones; testosterone
Abstract:
... Nile tilapia exhibits strong sexual growth dimorphism. The potential role of sex steroid hormones in sexual growth dimorphism is not fully understood. We investigated the effects of estradiol (E₂) and testosterone (T) on growth rate, plasma sex hormones, and expression of growth hormone (GH)‐insulin‐like growth factor (IGF) axis genes and muscle regulatory factor (MRF) genes in female and male Nil ...
DOI:
10.1111/jwas.12428

13. Temporal patterns and sex differences in dyadic interactions in a wild zebrafish population

Author:
Aditya Ghoshal; Danita K. Daniel; Anuradha Bhat
Source:
Behavioural processes 2019 v.166 pp. 103896
ISSN:
0376-6357
Subject:
Danio rerio; aggression; breeding; courtship; dimorphism; ecology; females; fish; gender differences; gravel; males; models; oviposition
Abstract:
... Male-female interactions in several group living organisms, including some fish species tend to be dynamic and play a key role in determining their mating and courtship behavior. Laboratory-bred zebrafish (Danio rerio) strains are one of the most widely used model systems in various fields of biology. While research on wild zebrafish behavior is gaining ground, our knowledge about their mating eco ...
DOI:
10.1016/j.beproc.2019.103896

14. Breeding of YY super-male of blotched snakehead (Channa maculata) and production of all-male hybrid (Channa argus ♀ × C. maculata ♂)

Author:
Jian Zhao; Mi Ou; Yaping Wang; Haiyang Liu; Qing Luo; Xinping Zhu; Baixiang Chen; Kunci Chen
Source:
Aquaculture 2021 v.538 pp. 736450
ISSN:
0044-8486
Subject:
Channa argus; Channa maculata; aquaculture; artificial insemination; average daily gain; dimorphism; females; fish; genotype; growth performance; hybrids; industry; interspecific hybridization; males; prices; progeny; sex ratio; sex reversal; China
Abstract:
... Many commercially important fish species show significant sex dimorphism in growth and size. Breeding mono-sex stocks could improve economic benefits of farmers. The snakehead fish is massively cultured in China, over 0.5 million tons per year. The sex dimorphism of snakehead is remarkable, in which males are meanly twice in growth and size than females. Furtherly, the individual size of the marke ...
DOI:
10.1016/j.aquaculture.2021.736450