High-resolution stable isotope records from North Atlantic cod

Weidman, Christopher R.; Millner, Richard S.

doi:10.1016/s0165-7836(00)00157-0

Cited by 124 publications

(124 citation statements)

References 25 publications

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“…Several studies on cod have shown no clear pattern of otolith δ 13 C associated with seasons (Weidman & Millner 2000, Jamieson et al 2004. Although rearing experiments are the best way to control for metabolic and trophic patterns, 2 significant issues must be brought forward from our results.…”

Section: Environmental Influences On Hake Recruits and Juvenilesmentioning

confidence: 81%

“…Of all elements and isotopes included in the otolith carbonate, 18 O/ 16 O ratios (δ 18 O) have been used to estimate past ambient temperatures experienced by fish (Høie et al 2004a) and applied to corroborate fish age estimation (Weidman & Millner 2000) or to study stock structure (Gao et al 2001). Studies estimating temperature-dependent fractionation of oxygen isotopes in otoliths have so far concluded that deposition occurs at or near equilibrium; that is, only temperature explains variation in isotopic fractionation between the water and the carbonate of the otolith (Høie et al 2004b).…”

Section: Introductionmentioning

confidence: 99%

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Environmental influences on the recruitment process inferred from otolith stable isotopes in Merluccius merluccius off the Balearic Islands

Hidalgo¹,

Tomás²,

Høie³

et al. 2008

Aquat. Biol.

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Oxygen (δ 18 O) and carbon (δ 13 C) isotope ratios in sagittal otoliths were analysed in recruits and juveniles of European hake Merluccius merluccius L. caught in the northwest (Sóller, SO) and south (Cabrera, CA) of the Island of Mallorca (western Mediterranean) over 2 consecutive years (2003 and 2004). The analytical method used allowed data to be gathered on both environmental and trophic conditions experienced by fish during the pelagic early life stages (registered in the composition of the inner part of the otolith, core area) and the demersal aggregations of recruits (at the otolith edge). Results on the seasonal variation of oxygen isotope signatures at the edge of fish otoliths captured in SO and CA indicated different vertical migration behaviours of hake between the bottom and the thermocline. δ 13 C showed a clear ontogenetic pattern between the core area and the edge, confirming the differences in diet from the early stages to post-recruits. The seasonal analysis of δ 13 C data from the otolith edge indicated that fish from the early stages in June 2003 encountered poorer trophic resources, which resulted in poor fish condition and subsequent poorer recruitment. The estimated temperature from the core area of otoliths showed lower temperature regimes in the 2002 hatching season compared to the 2003 hatching season, which could be a possible explanation for the observed differences in success of subsequent recruitment.

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Section: Environmental Influences On Hake Recruits and Juvenilesmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Environmental influences on the recruitment process inferred from otolith stable isotopes in Merluccius merluccius off the Balearic Islands

Hidalgo¹,

Tomás²,

Høie³

et al. 2008

Aquat. Biol.

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“…In other Northeast Atlantic ecosystems, cod experience more or less pronounced variations in temperature in synchrony with the seasonal feeding patterns, which lead to distinct opacity patterns in the otolith macrostructure (Weidman & Millner 2000, Høie & Folkvord 2006. But this is not the case in Baltic cod.…”

Section: Discussionmentioning

confidence: 99%

Using data storage tags to link otolith macro- structure in Baltic cod Gadus morhua with environmental conditions

Hüssy¹,

Nielsen²,

Mosegaard³

et al. 2009

Mar. Ecol. Prog. Ser.

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We examined otolith opacity of Baltic cod in relation to environmental conditions in order to evaluate the formation mechanisms of seasonal patterns used in age determination. Adult fish were tagged with data storage tags (DSTs) and a permanent mark was induced in the otoliths by injection of a strontium chloride solution. Based on environmental conditions experienced, fish were classified into different behavioural types: non-reproducing 'non-spawner', and 'spawner' undertaking spawning migrations. Otolith opacity, an indicator of otolith and fish somatic growth and condition, was examined in relation to these environmental drivers. Temperature was the only environmental variable with a significant effect, overlaying a strong size-related effect. The temperature effect was not uniform across behavioural types and spawning periods. Opacity showed a negative correlation with temperature as expected -but in non-spawning fish only. In spawners, the general trend was a decrease in opacity from pre-to post spawning. A significant -but positive -temperature effect was only found in the pre-spawning period. The negative effects during and following spawning were not significant. In spawners, this decoupling leads to an otolith structure with stronger contrasts and more abrupt changes, while in non-spawners, opacity changes more smoothly. The trigger for this decoupling seems to be an interaction between temperature exposure and seasonal variations in food availability and may serve as a tool to identify the occurrence and repetitiveness of spawning in Baltic cod.

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“…Therefore, some elements in the otoliths, especially ratios of strontium/calcium and stable isotopes of carbon and oxygen, are widely used for reconstruction of various individual records, such as seawater/freshwater migrations (Tsukamoto et al 1998), thermal history (Devereux 1967), and metabolic effects (Kalish 1991a). However, uncertainty in the proportion of otolith carbon derived from 2 sources, metabolic CO 2 (mCO 2 ) and dissolved inorganic carbon (DIC) in ambi-ent water, leads to difficulty in estimating individual histories by stable carbon isotopic ratio (δ 13 C) analyses (Weidman & Millner 2000). Therefore, it is important to determine the ratio of otolith carbonate derived from the 2 sources for any accurate estimation using δ 13 C. Recently, Solomon et al (2006) were the first to determine that the ratio of otolith carbon derived from mCO 2 and water is 0.17:0.83, using δ 13 C in otoliths of rainbow trout Oncorhynchus mykiss maintained in a controlled environment.…”

Section: Introductionmentioning

confidence: 99%

Sources of otolith carbonate: experimental determination of carbon incorporation rates from water and metabolic CO2, and their diel variations

Tohse¹,

Mugiya²

2008

Aquat. Biol.

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Although carbon isotopes in fish otoliths are widely utilized to obtain information on environmental records, uncertainty regarding the sources of otolith carbonate, either from fish diet or ambient water, limits detailed determinations. The present study experimentally determined absolute incorporation rates of carbon derived from 2 sources, metabolic CO 2 and ambient water, into otoliths using goldfish under controlled conditions. In addition, the proportions of the 2 sources in otolith daily increments were also determined by the diel variations in the rate of incorporation from the 2 sources. A group of fish was administered with D-[ 14 C-U]-glucose or was exposed to water containing NaH 14 CO 3 , and incubated for 1, 3, 6, 12 and 24 h. Another group was similarly treated with the radiocarbons at 06:00, 12:00, 18:00, 00:00 or again at 06:00 h, and were incubated for 6 h. After incubation, serum and otoliths were collected and were separated into organic and inorganic carbon fractions, and the incorporation rates from the 2 sources were determined. The rates of carbon incorporation from D-[ 14 C-U]-glucose injected and NaH 14 CO 3 water were 0.27 (25.5%) and 0.79 (74.5%) nmol mg -1 otolith h -1 , respectively. During darkness (18:00 to 06:00 h), both the incorporation rate and proportion of metabolic-CO 2 -derived carbon significantly decreased to ~50% of that during daylight. These results suggest that otolith carbonate is mainly derived from ambient water, and the ratio of carbon derived from metabolic CO 2 is lower in the D-zone than that in the L-zone of the otolith daily increments.

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High-resolution stable isotope records from North Atlantic cod

Cited by 124 publications

References 25 publications

Environmental influences on the recruitment process inferred from otolith stable isotopes in Merluccius merluccius off the Balearic Islands

Environmental influences on the recruitment process inferred from otolith stable isotopes in Merluccius merluccius off the Balearic Islands

Using data storage tags to link otolith macro- structure in Baltic cod Gadus morhua with environmental conditions

Sources of otolith carbonate: experimental determination of carbon incorporation rates from water and metabolic CO2, and their diel variations

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