Seiji Miyazono's research while affiliated with Yamaguchi University and other places

Publications (31)

Article
Understandings of fish spawning are important for the effective riverine ecosystem and fisheries resources management. Application of environmental DNA (eDNA) analysis would allow fish spawning evaluation at a high temporal and spatial resolution due to its less-labor intensive property, compared to the conventional collection methods. However, the...
Preprint
Quantitative assessment of biodiversity provides invaluable information for ecosystem conservation and the sustainable use of biological resources. Environmental DNA (eDNA) metabarcoding has been used as a powerful tool for identifying community composition, but it does not necessarily provide quantitative information due to several methodological...
Article
Invasive macrophytes can have a variety of effects on aquatic ecosystems. The early detection and abundance estimation of an invasive species is important to effectively control it and minimize the ecosystem impacts. It is imperative to develop more efficient sampling methods for the abundance quantification of aquatic plants in large riverine syst...
Preprint
Full-text available
The global outbreak of the SARS-CoV-2 pandemic has increased the focus of Wastewater-based epidemiology (WBE) studies as a tool for understanding the epidemic and risk management. A highly sensitive and rapid method for the virus concentration from wastewater is needed to obtain the accurate information for early detection of SARS-CoV-2 outbreak an...
Article
Full-text available
The Ayu Plecoglossus altivelis altivelis is an amphidromous fish that is not only the most important commercial fishery species in Japanese rivers but also has a high economic value in recreational fishing. However, the degradation of its spawning grounds has caused a decrease in its abundance. In this study, we used environmental DNA (eDNA) to mon...
Article
Full-text available
Alteration of flow regimes by anthropogenic activities is one of the primary environmental problems in riverine systems. Understanding how hydrologic conditions can affect ontogenetic habitat shifts of imperiled fishes is important in order to develop conservation and management strategies for each life-history stage. We examined relationships betw...
Article
Estimating the presence and abundance of non-native species in the early stage of invasion is important to prevent further spread of non-native species in aquatic systems. Environmental DNA (eDNA) methods have been applied for aquatic plants; however, it is still questionable on the accuracy of the eDNA methods for the detection and abundance estim...
Article
The objectives of this study are to (1) compare the results of fish environmental DNA(eDNA) metabarcoding from glass-fiber filters with different pore sizes and (2) compare these results with the results of fish collection surveys. We collected eDNA water samples and fishes in five rivers. We filtered the sampled water through the filters with thre...
Article
In this study, we examined the spatial fish distribution patterns in the river segment from the Haji Dam to the three tributary junction section (~40 km) in the Gonokawa River using environmental DNA metabarcoding. We also examined the relationships between the fish assemblage patterns and environmental factors such as hydraulic environment and inv...
Article
The overgrowth of Egeria densa is a major issue in the Gonokawa River. It is necessary to identify the environmental factors negatively affecting E. densa in the river in order to develop the management strategies for eradicating the nonnative aquatic plant. In this study, we quantified the coverage of E. densa with UAV and analyzed the relationshi...
Article
Full-text available
Predicting how stream fishes may respond to habitat restoration efforts is difficult due, in part, to an incomplete understanding of how basic biological parameters such as growth and ontogenetic habitat shifts interact with flow regime and riverscape ecology. We assessed age-specific Guadalupe Bass Micropterus treculii habitat associations at thre...
Article
We had the largest flood flow in the observation history of Kawamoto Station in Gonokawa River in Hiroshima prefecture in July 2018. This study surveyed the cover degree of nonnative aquatic weed (Egeria densa) in the river segment (~38km) from Haji Dam to the three tributary junction section in Gonokawa River before and after the flood event, usin...
Article
Full-text available
1. We examined riverine desert fish assemblages in the Chihuahuan Desert, U.S.A. at multiple spatial scales of similarity to assess long-term changes to assemblage distinctiveness, identify individual species responsible for changes, and determine the importance of geographic context and species resolution in interpreting patterns of change. 2. We...
Article
Full-text available
Evaluating the precision of age estimates generated by different readers and different calcified structures is an important part of generating reliable estimations of growth, recruitment, and mortality for fish populations. Understanding the potential loss of precision associated with using structures harvested without sacrificing individuals, such...
Article
Full-text available
We investigated how stream fragmentation affects local fish species persistence and extinction from three Rio Grande systems (Texas, USA) stream reaches with different levels of natural fragmentation. We examined species–volume (SV) relationships of fish assemblages in 42 pools across the watersheds and predicted greater fragmentation would corresp...
Conference Paper
Full-text available
Tornillo Creek, a tributary of the Rio Grande in Texas, USA, historically is an important nursery and spawning habitat for certain native fish taxa in the Rio Grande system. We examined long-term (1967–1970 vs. 2009–2011) seasonal fish assemblage changes and contemporary assemblage-environmental associations in Tornillo Creek in order to understand...
Article
Full-text available
Habitat fragmentation is one of the major causes of local and regional species extinctions in freshwater ecosystems. To predict future trends in community composition, and the potential sequence of extinctions due to fragmentation of the river continuum, it is important to understand how habitat size and isolation affect the dynamics of species imm...
Article
Full-text available
Resumen El río Bravo y sus tributarios en la región Trans-Pecos de Texas han sido afectados por una variedad de actividades antropogénicas tales como la disecación y la introducción de especies no nativas. Estas manipulaciones ambientales han afectado negativamente a los peces nativos, llevándolos a la extirpación y a la disminución poblacional a t...
Conference Paper
Background/Question/Methods Desert river systems are characterized by highly fluctuating environmental conditions such as periodic droughts and intense desert rains. These changing environmental conditions in desert river systems can cause difficulties in determining the effects of local and regional factors on aquatic communities. In this study,...
Conference Paper
Background/Question/Methods Habitat connectivity is a vital and dynamic element for persistence and maintenance of fish communities in desert river systems. The Rio Grande and its tributaries in the Trans-Pecos region of Texas have been impacted by a variety of anthropogenic activities including dewatering and the introduction of non-native speci...
Article
Miyazono S, Aycock JN, Miranda LE, Tietjen TE. Assemblage patterns of fish functional groups relative to habitat connectivity and conditions in floodplain lakes. Ecology of Freshwater Fish 2010: 19: 578–585. © 2010 John Wiley & Sons A/SAbstract –  We evaluated the influences of habitat connectivity and local environmental factors on the distributio...
Article
Reservoirs have traditionally been regarded as spatially independent entities rather than as longitudinal segments of a river system that are connected upstream and downstream to the river and other reservoirs. This view has frustrated advancement in reservoir science by impeding adequate organization of available information and by hindering inter...

Citations

... On the basis of these findings, attempts have been made to estimate the presence or absence of spawning activity and/or their scale by observing a spike in eDNA concentration or a change in the ratio before and after the expected spawning time. 13,14,20,21 It has been suggested that both approaches are useful and contribute to efficient and noninvasive detection of spawning; nevertheless, no studies have been conducted on the characteristics and dynamics of sperm-derived eDNA, which is key in both approaches. ...
... It is concerned that E. densa could negatively affect the growth of native aquatic algae through resource and habitat competitions, leading to the decrease in Ayu Plecoglossus altivelis altivelis that feed the algae in the river . Egeria densa ubiquitously occurred in the mainstem (Kodama et al. 2019) and certain tributaries (field observations in 2019). Egeria densa in the tributaries can be source populations to E. densa in the mainstem and estimating the relative abundance of E. densa in the tributaries is important for refining the management strategies of E. densa in the region (e.g., prioritizing extermination tributary areas). ...
... 10 For the downstream rivers, outflow discharges from a dam and/or its fluctuation should not be too small to suppress bloom of nuisance benthic algae and vegetation. 11,12 This is a requirement of discharge called environmental flows and has been a key concept in operating dam and reservoir systems in the modern world. 13 By contrast, too large outflow should be avoided for flood preventions. ...
... We validated BEM using empirical growth of a Guadalupe bass population in the South Llano River. We estimated agespecific growth using back-calculated length-at-age measurements of scales taken from fish spawned between 2005(Groeschel-Taylor et al., 2019. Lengths-at-age were converted to masses-at-age using von Bertalanffy equations of Guadalupe bass (Groeschel-Taylor et al., 2019). ...
... stonerollers, Gelwick & Matthews, 1997;Reisinger et al., 2011), or are good water-quality indicators (e.g. bigeye shiner, Eley et al., 1981 andcreek chub, Nagrodski et al., 2013) were negatively associated with landscape disturbance and stream- Similarly, Taylor et al. (2019) reported changes in the fish assemblage in reaches of the Pecos River subbasin and homogenization in the Rio Grande River subbasin following reduction in flow magnitude and water quality. The homogenization of fish assemblages due to landscape development has been documented globally in both freshwater (Scott & Helfman, 2001;Villéger et al., 2014) and marine systems (Magurran et al., 2015;Richardson et al., 2018). ...
... However, accurate estimates of age and growth are imperative in understanding the reasons behind differences in PSD values. Comparable estimates of growth may not currently be available for Blue Suckers because fish have MANAGEMENT BRIEF 203 traditionally been aged using pectoral fin rays (Bednarski and Scarnecchia 2006;LaBay et al. 2011;Acre et al. 2017), but recent studies comparing the use of fin rays versus otoliths to age Blue Suckers have demonstrated that ages that are assigned using otoliths tend to be higher in larger individuals (Carlson et al. 2021;Radford et al. 2021). Although ages that are assigned by using otoliths and fin rays have not been validated for Blue Suckers, validations that have been performed for other species have demonstrated that otoliths provide more accurate age estimates (Buckmeier et al. 2002;Buckmeier and Howells 2003;Lackmann et al. 2019). ...
... β-diversity is affected by compositional heterogeneity due to different species identities within and among sites (turnover) and ordered species loss where the species present in sites with poor species richness are proper subsets of the species in sites that have higher species richness (nestedness) (Anderson et al. 2011;Baselga, 2010;Legendre, 2014). In intermittent rivers, compositional heterogeneity and differences in species richness within and among aquatic habitats are higher with increasing fragmentation and environmental harshness (Bogan et al. 2013;Miyazono & Taylor, 2015;Ruhí et al. 2015). For example, fish and invertebrate assemblage composition may show significant turnover during the last stages of drought, and spatial heterogeneity often declines during and immediately after flooding (Buendia et al. 2014;Fernandes et al. 2009). ...
... A prevailing problem, however, is that some species of native fauna that may be needed for effective implementation of the biomic approach have been extirpated from many rivers, which is particularly the case in dryland rivers (Miyazono et al., 2015). Reintroduction has become a commonly used tool in restoration ecology for returning native species to habitats from which they were extirpated and likely will have an increasing role in the biomic approach to river restoration (Johnson et al., 2020). ...
... The study area (Figure 1) has been described in detail from previous studies of the Rio Grande and Pecos River sub-basins in the Trans-Pecos region of Texas (Cheek & Taylor, 2015;Miyazono & Taylor, 2013;. To summarise, the Rio Grande and the Pecos River (its largest tributary) drain part of Colorado, most of the state of New Mexico, and the entire Trans-Pecos illustrated the importance of scale-dependent effects and geographical context on patterns of assemblage distinctiveness, especially with regard to species invasion, species loss and relative abundance shifts. ...
... Historical change among stream fish assemblages has received considerable attention (see symposium by Rinne, Hughes, & Calamusso, 2005). A commonality among approaches is the combination of historical and contemporary collections, usually made by different investigators (Miyazono & Taylor, 2015;Perkin & Bonner, 2011). ...