Journal article
Otolith biochronology reveals factors underlying dynamics in marine fish larvae
Marine ecology. Progress series (Halstenbek), Vol.412, pp.1-10
2010
DOI: 10.3354/meps08698
Abstract
The environmental factors include the drift out of the Gulf of Alaska (GOA) (Transport), sea surface temperature (SST), surface wind speed in Shelikof Strait (WindS) and the Pacific Decadal Oscillation (PDO). The biological factors consist of the spawning biomass of the pollock in GOA (Fig. S1) and the proportion of spawners that are 8 yr or older (Fig. S2). We only had monthly average SST, so we used linear interpolation of the observed SST to approximate daily SST. Transport and WindS are daily data. The first 5 mo SST and WindS in each year from 1981 to 2001 are shown in Figs. S3 & S4. For the environmental factors SST and WindS, we compute their anomalous daily values by subtracting the daily average from the observed daily values. For each of the covariates: anomalous SST and anomalous WindS, we computed 2 auxiliary variables. One auxiliary variable is calculated as the average covariate over the 30 d prior to a hatchdate, which attempts to quantify the effects of environmental conditions relevant to the spawning pattern and the hatching process. The second auxiliary variable attempts to quantify the environmental conditions on larval pollock survival, which is computed as the average of a given covariate over the period from the hatchdate to the catch date. The auxiliary variables for the anomalous SST from 1981 to 2001 are shown in Figs. S5 & S6, where SSTB measures the average 30 d anomalous SST before a hatchdate, while SSTA measures the average anomalous SST between the hatchdate and the corresponding catch date. As transport is postulated to affect larval survival but not mature fish, we compute the average transport from the hatchdate to the catch date in order to assess the transport effect on larval survival. PDO mainly affects pollock spawning patterns, so the mean anomalous PDO from January to March was computed for each year. Supporting information
Details
- Title: Subtitle
- Otolith biochronology reveals factors underlying dynamics in marine fish larvae
- Creators
- Kung Sik ChanTianyang ZhangKevin M Bailey
- Resource Type
- Journal article
- Publication Details
- Marine ecology. Progress series (Halstenbek), Vol.412, pp.1-10
- DOI
- 10.3354/meps08698
- ISSN
- 0171-8630
- eISSN
- 1616-1599
- Language
- English
- Date published
- 2010
- Academic Unit
- Statistics and Actuarial Science; Radiology
- Record Identifier
- 9983985875602771
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