Inter-annual variability in isotope and elemental ratios recorded in otoliths of an anadromous fish

Walther, Benjamin D.; Thorrold, Simon R.

doi:10.1016/j.gexplo.2008.10.001

Cited by 68 publications

(61 citation statements)

References 37 publications

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“…The Sr: Ca ratios observed in the Hudson River during the present study were consistent with those observed during previous studies in 2000, 2001, and 2004, while Ba:Ca was higher by roughly an order of magnitude in this study (1.5-2.6) versus previous studies (0.7-0.75; Limburg and Siegel 2006;. reported higher d 18 O in the Hudson River than we observed, consistent with previous studies examining the effects of interannual variation on otolith chemistry (Walther and Thorrold 2009).…”

Section: Turner and Limburgsupporting

confidence: 93%

Determination of River Herring Natal Origin using Otolith Chemical Markers: Accuracy as a Function of Spatial Scale and Choice of Markers

Turner

Limburg

2014

Trans Am Fish Soc

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We investigated the spatial and temporal accuracy of otolith chemistry for distinguishing populations (and subpopulations) of anadromous river herring (Alewife Alosa pseudoharengus and Blueback Herring A. aestivalis) from New York watersheds. Water chemistry of selected analytes (Sr:Ca, Ba:Ca, 87:86Sr, and δ18O) differed spatially and interannually among sites within the Hudson River as well as between the Hudson River and Long Island estuaries. Otolith chemical markers for juvenile river herring differed significantly among all sampling sites, with combined elemental and isotopic ratios differing significantly between species and between years, although the effect of year did not influence assignments at broad spatial scales (i.e., 105 m). Adult river herring collected in the Hudson River were assigned to natal sites using all juvenile otolith markers except δ18O, which had methodological problems. Adult Alewives and Blueback Herring were classified to Hudson River populations at 73% and 42%, respectively. Inclusion of δ18O in the assignment model likely would have increased the percentage of adults assigned to the Hudson River, as juvenile reclassification accuracies were lower without δ18O and oxygen isotopes are strongly correlated with latitude. Otolith chemistry matched our geochemical atlas of water and distinguished among populations and subpopulations at a range of spatial scales. However, rates of reclassification are dependent on the markers included and the geographic distances among groups. Received March 31, 2014; accepted July 16, 2014

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Section: Turner and Limburgsupporting

confidence: 93%

Determination of River Herring Natal Origin using Otolith Chemical Markers: Accuracy as a Function of Spatial Scale and Choice of Markers

Turner

Limburg

2014

Trans Am Fish Soc

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“…The few isotope studies include a paper by Gao (2002) which reported large decadal-scale changes in δ 18 O ratios of Atlantic cod (Gadus morhua) otoliths. Also, Walther and Thorrold (2009) found that δ 18 O showed significant yearly variability in juvenile American shad (Alosa sapidissima) otoliths collected from three U.S. Atlantic coast river systems. They reported differences in δ 18 O of up to 1.5‰ among the three years sampled.…”

Section: Resultsmentioning

confidence: 94%

“…However, there are no significant changes in elevation among the different watersheds of these estuarine systems and the distances among these watersheds are relatively small; therefore, significant changes in river water δ 18 O would not be expected among these systems. Walther and Thorrold (2009) reported significant yearly variations in the δ 18 O of otoliths from American shad collected from three river systems. They suggested that these differences were likely related to inter-annual variations in the amounts or sources of water to the watersheds or physical factors such as temperature or evaporation.…”

Section: Salinitymentioning

confidence: 99%

Spatial and temporal trends in stable carbon and oxygen isotope ratios of juvenile winter flounder otoliths

2011

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Isotopic ratios of fish otoliths have been used in numerous studies as natural tags or markers to aid in the study of connectivity among fish populations. We investigated the use of spatial and temporal changes in the stable carbon and oxygen isotope ratios of otoliths to differentiate juvenile habitats of winter flounder (Pseudopleuronectes americanus). Young-of-the-year (YOY) juvenile winter flounder were collected annually over a three-year period from 18 stations along the coast of Rhode Island, USA. Sagittal otoliths were removed from fish and analyzed for stable carbon ( 13 C/ 12 C or δ 13 C) and oxygen ( 18 O/ 16 O or δ 18 O) isotope ratios using continuous flow isotope ratio mass spectrometry. Differences in isotope ratios were observed among stations and along salinity gradients in the Narragansett Bay estuary and an estuarine river system (Narrow River). Overall, the isotope ratio patterns observed among stations were consistent over the three sampling years; however, differences were noted in isotope ratios and the magnitude of the isotope ratio gradients among years. Significant positive correlations were noted between salinity and δ 13 C for two of the three years. For each of the three years sampled there was a highly significant positive correlation (2002, r= 0.93, P<0.01; 2003, r=0.85, P<0.01; 2004, r=0.97, P < 0.01) between δ 18 O and the salinity of the collection site. Also, there was a significant negative correlation between the number of months of above average river flow and δ 18 O for the three sampling years (r=0.99, P<0.05). These findings suggest that yearly changes in the volume of freshwater inputs to these estuarine habitats may be related to the differences observed in otolith δ 18 O isotope ratios. Because of these year-to-year differences, sampling of each cohort may be necessary in order to use this isotopic technique for winter flounder connectivity studies.

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“…In relation to monitoring and use of otolith microchemistry, analyzing the geochemical origin of different studied elements, as well as the incorporation of isotopical relations could generate other markers of origin to study even adult individuals (Ashford & Jones, 2007;Walther & Thorrold, 2009;Niklitschek et al, 2010;Hegg et al, 2013Hegg et al, , 2015Garcez et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Identification of nurseries areas of juvenile Prochilodus lineatus (Valenciennes, 1836) (Characiformes: Prochilodontidae) by scale and otolith morphometry and microchemistry

et al. 2016

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The streaked prochilod Prochilodus lineatus (Valenciennes) is a commercially freshwater species from South America, distributed in the Plata basin. In the present work the morphometry (circularity, rectangularity, form factor, OL/OW and ellipticity indices) and chemistry (Sr:Ca, Ba:Ca, Zn:Ca) of lapilli otolith, and geometric morphometry of scales of streaked prochilod juveniles, in two sites in the Plata basin (Uruguay River and Estrella Wetland), were compared to determine if they are area-specific and to identify possible breeding areas. Otolith Ba:Ca ratios was 0.017±0.003 mmol/ mol for Uruguay River while for Estrella Wetland individuals was bellow the detection limits. Zn:Ca ratios tended to be higher for the latter (0.03±0.002 mmol/mol). Significantly high circularity and low rectangularity values were obtained for Estrella Wetland otoliths (p < 0.05), while no significant differences for form factor, OL/OW and ellipticity were observed between sampling sites. Considering all scale geometric morphometry variables, discriminant analysis showed a good percentage of classification of individuals (90.5% for Estrella Wetland and 85.7 % for Uruguay River). These results indicate that the otolith microchemisty and morphometry (circularity and rectangularity indices) and scale morphometry are good markers of habitat and represent a potential tool for identification of streaked prochilod nursery areas.El sábalo Prochilodus lineatus (Valenciennes) es una especie de importancia comercial de agua dulce de Sudamérica, distribuida en la cuenca del Plata. En este trabajo se comparó la morfometría (índices de circularidad, rectangularidad, factor de forma, OL/OW y elipticidad) y microquímica (Sr:Ca, Ba:Ca y Zn:Ca) del otolito lapilli, y la morfometría geométrica de las escamas de sábalos juveniles capturados en dos sitios de la cuenca del Plata (Río Uruguay y bañado la Estrella), para determinar si existen diferencias área-especificas e identificar posibles sitios de cría. La relación Ba:Ca del otolito fue 0.017±0.003 mmol/mol para el río Uruguay mientras que estuvo por debajo del límite de detección para los individuos del bañado la Estrella. La relación Zn:Ca tendió a ser más alta en el bañado la Estrella (0.03±0.002 mmol/mol). Se obtuvieron valores significativamente altos de circularidad y bajos de rectangularidad para el bañado la Estrella (p < 0.05), mientras que no se hallaron diferencias para el factor de forma, OL/OW y elipticidad. Considerando la morfometría geométrica de las escamas, el análisis discriminante mostró buenos porcentajes de clasificación (90.5% para el bañado la Estrella y 85.7 % para el Río Uruguay). Estos resultados indican que la microquímica y morfometría del otolito (índices de rectangularidad y circularidad) y la morfometría de las escamas son buenos marcadores de hábitat y representan una herramienta potencial para la identificación de sitios de cría del sábalo.

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Inter-annual variability in isotope and elemental ratios recorded in otoliths of an anadromous fish

Cited by 68 publications

References 37 publications

Determination of River Herring Natal Origin using Otolith Chemical Markers: Accuracy as a Function of Spatial Scale and Choice of Markers

Determination of River Herring Natal Origin using Otolith Chemical Markers: Accuracy as a Function of Spatial Scale and Choice of Markers

Spatial and temporal trends in stable carbon and oxygen isotope ratios of juvenile winter flounder otoliths

Identification of nurseries areas of juvenile Prochilodus lineatus (Valenciennes, 1836) (Characiformes: Prochilodontidae) by scale and otolith morphometry and microchemistry

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