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Family Growth and Survival Response to Two Simulated Water Temperature Environments in the Sea Urchin Strongylocentrotus intermedius

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ABSTRACT

Heat tolerance is a target trait in the selective breeding of the sea urchin Strongylocentrotus intermedius, as it plays an important role in the survival and growth of cultured S. intermedius during summer. We investigated family growth and survival response to two temperature treatments to evaluate the genotype by temperature interaction (GEI) in the family selection of S. intermedius. Sea urchins from 11 families were exposed to two simulated water temperature environments—high temperature (HE) and control temperature (CE)—for 12 months, with each experiment divided into four periods (P1, stress-free period I; P2, stress-full high period; P3, stress-response period; and P4, stress-free period II) based on the temperature changes and the survival. Test diameter (TD), body weight (BW), and survival rate (SR) in HE and CE were measured monthly. Effects of family, temperature, and family-temperature interaction on TD, BW, SR, and specific growth rate (SGR) for BW were examined. In CE, BW differed significantly between families in P2, P3, and P4, while TD differed significantly between families in P3 and P4 (p < 0.05). In HE, family had significant effects on BW in P4, and on TD in P3 and P4, while temperature had significant effects on SR, TD, and BW in P3 and P4 (p < 0.05). GEI effects were not significant for TD or BW; however, family ranking changes revealed the existence of GEI in SR. The GEI results indicate the necessity of applying family selection in CE and HE for SR, but not for TD or BW. These results may provide a guide for aquaculture and selective breeding of S. intermedius under temperature pressure.

No MeSH data available.


Ranking of families for body weight in high temperature and control temperature environments. The histogram bar indicates mean and standard error in each separate family. In each environment, lower-case letters (a,b,c,d,e) indicate significant differences between families (p < 0.05), and upper-case letters (X,Y) indicate significant differences between environments (p < 0.05).
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ijms-17-01356-f002: Ranking of families for body weight in high temperature and control temperature environments. The histogram bar indicates mean and standard error in each separate family. In each environment, lower-case letters (a,b,c,d,e) indicate significant differences between families (p < 0.05), and upper-case letters (X,Y) indicate significant differences between environments (p < 0.05).

Mentions: Family had no significant effect on growth traits (TD and BW) in HE and CE (Figure 1 and Figure 2) during P1. In addition, temperature had no significant effect on growth traits in each family. Moreover, the GEI (family × temperature) had no significant effect on growth traits (Table 3). For the variance components of variables, the proportion of variance explained by family were low for TD and BW (1.564% and 1.782%, respectively). The proportion of variance explained by temperature for TD and BW were 0.137% and zero, respectively. The proportion of variance explained by GEI for both growth traits were zero. There was no mortality in either of the simulated environments during this period.


Family Growth and Survival Response to Two Simulated Water Temperature Environments in the Sea Urchin Strongylocentrotus intermedius
Ranking of families for body weight in high temperature and control temperature environments. The histogram bar indicates mean and standard error in each separate family. In each environment, lower-case letters (a,b,c,d,e) indicate significant differences between families (p < 0.05), and upper-case letters (X,Y) indicate significant differences between environments (p < 0.05).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5037655&req=5

ijms-17-01356-f002: Ranking of families for body weight in high temperature and control temperature environments. The histogram bar indicates mean and standard error in each separate family. In each environment, lower-case letters (a,b,c,d,e) indicate significant differences between families (p < 0.05), and upper-case letters (X,Y) indicate significant differences between environments (p < 0.05).
Mentions: Family had no significant effect on growth traits (TD and BW) in HE and CE (Figure 1 and Figure 2) during P1. In addition, temperature had no significant effect on growth traits in each family. Moreover, the GEI (family × temperature) had no significant effect on growth traits (Table 3). For the variance components of variables, the proportion of variance explained by family were low for TD and BW (1.564% and 1.782%, respectively). The proportion of variance explained by temperature for TD and BW were 0.137% and zero, respectively. The proportion of variance explained by GEI for both growth traits were zero. There was no mortality in either of the simulated environments during this period.

View Article: PubMed Central - PubMed

ABSTRACT

Heat tolerance is a target trait in the selective breeding of the sea urchin Strongylocentrotus intermedius, as it plays an important role in the survival and growth of cultured S. intermedius during summer. We investigated family growth and survival response to two temperature treatments to evaluate the genotype by temperature interaction (GEI) in the family selection of S. intermedius. Sea urchins from 11 families were exposed to two simulated water temperature environments&mdash;high temperature (HE) and control temperature (CE)&mdash;for 12 months, with each experiment divided into four periods (P1, stress-free period I; P2, stress-full high period; P3, stress-response period; and P4, stress-free period II) based on the temperature changes and the survival. Test diameter (TD), body weight (BW), and survival rate (SR) in HE and CE were measured monthly. Effects of family, temperature, and family-temperature interaction on TD, BW, SR, and specific growth rate (SGR) for BW were examined. In CE, BW differed significantly between families in P2, P3, and P4, while TD differed significantly between families in P3 and P4 (p &lt; 0.05). In HE, family had significant effects on BW in P4, and on TD in P3 and P4, while temperature had significant effects on SR, TD, and BW in P3 and P4 (p &lt; 0.05). GEI effects were not significant for TD or BW; however, family ranking changes revealed the existence of GEI in SR. The GEI results indicate the necessity of applying family selection in CE and HE for SR, but not for TD or BW. These results may provide a guide for aquaculture and selective breeding of S. intermedius under temperature pressure.

No MeSH data available.