Effects of Habitat Disturbance on Fish Community Structure in a Gravel-Bed Stream, Korea

Abstract

ABSTRACT:Fish assemblages play an integral role in stream ecosystem and are influenced by stream environmental conditions and habitat disturbances. Fish community structures and habitat parameters of U.S. EPA rapid bio-assessment protocol were surveyed to investigate the effect of stream environment and habitat disturbance on fish communities at 13 study sites in the Gapyeong Stream, a typical gravel-bed stream. Principal component analysis (PCA) based on data from habitat assessment at each study site indicated that the study sites were differentiated by habitat parameters such as embeddedness, velocity/depth regime and sediment deposition, which were related with bed slope. A total of 46 species belonging to 12 families were collected in the Gapyeong Stream. A dominant species was Zacco koreanus, subdominant species was Z. platypus. Hierarchical cluster analysis based on species abundance classified fish communities into the three main groups along the stream longitudinal change. Non-metric multidimensional scaling (NMDS) portrayed that fish community structures were related to major habitat parameters, i.e., epifaunal substrate/available cover, embeddedness, velocity/depth regime, sediment deposition, channel alternation and frequency of riffles. These results suggested that fish community structures were primary affected by the longitudinal environmental changes, and those were modified by habitat disturbance in the Gapyeong Stream, a gravel-bed stream.

Spatiotemporal Variation Analyses of Water Quality, Fish Ecological Guilds, and the Longitudinal Connectivity in Musim Stream

“…5(b)). 이는 상기 지점 의 경우 모두 상류역의 특성을 보이는 지점으로 버들치가 우 점하기 때문인 것으로 사료되며 20) , 최하류 지점(S44)의 경우 내성종(TS)와의 유사도가 높은 것으로 나타났는데, 이는 누치 (Hemibarbus labeo), 참붕어(Pseudorasbora parva)등 내성종 이 우점하기 때문인 것으로 사료된다. 성이 높은 S1~S5지점은 따로 구분하여 추가적으로 분석하여 보았을 때, 충식종의 비율이 88.1%로 매우 높은 값을 보였다 (Fig.…”

Impacts of an extreme flood event on the riparian vegetation of a monsoonal cobble‐bed stream in southern Korea: A multiscale fluvial biogeomorphic framework

“…This is because higher magnitude disturbances can tip an ecosystem over a threshold, causing it to enter an alternative stable state (Odion, Moritz, & DellaSala, 2010;Parsons, McLoughlin, Rountree, & Rogers, 2006;Robinson & Uehlinger, 2008), whereas weaker events, although being more frequent, may not have the magnitude to induce This study also provides unique insights into the impact of rare, extreme floods by employing two, multiscaled approaches. First, we employed a fluvial biogeomorphic framework in which various components (vegetation, hydrology, and geomorphology) are considered together in the analysis (Corenblit et al, 2007(Corenblit et al, , 2015Jerin, 2019;Kim et al, 2020;Kim & Kupfer, 2016;Tabacchi et al, 2019;Woo et al, 2019). This paper shows how these components interact and influence each other during the disturbance event.…”

Analysis of similarity among national parks in Korea: A comparison of habitat composition and species presence–absence data (Lepidoptera, aquatic insects, and higher plants)

“…Since the taxa differ depending on the type of habitat, classification of habitats is essential before surveying the biota. Accordingly, detailed habitat type classification and area determination studies were performed for 21 NPs in Korea, excluding Jeju‐do (Kim et al 2021; Korea National Park Research Institute 2019). Therefore, if the similarity of each NP is measured using the data that divides the area of each NP by habitat type, NPs with high similarity in the number of specific habitats will be grouped together and have a tendency to have numerous similarities with the distribution similarity of species.…”