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The Effects of Female Shell Size on Reproductive Potential of the Egg Capsule in Rapa Whelk Rapana venosa in Three Regions of Different Salinities.

Chung EY, Park KH, Lee CH, Park YJ - (2013)

Bottom Line: The number of egg capsules, egg capsule height, and fecundity associated with reproductive potential of larger female rapa whelks were higher than those of smaller individuals in all three regions.Correlation analyses showed that there is a significant positive correlation between egg capsule and female shell height.In the coastal zone of the Gwangyang Bay and the upper reaches of Seomjin River, the fecundity of this species was estimated to be approximately 182,000-1,302,000 eggs/ind./yr.

View Article: PubMed Central - PubMed

Affiliation: Department of Marine Biotechnology, Kunsan National University, Gunsan 573-701, Korea.

ABSTRACT
We investigated the effects of shell height on reproductive potential of the female Rapana venosa in three regions of different salinities (the coastal zone of the Gwangyang Bay (S-1); the upper reaches (S-3); lower reaches (S-2) of the Seomjin River). The number of egg capsules, egg capsule height, and fecundity associated with reproductive potential of larger female rapa whelks were higher than those of smaller individuals in all three regions. Correlation analyses showed that there is a significant positive correlation between egg capsule and female shell height. Mean of shell heights, egg capsule heights, the number of egg capsules in an egg mass, and fecundity in an egg capsule produced from female individuals inhabiting S-1 region were markedly higher than those inhabiting S-2 and S-3 regions. In particular, the fecundity of the rapa whelk increased with the salinity and shell height. Although large rapa whelks produced a large number of egg capsules at S-1 region, those at S-3 habitat laid less egg capsules with smaller size. If these rapa whelks were put into S-2 region, the number of egg capsules produced by a female at S-2 region was slightly larger than those produced by a female at S-3 region. This provides a clear evidence that the number of the egg capsules can be controlled by the salinity. In the coastal zone of the Gwangyang Bay and the upper reaches of Seomjin River, the fecundity of this species was estimated to be approximately 182,000-1,302,000 eggs/ind./yr.

No MeSH data available.


Correlations between shell height and the egg capsule height according to salinity concentrations in three regions (S-1, S-2, S-3).
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Figure 5: Correlations between shell height and the egg capsule height according to salinity concentrations in three regions (S-1, S-2, S-3).

Mentions: Egg capsule height in relation to female shell height was described using a linear regression equation. And correlations between variables were confirmed by the calculation of Pearson's correlation coefficient (r). In S-1, the egg capsule height = 0.088 SH + 1.819, R2 = 0.964 (Fig. 5, S-1). Pearson's correlation coefficient r = 0.982 (Table 2). Therefore, there is a significant positive correlation between Egg capsule height and female shell height. In S-2, the egg capsule height = 0.089 SH + 1.530, R2 = 0.770 (Fig. 5, S-2). Pearson's correlation coefficient r = 0.878 (Table 3). Therefore, there is a significant positive correlation between Egg capsule height and female shell height. In S-3, the egg capsule height = 0.009 SH + 1.261, R2 = 0.057 (Fig. 5, S-3). Pearson's correlation coefficient r = 0239 (Table 4). Therefore, there is no significant correlation between egg capsule height and female shell height.


The Effects of Female Shell Size on Reproductive Potential of the Egg Capsule in Rapa Whelk Rapana venosa in Three Regions of Different Salinities.

Chung EY, Park KH, Lee CH, Park YJ - (2013)

Correlations between shell height and the egg capsule height according to salinity concentrations in three regions (S-1, S-2, S-3).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4282219&req=5

Figure 5: Correlations between shell height and the egg capsule height according to salinity concentrations in three regions (S-1, S-2, S-3).
Mentions: Egg capsule height in relation to female shell height was described using a linear regression equation. And correlations between variables were confirmed by the calculation of Pearson's correlation coefficient (r). In S-1, the egg capsule height = 0.088 SH + 1.819, R2 = 0.964 (Fig. 5, S-1). Pearson's correlation coefficient r = 0.982 (Table 2). Therefore, there is a significant positive correlation between Egg capsule height and female shell height. In S-2, the egg capsule height = 0.089 SH + 1.530, R2 = 0.770 (Fig. 5, S-2). Pearson's correlation coefficient r = 0.878 (Table 3). Therefore, there is a significant positive correlation between Egg capsule height and female shell height. In S-3, the egg capsule height = 0.009 SH + 1.261, R2 = 0.057 (Fig. 5, S-3). Pearson's correlation coefficient r = 0239 (Table 4). Therefore, there is no significant correlation between egg capsule height and female shell height.

Bottom Line: The number of egg capsules, egg capsule height, and fecundity associated with reproductive potential of larger female rapa whelks were higher than those of smaller individuals in all three regions.Correlation analyses showed that there is a significant positive correlation between egg capsule and female shell height.In the coastal zone of the Gwangyang Bay and the upper reaches of Seomjin River, the fecundity of this species was estimated to be approximately 182,000-1,302,000 eggs/ind./yr.

View Article: PubMed Central - PubMed

Affiliation: Department of Marine Biotechnology, Kunsan National University, Gunsan 573-701, Korea.

ABSTRACT
We investigated the effects of shell height on reproductive potential of the female Rapana venosa in three regions of different salinities (the coastal zone of the Gwangyang Bay (S-1); the upper reaches (S-3); lower reaches (S-2) of the Seomjin River). The number of egg capsules, egg capsule height, and fecundity associated with reproductive potential of larger female rapa whelks were higher than those of smaller individuals in all three regions. Correlation analyses showed that there is a significant positive correlation between egg capsule and female shell height. Mean of shell heights, egg capsule heights, the number of egg capsules in an egg mass, and fecundity in an egg capsule produced from female individuals inhabiting S-1 region were markedly higher than those inhabiting S-2 and S-3 regions. In particular, the fecundity of the rapa whelk increased with the salinity and shell height. Although large rapa whelks produced a large number of egg capsules at S-1 region, those at S-3 habitat laid less egg capsules with smaller size. If these rapa whelks were put into S-2 region, the number of egg capsules produced by a female at S-2 region was slightly larger than those produced by a female at S-3 region. This provides a clear evidence that the number of the egg capsules can be controlled by the salinity. In the coastal zone of the Gwangyang Bay and the upper reaches of Seomjin River, the fecundity of this species was estimated to be approximately 182,000-1,302,000 eggs/ind./yr.

No MeSH data available.