Ionic and osmotic environment of developing elasmobranch embryos

Kormanik, Gregg A.

doi:10.1007/978-94-017-3450-9_21

Cited by 22 publications

(30 citation statements)

References 27 publications

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“…Additionally, later in development, many lamnoid embryos go through a period of substantially reduced growth and metabolism (Gilmore et al 2005), which also may affect the isotope fractionation. perturbations in nitrogen homeostasis during pregnancy (Fuller et al 2004), differences in protein utilization during development (Needham and Needham 1930), the onset of fetal urea production for osmotic balance during late gestation (Kormanik andEvans 1986, Kormanik 1993), or migration-related shifts in isotopic values (Best and Schell 1996) associated with maternal movement to habitat that is consistently depleted in 15 N and enriched in 13 C (Boustany et al 2002, Bonfil et al 2005. 3.…”

Section: Discussionmentioning

confidence: 99%

Use of Isotopic Analysis of Vertebrae in Reconstructing Ontogenetic Feeding Ecology in White Sharks

Estrada¹,

Rice²,

Natanson³

et al. 2006

Ecology

193

166

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We conducted stable 13C and 15N analysis on white shark vertebrae and demonstrated that incremental analysis of isotopes along the radius of a vertebral centrum produces a chronological record of dietary information, allowing for reconstruction of an individual's trophic history. Isotopic data showed significant enrichments in 15N with increasing sampling distance from the centrum center, indicating a correlation between body size and trophic level. Additionally, isotopic values verified two distinct ontogenetic trophic shifts in the white shark: one following parturition, marking a dietary switch from yolk to fish; and one at a total length of >341 cm, representing a known diet shift from fish to marine mammals. Retrospective trophic-level reconstruction using vertebral tissue will have broad applications in future studies on the ecology of threatened, endangered, or extinct species to determine life-long feeding patterns, which would be impossible through other methods.

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Section: Discussionmentioning

confidence: 99%

Use of Isotopic Analysis of Vertebrae in Reconstructing Ontogenetic Feeding Ecology in White Sharks

Estrada¹,

Rice²,

Natanson³

et al. 2006

Ecology

193

166

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“…Even though follicles were intergland and lay them in muddy or sandy areas where they adhere to small pieces of rock, shell or seaweed. This egg case constitutes the only protection against pathogens or predators (Kormanik, 1993).…”

Section: Macroscopic Description Of the Ovarymentioning

confidence: 99%

The ovary of the bignose fanskate Sympterygia acuta Garman, 1877 (Chondrichthyes, Rajidae) in the Bahía Blanca estuary, Argentina: morphology and reproductive features

Galíndez

Estecondo

2009

Braz. J. Biol.

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Chondrichthyes have become an important economic resource in recent years. In spite of this importance, there is little knowledge about their reproductive biology, especially of species from the south-western Atlantic. In this work, we study the morphology and histology of the ovary of Sympterygia acuta. The results show that oogonia were present only in the immature females (stage I of maturity scale), whereas specimens in stages II and III of maturity displayed oocytes in all developmental steps. The most important histological features that vary throughout oocyte development are the presence or absence of yolk, the number of types and layers of follicular cells and the degree of development of the thecae. Follicular cells are, at least, of two different types. Finally, a new point of view for the determination of maturity stages in the field based on the size of follicles is discussed.

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“…This closely resembles the embryonic development of Sphaeroma serratum. Early stages of development of Squalus acanthias are incapable of osmoregulation and the uterus thus offers an osmotic protection during the progressive development of osmoregulatory effector organs including kidneys, rectal glands and osmoregulatory epithelia on branchial arches (Kormanik 1993). Convergence is thus particu.larly apparent in the solution of similar physiological and ontogenetical problems in 2 widely separated phyla.…”

Section: Function Of Incubating Pouchesmentioning

confidence: 99%

Ontogeny of osmoregulation and salinity tolerance in the isopod crustacean Sphaeroma serratum

Charmantier¹,

Charmantier‐Daures²

1994

Mar. Ecol. Prog. Ser.

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Osmoregulation was studied in embryos, juveniles and adults of the isopod Sphaeroma serratum (Fabricius. 1787). Salinity tolerance was studied in juveniles and adults. Juveniles and adults were euryhaline. Salinity tolerance was wide at birth in stage I juveniles and it increased up to a maximum in stage IV and adults. The lower and upper lethal salinities for 50% of the animals (96 h LSSo) at 20°C varied from about 13%0 and 59%0, respectively, in stage I, to about 2% and 74%0, respectively, in stage IV and in adults. Early and late embryos had, respectively, no or weak osmoregulatory capabilities. They were isosmotic and slightly hyperosmotic to the fluid of the incubating pouches in which they developed. The adult type of osmoregulation was partly present in stage I juveniles and was fully acquired at stage 11. The osmoregulatory capacity increased in the following stages and the adult osmoregulatory efficiency was established in stage IV. In juveniles and adults, osmoregulation and salinity tolerance appeared to be correlated. The ability of S. serratum to live in a habitat subjected to large variations of salinity is achieved through 2 sequential adaptations: (1) embryos, which develop in incubating pouches, are protected in them against osmotic stress; and (2) juveniles are able to hyperregulate at birth and, therefore, after birth, all stages are euryhaline.

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Ionic and osmotic environment of developing elasmobranch embryos

Cited by 22 publications

References 27 publications

Use of Isotopic Analysis of Vertebrae in Reconstructing Ontogenetic Feeding Ecology in White Sharks

Use of Isotopic Analysis of Vertebrae in Reconstructing Ontogenetic Feeding Ecology in White Sharks

The ovary of the bignose fanskate Sympterygia acuta Garman, 1877 (Chondrichthyes, Rajidae) in the Bahía Blanca estuary, Argentina: morphology and reproductive features

Ontogeny of osmoregulation and salinity tolerance in the isopod crustacean Sphaeroma serratum

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