Strong first sperm precedence in the freshwater hermaphroditic snail <i>Planorbella trivolvis</i>

Norton, Cynthia; Wright, M.

doi:10.1080/07924259.2019.1630019

Cited by 4 publications

(2 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ovotestis is an organ in mollusks in general that can produce egg cells and sperm cells simultaneously. However, groups of animals that have ovotestis are not able to auto fertilize [12]. Histopathological data of ovotestis F. ater in polluted rivers have not been found.…”

Section: Heavy Metal Pollution Especially Pb and Zn Can Hurt The Aqua...mentioning

confidence: 97%

Histopathological Analysis of Faunus Ater Ovotestis in Bale and Reuleueng Rivers, Aceh Besar Regency, Aceh Province Indonesia

Dewi

Agustina²,

Sarong³

et al. 2022

Open Access Maced J Med Sci

View full text Add to dashboard Cite

BACKGROUND: Faunus ater is one of the macrozoobenthos that is often consumed by the community, especially in the Leupung and Lhoknga areas, Aceh Besar District. The presence of Pb and Zn is suspected to be able to damage the body cells of F. ater, especially the ovotestis organ. Ovotestis is an organ in mollusks in general that can produce egg cells and sperm cells simultaneously. AIM: The purpose of this study was to analyze the level of damage to the Ovotestis of F. ater based on the state of the damaged Ovotestis cells. METHODS: The method of this research method is F. ater that samples were taken from Bale and Reuleung River, each river is divided into three stations and at each station, three samples of F. ater are taken. Ovotestical histopathological analysis was carried out at the Histology Laboratory, Faculty of Veterinary Medicine, Syiah Kuala University. Preparation of ovotestis histology preparations using the paraffin method. Previously, F. ater was terminated and carcass surgery was performed. The level of damage to female gametes and male gametes was carried out descriptively by observing gonadal cells undergoing necrosis, hypertrophy, and lysis. Observation of the level of damage to the ovotestis tissue of F. ater was carried out using a cell damage scoring system, namely, the level of damage, the type of damage, and the scoring value. RESULTS: The level of tissue damage to the ovotestis organ of F. ater was at level III with a score of 6. The highest percentage of damage occurred in Krueng Bale, namely, 19.027% for male gonads and 42.687% for female gonads. While the highest percentage of damage to ovotestis organ occurred in Krueng Reuleung 15,489% for male gonads and 40,695% for female gonads. CONCLUSION: The result shows that there was damage to the gonads of F. ater in Krueng Bale and Krueng Reuleung based on the number of fully-formed oocytes/sperm, the number of incompletely formed oocytes/sperm, and the number of damaged oocytes/sperm.

show abstract

Section: Heavy Metal Pollution Especially Pb and Zn Can Hurt The Aqua...mentioning

confidence: 97%

Histopathological Analysis of Faunus Ater Ovotestis in Bale and Reuleueng Rivers, Aceh Besar Regency, Aceh Province Indonesia

Dewi

Agustina²,

Sarong³

et al. 2022

Open Access Maced J Med Sci

View full text Add to dashboard Cite

show abstract

“…Thus, males mating with females irrespective of their signalling status risk losing paternity to males who concentrate their mating attempts closer to females' ovulation. Whether such losses translate into opportunity costs is also likely to depend on how quickly males can re-mate with new females after inseminating one (male mate choice theory in general predicts males to discriminate only when time and energy costs of each mating are non-negligible [29]).…”

Section: Introductionmentioning

confidence: 99%

Fertility signalling games: should males obey the signal?

Kovalov

Kokko

2023

Phil. Trans. R. Soc. B

View full text Add to dashboard Cite

Game theory is frequently used to study conflicting interests between the two sexes. Males often benefit from a higher mating rate than females do. A temporal component of this conflict has rarely been modelled: females' interest in mating may depend on when females become fertile. This sets conditions for male–female coevolution, where females may develop fertility signals, and males may obey the signal, such that they only target signalling females. Modelling this temporal aspect to sexual conflict yields two equilibria: (i) a trivial equilibrium without signals and with males targeting all females, and (ii) a signalling equilibrium where all females signal before ovulation, and where either some, or all, males obey the signal. The ‘all males obey the signal’ equilibrium is more likely if we assume that discriminating males have an advantage in postcopulatory sperm competition, while in the absence of this benefit, we find the ‘some males obey the signal’ equilibrium. The history of game-theoretic models of sex differences often portrays one sex as the 'winner' and the opposite sex as the ‘loser’. From early models emphasizing ‘battle of the sexes’-style terminology, we recommend moving on to describe the situation as non-signalling equilibria having stronger unresolved sexual conflict than signalling equilibria. This article is part of the theme issue ‘Half a century of evolutionary games: a synthesis of theory, application and future directions’.

show abstract

Web wars: males of the golden orb-web spider invest more in fights for mated females

2021

View full text Add to dashboard Cite

In addition to resource value, the cost of finding mates may affect how much males invest in fights for females. The cost of finding females may be imposed through natural factors extrinsic to males, such as female spatial distribution and predation pressure, which can be challenging to simulate in laboratory conditions. Therefore, studies under natural conditions may be suitable for understanding how the costs of finding mating partners affect male investment in fights. We used the spider Trichonephila clavipes to evaluate the hypotheses that males in field conditions invest more in contests for access to 1) unmated and 2) more fecund females and 3) when access to females is harder. To test these hypotheses, we recorded the occurrence, duration, and escalation of induced contests between males located in webs of females that differed in reproductive status (estimated by female life stage), fecundity (estimated by female abdominal area), and spatial distribution (i.e., isolated or aggregated with webs of other females). The occurrence and duration of contests were unrelated to female value or search costs. However, the probability for escalation was higher when males were fighting for adult (and probably mated) females. We also found that males tended to start a contest more often in aggregated webs. These results indicate that males of T. clavipes adjust investment in contests but contrarily to what we expected. We suggest that males invest more in contests for adult females because they are defending females that they previously fertilized to avoid sperm competition.

show abstract

Strong first sperm precedence in the freshwater hermaphroditic snail Planorbella trivolvis

Cited by 4 publications

References 39 publications

Histopathological Analysis of Faunus Ater Ovotestis in Bale and Reuleueng Rivers, Aceh Besar Regency, Aceh Province Indonesia

Histopathological Analysis of Faunus Ater Ovotestis in Bale and Reuleueng Rivers, Aceh Besar Regency, Aceh Province Indonesia

Fertility signalling games: should males obey the signal?

Web wars: males of the golden orb-web spider invest more in fights for mated females

Contact Info

Product

Resources

About