Response of aquatic insects along gradients of agricultural development and flood magnitude in northern Japanese streams

Sueyoshi, Masanao; Tojo, Koji; Ishiyama, Nobuo; Nakamura, Futoshi

doi:10.1007/s00027-017-0547-y

Cited by 8 publications

(9 citation statements)

References 43 publications

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“…Large wood, sediment, and flow are the 3 key components of dynamic river ecosystems (Nakamura et al 2017). We considered large wood and sediment candidate explanatory variables, but we did not measure flow regime, although the impacts of flow disturbance on freshwater biodiversity can change with agricultural development (e.g., Sueyoshi et al 2017). In addition, local habitat quality and the spatial configuration of habitat in watercourse networks affect species diversity and abundance (e.g., Ishiyama et al 2014Ishiyama et al , 2015.…”

Section: Discussionmentioning

confidence: 99%

“…1998; Sueyoshi et al. 2017). Underlying geology, as well as anthropogenic land use, intrinsically controls aquatic habitat conditions, such as substrate composition and water chemistry (Carrie et al.…”

Section: Introductionmentioning

confidence: 99%

“…Running waters are among the most threatened ecosystems (Vörösmarty et al 2010). The conversion of forest to farmland in catchments has substantially altered the physicochemical conditions of stream ecosystems, such as streambed materials and water quality, resulting in the loss of biodiversity (Harding et al 1998;Sueyoshi et al 2017). Underlying geology, as well as anthropogenic land use, intrinsically controls aquatic habitat conditions, such as substrate composition and water chemistry (Carrie et al 2015;Tashiro & Tsujimoto 2015).…”

Section: Introductionmentioning

confidence: 99%

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Geology‐dependent impacts of forest conversion on stream fish diversity

Ishiyama

Miura

Inoue

et al. 2020

Conservation Biology

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Forest conversion is one of the greatest global threats to biodiversity, and land-use change and subsequent biodiversity declines sometimes occur over a variety of underlying geologies. However, how forest conversion and underlying geology interact to alter biodiversity is underappreciated, although spatial variability in geology is considered an integral part of sustaining ecosystems. We aimed to examine the effects of forest conversion to farmland, the underlying geology, and their interaction on the stream fishes' diversity, evenness, and abundance in northeastern Japan. We disentangled complex pathways between abiotic and biotic factors with structural equation modeling. Species diversity of stream fishes was indirectly shaped by the interaction of land use and underlying geology. Diversity declined due to nutrient enrichment associated with farmlands, which was mainly the result of changes in evenness rather than by changes in species richness. This impact was strongest in streams with volcanic geology with coarse substrates probably because of the differential responses of abundant stream fishes to nutrient enrichment (i.e., dominance) and the high dependency of these fishes on large streambed materials during their life cycles. Our findings suggest that remediation of deforested or degraded forest landscapes would be more efficient if the interaction between land use and underlying geology was considered. For example, the negative impacts of farmland on evenness were larger in streams with volcanic geology than in other stream types, suggesting that riparian forest restoration along such streams would efficiently provide restoration benefits to stream fishes. Our results also suggest that land clearing around such streams should be avoided to conserve species evenness of stream fishes.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geology‐dependent impacts of forest conversion on stream fish diversity

Ishiyama

Miura

Inoue

et al. 2020

Conservation Biology

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“…The composition of the EPT genera of the four streams of low habitat integrity was influenced by the mean variation in the precipitation (related to the hydrological cycle between seasons), with the composition of these streams becoming more similar to that of the high-integrity streams during the rainy season. This means that shifts in the composition of the EPT community are also influenced by the flood pulse, which tends to provoke natural disturbances in the heterogeneity of the community, and changes in energy flow and the availability of microhabitats, which combine to have a direct effect on the structure of the EPT communities (Turić et al 2015, Sueyoshi et al 2017. In addition to these seasonal shifts in habitat characteristics, such as the stream structure and physicochemical gradients, the composition and density of the organisms found in a stream may be influenced by its drag, which is determined by the peaks in its discharge (Collier & Quinn 2003, Castro et al 2013.…”

Section: Discussionmentioning

confidence: 99%

Effects of Environmental Variables and Habitat Integrity on the Structure of the Aquatic Insect Communities of Streams in the Cerrado-Caatinga Ecotone in Northeastern Brazil

et al. 2020

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Alterations in the environmental gradients of streams have a direct influence on the structure of the insect communities of the orders Ephemeroptera, Plecoptera, and Trichoptera (EPT), which are extremely sensitive to changes in habitat. The present study evaluated how habitat integrity in streams influence the composition of EPT genera, by testing three hypotheses: (i) the composition of the EPT genera is modified along the gradient of environmental disturbance; (ii) the composition of the EPT genera is more homogeneous in gradients with a higher degree of anthropogenic disturbance, and (iii) the greatest degree of environmental disturbance along the gradient results in the reduction of the richness and abundance of EPT genera. The study focused on 14 tributaries of the middle Itapecuru River, within an area of ecotone between the Brazilian Cerrado and Caatinga biomes. Data on the structure and physicochemical traits of the streams were collected between September 2014 and July 2015, a period that covers both the dry and rainy seasons in the study region. The results of the present study indicate that the composition of the EPT genera is modified in accordance with the variation in the habitat integrity, although, in contrast with expectations, more impacted areas had a more heterogeneous composition than undisturbed ones. The areas with more integrated landscapes contribute positively to the richness and abundance of EPT genera of the streams of the Cerrado-Caatinga ecotone. Given this, habitat integrity provide an important predictor of EPT diversity in the streams of the Cerrado-Caatinga ecotone.

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“…Agricultural development can affect freshwater ecosystems through the increase in nutrient loading (as a result of fertilizer and agrochemical use), sedimentation and conversion or modification of hydric regime and riparian habitats, etc. (Sueyoshi et al 2017;Marrochi et al 2021). The mechanisms through which agriculture impacts the freshwater ecosystems can, however, show rather complex interplays and vary with local context (Siqueira et al 2015;Dala-Corte et al 2016;Molina et al 2017).…”

Section: Introductionmentioning

confidence: 99%