Trophic importance of the seagrass Halophila ovalis in the food web of a Hepu seagrass bed and adjacent waters, Beihai, China

Jinlan, Lin; Liu, Xinming; Lai, Tinghe; Du, Jianguo; Zheng, Xinqing

doi:10.1016/j.ecolind.2021.107607

Cited by 11 publications

(5 citation statements)

References 66 publications

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“…This external N input was higher in Chandipur, Dhamra and Rushikulya locations of our study, through riverine input, whereas at Astaranga, this external N input was dominated by aquaculture outflows (Akhtar et al, 2021;Pradhan et al, 2009). Similar influence of external N input and variation in stable isotope signatures have been observed from the coast of India for P. coarctata (Saha et al, 2022) and from the coast of China for invasive saltmarsh species like Spartina alterniflora and other seagrass species (Du et al, 2019;Jiang et al, 2019;Lin et al, 2021). This external N input also supported the growth of salt-tolerant estuarine micro and macroalgae that were attached to the P. coarctata leaf and rhizome structures as epiphytes, as inferenced from δ 13 C isotopes of biomass (Figure 5c).…”

Section: Influence Of Seasonality On P Coarctata Traits and Carbon St...supporting

confidence: 77%

Mono-Specific Data Deficient Saltmarsh Species Has Climate Relevant Carbon Stocks From the East Coast of India

Mishra,

Dey,

Mishra

et al. 2024

Preprint

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Despite saltmarshes being considered as nature-based solutions (NbS) towards climate change mitigation, India’s saltmarsh ecosystems are least studied. This study quantifies the seasonal variation in carbon stocks mono-specific saltmarsh species (Porteresia coarctata) and its potential to play an important role in India’s climate change mitigation plans. Seasonal (pre-and post-monsoon) sampling of P. coarctata surface water, biomass and 30 cm sediment core was collected across four locations on the east coast of India to quantify sediment dry bulk density (DBD), organic matter (OM%), organic carbon (Corg%), Corg stocks of sediment and biomass, total carbon (C%) and nitrogen (N%) and stable isotopes of δ13C and δ15N. In general, the sediment DBD, OM and Corg of P. coarctata meadows was higher in post-monsoon and was influenced by salinity and pH changes. Isotope (δ13C) modelling of various sediment C sources suggested, particulate organic matter (POM) contribution was highest (0.04-0.79%) followed by P. coarctata (0.01–052%) and other macrophytes across our study locations. The seasonal variation of δ13C showed increased contribution of marine derived particulate and dissolved organic matter into P. coarctata meadows in post-monsoon season. Heavier δ15N values were observed in post-monsoon season suggesting anthropogenic input, that was utilized by P. coarctata to increase its above and below-ground biomass and shoot density. The combined ecosystem (30 cm sediment + biomass) Corg stocks of P. coarctata was 1.7-fold higher in post-monsoon (4021.20± 917 Mg C) compared to pre-monsoon (2297.36 ±647 Mg C) season among the four locations with a sediment Corg contribution >70%. Based on the International Panel for Climate Change Tier II assessment the P. coarctata meadows (443 ha) can help in avoiding the pre and post-monsoon emissions of 8431.34 and 14757.84 Mg CO2 respectively. The combined price of the total CO2 equivalent stored in P. coarctata meadows in pre- and post-monsoon is US$ 14.50 and US$ 25.38 million respectively. Further studies quantifying the NbS potential of P. coarctata mono-specific and mixed meadows of India’s coast is needed along with integration of saltmarsh ecosystems into India’s National Action Plan on Climate Change.

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Section: Influence Of Seasonality On P Coarctata Traits and Carbon St...supporting

confidence: 77%

Mono-Specific Data Deficient Saltmarsh Species Has Climate Relevant Carbon Stocks From the East Coast of India

Mishra,

Dey,

Mishra

et al. 2024

Preprint

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“…The Bayesian model includes isotopic variation in the baseline indictor, the consumer and in the trophic discrimination in order to provide a robust estimation of consumer TP at the population level. Bivalves with a relatively long lifespan can integrate the isotopic signature at a time scale and from different basal carbon sources, therefore it was commonly used as baseline organisms for estimating trophic level in coastal systems (Zanden and Rasmussen, 2001;Gong et al, 2017;Lin et al, 2021). However, bivalves were found at only a few sites in the scECS.…”

Section: Discussionmentioning

confidence: 99%

Trophic Plasticity of Bombay Duck (Harpadon nehereus) in the South-Central East China Sea Based on Stable Isotope Evidence

et al. 2021

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High trophic plasticity is often invoked to explain the successful expansion of many aquatic species. Bombay duck (BD) outcompete other traditionally commercial fishes in the East China Sea (ECS) in recent years, displaying a continuous and sharp increase of catches, however, little is known whether the competition advantage of BD was related to its trophic plasticity. Using stable isotope analysis (SIA), we investigated the trophic ecology of BD in the south-central ECS in two periods. Significant differences in δ13C and δ15N values were found between sampling months and among body sizes. Modal (95% credibility limits) estimation showed that BD’s trophic position (TP) gradually increased from 3.56 (3.31–3.82) in G1 (120–150 mm for body size) to 4.09 (3.69–4.50) in G5 (241–270 mm) in November, and from 3.37 (2.92–3.88) in G2 (151–180 mm) to 3.66 (3.07–4.23) in G4 (211–240 mm) in April, respectively, suggesting obvious ontogenetic variation of δ15N and TP. More importantly, the TP of BD within the same body size showed wide amplitude, indicating BD possess high trophic plasticity, and can capture prey from low to high trophic levels. Further quantitative analysis based on the MixSIAR model showed that BD mainly fed on zooplankton and fish, but its feeding habit was characterized by the consumption of gradually reduced zooplankton and increased fish associated with increased body size. Interestingly, the fish’s contribution to BD showed obvious seasonal variation. It can be explained by varied food availability in ECS. Relatively low fish prey in April forced BD to adjust its diet, adding the ingestion of shrimps and cephalopods corresponding to temporal variations in food availability. The present study provides the evidence that high trophic plasticity exists in the feeding strategy of BD, which is reflected in the ability to adjust the feeding preference according to nutritional needs and food environmental changes; thus, it is competitively advantageous and may partly explain why BD is becoming the predominant species and displays an extensive distribution in the ECS.

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“…In order to reduce the number of food sources in the calculations, E. acoroides and T. hemprichii, and their epiphytes were considered as a single group called seagrass and epiphyte, respectively. Meanwhile, POM and SOM were not considered as potential food sources of herbivores based on the published literature (Du et al, 2019;Lin et al, 2021). In addition, considering that SOM is a mixture of other primary food sources (i.e., seagrass, epiphytes, macroalgae, and POM) (Carlier et al, 2009;Xu et al, 2018), we excluded it from the mixing model.…”

Section: Discussionmentioning

confidence: 99%

Carbon Transfer Processes of Food Web and Trophic Pathways in a Tropical Eutrophic Seagrass Meadow

et al. 2021

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Seagrass meadows provide important habitats and rich organic carbon sources for consumers at different trophic levels but are threatened by accelerating eutrophication in coastal waters. Nevertheless, at present, carbon transfer processes throughout the food web and trophic pathways in eutrophic seagrass meadows are still poorly known. To resolve this issue, carbon sources of different trophic communities in a eutrophic tropical seagrass meadow [Xincun (XC) bay, South China Sea] under eutrophication were examined in summer and winter using dual stable isotopes. The δ13C value of omnivores and carnivores overlapped more with that of herbivores and planktivores/filter feeders, which mainly overlapped with that of epiphytes in summer and macroalgae in winter. Meanwhile, epiphytes and macroalgae exhibited high biomass and corresponding highest contribution to herbivores, omnivores, and carnivores in summer and winter, respectively. These results suggest that the grazing food chain was the main trophic pathway in this eutrophic seagrass meadow, and that the transfer of carbon flow in the grazing food chain was mainly dominated by the proliferating epiphytes or macroalgae carbon. In contrast, the contribution of seagrass to detritivores in both seasons was higher than that of other food sources. Our findings suggest that in eutrophic tropical seagrass meadows, the proliferation of epiphytes or macroalgae induced by high nutrient loading, as well as their seasonal changes, has a greater impact on the transfer of carbon in the grazing food chain than that in the detritus food chain, and the seagrass fueled the food web mainly through the detritus food chain.

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Trophic importance of the seagrass Halophila ovalis in the food web of a Hepu seagrass bed and adjacent waters, Beihai, China

Cited by 11 publications

References 66 publications

Mono-Specific Data Deficient Saltmarsh Species Has Climate Relevant Carbon Stocks From the East Coast of India

Mono-Specific Data Deficient Saltmarsh Species Has Climate Relevant Carbon Stocks From the East Coast of India

Trophic Plasticity of Bombay Duck (Harpadon nehereus) in the South-Central East China Sea Based on Stable Isotope Evidence

Carbon Transfer Processes of Food Web and Trophic Pathways in a Tropical Eutrophic Seagrass Meadow

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