1 The Maternal-Embryonic Relationship in Viviparous Fishes

Wourms, John P.; Grove, Bryon; Lombardi, Julian

doi:10.1016/s1546-5098(08)60213-7

Cited by 221 publications

(371 citation statements)

References 142 publications

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“…Maternal investment in matrotrophic species is measured as the ratio of weight of the embryo at birth to the weight of the fertilized egg [29,30]. This ratio is very high in goodeids [31], indicating that embryos grow throughout the gestation period.…”

Section: Discussionmentioning

confidence: 99%

Foraging costs drive female resistance to a sensory trap

Garcı́a

Lemus

2012

Proc. R. Soc. B.

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Male ornaments can evolve through the exploitation of female perceptual biases such as those involved in responding to cues from food. This type of sensory exploitation may lead to confusion between the male signals and the cues that females use to find/recognize food. Such interference would be costly to females and may be one reason why females evolve resistance to the male ornaments. Using a group of species of viviparous fish where resistance to a sensory trap has evolved, we demonstrate that females exposed to an ornament that resembles food have a diminished foraging efficiency, that this effect is apparent when foraging on a food item with which the ornament shares visual attributes, and that not all species are equally affected by such confusion. Our results lend support to the model of ornamental evolution through chase-away sexual conflict.

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Section: Discussionmentioning

confidence: 99%

Foraging costs drive female resistance to a sensory trap

Garcı́a

Lemus

2012

Proc. R. Soc. B.

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“…While these differences determine the terminology of the female reproductive system, embryogenesis basically does not differ among species; most of the differences are related to the degree of development of the embryos at the time of parturition. Embryos can be released in a very early stage (i.e., zygoparity; Wourms et al 1988) as occurs in the blackbelly rosefish Helicolenus dactylopterus (White et al 1998;Muñoz et al 2002) The six stages of embryonic development are defined as subphases of the gestation phase. The initial subphase of gestation is fertilization, which is initiated when the oocyte is ovulated into the lumen of the ovary or into the uterus and internal fertilization takes place.…”

Section: Alternate Reproductive Strategiesmentioning

confidence: 99%

“…), the occurrence of this subphase indicates immediate parturition (Bowers 1992;Saborido-Rey 1994); larval metamorphosis occurs outside the body of the mother. In matrotrophic species, however, the embryos may develop further due to nourishment taken through oophagy or adelphophagy or taken directly from the mother (Wourms et al 1988;Wourms and Lombardi 1992); embryogenesis is completed during metamorphosis, and juvenile fish are released from the mother. In all cases, parturition is the final event of the gestation phase.…”

Section: Alternate Reproductive Strategiesmentioning

confidence: 99%

Spawning Aggregation of Beardfish, Polymixia lowei, in a Deep-water Sinkhole off the Florida Keys

Baumberger¹,

Brown‐Peterson²,

Reed³

et al. 2010

Copeia

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“…zygotes) are retained within the female reproductive tract for short periods of time before being released into the marine environment (Wourms et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

Spermiogenesis particularities of a sperm storage species: <i>Helicolenus dactylopterus</i> (Teleostei: Scorpaenidae)

et al. 2010

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SUMMARY: A study of the spermiogenesis and spermatozoa of Helicolenus dactylopterus was conducted. Females of this species have the capacity to store sperm within their ovaries, and male gametes have a considerable cytoplasmic mass surrounding their heads to survive the long period of intraovarian sperm storage. Our observations show that early spermatids are round-shaped cells and have a spherical nucleus with diffuse chromatin. The nuclear volume decreases as a result of progressive chromatin condensation during spermiogenesis, causing the nucleus to take on a U-shape. Flagellar insertion is not central to the nucleus but consistently occurs at an oblique angle towards one side of it. The flagellum is inserted into the nuclear fossa, without subsequent nuclear rotation. In mature spermatozoa, the flagellum is adjacent to the nucleus. A comparison of the spermatozoa in the testicular lobules and those in the intraovarian storage structures suggests that the increase in volume of the cytoplasmic mass may occur in the posterior region of the testis, in the testicular duct. Spermatozoa enter the ovary in groups that reach the ovarian lumen and are surrounded by the ovarian epithelium for storage in sperm storage crypts.Keywords: Helicolenus dactylopterus, spermiogenesis, ultrastructure, sperm storage, spermatozoa. RESUMEN: Particularidades en la espermiogénesis de una especie que almacena esperma: Helicolenus dactylopterus dactylopterus (Teleostei: Scorpaenidae). -Se estudian la espermatogénesis y el espermatozoide de la especie Helicolenus dactylopterus. Las hembras de esta especie tienen la capacidad de almacenar espermatozoides en el interior de sus ovarios y los gametos masculinos presentan una evidente masa citoplasmática rodeando sus cabezas para soportar el largo período de almacenaje intraovárico. Nuestras observaciones evidencian que las espermátidas tempranas son células redondas con un núcleo esférico que contiene cromatina difusa. El volumen nuclear disminuye debido a una progresiva condensación de la cromatina, provocando que el núcleo adopte forma de "U". La inserción flagelar no es central respecto al núcleo sino que se realiza a un lado de éste, siempre de forma oblicua. El flagelo se inserta en la fosa nuclear y no existe rotación nuclear posterior. En los espermatozoides maduros, el flagelo es una estructura adyacente al núcleo. El aumento de volumen de las masas citoplasmáticas posiblemente ocurre en la región posterior del testículo, comparando los espermatozoides del interior del lóbulo testicular con los que están dentro las estructuras de almacenaje intraováricas. Éstos entran en el ovario en grupos más o menos organizados y son envueltos por el epitelio ovárico de la zona lamelar para ser guardados en criptas de almacenaje de esperma.Palabras clave: Helicolenus dactylopterus, espermiogenesis, ultra estructura, almacenaje esperma, espermatozoide.

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1 The Maternal-Embryonic Relationship in Viviparous Fishes

Cited by 221 publications

References 142 publications

Foraging costs drive female resistance to a sensory trap

Foraging costs drive female resistance to a sensory trap

Spawning Aggregation of Beardfish, Polymixia lowei, in a Deep-water Sinkhole off the Florida Keys

Spermiogenesis particularities of a sperm storage species: <i>Helicolenus dactylopterus</i> (Teleostei: Scorpaenidae)

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