Comparative trophic structures of macrobenthic food web in two macrotidal wetlands with and without a dike on the temperate coast of Korea as revealed by stable isotopes

Park, Hyun Je; Kang, Hee Yoon; Park, Tae Hee; Kang, Chang‐Keun

doi:10.1016/j.marenvres.2017.09.018

Cited by 21 publications

(10 citation statements)

References 60 publications

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“…For herbivores/grazers, detritivores, filter feeders and omnivores, the mean TEFs are 0.4‰ AE 1.3‰ for δ 13 C and 2.2‰ AE 0.3‰ for δ 15 N (Park et al 2017, Carvalho et al 2020. For carnivores/predators, the mean TEFs are 0.96‰ AE 0.26‰ for δ 13 C and 3.3‰ AE 0.26‰ for δ 15 N (Park et al 2017, Wang et al 2021). The dietary proportions for this model were expressed as 2.5%, 25%, 50%, 75%, and 99% credible intervals.…”

Section: Statistical Analysis and Modelingmentioning

confidence: 99%

“…The main advantage of using this framework is that it calculates the possible contribution of food sources to consumers by considering the mean and SD of stable isotopes and TEFs (Parnell et al 2010). For herbivores/grazers, detritivores, filter feeders and omnivores, the mean TEFs are 0.4‰ AE 1.3‰ for δ 13 C and 2.2‰ AE 0.3‰ for δ 15 N (Park et al 2017, Carvalho et al 2020. For carnivores/predators, the mean TEFs are 0.96‰ AE 0.26‰ for δ 13 C and 3.3‰ AE 0.26‰ for δ 15 N (Park et al 2017, Wang et al 2021).…”

Section: Statistical Analysis and Modelingmentioning

confidence: 99%

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Eutrophication reduces seagrass contribution to coastal food webs

et al. 2021

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Food sources and food web structure in seagrass meadows are important determinants of ecosystem functions and services. However, there is little information on the effect of eutrophication on food source contributions and food web structure in seagrass meadows. Here we used stable isotopes of carbon and nitrogen (δ 13 C and δ 15 N) to investigate how do different levels of nutrient enrichment affect the diets of consumers and food web structure within tropical seagrass meadows. We found that the diet contributions of macroalgae (mean 24% AE 12% for fish, 21% AE 5% for invertebrates), particulate organic matter (mean 19% AE 12% for fish, 18% AE 8% for invertebrates), and sediment organic matter (mean 24% AE 13% for fish, 21% AE 8% for invertebrates) to fish and invertebrates were all higher in seagrass meadows with higher nutrient concentrations, while seagrass and epiphytes contributed more to consumers in seagrass meadows with lower nutrient concentrations. Meanwhile, higher nutrient concentrations decreased the trophic position (mean 2.6 AE 0.5 in high-nutrient level, 3.4 AE 0.6 in low-nutrients level) of consumers and food chain length (2.5 in high-nutrient level, 2.9 in lownutrients level). Higher nutrient concentrations reduced the contribution of seagrass carbon to consumers through the grazing food chain, but enhanced the flow of macroalgal carbon to consumers through the grazing food chain. Overall, eutrophication modified the food web structure of seagrass meadows. We recommend that measures be taken to decrease nutrient input into seagrass ecosystems to maintain its important functions and services.

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Section: Statistical Analysis and Modelingmentioning

confidence: 99%

Section: Statistical Analysis and Modelingmentioning

confidence: 99%

Eutrophication reduces seagrass contribution to coastal food webs

et al. 2021

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“…In the YRE, isotopic comparisons among the sites displayed no significant spatial differences in consumers and there much narrower ranges of δ 13 C values than those observed in the SRE. Despite the various feeding styles of macrobenthic consumers, such narrow δ 13 C ranges may reflect the utilization of similar dietary items (Park et al 2017). The δ 13 C values of most consumers at all of the sites were very similar to those of EPOM, which suggests a high contribution of phytoplankton-derived organic matter in their diets and very little contribution of RPOM or P. australis.…”

Section: Spatial and Seasonal Variability In Food Web Structure In The Diked And Natural Systemsmentioning

confidence: 99%

“…In addition, estuarine systems have diverse habitats resulting from the distribution zones of specific plant communities and are characterized by spatial heterogeneity of biotic and environmental factors (Bertness and Pennings 2000). The loss and fragmentation of diverse intertidal habitats caused by hydrological changes resulting from the construction of dikes or dams may lead to severe modification of carbon/energy flow and food web structure in estuarine systems (Talley 2000;Wissel and Fry 2005;Park et al 2017). In the YRE, the estuarine dikes have seriously modified coastal wetlands and greatly reduced habitats (by about 280 km 2 ) of bare intertidal flats and saltmarsh plant communities (Kim et al 2017b).…”

Section: Spatial and Seasonal Variability In Food Web Structure In The Diked And Natural Systemsmentioning

confidence: 99%

“…In the YRE, the estuarine dikes have seriously modified coastal wetlands and greatly reduced habitats (by about 280 km 2 ) of bare intertidal flats and saltmarsh plant communities (Kim et al 2017b). Therefore, the construction of the dike in the YRE might result in reduced biomass of benthic primary producers (e.g., benthic microalgae, macroalgae, and saltmarsh plants) from habitat loss, leading to a reduction of food availability for macrobenthic consumers (Park et al 2017).…”

Section: Spatial and Seasonal Variability In Food Web Structure In The Diked And Natural Systemsmentioning

confidence: 99%

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Trophic Structures of Two Contrasting Estuarine Ecosystems With and without a Dike on the Temperate Coast of Korea as Determined by Stable Isotopes

Park

Kwak

Lee

et al. 2019

Estuaries and Coasts

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To evaluate the modification of carbon flow in estuarine systems by a dike construction, we compared the trophic structures of the macrobenthic food webs in two contrasting estuaries, one with and one without a dike, on the western and southern coasts of Korea, by measuring the δ 13 C and δ 15 N values of subtidal macrobenthic consumers. The isotopic values of most organic matter sources were similar between the two estuaries, but there was a different pattern in the isotopic spatial variability between them. For the consumer δ 13 C values in the diked estuary, there were no significant spatial differences among sites and the isotopic niche widths were much narrower than those in the dike-free estuary. Moreover, the indices of community-wide metrics were smaller in the diked estuary than in the dike-free estuary. These results suggest a lower trophic diversity of macrobenthic consumers with their increased trophic redundancy in the diked estuary. These differences between the dike and dike-free estuaries might be explained by the decrease of benthic producers and then their lower food availabilities for consumers resulting from the presence of the dike. Our findings provide evidence that dike construction and subsequent alteration of hydrologic and circulation processes may lead to modification of the trophic structure of estuarine macrobenthic communities.

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Intraspecific facilitation explains the persistence of Phragmites australis in modified coastal wetlands

et al. 2019

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Coastal exploitation and human‐mediated modifications have markedly altered the community composition and functioning of coastal wetlands worldwide. Although recent work has shown that harnessing positive density‐dependent feedbacks can greatly enhance the recovery of habitat‐modifying species in degraded wetlands, the role of these intraspecific feedbacks in explaining the persistence of altered, unfavorable plant communities remains largely unexplored. Here, we experimentally tested whether intraspecific facilitation may explain the persistence of common reed (Phragmites australis) in human‐modified coastal wetlands. We performed a full‐factorial mesocosm experiment crossing low‐density pioneer versus high‐density established development stages with saline (20 psu) versus freshwater conditions. Results showed a clear shift in plant growth response from intraspecific competition under freshwater conditions to self‐facilitation in saline treatments. We identified two positive feedback mechanisms enabling the established treatment to overcome salinity stress: (1) Enhanced root oxygenation of the sediment at higher plant density decreased accumulation and intrusion of phytotoxic sulfide, and (2) density‐dependent rainwater infiltration into the soil lowered salinity in the dense root mat, preventing salt stress. Our study demonstrates that intraspecific facilitation can be an important factor in explaining the persistence of Phragmites australis in coastal wetlands. We emphasize the importance of integrating positive interactions in coastal restoration but argue that they should either be harnessed when restoring vegetation or broken when eradication of nontarget species is the management objective.

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Comparative trophic structures of macrobenthic food web in two macrotidal wetlands with and without a dike on the temperate coast of Korea as revealed by stable isotopes

Cited by 21 publications

References 60 publications

Eutrophication reduces seagrass contribution to coastal food webs

Eutrophication reduces seagrass contribution to coastal food webs

Trophic Structures of Two Contrasting Estuarine Ecosystems With and without a Dike on the Temperate Coast of Korea as Determined by Stable Isotopes

Intraspecific facilitation explains the persistence of Phragmites australis in modified coastal wetlands

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