Spatiotemporal Variation of Trace Elements and Stable Isotopes in Subtropical Estuaries: I. Freshwater Endmembers and Mixing Curves

Walther, Benjamin D.; Nims, Megan K.

doi:10.1007/s12237-014-9881-7

Cited by 46 publications

(62 citation statements)

References 96 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, because of a close positive relation of Ca concentration with salinity, there was a strong negative relation between Ba/Ca ratio and salinity (Table 3). In their study on trace metals in coastal waters along the Texas coast, Walther and Nims [51] reported a wide range of the Ba/Ca ratio, 62 to 973 µmol/mol, similar to the Ba/Ca ratios found in our study at the two sites closest to the Gulf of Mexico (Sites 5 and 6). The fact that higher Ba/Ca ratios were found at other sites upstream suggests that freshwater discharge plays an important role in this elemental ratio.…”

Section: Spatial Variationsupporting

confidence: 88%

“…Linear or nearly linear mixing of Sr and Ca across salinity gradients has been reported in estuaries worldwide [41,51,[64][65][66]. In our study, mixing curves of both the Ca and Sr concentrations across the salinity gradient in the Calcasieu River were linear ( Figure 6).…”

Section: Temporal Variationsupporting

confidence: 77%

“…The Sr and Ca concentrations in marine waters are significantly higher than in freshwaters due to different geological compositions of marine and fresh water systems [50,51]. Brown [50].…”

Section: Spatial Variationmentioning

confidence: 99%

“…Ba is usually elevated in fresh waters and then exhibits an oligohaline maximum, and shows generally conservative mixing afterwards for the remainder of the salinity range [51,57]. However, the mixing curves of Ba can be different from this pattern; for example, sampling season could play an important role in Ba distribution [58,59].…”

Section: Spatial Variationmentioning

confidence: 99%

“…However, not all constituents are equally effective as proxies. For instance, Walther and Nims [51] concluded that, in Texas systems, the capacity to detect animal movements across salinity gradients using the Sr/Ca ratio as a proxy will be more difficult compared to other systems, while using the Ba/Ca ratio as a proxy would be highly useful for tracking animal movements. In the Calcasieu River, the large spatial variations of the Sr/Ca and Ba/Ca ratios and the clear relationships between these ratios and salinity indicate that both would be very useful as proxies for tracking animal movement.…”

Section: Spatial Variationmentioning

confidence: 99%

See 4 more Smart Citations

Spatiotemporal Distributions of Sr and Ba along an Estuarine River with a Large Salinity Gradient to the Gulf of Mexico

2016

Water

View full text Add to dashboard Cite

Strontium and barium to calcium ratios are often used as proxies for tracking animal movement across salinity gradients. Many estuarine rivers face saltwater intrusion due to sea level rise, potentially causing changes in mobility and distribution of these metals upstream. From May 2013 to August 2015, monthly water samples were collected and in-situ measurements were performed at six sites along an estuary strongly affected by saltwater intrusion, the Calcasieu River, with salinity ranging from 0.02 to 29.50 Parts Per Thousand (ppt). Results showed that the total Sr concentration and the Sr/Ca ratio both increased significantly with increasing salinity. The average Sr concentration at the site closest to the Gulf of Mexico (Site 6) was 46.21 µmol/L, about 130 times higher than that of the site furthest upstream (Site 1, 0.35). The average Sr/Ca ratio at Site 6 (8.41 mmol/mol) was about three times the average Sr/Ca ratio at Site 1 (2.89). However, the spatial variation in total Ba concentration was marginal, varying from 0.36 to 0.47 µmol/L. The average Ba/Ca ratio at Site 1 (4.82 mmol/mol) was about 54 times the ratio at Site 6 (0.09), showing a negative relation between the Ba/Ca ratio and salinity. All elemental concentrations and ratios had considerable seasonal variations, with significant differences among sampling months for the Sr and Ba concentrations and the Ba/Ca ratio (p < 0.01). The results suggest that for low-gradient estuarine rivers such as the Calcasieu River, water chemistry upstream would experience substantial Sr and Ca enrichment, potentially affecting aquatic environments and biological communities.

show abstract

Section: Spatial Variationsupporting

confidence: 88%

Section: Temporal Variationsupporting

confidence: 77%

“…The Sr and Ca concentrations in marine waters are significantly higher than in freshwaters due to different geological compositions of marine and fresh water systems [50,51]. Brown [50].…”

Section: Spatial Variationmentioning

confidence: 99%

Section: Spatial Variationmentioning

confidence: 99%

Section: Spatial Variationmentioning

confidence: 99%

See 3 more Smart Citations

Spatiotemporal Distributions of Sr and Ba along an Estuarine River with a Large Salinity Gradient to the Gulf of Mexico

2016

Water

View full text Add to dashboard Cite

show abstract

Unravelling the complex habitat use of the white mullet, Mugil curema, in several coastal environments from Neotropical Pacific and Atlantic waters

Avigliano

Ibáñez

Fabré

et al. 2021

Aquatic Conservation

View full text Add to dashboard Cite

The white mullet, Mugil curema, is a widely distributed euryhaline species, the migratory behaviour of which is poorly understood. The objective of this work was to study the large‐scale habitat use of this species for the first time. Several environments were considered, such as euryhaline and hypersaline lagoons, the sea, and a river, distributed in the Central Pacific (Mexico) and Atlantic (Gulf of Mexico, Caribbean Sea‐Venezuela, and north‐eastern Brazil). Otolith core‐to‐edge Sr/Ca ratios of 163 fish, determined by laser ablation inductively coupled plasma mass spectrometry, were used to study the salinity‐habitat migration history of the fish. Fish from Mexico (Tamiahua Lagoon, n = 4; Alvarado Lagoon, n = 2), Venezuela (n = 1), and Brazil (n = 12) (11.1% of the total) showed high Sr/Ca values at early life stages and were classified as marine estuarine opportunists. Two specimens (from Alvarado Lagoon and Balsas River, Mexico) showed Sr/Ca values consistently below the high salinity guide value (salinity < 33.5). For the rest of the fish (87.1%), the Sr/Ca ratio suggested a displacement from the estuary towards the sea or hypersaline environments, and so these fish were classified as estuarine migrants. A change‐point analysis identified six individuals with a single stable otolith Sr/Ca signature through ontogeny (three from Brazil, one from Venezuela, and two from Tamiahua Lagoon, Mexico), suggesting limited displacement between environments with different salinities. The rest of the individuals showed between two and 10 changes in stable Sr/Ca signatures (mean = 4.07 ± 1.85). The highest number of changes in Sr/Ca ratio (4.87 ± 1.1) was found in fish from Laguna Madre (Mexico) and the lowest was found in fish from Brazil (3.27 ± 1.70) (H = 19.8, p = 0.002). Otolith Sr/Ca time series suggest that the migratory estuarine pattern is the most common throughout the study area. This work highlights that the sustainable use of M. curema depends on the conservation of estuaries and the corridors between them and other environments such as lagoons, rivers, mangroves and the sea.

show abstract

Telemetry reveals migratory drivers and disparate space use across seasons and age‐groups in American horseshoe crabs

et al. 2021

View full text Add to dashboard Cite

Identifying mechanisms that underpin animal migration patterns and examining variability in space use within populations is crucial for understanding population dynamics and management implications. In this study, we quantified the migration rates, seasonal changes in migratory connectivity, and residency across population demographics (age and sex) to understand the proximate cues of migration timing in American horseshoe crabs (Limulus polyphemus). Juvenile (n = 25) and adult (n = 70) horseshoe crabs were tracked with acoustic telemetry techniques for a 3‐yr period in Moriches Bay, NY. Connectivity metrics and residency probability were quantified through spatial network analysis and empirically derived Markov Chain models (EDMC), respectively. The migratory probability of adult horseshoe crabs between Moriches Bay and the Atlantic Ocean was estimated to be 41.0% (95% CI: 34.0–59.8); in contrast, only 8% (95% CI: 1.2–31.6) of juveniles migrated into the ocean. Migration timing was influenced by the interaction of photoperiod and temperature, revealing seasonal differences in migration timing and a 50% narrower range of photoperiod and temperature over which fall migrations occurred compared to spring. Sex‐specific differences in space use and connectivity within each season were largely absent; however, centralized habitats were important for maintaining connectivity across all seasons. EDMC results revealed that when standardized to the number of horseshoe crab detections on each receiver, the centrally located habitats in Moriches Bay and Inlet accounted for >50% of the total relative residency probability within most seasons, indicating these areas may be preferred by adult horseshoe crabs. Ontogenetic differences in maximum spatial extent, space use, and connectivity were observed in the bay, as juveniles exhibited lower linkages between locations (n = 4) relative to adults (n = 13) during the same temporal period. Our work highlights the application of novel quantitative approaches for addressing the movement dynamics of horseshoe crabs that can be readily applied to other taxa in the context of wildlife conservation.

show abstract

Spatiotemporal Variation of Trace Elements and Stable Isotopes in Subtropical Estuaries: I. Freshwater Endmembers and Mixing Curves

Cited by 46 publications

References 96 publications

Spatiotemporal Distributions of Sr and Ba along an Estuarine River with a Large Salinity Gradient to the Gulf of Mexico

Spatiotemporal Distributions of Sr and Ba along an Estuarine River with a Large Salinity Gradient to the Gulf of Mexico

Unravelling the complex habitat use of the white mullet, Mugil curema, in several coastal environments from Neotropical Pacific and Atlantic waters

Telemetry reveals migratory drivers and disparate space use across seasons and age‐groups in American horseshoe crabs

Contact Info

Product

Resources

About