Predicting strontium isotope variation and fish location with bedrock geology: Understanding the effects of geologic heterogeneity

Hegg, Jens C.; Kennedy, Brian P.; Fremier, Alexander K.

doi:10.1016/j.chemgeo.2013.10.010

Cited by 49 publications

(52 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, our sample size ( N = 7) is insufficient for further exploration of how these and other potential drivers of basin 87 Sr/ 86 Sr (e.g., geologic heterogeneity; see Hegg et al. ) may be used to predict river 87 Sr/ 86 Sr.…”

Section: Resultsmentioning

confidence: 99%

“…; Bataille & Bowen ; Hegg et al. ). The NRB and the majority of its northern tributaries are primarily underlain by silicate rocks rich in Sr with high 87 Sr/ 86 Sr ratios (Edmond et al.…”

Section: Methodsmentioning

confidence: 99%

“…; Bataille & Bowen ; Hegg et al. ) and that it is often less variable than trace element chemistry in surface waters (with notable exceptions, e.g., Clow et al. ; Aubert et al.…”

Section: Methodsmentioning

confidence: 99%

“…; Bataille & Bowen ; Hegg et al. ), both of which vary substantially across this system. In this study, we sought to determine whether otolith geochemistry could provide a useful indicator of provenance of Cichla temensis in the Rio Negro system.…”

Section: Introductionmentioning

confidence: 92%

See 3 more Smart Citations

Otolith geochemistry in young‐of‐the‐year peacock bass Cichla temensis for investigating natal dispersal in the Rio Negro (Amazon – Brazil) river system

Sousa

Humston

Harbor

et al. 2014

Ecology of Freshwater Fish

View full text Add to dashboard Cite

This study examined otolith geochemistry as a natural marker of natal origins in young‐of‐the‐year (YOY) Cichla temensis in the Negro River Basin of Brazil. We analysed trace element and isotopic composition of otoliths of YOY collected off spawning nests from the main stem and major tributaries. These were compared with regional bedrock geologic composition to explore underlying mechanisms of differences in otolith geochemistry. Our results suggest that spatial differences in otolith geochemistry can be used to distinguish natal origins based on 87Sr/86Sr, Sr/Ca and Ba/Ca ratios. This approach allowed us to correctly classify 99% of juvenile fish to their natal streams using cross‐validation in a linear discriminant function analysis (LDFA). Patterns of otolith isotopic composition correspond with patterns in regional geology as expected based on previously demonstrated correlations, although some fine‐scale spatial differences cannot be accounted for by available geologic information. These results demonstrate that otolith chemistry is valuable as a natural marker of natal origins in this system and suggest that inferences from geologic maps may be useful for interpreting movements based on otolith geochemical signatures. This information provides the basis for future work to investigate the early life history and spatial ecology of this important cichlid.

show abstract

Section: Resultsmentioning

confidence: 99%

“…; Bataille & Bowen ; Hegg et al. ). The NRB and the majority of its northern tributaries are primarily underlain by silicate rocks rich in Sr with high 87 Sr/ 86 Sr ratios (Edmond et al.…”

Section: Methodsmentioning

confidence: 99%

“…; Bataille & Bowen ; Hegg et al. ) and that it is often less variable than trace element chemistry in surface waters (with notable exceptions, e.g., Clow et al. ; Aubert et al.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

See 2 more Smart Citations

Otolith geochemistry in young‐of‐the‐year peacock bass Cichla temensis for investigating natal dispersal in the Rio Negro (Amazon – Brazil) river system

Sousa

Humston

Harbor

et al. 2014

Ecology of Freshwater Fish

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

Sawfish, read in tooth and saw: Rostral teeth as endogenous chemical records of movement and life‐history in a critically endangered species

Hegg

Graves

Fisher

2021

Aquatic Conservation

Self Cite

View full text Add to dashboard Cite

The ecology of endangered and rare species can be difficult to study owing to their low abundances and legal limits on scientist’s ability to catch, sample, and track them. This is particularly true of sawfish (family Pristidae), whose numbers have declined precipitously, placing all five species on the IUCN Red List of Threatened Species worldwide. Best known for their distinctive, toothed rostrum, the ecology, movement and life‐history of sawfish are poorly understood. Sawfish rostral teeth are modified placoid scales, which grow continuously throughout the life of the fish. This continuous growth, combined with their stable calcified makeup, makes sawfish rostral teeth a potential source of temporal records of chemical and isotopic changes through the life of the fish. Rostral teeth are often preserved in museums and as curios, potentially providing a source of life‐history data to inform conservation actions without the need for field study, or as an important compliment to it. This is the first study to recover temporally explicit chemical data from sawfish rostral teeth. Using archived samples of largetooth sawfish (Pristis pristis) we show that multiple chemical tracers can be recovered from sawfish rostral teeth, and that these tracers can be used to understand movement across salinity gradients. We further show that sawfish rostral teeth contain repeated structures and indistinct banding which could potentially be used for ageing or growth analysis of fish.

show abstract

Predicting strontium isotope variation and fish location with bedrock geology: Understanding the effects of geologic heterogeneity

Cited by 49 publications

References 26 publications

Otolith geochemistry in young‐of‐the‐year peacock bass Cichla temensis for investigating natal dispersal in the Rio Negro (Amazon – Brazil) river system

Otolith geochemistry in young‐of‐the‐year peacock bass Cichla temensis for investigating natal dispersal in the Rio Negro (Amazon – Brazil) river system

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

Sawfish, read in tooth and saw: Rostral teeth as endogenous chemical records of movement and life‐history in a critically endangered species

Contact Info

Product

Resources

About