Successful Propagation in Seawater of the Guppy &lt;i&gt;Poecilia reticulta&lt;/i&gt; wity Reference to High Salinity Tolerance at Birth

Shikano, Takahito; Fujio, Yoshihisa

doi:10.2331/fishsci.63.573

Cited by 29 publications

(14 citation statements)

References 7 publications

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“…As a model organism for genetic analysis in fish, the guppy Poecilia reticulata is one of the most useful teleosts because of its short life cycle, ease of breeding and the establishment of many strains. 5,12,13 These strains have various kinships and various characteristics in terms of morphological and physiological traits. Salinity tolerance is one of the most important physiological traits in fish.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on strain combinations in heterosis in salinity tolerance of the guppy Poecilia reticulata

2000

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SUMMARY: As an experimental model of heterosis in fish, the present study examined the amount of heterosis in salinity tolerance in four crosses between guppy strains having various kinships. Salinity tolerance was measured as survival time after transfer from fresh water to 35 ppt seawater. The amount of heterosis, expressed by the difference between the means of the parents and their F1 hybrids in every pair, was larger in the strain combinations having distant kinship than in those having close kinship. The result indicates that the average amount of heterosis is dependent on the magnitude of kinship between the strains. The average survival times of the F1 hybrids did not correlate with those of female parents, male parents, or mid‐parent values but correlated closely with the average amount of heterosis in the four strain combinations, indicating that the average phenotypic value of the F1 hybrids is not influenced by that of their parents but is dependent on the average amount of heterosis brought by the strain combination. Within each strain combination, variance in the amount of heterosis among pairs was larger in the strain combinations having close kinship than in those having distant kinship. These results indicate that the amount of heterosis was larger and more uniform in the strain combinations having distant kinship than in those having close kinship. The present study experimentally demonstrates that the strain combination having distant kinship is more useful for genetic improvement utilizing heterosis in fish.

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Section: Introductionmentioning

confidence: 99%

An experimental study on strain combinations in heterosis in salinity tolerance of the guppy Poecilia reticulata

2000

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“…Indeed, empirical studies often find that community composition changes significantly along salinity gradients (Martin, ; Gelwick et al ., ; Jaureguizar et al ., ; Fuller, McGhee & Schrader, ). However, these predictions do not necessarily extend to poeciliid fishes, which are considered to be euryhaline (Rosen & Bailey, ), and several species, including P. reticulata , show tolerance to gradual changes in salinity (Gibson & Hirst, ; Zimmerer, ; Shikano & Fujio, ). Thus, the abrupt limit to the distribution of this species at the brackish–freshwater interface was unexpected.…”

Section: Discussionmentioning

confidence: 99%

Ecological correlates of the distribution limits of two poeciliid species along a salinity gradient

Torres‐Dowdall

Dargent

Handelsman

et al. 2013

Biol J Linn Soc Lond

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Identifying the environmental factors responsible for the formation of a species' distribution limit is challenging because organisms interact in complex ways with their environments. However, the use of statistical niche models in combination with the analysis of phenotypic variation along environmental gradients can help to reduce such complexity and identify a subset of candidate factors. In the present study, we used such approaches to describe and identify factors responsible for the parapatric distribution of two closely‐related livebearer fish species along a salinity gradient in the lowlands of Trinidad, West Indies. The downstream distribution limits of Poecilia reticulata were strongly correlated with the brackish–freshwater interface. We did not observe significant phenotypic variation in life‐history traits for this species when comparing marginal with more central populations, suggesting that abrupt changes in conditions at the brackish–freshwater interface limit its distribution. By contrast, Poecilia picta was present across a wide range of salinities, although it gradually disappeared from upstream freshwater localities. In addition, P. picta populations exhibited an increase in offspring size in localities where they coexist with P. reticulata, suggesting a role for interspecific competition. The parapatric distribution of these two species, suggests that P. reticulata distributions are limited by an abiotic factor (salinity), whereas P. picta is limited by a biotic factor (interspecific competition). Similar parapatric patterns have been previously described in other systems, suggesting they might be a common pattern in nature. © 2013 The Linnean Society of London

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“…The guppy is a good model fish for genetic studies con cerning salinity tolerance because of its short life cycle, the establishment of many strains, 14,15) and high euryhalinity similar to salmonids. Shikano and Fujio16,17) demonstrated that salinity tolerance and seawater adaptability significant ly differed among the strains, suggesting the importance of genetic factors for salinity tolerance and seawater adaptability.…”

Section: Osmoregulationmentioning

confidence: 99%

Seawater Adaptability, Osmoregulatory Function, and Branchial Chloride Cells in the Strain Selected for High Salinity Tolerance of the Guppy <i>Poecilia reticulata</i>

1998

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Seawater adaptability, osmoregulatory function, and branchial chloride cells were compared be tween the original strain (S3) and the selected strain for high salinity tolerance (S3-SR3) of the guppy. Survival time in 35 ppt seawater was significantly longer in the S3-SR3 strain than in the S3 strain, in dicating the higher salinity tolerance of the S3-SR3 strain. When fish were acclimated to 15 ppt dilute seawater, LD50 (ppt) of the S3 and S3-SR3 strains gradually and significantly increased with increase in the acclimation periods in parallel, and the S3-SR3 strain acquired seawater adaptability earlier than the S3 strain. Blood osmotic pressure after direct transfer to 15 ppt dilute seawater of the S3 strain sig nificantly increased 1 day and 2 days after the transfer while that of the S3-SR3 strain did not significant ly increase throughout the experiment. Branchial chloride cells of the S3-SR3 strain increased about 50% in number and about 15% in size in comparison with those of the S3 strain in fresh water. These results suggest that genetic increase in the number and size of branchial chloride cells in the S3-SR3 strain caused the improvements of salinity tolerance, seawater adaptability, and osmoregulatory func tion.

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Successful Propagation in Seawater of the Guppy <i>Poecilia reticulta</i> wity Reference to High Salinity Tolerance at Birth

Cited by 29 publications

References 7 publications

An experimental study on strain combinations in heterosis in salinity tolerance of the guppy Poecilia reticulata

An experimental study on strain combinations in heterosis in salinity tolerance of the guppy Poecilia reticulata

Ecological correlates of the distribution limits of two poeciliid species along a salinity gradient

Seawater Adaptability, Osmoregulatory Function, and Branchial Chloride Cells in the Strain Selected for High Salinity Tolerance of the Guppy <i>Poecilia reticulata</i>

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