Temperature Sensitivity of a Hybrid between Two Species of Sea Urchin Differing in Thermotolerance

Fujisawa, Hironori

doi:10.1111/j.1440-169x.1993.00395.x

Cited by 19 publications

(13 citation statements)

References 33 publications

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“…• C) underwent normal development, although the development time varied at different temperatures, which is in line with the findings of others (Matsumoto et al 1988;Fujisawa 1993). The synchronized or asynchronized development of larvae is another point to be considered in order to understand the mode of development (Rahman et al 2007).…”

Section: Discussionsupporting

confidence: 86%

Effects of temperature on hatching rate, embryonic development and early larval survival of the edible sea urchin, Tripneustes gratilla

2009

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Abstract:The temperature tolerances of embryonic and early larval development stages of Tripneustes gratilla were investigated from 13-34• C under laboratory conditions. Zygotes showed unequal cleavage at 13• C, whereas cleavage did not occurred at 34 • C, respectively. Outside of this temperature range, embryos showed abnormality at different incubation times. Early larvae of this species have the ability to survive the higher temperature limit for short periods of time. Prism and 2 arm pluteus larvae survived at temperatures between 30 and 33• C, whereas 4 arm pluteus larvae survived at temperatures between 30 and 36• C for 2 h. These results suggest that the larval temperature tolerance capability of T. gratilla is stage dependent. These findings are important for understanding the life history strategy of this sea urchin in the shallow open water environment.

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Section: Discussionsupporting

confidence: 86%

Effects of temperature on hatching rate, embryonic development and early larval survival of the edible sea urchin, Tripneustes gratilla

2009

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“…The findings of our study were also the same as Rahman et al (2007), who found abnormality in the early development and larval growth of sea urchin (Echinometra mathaei) beyond the low (16 o C) and high temperature (34 o C) levels. Similar results were also observed in other temperate and tropical species of Indo-Pacific sea urchins (Matsumoto et al, 1988;Fujisawa, 1993;Sarifudin et al, 2016).…”

Section: Discussionsupporting

confidence: 83%

“…Observations were also made at every 30 min interval. The time taken for 50% of the embryo and larva to reach each progressive stage was recorded (Fujisawa, 1993;Rahman et al, 2002). Development stage(s) were assessed for the first 50 embryos observed under a compound light microscope at 10x magnification.…”

Section: Early Developmentmentioning

confidence: 99%

Influence of temperature variation on embryonic and early larval development of a commercially important tropical sea urchin Tripneustes gratilla (Linnaeus, 1758)

et al. 2018

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The present study investigated the influence of different temperature levels (16, 19, 22, 25, 28, 31 and 34 o C) on embryonic and early larval development of the tropical sea urchin, Tripneustes gratilla (Linnaeus, 1758) in a controlled laboratory condition. The critical lower and higher temperature for embryonic development was found to be 16 and 34 o C, respectively. Embryos reared in these temperatures exhibited 100% abnormality within 48 h post-insemination. The time required to reach embryonic and larval stages was increased with temperature from 28 o C followed by 31, 25, 22 and 19 o C. The developmental time of 2-cell to 4-arm pluteus larvae showed significant (p<0.05) differences. The survival (%) of larvae at the prism, 2-arm and 4-arm stages were observed as dissimilar from 22 to 34 o C, and the highest values (100% or near 100%) were found at 25 and 28 o C. The morphometric measurements from prism to 4-arm pluteus larvae at different temperatures differed significantly (p<0.05). However among the temperatures evaluated, 28 o C was found as the best temperature for better growth and development of larvae at all stages. The findings of the study would help to develop captive breeding and seed production programmes for commercial aquaculture of the species.

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“…Some reports indicated that sympatric echinoid species are isolated by prezygotic isolating barriers including differences in microhabitats, breeding seasons (Lessios 2007), environmental conditions like temperature (Fujisawa 1993) and alkalinity (Tennent 1910). On the coasts of Yamaguchi area, we can find the adults of the temnopleurids, and we made field survey over 10 years.…”

Section: Discussionmentioning

confidence: 99%

“…In other hand, Onoda (1938) formed hybrids between 10 different species representing 2 orders, 6 families and 10 genera and indicated that in hybrid skeletogenesis the maternal influence is generally stronger than the paternal one. It was also reported that the thermotolerance depends on the egg cytoplasm in hybrids of a dendrasterid Dendraster excentricus (Eschscholtz, 1831) and S. purpuratus (Fujisawa 1993). Additionally, tropical echinometrids, Echinometra mathaei (Blainville, 1825) and E. oblonga (Blainville, 1825) or E. sp.…”

Section: Introductionmentioning

confidence: 97%

<p class="HeadingRunIn"><strong>Experimental hybridization of sympatric temnopleurid sea urchins living in Yamaguchi, Japan</strong></p>

2019

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Three sympatric species of temnopleurid sea urchins, Temopleurus toreumaticus (Leske, 1778), T. hardwickii (Gray, 1855) and Mespilia globulus (Linnaeus, 1758), occupy a habitat located a short distance from the shore of the Seto Inland Sea, Yamaguchi Prefecture, Japan. Breeding seasons overlap considerably among these species. These species exhibit species-specific differences in embryonic and larval development such as a wrinkled zygote, wrinkled blastula, archenteron invagination, larval skeleton and juvenile morphology. In this study, we determined whether interbreeding among these species is possible. Investigations revealed that fertilization succeeded with all mating combination patterns and that all fertilized eggs developed to the gastrula stage. The blastula and gastrula of hybrids formed in a manner similar to the maternal whereas the developmental delay observed followed the pattern of the paternal species T. toreumaticus fertilized at a greater proportion than other pairs and metamorphosed. These results suggest that eggs of this species may have weaker fertilization block in general. At the early developmental stages, hybrid embryos from T. toreumaticus mothers express maternal, while some hybrids derived from sperm of T. toreumaticus and the eggs of other species ceased development at the 4-armed larval stage. The hybrids of T. hardwickii and M. globulus ceased development at the gastrula stage, suggesting that these species have a greater degree of genetically isolation distance. In hybrids of T. toreumaticus and strongylocentrotid Hemicentrotus pulcherrimus (A. Agassiz, 1864), larval skeletons expressed features from both species. These results suggest that traits of hybrids are derived not only from one or both original species, but that a mosaic effect can be obtained depending on the traits. These results indicate that temnopleurids have the weaker fertilization block mechanisms. Isozyme analyses showed that hybrid prisms of T. toreumaticus eggs and M. globulus sperm possess enzymatic patterns of malate dehydrogenase derived from each parent, whereas the enzymatic pattern of glucose-6-phosphate dehydrogenase is derived from eggs, suggesting that malate dehydrogenase activity may be useful in detecting naturally occurring adult hybrids among these species in the Yamaguchi coastal area.

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Temperature Sensitivity of a Hybrid between Two Species of Sea Urchin Differing in Thermotolerance

Cited by 19 publications

References 33 publications

Effects of temperature on hatching rate, embryonic development and early larval survival of the edible sea urchin, Tripneustes gratilla

Effects of temperature on hatching rate, embryonic development and early larval survival of the edible sea urchin, Tripneustes gratilla

Influence of temperature variation on embryonic and early larval development of a commercially important tropical sea urchin Tripneustes gratilla (Linnaeus, 1758)

<p class="HeadingRunIn"><strong>Experimental hybridization of sympatric temnopleurid sea urchins living in Yamaguchi, Japan</strong></p>

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