Utilization of organic matter by invertebrates along an estuarine gradient in an intermittently open estuary

Lautenschlager, Agnes D.; Matthews, Ty G.; Quinn, Gerry P.

doi:10.1016/j.ecss.2014.08.020

Cited by 15 publications

(9 citation statements)

References 76 publications

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“…2). These results support the findings of previous studies wherein food sources of terrestrial origin were the major sources to the primary consumers in the upper estuary, whereas phytoplankton and food sources of marine origin became important in the lower estuary (Lautenschlager et al 2014;Careddu et al 2015;Claudino et al 2015). Based on previous studies on mangrove ecosystems, sesarmid crabs appear to consume plant materials directly or indirectly (Bouillon et al 2004) and exhibit high feeding activity on sediment (Skov and Hartnoll 2002).…”

Section: Discussionsupporting

confidence: 90%

Intraspecific diet shifts of the sesarmid crab, Sesarma dehaani, in three wetlands in the Han River estuary, South Korea

Yang

Han

2019

j ecology environ

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Background: Han River estuary is a national wetland reserve near the Demilitarized Zone (DMZ) between South Korea and North Korea. This trans-boundary estuary area has been well preserved and shows distinctive plant communities along the salinity gradient. To elucidate energy flows and nutrient cycling in this area, we studied trophic relations between the dominant sesarmid crab, Sesarma dehaani, and food sources in three wetlands with different environments along the estuarine gradients. Results: Stable isotope signatures (δ 13 C and δ 15 N) of the crabs were significantly different among the sites and body size classes. Seasonal changes in δ 13 C of small crabs were distinct from those of large individuals at all the sites. The isotopic values and fatty acid profiles of the crabs were more different among the sites in September than in May. In May, large-sized crabs utilized more plant materials compared to other dietary sources in contrast to small-sized crabs as revealed by a stable isotope mixing modeling, whereas contributions to diets of crabs were not dominated by a specific diet for different body size in September except at site 1. Based on PCA loadings, fatty acid content of 18:3ω3, known as a biomarker of plant materials, was the main factor to separate size groups of crabs in May and September. The δ 13 C value of sediment had high correlation with those of small-sized crabs at site 1 and 2 when 1-month time lag was applied to the value for crabs during the surveyed period. Conclusions: Based on the stable isotope and fatty acid results, the consumption habits of S. dehaani appear to be distinguished by sites and their size. In particular, smaller size of S. dehaani appears to be more dependent on fewer food sources and is influenced more by the diet sources from the sediments in Han River estuary.

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Section: Discussionsupporting

confidence: 90%

Intraspecific diet shifts of the sesarmid crab, Sesarma dehaani, in three wetlands in the Han River estuary, South Korea

Yang

Han

2019

j ecology environ

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“…Furthermore, sedimentary C/N ratios were closer to the ratios for marine phytoplankton, characterized by higher nitrogen-containing compounds (C/N around 6-10; Meyers 1994;Lamb et al 2006), thereby suggesting a lower contribution of terrestrial derived organic matter in sediments from the lower reaches of the RdlP. This isotopic (Middelburg and Nieuwenhuize 1998;Zimmerman and Canuel 2001;Lautenschlager et al 2014), indicating a higher contribution of 13 C-enriched marine sources to the allochthonous terrestrial sources towards the sea. The nMDS ordination analysis for isotope data and C/N ratios consistently grouped together samples from upper and lower reaches, while those of the middle reaches were dispersed into both groups.…”

Section: Organic Carbon Sources In Surface Sediments Within the Rdlpmentioning

confidence: 72%

“…Müller and Voss 1999;Malamud-Roam and Ingram 2001;Tue et al 2011;Remeikaitė-Nikienė et al 2016). This is because δ 13 C values are usually minimally affected by diagenetic processes in sediment organic matter (Thornton and McManus 1994;Lautenschlager et al 2014). Terrestrial material from C3 pathways exhibits δ 13 C values that range between -32 and -21‰.…”

mentioning

confidence: 99%

Linking patterns of freshwater discharge and sources of organic matter within the Río de la Plata estuary and adjacent marshes

Bergamino

Schuerch

Tudurí

et al. 2017

Mar. Freshwater Res.

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We investigated carbon isotopic ratios (δ13C) v. carbon to nitrogen (C : N) ratios for surface sediments throughout a large estuarine system (Río de la Plata, RdlP), combined with sediment cores from adjacent marshes to infer main carbon sources. We also evaluated the influence of the El Niño–Southern Oscillation (ENSO) and associated high freshwater-discharge events on the organic-matter transport within the estuary. The isotopic pattern in surface sediments of the RdlP showed the upper reaches to be influenced by riverine particulate matter (δ13C range: –24 to –26‰). Similarly, in the sediment cores from marshes of the upper reaches, δ13C values decreased from –24‰ in ancient sediments to –28‰ in recent sediments, reflecting an increased contribution of organic matter from land, including C3 plants and freshwater phytoplankton, during the past 50 years. However, the lower reaches represent a depositional environment of marine algae (δ13C range: –21 to –23‰), with no influence of detritus from adjacent marshes, indicating minor erosion of the marshes in the lower reaches operating as carbon-sink habitats. Our isotopic analysis showed that the transport and deposition of terrigenous organic matter within the RdlP and adjacent marsh habitat appear to be both temporally and spatially linked to hydrology patterns.

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“…The sediments of the Coorong Lagoons have an abundance of bivalves, particularly A. helmsi (Chamberlayne, 2015), offering potential for reconstruction of past environmental change relevant to contemporary issues. Common in southern Australian estuaries (Matthews & Constable, 2004; Whisson et al., 2004; Lautenschlager et al., 2014), A. helmsi is an aragonitic micromollusc (Chamberlayne et al., 2020) that experiences continuous growth over a short lifespan of up to 1 year (Chamberlayne et al., 2020; Wells & Threlfall, 1982b). A monitoring study in a Western Australian estuary reported broad salinity (15–55) and temperature tolerances (18–32°C; Wells & Threlfall, 1982a).…”

Section: Introductionmentioning

confidence: 99%

Controls Over Oxygen Isotope Fractionation in the Waters and Bivalves (Arthritica helmsi) of an Estuarine Lagoon System

Chamberlayne

Tyler

Gillanders

2021

Geochem Geophys Geosyst

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Oxygen isotope ratios in bivalve shells have long been used as a proxy for environmental change, reflecting both temperature and the oxygen isotope composition of host water. In estuarine systems, the oxygen isotope composition of water is complicated by variable mixing between river and seawater, as well as evaporative enrichment. In addition, due to species‐specific variation in temperature‐dependent fractionation into bivalve carbonate, modern calibrations are necessary prior to applications in paleoenvironmental studies. In this study, live specimens of the micromollusc Arthritica helmsi were collected from five sites in the Coorong Lagoon, an estuarine system at the mouth of the River Murray, Australia, on six occasions from November 2016 to May 2018. Whole shell oxygen and carbon isotope compositions (n = 131) were measured alongside monthly temperature and oxygen and hydrogen isotope analyses of waters from the Coorong and neighboring Lake Alexandrina (n = 137). Oxygen and hydrogen isotope ratios in water were mostly controlled by evaporation of source waters, though a period of high river water discharge was reflected in the isotopic values of the Coorong North Lagoon. A species‐specific temperature‐dependent oxygen isotope fractionation equation was calibrated for A. helmsi: T (°C) = (21.39 ± 0.45) − (4.43 ± 0.38) × (δ18Oshell − δ18Owater). This equation is similar to other published paleotemperature equations for biogenic carbonates. These contemporary observations of the isotope hydrology of the Coorong, coupled with our contemporary calibration of oxygen isotope fractionation, lay the foundation for paleoenvironmental studies using bivalves collected from the sediments of the Coorong.

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Utilization of organic matter by invertebrates along an estuarine gradient in an intermittently open estuary

Cited by 15 publications

References 76 publications

Intraspecific diet shifts of the sesarmid crab, Sesarma dehaani, in three wetlands in the Han River estuary, South Korea

Intraspecific diet shifts of the sesarmid crab, Sesarma dehaani, in three wetlands in the Han River estuary, South Korea

Linking patterns of freshwater discharge and sources of organic matter within the Río de la Plata estuary and adjacent marshes

Controls Over Oxygen Isotope Fractionation in the Waters and Bivalves (Arthritica helmsi) of an Estuarine Lagoon System

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