AFSC/RACE/SAP/Foy: Effects of ocean acidification on larval Tanner crab: Kodiak Island, Alaska.

Metadata Updated: November 17, 2018

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.

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Metadata Date February 28, 2018
Metadata Created Date May 31, 2016
Metadata Updated Date November 17, 2018
Reference Date(s) (publication)
Frequency Of Update notPlanned

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Harvested from NOAA CSW Harvest Source

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Resource Type Dataset
Metadata Date February 28, 2018
Metadata Created Date May 31, 2016
Metadata Updated Date November 17, 2018
Reference Date(s) (publication)
Responsible Party (Point of Contact, Custodian)
Contact Email
Access Constraints 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
Bbox East Long -151.1
Bbox North Lat 57.72
Bbox South Lat 57.65
Bbox West Long -152.3
Coupled Resource
Frequency Of Update notPlanned
Guid gov.noaa.nmfs.inport:27853
Harvest Object Id 58dcc48c-63cd-4660-80ac-e702c7d29081
Harvest Source Id 2aed8e29-fc5b-4cde-aa66-fb1118fd705e
Harvest Source Title NOAA CSW Harvest Source
Metadata Language eng
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2011-06-21
Temporal Extent End 2013-07-03

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