Corrigendum: Effect of live-storage period and temperature on oxygen consumption rate in the cold-water sea cucumber Parastichopus tremulus

A Corrigendum on
Effect of live-storage period and temperature on oxygen consumption rate in the cold-water sea cucumber Parastichopus tremulus

by Landes AM, Sunde J and Christophersen G (2023) Front. Mar. Sci. 10:1248840. doi: 10.3389/fmars.2023.1248840

In the published article, there was an error in Figure 1 and Figure 3 as well as in Table 1 and Table 2 as published. The authors discovered a continuous error throughout all calculations used to determine oxygen consumption rate (OCR) in Parastichopus tremulus. Instead of using oxygen partial pressure (as required), air pressure was erroneously used. Since air temperature was stable throughout the experiments, oxygen density in air followed the atmospheric pressure and the proportion remained the same throughout all measurements. Therefore, the overall relation between the OCR measured at different times and in different treatments remained the same, the statistical results still applied, and all general findings remained correct. In effect, only the scale (y-axis) had to be corrected in Figures 1 and 3. The corrected Figure 1 and Figure 3 and their captions appear below. In Tables 1 and 2, numerical values given for OCR had to be updated. The corrected Table 1 and Table 2 and their captions appear below.

Figure 1

Figure 1 Oxygen consumption rates (OCR) per hour and gram body wall dry weight in P. tremulus from three sampling groups (1-3) at different live-storage time in a flow-through seawater system (FT). Data are average ± SD of three consecutive measurements per sampling point. Different letters denote significant different values.

Figure 3

Figure 3 Oxygen consumption rates (OCR) per gram body wall dry weight and hour in P. tremulus at experimental start (T0), after 2 (T1) and 4 (T2) weeks live-storage at three different temperatures (4, 8 and 12°C). Data are average ± SD of three consecutive measurements per sampling point. Different letters denote significant different values.

Table 1

Table 1 Oxygen consumption rates (OCR) per group of three individuals are average ± SD of three consecutive measurements.

Table 2

Table 2 Oxygen consumption rate (OCR) per group of three individuals are average ± SD of three consecutive measurements.

The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way. The original article has been updated.

In the published article, there was an error. Due to the continuous calculation error mentioned above, the numerical values of oxygen consumption rates mentioned in the text were incorrect. The text itself remained unchanged.

A correction has been made to Results, 3.1 Effect of live-storage period, Paragraph 1. These two consecutive sentences previously stated:

“Weight specific OCR in animals kept for up to 5 weeks remained at similar levels (Figure 1, FT-1, one-way ANOVA, p=0.593), while OCR measurements after 10 weeks of live-storage showed a significant increase from initially ~150 µg O₂ h^-1g^-1 body wall dry weight (BW DW) to ~270 µg O₂ (Figure 1, FT-2, unequal variances t-test, p=0.005). Sea cucumbers, kept in the flow-through seawater system >1 year, displayed even higher OCR of ~390 µg O₂ h^-1g^-1 BW DW (Figure 1, FT-3, unequal variances t-test, p=0.045).”

The two corrected consecutive sentences appear below:

“Weight specific OCR in animals kept for up to 5 weeks remained at similar levels (Figure 1, FT-1, one-way ANOVA, p=0.593), while OCR measurements after 10 weeks of live-storage showed a significant increase from initially ~31 µg O₂ h^-1g^-1 body wall dry weight (BW DW) to ~55 µg O₂ (Figure 1, FT-2, unequal variances t-test, p=0.005). Sea cucumbers, kept in the flow-through seawater system >1 year, displayed even higher OCR of ~81 µg O₂ h^-1g^-1 BW DW (Figure 1, FT-3, unequal variances t-test, p=0.045).”

Another correction has been made to Results, 3.2 Effect of temperature during short-term live-storage, Paragraph 1. The original sentences previously stated:

“While oxygen demand at 4°C had almost halved compared to initial measurements at T0, consumption at 8 and 12°C remained unchanged at about 150 µg O₂ h^-1g^-1 dry weight throughout the four-week period.”

The corrected sentence appears below:

“While oxygen demand at 4°C had almost halved compared to initial measurements at T0, consumption at 8 and 12°C remained unchanged at about 31 µg O₂ h^-1g^-1 dry weight throughout the four-week period.”

A correction has been made to Discussion, Paragraph 1.

The sentence previously stated:

“The highest OCR values measured in this study (~390 µg O₂ g^-1h^-1) were associated with animals that had been fed regularly and stored for more than a year, but also animals kept without supplementary feed had a significantly higher oxygen demand (~270 µg O₂ g^-1h^-1 vs. ~150 µg O₂ g^-1h^-1) after 10 weeks of storage when compared with animals just brought in to the lab.”

The corrected sentence appears below:

“The highest OCR values measured in this study (~81 µg O₂ h^-1g^-1) were associated with animals that had been fed regularly and stored for more than a year, but also animals kept without supplementary feed had a significantly higher oxygen demand (~55 µg O₂ h^-1 g^-1 vs. ~31 µg O₂ h^-1g^-1) after 10 weeks of storage when compared with animals just brought in to the lab.”

A correction has been made to Discussion, Paragraph 5.

The sentence previously stated:

“Measurements conducted at 4°C after two weeks (T1) of acclimation in the lab revealed a mean consumption of 1.54 mg O₂ per group of three individuals per hour (mean 133 g wet weight per individual).”

The corrected sentence appears below:

“Measurements conducted at 4°C after two weeks (T1) of acclimation in the lab revealed a mean consumption of 0.32 mg O₂ per group of three individuals per hour (mean 133 g wet weight per individual).”

A correction has been made to Discussion, Paragraph 6.

These two consecutive sentences previously stated:

“He conducted measurements at 6°C and measured individual rates that ranged from 130 up to 427 µg O₂ h^-1g WW^-1. The mean OCR of the one individual (130 g wet weight) measured by Fox (1936) was 334 µg O₂ h^-1g WW^-1. Using total wet weight as reference, our converted values translate to average 790 µg O₂ h^-1g WW^-1 for individuals kept at 12°C and average 513 µg O₂ h^-1g WW^-1 for individuals kept at 4°C.”

The two corrected consecutive sentences appear below:

“He conducted measurements at 6°C and measured individual rates that ranged from 0.7 up to 2.3 µg O₂ h^-1g WW^-1. The mean OCR of the one individual (130 g wet weight) measured by Fox (1936) was 1.8 µg O₂ h^-1g WW^-1. Using total wet weight as reference, our converted values translate to average 1.65 µg O₂ h^-1g WW^-1 for individuals kept at 12°C and average 0.86 µg O₂ h^-1g WW^-1 for individuals kept at 4°C.”

The sentence previously stated:

“Newell and Courtney (1965) measured consumption rates of 23.14 to 66.43 µg O₂ h^-1g DW^-1 in adult Holothuria forskali at 17°C, compared to our measurements of 67 µg O₂ h^-1g DW^-1 in adult P. tremulus at 4°C and 156 µg O₂ h^-1g DW^-1at 12°C.”

The corrected sentence appears below:

“Newell and Courtney (1965) measured consumption rates of 23.14 to 66.43 µg O₂ h^-1g DW^-1 in adult Holothuria forskali at 17°C, compared to our measurements of 15 µg O₂ h^-1g DW^-1 in adult P. tremulus at 4°C and 27 µg O₂ h^-1g DW^-1 at 12°C.”

The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way. The original article has been updated.

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