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

Park, Hyun Je; Kwak, Jin Ho; Lee, Young Jae; Kang, Hee Yoon; Choy, Eun Jung; Kang, Chang‐Keun

doi:10.1007/s12237-019-00522-4

Cited by 14 publications

(3 citation statements)

References 66 publications

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“…Hence, the notable changes in algal species' diversity are likely due to the control of sea urchin which might allow the introduction of a wide range of producers, thus supporting the introduction of more diverse consumers. Therefore, diverse and abundant food sources could lead to a higher trophic diversity and a lower trophic redundancy of the consumer community at the restored bed of the first year (e.g., Layman et al, 2007b;Abrantes and Sheaves, 2009;Wang et al, 2016;Park et al, 2020). Abrantes et al (2014) have demonstrated that the low trophic diversity and SEA in estuarine fish food webs are due to a low producer availability caused by the high level of loaded suspended sediments, which can restrict primary productivity in the water.…”

Section: Changes In the Food Web Structure During Recoverymentioning

confidence: 99%

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Evaluation of Food Web Structure and Complexity in the Process of Kelp Bed Recovery Using Stable Isotope Analysis

et al. 2022

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Kelp forests have declined gradually all over the world. Understanding the trophic structure of such a productive and diverse ecosystem is crucial for its restoration and effective management. Few studies, however, have focused on the trophic structure and functional recovery of kelp forests in the process of restoration. This study was conducted in the eastern coast of Korea where kelp bed restoration was in process with the removal of sea urchins. In addition to quantitative measurement for recovery using common community parameters, we investigated how fast the stability of a food web structure could be established in the newly restored kelp beds with an initially barren condition, using stable isotope analysis, in comparison with a nearby natural bed and barren site. At the restored bed, total algal biomass and diversity reached the levels of the natural bed within 1 year. While the δ13C and δ15N values of macroalgae and organic matter were separated isotopically, they were similar among sites, excluding organic matter at the natural bed in 2019. Most consumers showed similar isotopic values among sites, with overlapping range for δ13C of producers. However, some herbivores showed higher δ15N values as predators/omnivores, particularly at barrens, which could be explained by trophic plasticity depending on the macroalgal structure. In the restored bed, for the first year, higher trophic diversity (CR, CD) and lower trophic redundancy (MNND, SDNND) showed non-overlapping >50% CIs among sites. However, this distinctive stage moved toward the natural bed upon entering the second year as trophic diversity decreased and trophic redundancy increased while natural bed overlapped at<50% CIs. The recovery speed in this system was fast (1 year for quantitative perspectives and 2 years for functional completion). After removing the sea urchins, recruitment of macroalgae quickly increased concomitantly with consumer groups, boosting the diversity and trophic structure of the restored bed. The trophic structure of the first year of restoration was not an intermediate stage toward the completion, but a transient over-shooting state. This might have been triggered by the fast introduction of diverse macroalgae to the urchin-free bare rock space, providing an interesting finding needed to be tested in other temperate marine systems.

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Section: Changes In the Food Web Structure During Recoverymentioning

confidence: 99%

“…The only notable change observed was the diversity of macroalgae. Therefore, in the process of restoration, changes of food web structure are likely to be caused by changes of food source diversity rather than food abundance (Hogsden and Harding, 2014;Park et al, 2020;Gabara et al, 2021).…”

Section: Changes In the Food Web Structure During Recoverymentioning

confidence: 99%

Evaluation of Food Web Structure and Complexity in the Process of Kelp Bed Recovery Using Stable Isotope Analysis

et al. 2022

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“…The food sources of the upogebiid shrimps have been estimated using stable iso- topes (e.g., Yokoyama et al 2005b, Kanana et al 2007, Antonio & Richoux 2014, Bosley et al 2017, and were revealed to be mainly marine phytoplankton. In contrast, the stable carbon and nitrogen isotope ratios of Cryptomya have rarely been investigated, except for one study in which Park et al (2020) found that C. busoensis also consumes marine phytoplankton. The burrow host and associate having the same feeding habits suggests the occurrence of interspecific competition or trophic niche segregation in the burrow, but this possibility has not yet been tested by comparing food sources of the upogebiid shrimp and its commensal bivalve in a tidal flat.…”

Section: Introductionmentioning

confidence: 99%

Trophic segregation in a burrow: the stable carbon and nitrogen isotope ratios of the burrowing shrimp <i>Upogebia major</i> and its commensal bivalve <i>Cryptomya busoensis</i>

Seike

Gotô

2020

Plankton Benthos Res

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Burrows produced by marine invertebrates often harbor other small commensal invertebrates. The mud shrimp Upogebia is known to coexist with the myid bivalve Cryptomya in a burrow produced by the shrimp. Both species are filter-feeders, and thus interspecific competition or trophic niche segregation may occur in the burrow. Samples for carbon and nitrogen stable isotope analysis were collected from a tidal flat near the tidal inlet of Akkeshi Lake, Hokkaido, northern Japan in April 2013. In addition, stratified benthos sampling was conducted on the tidal flat in August 2018, to clarify the interspecific relationship between U. major and C. busoensis in the burrow. The stratified benthos sampling showed the vertical distribution of these species, and indicated that both species filter water from the same part of the burrow for feeding. The stable carbon and nitrogen isotope analysis showed that important food sources for both U. major and C. busoensis are marine phytoplankton and microphytobenthos. In addition, C. busoensis is likely to consume terrestrial organic matter whereas U. major is unable to utilize it. The partial trophic segregation between the species increases the potential benthic filtering because it allows the Upogebia burrow complex to consume a wide variety of organic matter, and it might reduce interspecific competition between the filter-feeding host and its commensal species. These results demonstrate how ecologically similar macrobenthos can coexist in a burrow.

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Trophic response to ecological conditions of habitats: Evidence from trophic variability of freshwater fish

Choi

Lee

Takizawa

et al. 2020

Ecology and Evolution

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To adapt to ecological and environmental conditions, species can change their ecological niche (e.g., interactions among species) and function (e.g., prey‐predation, diet competition, and habitat segregation) at the species and guild levels. Stable isotope analysis of bulk carbon and nitrogen of organisms has conventionally been used to evaluate such adaptabilities in the scenopoetic and bionomic views as the isotopic niche width. Compound‐specific stable isotope analysis (CSIA) of nitrogen within amino acids provides trophic information without any disruption of scenopoetic views in the isotope ratios, unlike conventional bulk isotope analysis provides both information and therefore frequently hinders its usefulness for trophic information. We performed CSIA of amino acids to understand the trophic variability of the pike gudgeon Pseudogobio esocinus and largemouth bass Micropterus salmoides as representative specialist and generalist fish species, respectively, from 16 ecologically variable habitats in the four major rivers of Korea. There was little variation (1 σ ) in the trophic position (TP) among habitats for P. esocinus (± 0.2); however, there was considerably large variation for M. salmoides (± 0.6). The TP of M. salmoides was negatively correlated with the benthic invertebrate indices of the habitats, whereas the TP of P. esocinus showed no significant correlation with any indices. Thus, these two representative fish species have different trophic responses to ecological conditions, which is related to known differences in the trophic niche between specialists (i.e., small niche width) and generalists (i.e., large niche width). Over the past four decades, the conventional bulk isotope analysis has not been capable of deconvoluting “scenopoetic” and “bionomic” information. However, in the present study, we demonstrated that the CSIA of amino acids could isolate trophic niches from the traditional ecological niche composed of trophic and habitat information and evaluated how biological and ecological indices influence the trophic response of specialists and generalists.

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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

Cited by 14 publications

References 66 publications

Evaluation of Food Web Structure and Complexity in the Process of Kelp Bed Recovery Using Stable Isotope Analysis

Evaluation of Food Web Structure and Complexity in the Process of Kelp Bed Recovery Using Stable Isotope Analysis

Trophic segregation in a burrow: the stable carbon and nitrogen isotope ratios of the burrowing shrimp <i>Upogebia major</i> and its commensal bivalve <i>Cryptomya busoensis</i>

Trophic response to ecological conditions of habitats: Evidence from trophic variability of freshwater fish

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