Effects of forest cover on richness of threatened fish species in Japan

Lavergne, Édouard; Kume, Manabu; Ahn, Hyojin; Henmi, Yasuhisa; Terashima, Yuki; Feng, Ye; Kameyama, Shuichi; Kai, Yoshiaki; Kadowaki, Kohmei; Kobayashi, Shiho; Yamashita, Yoh; Kasai, Atsushi

doi:10.1111/cobi.13849

Cited by 9 publications

(8 citation statements)

References 59 publications

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“…Moreover, forests surrounding rivers constitute efficient buffers against pollution caused by other land uses, such as agriculture, because the filtering capacity of the vegetation improves water quality, which influences aquatic communities (Aguiar et al, 2011 ; Effert‐Fanta et al, 2019 ; Riis et al, 2020 ). In Japan, for example, the higher richness of red‐listed fish species was associated with high percentages of forest cover in the catchments (Lavergne et al, 2021 ). Because the highest rates of forest loss were identified in important biodiversity regions, such as in Bolivia, Brazil, Nigeria and the Lower‐Mekong River basin, we can expect an increasing global rate and a net biodiversity loss in freshwaters (Leal et al, 2020 ).…”

Section: Discussionmentioning

confidence: 99%

Fish and macroinvertebrate assemblages reveal extensive degradation of the world's rivers

Feio

Hughes

Serra

et al. 2022

Global Change Biology

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Rivers suffer from multiple stressors acting simultaneously on their biota, but the consequences are poorly quantified at the global scale. We evaluated the biological condition of rivers globally, including the largest proportion of countries from the Global South published to date. We gathered macroinvertebrate‐ and fish‐based assessments from 72,275 and 37,676 sites, respectively, from 64 study regions across six continents and 45 nations. Because assessments were based on differing methods, different systems were consolidated into a 3‐class system: Good, Impaired, or Severely Impaired, following common guidelines. The proportion of sites in each class by study area was calculated and each region was assigned a Köppen‐Geiger climate type, Human Footprint score (addressing landscape alterations), Human Development Index (HDI) score (addressing social welfare), % rivers with good ambient water quality, % protected freshwater key biodiversity areas; and % of forest area net change rate. We found that 50% of macroinvertebrate sites and 42% of fish sites were in Good condition, whereas 21% and 29% were Severely Impaired, respectively. The poorest biological conditions occurred in Arid and Equatorial climates and the best conditions occurred in Snow climates. Severely Impaired conditions were associated (Pearson correlation coefficient) with higher HDI scores, poorer physico‐chemical water quality, and lower proportions of protected freshwater areas. Good biological conditions were associated with good water quality and increased forested areas. It is essential to implement statutory bioassessment programs in Asian, African, and South American countries, and continue them in Oceania, Europe, and North America. There is a need to invest in assessments based on fish, as there is less information globally and fish were strong indicators of degradation. Our study highlights a need to increase the extent and number of protected river catchments, preserve and restore natural forested areas in the catchments, treat wastewater discharges, and improve river connectivity.

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Section: Discussionmentioning

confidence: 99%

Fish and macroinvertebrate assemblages reveal extensive degradation of the world's rivers

Feio

Hughes

Serra

et al. 2022

Global Change Biology

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“…Interestingly, Akamatsu et al [21] found that at all stations, more species were detected by the eDNA method than by the traditional net sampling methods for fish capture. Also, Lavergne et al [22] conducted a survey on fish biodiversity in 32 selected rivers across Japan, including the Mukawa River, using eDNA. Water samples were taken from the river mouth and 12 OTUs (out of 16 at high tide, and 17 at low tide) that were detected in the river mouth were also detected in the present study.…”

Section: Discussionmentioning

confidence: 99%

“…The anadromous dace species are present in many regions of Northern Japan [19] and their biology has been studied in the Mukawa River and other rivers [20], but most species in the river have not been studied in the readily available literature. Even though the Mukawa coast is highly productive for fisheries, previous reports that included this river area were mostly limited to the downstream and coastal areas of the Mukawa River [21,22] (National Census of River Environments by Mistry of Land, Infrastructure, Transport and Tourism, Japan, http://www.nilim.go.jp/lab/fbg/ksnkankyo/; accessed on 5 April 2023), or were related to flooding and water quality effects on fish or shellfish [23,24].…”

Section: Introductionmentioning

confidence: 99%

Environmental DNA Characterization of the Fish Species Composition in the Mukawa River and Adjacent Habitats

Ahn,

Miller

2024

Fishes

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The diverse freshwater fish fauna of the Japanese archipelago is distributed among four main island landmasses, which include Hokkaido in the north, with many diadromous species. One relatively well-preserved river drainage along the southern coast of Central Hokkaido is the Mukawa River. Fish fauna surveys in the Mukawa River were mostly in downstream areas and the fish diversity is not well-documented among the upper, lower river, and coastal environments. Fish communities in the river, estuary, and sea were sampled using eDNA analysis to evaluate upstream and downstream species detections, and tidal and spatial detection variation near the river mouth. The number of species was higher at the river mouth and nearshore sites compared to the river and offshore. Fish detections reflected life history categories (freshwater resident, diadromous, brackish, or marine) and the environments. Similarity analysis showed that fish species compositions were divided into (1) upstream and midstream, (2) downstream and river mouth, (3) adjacent shore, and (4) offshore. Salmonid, cyprinid, loach, and sculpin species were detected in the river, compared to a mixture of species downstream and along the coast. This rapid assessment type study demonstrated that eDNA survey methodology would be effective for multiple river comparative surveys, seasonality studies, or evaluating possible effects of cross-river weirs or dams.

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“…In general, natural habitats have good conservation potential for specialist and narrow-ranged fish species. For example, river channels near forests can harbor more rare fish species, essentially contributing to local biodiversity 36 . Nevertheless, due to cropland expansion into the hilly and mountainous region, native and often endangered species associated with natural habitats could be replaced by cropland-associated and/or wide-ranging species, such as Osphronemus goramy or Boesemania microlepis , causing a loss of uniqueness and homogenization 33 .…”

Section: Discussionmentioning

confidence: 99%

Terrestrial land cover shapes fish diversity in major subtropical rivers

Zhang,

Blackman,

Furrer

et al. 2023

Preprint

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Freshwater biodiversity is critically affected by human modifications of terrestrial land use and land cover (LULC)1,2. Yet, knowledge of the spatial extent and magnitude of LULC-aquatic biodiversity linkages is still surprisingly limited, impeding the implementation of optimal management strategies3. Here, we compiled fish diversity data across a 160,000-km2subtropical river catchment in Thailand characterized by exceptional biodiversity4yet intense anthropogenic alterations5, and attributed fish species richness and community composition to contemporary terrestrial LULC across the catchment. We estimated a spatial range of LULC effects extending up to about 20 km upstream from sampling sites, and explained nearly 60 % of the variance in the observed species richness, associated with major LULC categories including croplands, forest, and urban areas. We find that integrating both spatial range and magnitudes of LULC effects is needed to accurately predict fish species richness. Further, projected LULC changes showcase future gains and losses of fish species richness across the river network and offer a scalable basis for riverine biodiversity conservation and land management, allowing for potential mitigation of biodiversity loss in highly diverse yet data-deficient tropical to sub-tropical riverine habitats.

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Effects of forest cover on richness of threatened fish species in Japan

Abstract: Agricultural and forest cover have opposite effects on the richness of redlisted fish species in Japanese estuaries.

Cited by 9 publications

References 59 publications

Fish and macroinvertebrate assemblages reveal extensive degradation of the world's rivers

Fish and macroinvertebrate assemblages reveal extensive degradation of the world's rivers

Environmental DNA Characterization of the Fish Species Composition in the Mukawa River and Adjacent Habitats

Terrestrial land cover shapes fish diversity in major subtropical rivers

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