Search Help Show/Hide Menu
Summary
Item Identification
Keywords
Physical Location
Data Set Info
Support Roles
Extents
Access Info
Distribution Info
Tech Environment
Data Quality
Data Management
Lineage
Child Items
Catalog Details

Summary

Short Citation
Alaska Fisheries Science Center, 2025: AFSC/RACE/SAP/Foy: Effects of ocean acidification on larval Tanner crab: Kodiak Island, Alaska., https://www.fisheries.noaa.gov/inport/item/27853.
Full Citation Examples

Abstract

To study the effects of ocean acidification we examined the effects of ocean acidification on the larval stages of the economically important southern Tanner crab, Chionoecetes bairdi.

Ovigerous females were reared in one of 3 treatments: control (ambient pH ~8.1), pH 7.8, and pH 7.5 for 2 years. Larvae in year 1 were from oocytes developed in the field whereas larvae in year

2 were from oocytes developed under acidified conditions. Larvae hatched each year, were also exposed to 3 pH treatments to examine starvation-survival, morphology, condition, and calcium/magnesium

content. Approximately 300 larvae were stocked in multiple treatments for testing the effect of pH. Hatching success was measured as the total % of larval hatched from a full clutch while duration

was the number of days over which hatching occurred. Hatching success did not differ among treatments in 2012 but varied between 46 to 87% in 2013 dependent on pH treatment. Larval mass was highest

in pH 7.8 in 2012 and lowest in the control, however in 2013 the highest larval mass was in the control water. There were only small (not significant) changes in magnesium or calcium content among

treatments in 2012 however, the reduction in both minerals at higher pH was greater in 2013. There was higher percent carbon and nitrogen contents in pH 7.5 larvae in 2013. The morphology of Tanner

crab larval was assessed from 200 larvae stocked in multiple 2 L beakers. There was no effect of treatment on larval morphometrics. In 2012 and 2013, we examined if embryos developed under acidified

conditions affected larval morphology by assessing 15 newly hatched larvae from each treatment. There was again no effect of treatment on larval morphometrics. Starvation survival experiments

were performed in 1 L sized PVC inserts. In both years larvae from embryos that developed in pH 7.5 water survived about 3 days longer than those that developed in control water. However, in 2012

larvae from embryos that had developed in pH 7.8 water were similar to control larvae whereas in 2013 they were intermediate between the control and pH 7.5 larvae. The overall effects of treatment

at the larval stage appeared to be better condition and initial survival at lower pH, however multiple years of treatment led to lower survival.

Distribution Information

Access Constraints:

none

Use Constraints:

Must read and fully comprehend the metadata prior to data use; acknowledgement of the Originator when using the data set as a source;

sharing of data products developed using the source data set with the Originator; data should not be used beyond the limits of the source scale;

the data set is NOT a survey document and should not be utilized as such

Contact Information

Point of Contact
Robert Foy
robert.foy@noaa.gov

Metadata Contact
Robert Foy
robert.foy@noaa.gov

Extents

Geographic Area 1

-152.3° W, -151.1° E, 57.72° N, 57.65° S

Kodiak Island, Alaska

Time Frame 1
2011-06-21 - 2013-07-03