Shoreline bank construction modifies benthic–pelagic coupling of food webs

Doi, Hideyuki; Chang, Kwang‐Hyeon; Ando, Takamitsu; Imai, Hideki; Nakano, Shinichi

doi:10.1016/j.ecoleng.2009.12.017

Cited by 11 publications

(4 citation statements)

References 23 publications

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“…Some fish species along armoured shorelines fed less on terrestrial (Toft et al 2007) or epibenthic prey (Morley, Toft & Hanson 2012), or switched from feeding on preferred epibenthic prey to plankton (Munsch, Cordell & Toft 2015b). We did not find any studies of armouring effects on coastal and estuarine fish diets outside of Puget Sound, but there is evidence that effects occur elsewhere, for example in lakes in Japan (Doi et al 2010).…”

Section: Documented Effects Of Shoreline Armouring On Fishcontrasting

confidence: 55%

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Effects of shoreline armouring and overwater structures on coastal and estuarine fish: opportunities for habitat improvement

Munsch

Cordell

Toft

2017

Journal of Applied Ecology

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Summary Nearshore ecosystems are increasingly recognized as critical habitats for fish of cultural, ecological and economic significance. These ecosystems are often densely inhabited by juvenile fish, highly productive and refuges from predation, leading ecologists to characterize them as nurseries. However, nearshore ecosystems are being transformed globally to support demands of growing coastal populations. Many shorelines are modified by armouring (e.g. seawalls, riprap) that minimizes erosion, and overwater structures (e.g. piers, docks) that facilitate waterfront use. These modifications affect the ecology of nearshore systems by restructuring, eliminating and shading shallow waters. Here, we review literature examining effects of armouring and overwater structures on coastal and estuarine fishes, and discuss how research and management can coordinate to minimize negative effects. Along armoured shorelines, fish assemblages differed from unarmoured sites, fish consumed less epibenthic and terrestrial prey, beach spawning was less successful and fish were larger. Under large overwater structures, visually oriented fish were less abundant and they fed less. Shade from overwater structures also interrupted localized movements of migratory fish. Thus, shoreline modifications impaired habitats by limiting feeding, reproduction, ontogenetic habitat shifts from shallow to deeper waters and connectivity. Research suggests that restoring shallow waters and substrate complexity, and minimizing shading underneath overwater structures, can rehabilitate habitats compromised by shoreline modifications. Synthesis and applications. Shoreline armouring and overwater structures often compromise fish habitats. These threats to nearshore fish habitats will become more severe as growing coastal populations and rising sea levels increase demands for shoreline infrastructure. Our ability to assess and rehabilitate nearshore fish habitats along modified shorelines will be enhanced by: focusing research attention on metrics that directly indicate fish habitat quality; implementing and evaluating shoreline features that repair compromised habitat functions within human‐use constraints; collating natural history knowledge of nearshore ecosystems; and embracing the socio‐ecological nature of habitat improvements by educating the public about conservation efforts and fostering appreciation of local nearshore ecosystems. Actions to reduce impacts of shoreline modifications on fish are particularly feasible when they align with societal goals, such as improving flood protection and providing spaces that facilitate recreation, education, and connections between people and nature.

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Section: Documented Effects Of Shoreline Armouring On Fishcontrasting

confidence: 55%

“…We did not find any studies of armouring effects on coastal and estuarine fish diets outside of Puget Sound, but there is evidence that effects occur elsewhere, for example in lakes in Japan (Doi et al . ).…”

Section: Documented Effects Of Shoreline Armouring On Fishmentioning

confidence: 97%

Effects of shoreline armouring and overwater structures on coastal and estuarine fish: opportunities for habitat improvement

Munsch

Cordell

Toft

2017

Journal of Applied Ecology

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“…Since their introduction in the 1970s, LB has become a species of concern in South Korea due to their rapid growth rate and aggressive feeding behavior on a wide range of prey items including benthic insects, macroinvertebrates, and small fish . LB also undergoes an ontogenetic dietary shift and their diet varies substantially, even as adults, across habitat and the level of anthropogenic impact . All fish were measured for body length (standard length) and wet weight and transported to the Department of Marine Sciences and Convergent Technology, Hanyang University, where they were dissected for dorsal muscle tissue and stored in acid-cleaned conical tubes at −20 °C prior to analyses.…”

Section: Methodsmentioning

confidence: 99%

“…35 LB also undergoes an ontogenetic dietary shift and their diet varies substantially, even as adults, across habitat and the level of anthropogenic impact. 40 All fish were measured for body length (standard length) and wet weight and transported to the Department of Marine Sciences and Convergent Technology, Hanyang University, where they were dissected for dorsal muscle tissue and stored in acid-cleaned conical tubes at −20 °C prior to analyses. All muscle tissues were freeze-dried for 48 h and homogenized using acid-cleaned mortar and pestles.…”

Section: Site Description and Samplingmentioning

confidence: 99%

Ecological Traits of Fish for Mercury Biomonitoring: Insights from Compound-Specific Nitrogen and Stable Mercury Isotopes

Yang

Kwon

Tsui

et al. 2022

Environ. Sci. Technol.

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We coupled compound-specific isotopic analyses of nitrogen (N) in amino acids (δ15NGlu, δ15NPhe) and mercury stable isotopes (δ202Hg, Δ199Hg) to quantify ecological traits governing the concentration, variability, and source of Hg in largemouth bass (LB) and pike gudgeon (PG) across four rivers, South Korea. PG displayed uniform Hg concentration (56–137 ng/g), trophic position (TPcorrected; 2.6–3.0, n = 9), and N isotopes in the source amino acid (δ15NPhe; 7–13‰), consistent with their specialist feeding on benthic insects. LB showed wide ranges in Hg concentration (45–693 ng/g), TPcorrected (2.8–3.8, n = 14), and δ15NPhe (1.3–16‰), reflecting their opportunistic feeding behavior. Hg sources assessed using Hg isotopes reveal low and uniform Δ199Hg in PG (0.20–0.49‰), similar to Δ199Hg reported in sediments. LB displayed site-specific δ202Hg (−0.61 to −0.04‰) and Δ199Hg (0.53–1.09‰). At the Yeongsan River, LB displayed elevated Δ199Hg and low δ15NPhe, consistent with Hg and N sourced from the atmosphere. LB at the Geum River displayed low Δ199Hg and high δ15NPhe, both similar to the isotope values of anthropogenic sources. Our results suggest that a specialist fish (PG) with consistent ecological traits and Hg concentration is an effective bioindicator species for Hg. When accounting for Hg sources, however, LB better captures site-specific Hg sources.

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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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Shoreline bank construction modifies benthic–pelagic coupling of food webs

Cited by 11 publications

References 23 publications

Effects of shoreline armouring and overwater structures on coastal and estuarine fish: opportunities for habitat improvement

Effects of shoreline armouring and overwater structures on coastal and estuarine fish: opportunities for habitat improvement

Ecological Traits of Fish for Mercury Biomonitoring: Insights from Compound-Specific Nitrogen and Stable Mercury Isotopes

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

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