Temporal distribution of primary and secondary production estimated from water quality data in the Seto Inland Sea, Japan

Nishijima, Wataru; Umehara, Akira; Yamamoto, Kazuo; Asaoka, Satoshi; Fujii, Naoki; Otani, Sosuke; Wang, Feng; Okuda, Tetsuji; Nakai, Satoshi

doi:10.1016/j.ecolind.2021.107405

Cited by 5 publications

(6 citation statements)

References 33 publications

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“…Consequently, even at a field scale, our predictions on ecosystem functions can be tested across field sites with varying quality of subsidies. Empirical methods to measure production exist for marine (Nishijima et al, 2021), terrestrial (Zheng et al, 2003), and freshwater ecosystems (Puts et al, 2022). In some instances (e.g., Eggert & Wallace, 2003), empirical studies of subsidies measured these ecosystem functions, while in others (e.g., Barrett et al, 2005; Bomkamp et al, 2004), it would be a small additional step to do so.…”

Section: Discussionmentioning

confidence: 99%

Cascading impacts of changes in subsidy quality on recipient ecosystem functioning

Osakpolor

Manfrin

Leroux

et al. 2023

Ecology

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Resource quantity and quality can differ between adjacent ecosystems, and these differences can impact subsidies exchanged between ecosystems. The quantity and quality of subsidies are rapidly changing in response to stressors associated with global environmental change, but while we have models to predict the effects of changes in subsidy quantity, we currently lack models to predict the effects of changes in subsidy quality on recipient ecosystem functioning. We developed a novel model to predict the effects of subsidy quality on recipient ecosystem biomass distribution, recycling, production, and efficiency. We parameterized the model for a case study of a riparian ecosystem subsidized by pulsed emergent aquatic insects. In this case study we focused on a common measure of subsidy quality that differs between riparian and aquatic ecosystems: the higher content of long‐chain polyunsaturated fatty acids (PUFAs) in aquatic ecosystems. We analyzed how changes in the PUFA concentration of aquatic subsidies affect the dynamics in biomass stocks and functions of the riparian ecosystem. We also conducted a global sensitivity analysis to identify key drivers of subsidy impacts. Our analysis showed that subsidy quality increased the functioning of the recipient ecosystem. Recycling increased more strongly than production per unit subsidy quality increase, meaning there was a threshold where an increase in subsidy quality led to stronger effects of subsidies on recycling relative to the production of the recipient ecosystem. Our predictions were most sensitive to basal nutrient input, highlighting the relevance of recipient ecosystem nutrient levels to understanding the effects of ecosystem connections. We argue that recipient ecosystems that rely on high‐quality subsidies, such as aquatic–terrestrial ecotones, are highly sensitive to changes in subsidy–recipient ecosystem connections. Our novel model unifies the subsidy hypothesis and food quality hypothesis and provides testable predictions to understand the effects of ecosystem connections on ecosystem functioning under global changes.

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Section: Discussionmentioning

confidence: 99%

Cascading impacts of changes in subsidy quality on recipient ecosystem functioning

Osakpolor

Manfrin

Leroux

et al. 2023

Ecology

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“…We carried out this research in the coastal area of Ikuchijima Island, which is in the central region of the Seto Inland Sea (SIS) and far from the two channels (Bungo channel and Kii channel) which connect to the Pacific Ocean Environments 2024, 11, 60 3 of 17 (Figure 1b,c). This island appeared to be more influenced by terrestrial factors, such as freshwater discharge, than oceanic currents, which seem to be nearly uniform around the entire island [24,55]. The water temperature in the study area rises by 10 • C from early April to August, peaking in the summer [56].…”

Section: Study Areamentioning

confidence: 99%

“…However, the substantial expansion in agricultural activities has led to a notable surge in the discharge of domestic and agricultural pollutants, exerting a substantial impact on the island's marine ecosystem [61]. This scenario indicates that nutrient loading predominantly arises from terrestrial sources [24,55].…”

Section: Study Areamentioning

confidence: 99%

“…For example, seasonal changes in physical and biogeochemical factors, such as temperature and salinity, as well as nutrient loadings can significantly impact the abundance and composition of fish communities [20,21]. During the rainy season, high freshwater discharge can modify environmental conditions, leading to seasonal fluctuations in temperature, salinity, and nutrient loadings [22][23][24]. Variations in nutrient loadings influence the production and biomass of phytoplankton, impacting competition for resources and predator-prey dynamics [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

“…During the rainy season, high freshwater discharge can modify environmental conditions, leading to seasonal fluctuations in temperature, salinity, and nutrient loadings [22][23][24]. Variations in nutrient loadings influence the production and biomass of phytoplankton, impacting competition for resources and predator-prey dynamics [24][25][26]. Seasonal seawater temperature patterns impact the metabolism of fish species, the activities of larvae, and the distribution of fish eggs [20,[27][28][29].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of the Effects of Environmental Factors on Seasonal Variations in Fish Diversity on a Coastal Island in Western Japan

Nhat,

Saito,

Hamada

et al. 2024

Environments

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Coastal habitats are crucial for supporting ecological processes and serve as vital ecosystems for diverse fish species, providing essential functions such as feeding, nursery provision, and reproductive habitats. Fish communities are ecologically important components of coastal ecosystems and are affected by multiple environmental factors. Despite their importance, determining the effects of environmental factors on seasonal variations in fish species diversity and community dynamics remains a challenge. The advent of environmental DNA (eDNA) technology, an environmentally conscious approach, has resulted in considerable advancements in recent years and has been progressively adopted for marine fish population monitoring. Here, we used environmental DNA metabarcoding to study seasonal variations in fish community structure on a coastal island, and we assessed the effects of environmental factors in structuring these communities. Our findings revealed a rich diversity of 72 fish species across 40 families and 23 orders in the seawater surrounding an island of the Seto Inland Sea (SIS), Western Japan. Notably, the composition of fish communities varied significantly between seasons, with seawater temperature, salinity, and dissolved inorganic phosphorus (DIP) concentration identified as important factors correlated with fish communities’ structures. In conclusion, our study provides useful information of fish diversity, and we suggest that eDNA is a valuable technique for monitoring fish diversity in coastal areas. These findings are crucial for ecological studies and the environmental monitoring of oceanic coastal environments.

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Top-down and bottom-up coupling effects of subsidies on recipient ecosystems

Osakpolor,

Manfrin,

Leroux

et al. 2024

Theor Ecol

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A subsidy can directly enter a recipient ecosystem by either being consumed or being recycled to the nutrient pool with both pathways causing multiple indirect and potentially conflicting effects. Subsidy pathways are prone to anthropogenic stressors, which can impact the relative strength of the recycling and direct consumption fluxes. Current studies have mainly focused on a single coupling pathway, limiting our knowledge of subsidy effects on recipient ecosystems. We derive a series of models to predict the relative and interactive effects between consumption and recycling subsidy coupling pathways on the biomass and functions of a recipient ecosystem. We solved the models for analytical equilibria, and compared model predictions with and without each subsidy pathway. Our results show that the direct consumption and recycling coupling pathways of subsidies interact antagonistically, as the feedbacks between both pathways led to lower stocks and functions of the recipient ecosystem than a model which omits these feedbacks. These subsidy effects are consistent for each trophic level of the recipient ecosystem. Our models also predicted that consumption and recycling pathways of subsidies had differential effects on the recipient ecosystem. Recycling coupling pathway always led to equal or higher stocks and functions across recipient ecosystem trophic levels, whereas consumption couplings had alternating positive and negative effects depending on trophic level and characteristic of a trophic cascade. We suggest that future empirical and theoretical research on subsidies should consider various coupling pathways to provide a more mechanistic understanding of the effects of subsidies.

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Temporal distribution of primary and secondary production estimated from water quality data in the Seto Inland Sea, Japan

Cited by 5 publications

References 33 publications

Cascading impacts of changes in subsidy quality on recipient ecosystem functioning

Cascading impacts of changes in subsidy quality on recipient ecosystem functioning

Evaluation of the Effects of Environmental Factors on Seasonal Variations in Fish Diversity on a Coastal Island in Western Japan

Top-down and bottom-up coupling effects of subsidies on recipient ecosystems

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