Gonadal morphology in the self-fertilizing mangrove killifish, Kryptolebias marmoratus

Sakakura, Yoshitaka; Soyano, Kiyoshi; Noakes, David L. G.; Hagiwara, Atsushi

doi:10.1007/s10228-006-0362-2

Cited by 47 publications

(31 citation statements)

References 17 publications

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“…Maintaining ovarian tissue has negative impacts on individual survival, growth, immunocompetence and future reproductive efforts (Bergeron et al, 2011;. Hermaphroditic rivulus must maintain both ovarian and testicular tissues while males only need to maintain testicular tissue (Cole and Noakes, 1997;Sakakura et al, 2006). Our findings suggest that higher maximum metabolic rates in hermaphrodites might support energetically expensive activities (e.g.…”

Section: Discussionmentioning

confidence: 82%

“…The ovotestis is also about twice as large as the male testis. Thus, hermaphrodites have the energetically expensive task of maintaining larger, more complex gonads (both ovarian and testicular tissues) relative to males, which maintain small, less complex gonads (testicular tissue only; Cole and Noakes, 1997;Sakakura et al, 2006). We thus predicted that maintaining both ovarian and testicular tissues should require hermaphrodites to have elevated metabolic rates compared with males.…”

Section: Introductionmentioning

confidence: 99%

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Phenotypic differences between the sexes in the sexually plastic mangrove rivulus fish (Kryptolebias marmoratus)

Garcia

Ferro

Mattox

et al. 2016

Journal of Experimental Biology

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To maximize reproductive success, many animal species have evolved functional sex change. Theory predicts that transitions between sexes should occur when the fitness payoff of the current sex is exceeded by the fitness payoff of the opposite sex. We examined phenotypic differences between the sexes in a sexchanging vertebrate, the mangrove rivulus fish (Kryptolebias marmoratus), to elucidate potential factors that might drive the 'decision' to switch sex. Rivulus populations consist of self-fertilizing hermaphrodites and males. Hermaphrodites transition into males under certain environmental conditions, affording us the opportunity to generate 40 hermaphrodite-male pairs where, within a pair, individuals possessed identical genotypes despite being different sexes. We quantified steroid hormone levels, behavior (aggression and risk taking), metabolism and morphology (organ masses). We found that hermaphrodites were more aggressive and risk averse, and had higher maximum metabolic rates and larger gonadosomatic indices. Males had higher steroid hormone levels and showed correlations among hormones that hermaphrodites lacked. Males also had greater total mass and somatic body mass and possessed considerable fat stores. Our findings suggest that there are major differences between the sexes in energy allocation, with hermaphrodites exhibiting elevated maximum metabolic rates, and showing evidence of favoring investments in reproductive tissues over somatic growth. Our study serves as the foundation for future research investigating how environmental challenges affect both physiology and reproductive investment and, ultimately, how these changes dictate the transition between sexes.

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Section: Discussionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Phenotypic differences between the sexes in the sexually plastic mangrove rivulus fish (Kryptolebias marmoratus)

Garcia

Ferro

Mattox

et al. 2016

Journal of Experimental Biology

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“…These fish produce sperm and eggs by meiosis and reproduce routinely by selffertilization. Each hermaphroditic individual normally fertilizes itself when a sperm and egg that it has produced by an internal organ unite inside the fish's body (Sakakura et al, 2006; for review see Avise, 2008). In this highly inbred hermaphroditic species meiotic recombination does not produce significant allelic variation, suggesting that meiosis is retained for some other adaptive benefit.…”

Section: Dna Repair 368mentioning

confidence: 99%

Meiosis as an Evolutionary Adaptation for DNA Repair

Bernstein¹,

Bernstein²,

Michod³

2011

DNA Repair

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“…K. marmoratus hermaphrodites oviposit all year during day light hours, usually at midday; eggs can be laid at varying developmental stages due to intra-parental development (Harrington, 1963;Koenig and Chasar, 1984). It is difficult to assess the exact fertilization time of K. marmoratus embryos, as ovulated eggs are fertilized within the gonadal lumen (Sakakura et al, 2006). Thus, all timings expressed as hours post fertilization are back-calculated estimations based on previous literature (Koenig and Chasar, 1984;Grageda et al, 2005).…”

Section: Experimental Procedures Experimental Animalsmentioning

confidence: 99%

“…However, Tatarenkov et al (2009) recently demonstrated that a related nominal species, Kryptolebias ocellatus, is also capable of self-fertilization. Internal fertilization occurs in the gonadal lumen, containing both ovarian and testicular tissue, where spermatozoa are directly discharged (Sakakura et al, 2006). K. marmoratus are androdioecious, indicating that populations are composed of males and hermaphrodites (Tatarenkov et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Embryonic development of the self‐fertilizing mangrove killifish Kryptolebias marmoratus

Mourabit

Edenbrow

Croft

et al. 2011

Developmental Dynamics

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The mangrove killifish, Kryptolebias marmoratus, is a self-fertilizing vertebrate offering vast potential as a model species in many biological disciplines. Previous studies have defined developmental stages but lacked visual representations of the various embryonic structures. We offer detailed photographic images of K. marmoratus development with revised descriptions. An improved dechorionation method was developed to provide high resolution photographs, in addition to a microinjection technique enabling cell marking in the yolk syncytial layer. Embryos were also treated with PTU (1-phenyl 2-thiourea), an inhibitor of melanogenesis, to provide optical transparency revealing internal structures in late stages of development. Chemical exposures (PTU and retinoic acid) demonstrated that K. marmoratus embryos were sensitive to chemicals, illustrating further their usefulness in developmental biology studies. Our data suggest that K. marmoratus embryos are easily used and manipulated, supporting the use of this hermaphroditic vertebrate as a strong comparative model system in embryology, evolution, genetics, environmental and medical biology. Developmental Dynamics 240:1694-1704,

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Gonadal morphology in the self-fertilizing mangrove killifish, Kryptolebias marmoratus

Cited by 47 publications

References 17 publications

Phenotypic differences between the sexes in the sexually plastic mangrove rivulus fish (Kryptolebias marmoratus)

Phenotypic differences between the sexes in the sexually plastic mangrove rivulus fish (Kryptolebias marmoratus)

Meiosis as an Evolutionary Adaptation for DNA Repair

Embryonic development of the self‐fertilizing mangrove killifish Kryptolebias marmoratus

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