Distribution patterns and niche segregation of three closely related Japanese ephemerid mayflies: a re-examination of each species’ habitat from “megadata” held in the “National Census on River Environments”

Okamoto, Seiya; Tojo, Koji

doi:10.1007/s10201-021-00654-2

Cited by 12 publications

(10 citation statements)

References 34 publications

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“…When we compared the results of environmental factor measurement in the cohabitation region of both Ephemera species in this study (Table 1 ) with the environmental factors of the “National Census on River Environments” administered by the Administrative Agency of the Ministry of Land, Infrastructure, Transport and Tourism of the Japanese government (Okamoto & Tojo, 2021 ), and also with the environmental factors of our previous study within the Asahi‐gawa River System (Okamoto et al, 2022 ), the result ranges in this study were almost completely within the ranges of the data trend in previous studies (Figure S1 ).…”

Section: Resultsmentioning

confidence: 99%

“…In relationship between distribution of aquatic insect and environmental factors, generally, altitude and temperature are well known to be important factors in the distribution patterns of aquatic insects (Hildrew & Edington, 1979 ). In addition, as for Ephemera mayflies, it has been reported that the riverbed gradient is also closely related to their distribution patterns (Okamoto & Tojo, 2021 ; Watanabe, 1985 ). In addition, the relationship between the distribution of E .…”

Section: Discussionmentioning

confidence: 97%

“…In order to enable the coexistence of species, niche differentiation occurs, and as a result, habitat segregation is often observed. Yet, the targeted ephemerid species have been considered to have adapted to different environments in different river systems (Okamoto et al, 2022 ; Okamoto & Tojo, 2021 ). In this study, the habitat type used by one ephemerid species was at times found to be inhabited by the other species on a local scale.…”

Section: Discussionmentioning

confidence: 99%

“…As the target group in this study, we focused on an Ephemera mayfly group, whose distribution characteristics within the Japanese Archipelago have already been investigated in detail and for which the tendency for fine‐scale niche differentiation within specific river systems has been reported (Okamoto et al, 2022 ; Okamoto & Tojo, 2021 ). Regarding the longitudinal distributions of Ephemera mayflies, environmental factors have been suggested to have an essential role to play in their distribution and densities, based on the results of our own previous studies (Okamoto et al, 2022 ; Okamoto & Tojo, 2021 ). In particular, we focused on Ephemera japonica and Ephemera strigata , for which there is detailed information on reproductive seasons and emergence patterns.…”

Section: Introductionmentioning

confidence: 99%

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Seasonal modifications of longitudinal distribution patterns within a stream: Interspecific interactions in the niche overlap zones of two Ephemera mayflies

Okamoto

Takenaka

Tojo

2022

Ecology and Evolution

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Niche differentiation between closely related species leads to differentiation of their habitats. Segregation based on slight differences in environmental factors, that is niche differentiation on the microhabitat scale, allows more species to inhabit a certain geographic space. Therefore, such fine scale niche differentiation is an important factor in the support of species diversity. In addition, niche differentiation on the microhabitat scale and/or the differentiation of breeding seasons can be considered typical mechanisms that facilitate multispecies’ co‐existence. In this study, sister species (Commonly, Ephemera japonica inhabit at upstream region and Ephemera strigata inhabit at middle stream region), which often coexist in the upper to middle reaches of river systems of the Japanese Islands, were targeted and the following aspects were investigated. First, differences in habitat preference and interspecific differences in flow distribution patterns on a geographically fine scale were tracked in detail. Subsequently, the temporal transitions of their distribution patterns were investigated in detail and seasonal changes were investigated. Finally, we thoroughly investigated the disappearance of nymphs of each species from the river due to emergence affected the distribution of each species (by conducting daily emergence surveys). Combining results of these multiple studies also suggested that there may be spatiotemporal interspecial interaction between these two species within/around their overlapping regions. Traditionally, the longitudinal distribution pattern of these two Ephemera mayflies has been thought to be established based on a difference in habitat preferences, but this study revealed that the interspecific interaction between the two species also plays an important role. This study provides new insights into species diversity and distribution pattern formation in river‐dwelling species.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seasonal modifications of longitudinal distribution patterns within a stream: Interspecific interactions in the niche overlap zones of two Ephemera mayflies

Okamoto

Takenaka

Tojo

2022

Ecology and Evolution

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“…The distribution range of a species is influenced by the particular characteristics of each habitat's environment and/or the connectivity among habitats (Arbogast & Kenagy, 2001;Emms et al, 2020;Múrria & Hughes, 2008;Okamoto & Tojo, 2021). Therefore, it is possible that taxa having similar distribution areas may have experienced a similar evolutionary history.…”

Section: Ta B L E 2 Genetic Distancesmentioning

confidence: 99%

Phylogeography of the northernmost distributed Anisocentropus caddisflies and their comparative genetic structures based on habitat preferences

Takenaka

Shibata

Ito³

et al. 2021

Ecology and Evolution

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Environmental DNA metabarcoding on aquatic insects: Comparing the primer sets of MtInsects‐16S based on the mtDNA 16S and general marker based on the mtDNA COI region

Takenaka,

Hasebe,

Yano

et al. 2024

Environmental DNA

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Long‐term biodiversity monitoring is necessary for conservation and management. In such circumstances, environmental DNA (eDNA) surveys can enable easy and effective biomonitoring of aquatic insects. However, previous studies of aquatic insects based on the mtDNA COI region have revealed incomplete taxonomic coverage, and frequent amplification of nontarget taxa (e.g., algae and diatoms). Additionally, it has been indicated that there are few reference sequences registered in databases for metabarcoding analysis of insects. Therefore, we developed a new primer set, MtInsects‐16S, for eDNA analyses of insects based on the mtDNA 16S rRNA region in a previous study. To address the insufficient database records of insect DNA sequences, we also constructed a comprehensive reference database of aquatic insects that occur in Kanagawa Prefecture, Japan. We conducted eDNA analyses at six sites in the two river systems (the Sagami‐gawa River and Sakawa‐gawa River systems), with three replicates per site, based on both the mtDNA COI and the 16S rRNA regions. These results were compared physical capture surveys at the same sites to examine the detection capability of eDNA for Insecta with using a well‐established database. Among the list of species which were collected by physical capture surveys, 74.9% were detected by MtInsects‐16S, whereas 40.1% were detected by the primer set of the mtDNA COI region, and also 80.0% were detected by the both primer sets. This study demonstrated that the application of eDNA analyses using the MtInsects‐16S primer set can be conducted with accuracy and reliability, provided that the reference DNA database is improved. The MtInsects‐16S region can be considered indispensable in eDNA analysis for aquatic insects.

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Distribution patterns and niche segregation of three closely related Japanese ephemerid mayflies: a re-examination of each species’ habitat from “megadata” held in the “National Census on River Environments”

Cited by 12 publications

References 34 publications

Seasonal modifications of longitudinal distribution patterns within a stream: Interspecific interactions in the niche overlap zones of two Ephemera mayflies

Seasonal modifications of longitudinal distribution patterns within a stream: Interspecific interactions in the niche overlap zones of two Ephemera mayflies

Phylogeography of the northernmost distributed Anisocentropus caddisflies and their comparative genetic structures based on habitat preferences

Environmental DNA metabarcoding on aquatic insects: Comparing the primer sets of MtInsects‐16S based on the mtDNA 16S and general marker based on the mtDNA COI region

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