Fish Community Characteristics Research Articles

Fish Community Characteristics and River Health Assessment of Gayasan National Par

Fish Community Characteristics and River Health Assessment of Gayasan National Par

Assessment of the Characteristics of Demersal Fish Communities Using Species- and Trait-Based Approaches in the Coastal Habitats Along Rongcheng Bay, Shandong Peninsula, China

Assessment of the Characteristics of Demersal Fish Communities Using Species- and Trait-Based Approaches in the Coastal Habitats Along Rongcheng Bay, Shandong Peninsula, China

Assessing the response of marine fish communities to climate change and fishing.

Globally, marine fish communities are being altered by climate change and human disturbances. We examined data on global marine fish communities to assess changes in community-weighted mean temperature affinity (i.e., mean temperatures within geographic ranges), maximum length, and trophic levels, which, respectively, represent the physiological, morphological, and trophic characteristics of marine fish communities. Then, we explored the influence of climate change and fishing on these characteristics because of their long-term role in shaping fish communities, especially their interactive effects. We employed spatial linear mixed models to investigate their impacts on community-weighted mean trait values and on abundance of different fish lengths and trophic groups. Globally, we observed an initial increasing trend in the temperature affinity of marine fish communities, whereas the weighted mean length and trophic levels of fish communities showed a declining trend. However, these shift trends were not significant, likely due to the large variation in midlatitude communities. Fishing pressure increased fish communities' temperature affinity in regions experiencing climate warming. Furthermore, climate warming was associated with an increase in weighted mean length and trophic levels of fish communities. Low climate baseline temperature appeared to mitigate the effect of climate warming on temperature affinity and trophic levels. The effect of climate warming on the relative abundance of different trophic classes and size classes both exhibited a nonlinear pattern. The small and relatively large fish species may benefit from climate warming, whereas the medium and largest size groups may be disadvantaged. Our results highlight the urgency of establishing stepping-stone marine protected areas to facilitate the migration of fishes to habitats in a warming ocean. Moreover, reducing human disturbance is crucial to mitigate rapid tropicalization, particularly in vulnerable temperate regions.

Application of environmental DNA metabarcoding to identify fish community characteristics in subtropical river systems

AbstractFish are vital in river ecosystems; however, traditional investigations of fish usually cause ecological damage. Extracting DNA from aquatic environments and identifying DNA sequences offer an alternative, noninvasive approach for detecting fish species. In this study, the effects of environmental DNA (eDNA), coupled with PCR and next‐generation sequencing, and electrofishing for identifying fish community composition and diversity were compared. In three subtropical rivers of southern China, fish specimens and eDNA in water were collected along the longitudinal (upstream–downstream) gradient of the rivers. Both fish population parameters, including species abundance and biomass, and eDNA OTU richness grouped 38 sampling sites into eight spatial zones with significant differences in local fish community composition. Compared with order‐/family‐level grouping, genus‐/species‐level grouping could more accurately reveal the differences between upstream zones I−III, midstream zones IV−V, and downstream zones VI–VIII. From the headwaters to the estuary, two environmental gradients significantly influenced the longitudinal distribution of the fish species, including the first gradient composed of habitat and physical water parameters and the second gradient composed of chemical water parameters. The high regression coefficient of alpha diversity between eDNA and electrofishing methods as well as the accurate identification of dominant, alien, and biomarker species in each spatial zone indicated that eDNA could characterize fish community attributes at a level similar to that of traditional approaches. Overall, our results demonstrated that eDNA metabarcoding can be used as an effective tool for revealing fish composition and diversity, which is important for using the eDNA technique in aquatic field monitoring.

Fish Community Characteristics and the Effects of Water Quality on River Health in the Anyang Stream, Korea<sup>1a</sup>

Fish Community Characteristics and the Effects of Water Quality on River Health in the Anyang Stream, Korea<sup>1a</sup>

Long-term trends in functional diversity of exploited marine fish in the Azores’ archipelago: past and present

IntroductionEffective fisheries management requires monitoring and quantifying changes in exploited fish communities. Concerns about global fisheries sustainability have led to innovative approaches. Functional diversity, rooted in ecological theory, offers valuable insights into fishery activities and ecosystem processes. A trait-based approach was used to investigate the functional diversity of landed fish species in the Azores archipelago from 1980 to 2021.MethodsLandings data of exploited Actinopterygii and Elasmobranchii were provided by the Azores Fisheries Auction Services (LOTAÇOR/OKEANOS-UAc Fisheries Database). A trait matrix was built, incorporating 12 functional traits assigned to each species, capturing their importance in marine ecological processes. The Quickhull algorithm for convex hull was employed to calculate the volume occupied by the species in the four-dimensional functional space. Functional diversity (FD) was measured using three indices: functional richness (FRic), functional evenness (FEve), and functional divergence (FDiv). Trends in FD indices over the past 42 years were visualized using Generalized Additive Models (GAM) with interaction terms.Results and discussionGAM analysis revealed significant variations in the functional space and FD metrics over time. FRic exhibited peaks in the 1980s and 2010s, declining in the 1990s and from the 2010s onwards, indicating diversification in target species. The recent decrease in FRic can be attributed to the absence of catches of species with unique traits. The distribution of landings and trait combinations showed higher regularity in the functional space during the 1980s and 1990s (high FEve). Actinopterygii species targeted in the 1980s and 1990s had lower trait divergence (low FDiv) compared to those targeted from the 2000s onwards (high FDiv). Variability in FD can be linked to changes in fishing practices, species availability, market demand, environmental factors, and local regulations. This study underscores the importance of considering FD metrics alongside species richness and abundance when assessing the potential effects of fisheries on marine ecosystems and sustainable use of fishery resources.

Lake depth alters the trajectory of ontogenetic niche shifts in Eurasian perch (Perca fluviatilis) in small lakes

AbstractThe trophic niche of aquatic generalist predators is influenced by ontogeny, habitat characteristics, availability and type of prey, and competitive interactions. Many interrelated lake characteristics influence the availability of prey and may thereby impact foraging niches and the trajectory of ontogenetic niche shifts. Our work uses Eurasian perch (Perca fluviatilis) as a model species to examine the correlation of multiple lake and fish community characteristics with the size‐dependency of perch populations' realised trophic niche. We used carbon and nitrogen stable isotopes to correlate the changes in perch trophic position across a gradient of total lengths in seven gravel pit lakes that differed in lake morphology, habitat heterogeneity, productivity, structural complexity, and fish community composition. Perch populations in lakes with more shallow‐water habitat reached a higher trophic position at smaller sizes than perch in deeper lakes. However, the changes in trophic position with increasing size were less pronounced compared to perch from deeper lakes. Large individuals from the latter perch populations ultimately achieved higher mean trophic positions compared to fish from shallow lakes. Perch in lakes with more shallow‐water habitat may, therefore, achieve lower rates of piscivory because of higher relative availability of macroinvertebrates or greater competition with zooplanktivores. Our results suggest that large, piscivorous perch are more likely to develop in deeper lakes, and that these changes in perch trophic position across ontogeny are more strongly related to the depth of lakes than to the type of structured habitat in the littoral zone.

The Effect of Short-Term Upwelling Events on Fish Assemblages at the South-Eastern Coast of the Baltic Sea

Multiple stressors, such as overfishing, pollution, climate change, biological invasions etc., are affecting fish communities, and thus can have versatile effects on marine ecosystems and socio-economic activities as well. Understanding the changes in the fish community structure is ecologically and economically important, yet a very complex issue, requiring comprehensive analysis of multiple factors. The role of regional oceanographic variability, namely, coastal upwelling, is often neglected when it comes to the analysis of fish assemblages. In this perspective, we were aiming, for the first time in the Baltic Sea, to assess the upwelling influence on fish communities and fish community-based ecological indices used under Marine Strategy Framework Directive. The study covered a long-term period (2000–2019) for upwelling identified by satellite data analysis and fish gillnet surveys, performed in three distinct locations in the coastal waters of the SE Baltic Sea. Overall, our study revealed that temporal dynamics of fish abundance and community composition were associated with the presence of coastal upwelling. The study outcomes suggest that the fish community was more diverse and a higher number of some fish species was observed before upwelling. During upwelling, there was more evident dominance of 1–2 main marine fish species. Through the changes in fish abundance and species composition upwelling was also responsible for the changes in fish community structure-based indices for marine environment status, i.e., in the majority of the cases a decrease in Trophic, Piscivorous Fish, and Diversity indices were observed. Our study demonstrates that upwelling can affect both, the quantitative and qualitative characteristics of coastal fish communities, therefore, it is important to consider this when predicting shifts in the distribution of fish stocks or assessing environmental status indicators, especially under changing climate. We believe that our approach adds novel information to the study of coastal ecosystems of the Baltic Sea and is important for better management of socio-economic activities in the coastal zone.

계룡산국립공원의 어류군집 특성 및 하천건강성 평가

This study investigated the characteristics of fish communities and river health in the Gyeryeongsan National Park, Korea from May to September 2021. The survey collected 26 species belonging to nine families from 22 survey stations. The dominant and subdominant species were Zacco platypus(26.4%) and Rhynchocypris oxycephalus(26.1%), respectively. The next most abundant species were Zacco koreanus(21.1%), Squalidus gracilis majimae(11.0%), Pungtungia herzi(3.4%), Iksookimia koreensis(2.6%) and Rhinogobius brunneus (2.5%). Among the fish species collected, 12(46.2%) were Korea endemic species, including Rhodeus uyekii, Acheilognathus koreensis, Squalidus gracilis majimae, Microphysogobio yaluensis, Zacco koreanus, Iksookimia koreensis, Pseudobagrus koreanus, Silurus microdorsalis, Liobagrus mediadiposalis, Coreoperca herzi, Odontobutis platycephala and Odontobutis interrupta. Additionally, one exotic species(ecosystem-disturbing species Micropterus salmoides) and one landlocked species (Rhinogobius brunneus) were collected. As a result of community indices, the dominance(0.67~1.00), diversity(0.136~1.658), evenness(0.123~1.988), and richness(0.201~2.031) differed significantly by stations. Also, river health(index of biological integrity) was assessed as very good(seven stations) and good(15 stations). Gyeryeongsan National Park had a relatively well-preserved river ecosystem, but several disturbance factors(weir was installed at nine stations, river work was underway at five stations, and ecological disturbance species, M. salmoides were introduced into the Yongdong Reservoir area. The stable populations of fish in Gyeryongsan National Park require a river ecosystem protection plan and a systematic management plan for ecological disturbance species, M. salmoides.

강릉시 주수천의 어류군집 특징 및 쌀미꾸리 Lefua costata (Pisces: Namacheilidae)의 서식지 특징과 연령

강릉시 주수천의 어류군집 특징 및 쌀미꾸리의 서식지 특징과 연령을 밝히기 위해 2013년 1월부터 12월까지 조사를 실시하였다. 어류상 조사 결과 주수천은 10과 23종이 채집되었고, 우점종은 참갈겨니 Zacco koreanus (22.1%), 아우점종은 버들개 Rhynchocypris steindachneri (20.1%)였으며, 그 다음으로 민물검정망둑 Tridentiger brevispinis (10.7%), 대륙종개 Orthrias nudus (9.7%), 피라미 Zacco platypus (8.6%), 쌀미꾸리 Lefua costata (7.9%), 참종개 Iksookimia koreensis(6.0%), 가시고기 Pungitius sinensis (3.0%) 등의 순으로 우세하였다. 환경부지정 멸종위기 야생생물은 가시고기 1종이 채집되었고, 한국고유종은 참갈겨니, 참종개, 미유기 Silurusmicrodorsalis, 둑중개 Cottus koreanus 4종이, 회유성 어종은 황어 Tribolodon hakonensis, 빙어 Hypomesus nipponensis, 큰가시고기 Gasterosteus aculeatus, 연어 Oncorhynchus keta, 은어 Plecoglossus altivelis 5종이 채집되었다. 군집구조는 최상류 (St. 1), 상류 (St. 2~4), 중류 (St. 5), 하류 (St. 6)로 구분되었으며, 하천 건강성 평가는 매우좋음 (5개 지점)과 좋음 (1개 지점)으로 양호하였다. 쌀미꾸리의 주요 서식지는 하천 중·하류 (St. 5~6)의 수초 지대로 하상이 펄로 이루어졌으며 수심 40~80 cm의 유속이 느린 정수역이었다. 또한 연령 (암컷)을 전장빈도분포도로 추정한 결과, 산란이 시작되는 5월 기준 24~37 mm는 만 1년생, 38~51 mm는 만 2년생, 52~63 mm는 만 3년생, 64~77 mm는 만 4년생, 80~91mm는 만 5년생 이상으로 추정되었다. 끝으로 주수천 어류군집 특징 및 쌀미꾸리의 서식지 특징과 연령 등에 대해 논의하였다.

Long-term multiscale analysis of temporal variability in the fish community in Terminos Lagoon

The distribution of biological communities is structured at multiple spatiotemporal scales. The identification of trends and patterns in highly variable coastal ecosystems contributes to explaining the relative importance of the different scales. Herein, a temporally nested hierarchical analysis was applied to a fish community in order to determine the temporal variation in three time scales (month, season, and year) for four community attributes (species richness, abundance, biomass, and taxonomic distinctness) and two facets of species assemblages (species composition and abundance, and species composition and biomass). The analysis relied on data from four similar sets of samples belonging to a multidecadal series of Terminos Lagoon (1980, 1998, 2010, and 2016). In accordance with the hydrographic variability over time, the results revealed recurrent configurations of fish community characteristics, where the year (long term) and season (intermediate term) scales determined distribution trends and species composition patterns. In particular, trends emerged for the community attributes in the long term, whereas in the intermediate term, fluctuations were mostly recorded, which had higher values during the rainy and cold fronts seasons. Distribution patterns in both facets of species assemblages were consistent in the long and intermediate term, with the first one corresponding to an associated group of species for each year and the second one corresponding to a variable interaction with transparency and salinity according to the weather season. The present study highlights the fish adaptive response, which contributes to the ecological processes driving their temporal variability in Terminos Lagoon and is associated with hydrographic variability and estuarine condition shifts.

External fishing effort regulates positive effects of no-take marine protected areas

Marine protected areas (MPAs) have been established across the globe to mitigate the effects of multiple stressors on marine communities. In many locations, MPAs have generated positive effects on fish communities, but the impacts of fishing pressure—the primary stressor MPAs seek to manage—have not been well investigated. We examined changes in fish biomass inside and outside of no-take MPAs over 14 years in central California, USA. Using data from the community-based science program, the California Collaborative Fisheries Research Program, we tested which environmental and human-induced stressors most influence the strength of MPA responses. While temperature and productivity were included in the best fit model, we found that fine-scale fishing effort data, following reserve implementation, best explained the spatial variation in fish community responses to MPAs. Specifically, differences in fish biomass between MPAs and sites open to fishing were larger for reserves near heavily fished locations and these areas exhibited the highest rate of change in fish biomass, indicating strong positive effects of the MPA on the most heavily exploited fish communities. As MPAs continue to be used as a prominent conservation strategy in coastal systems, managers should consider both the suite of human-induced (socio-ecological interactions) and environmental conditions that may alter MPA success as well as establish long-term monitoring programs to fully assess the functionality of marine reserves into the future.

Changes in trophic structure of an exploited fish community at the centennial scale are linked to fisheries and climate forces

Understanding how marine food webs are affected by anthropogenic stressors is an important steppingstone toward the improved management of natural resources. Stable isotope analysis of historical and modern samples spanning a century indicated that the niche width of an exploited fish community increased after the expansion of New Zealand fisheries. Since the 2000s most species increased their reliance on food webs supported by pelagic production, compared to coastal production supported by macroalgae, and shifted to a higher trophic level. Overall changes were coincident with ocean warming, climate oscillations, prey abundance and fishing intensity, but their effects were specific to each fish assemblage analyzed. Data derived from historical samples revealed how anthropogenic stressors can drive long-term shifts in the trophic structure of an exploited fish community.

Spatio-temporal characteristics of demersal fish community in the Chukchi and northern Bering Seas: significant distributional records and interannual variations in species composition and biodiversity

Spatio-temporal characteristics of demersal fish community in the Chukchi and northern Bering Seas: significant distributional records and interannual variations in species composition and biodiversity

城镇化背景下深圳典型流域鱼类群落特征及驱动因子研究

PDF HTML阅读 XML下载 导出引用 引用提醒 城镇化背景下深圳典型流域鱼类群落特征及驱动因子 DOI: 10.5846/stxb202106071510 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 深圳市主要河流水生态监测与评价项目（2019-07-233） Characteristics of fish communities and driving factors under urbanization in typical river basins in Shenzhen City, China Author: Affiliation: Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:理解城镇的快速发展对河流鱼类群落结构的影响，是城镇河流科学管理和生物多样性保护的关键基础。研究于2019年丰水期（8月）和枯水期（11月），选取我国城镇化典型城市-深圳域内两个处于不同城镇化程度的代表性流域，应用多重统计方法比较分析了流域间鱼类群落结构的差异，并探讨了驱动鱼类群落变异的关键环境要素。结果发现，城镇化程度高的观澜河流域其鱼类种类组成、优势类群、生物多样性指数与城镇化程度低的坪山河流域有明显差别。具体表现为：城镇化程度高的流域土著敏感种类如异鱲、吸鳅等几近消失，优势类群为外来入侵耐受种类，其物种多样性显著低于城镇化程度低的流域（P<0.05）。同时，外来鱼类在城镇河段其数量占比平均达92.5%，广泛分布于深圳城镇河流中。在环境因素方面，城镇化程度高的观澜河流域水体理化指标总氮、总磷、氨氮、化学需氧量、生化需氧量、高锰酸盐指数均显著性高于城镇化程度低的坪山河流域（P<0.05）。基于Bray-Curtis距离的冗余分析显示：城镇用地占比和总氮是影响观澜河和坪山河流域鱼类群落差异的主要因素。城镇化进程中河流生境的改变已影响到土著鱼类的生物多样性。因此，推动以恢复土著鱼类生物多样性的河流生态治理与保护是今后水生态目标管理的重要方向。 Abstract:Understanding impacts of rapid urbanization on structure of river fish communities is the key basis for scientific management and biodiversity conservation for urban rivers. We selected two representative basins with different degrees of urbanization in the typical urbanized city, Shenzhen City, China. Field sampling was conducted in both wet (August) and dry (November) seasons in 2019. We compared and analyzed the differences of fish communities between the two basins using the multiple statistical methods, and explored the key environmental factors driving the variations of fish communities. Results showed that species composition, dominant species, and biodiversity of fish in the highly urbanized Guanlan River Basin were significantly different from those in the less urbanized Pingshan River Basin. In particular, the sensitively indigenous fish species such as Schistura fasciolatus and Parazacco spilurus disappeared while the invasive tolerant species were the dominant species in the highly urbanized basin. Fish biodiversity was significantly lower in the highly urbanized basin than the less urbanized basin (P<0.05). Meanwhile, non-native fish species had spread rapidly in urbanized rivers of Shenzhen City, which accounted for more than an average of 92.5% in the urbanized river sites. For environmental factors, total nitrogen, total phosphorus, ammonia, chemical oxygen demand, biochemical oxygen demand, and permanganate index in the highly urbanized Guanlan River Basin were significantly higher than those of the less urbanized Pingshan River Basin (P<0.05). Redundancy analysis based on the Bray-Curtis distance showed that the proportion of urban land and total nitrogen were the main factors affected the difference of fish communities in the Guanlan and Pingshan River Basins. Changes of river habitat from urbanization reduced biodiversity of the native fishes. Thus, restoring native fish biodiversity in river ecological management and protection is the important direction of aquatic objective-based management. 参考文献 相似文献 引证文献

Decadal changes in exploited fish communities and their relationship with temperature, fisheries exploitation, and ecological traits in New Zealand waters

ABSTRACT Composition and length-frequency are important attributes considered in the management of fish communities and can be affected by both exploitation and environmental forces. Vulnerability to these effects varies among species depending on environmental tolerance, ecological traits, and life-history strategies. In the present study, data from scientific bottom trawl surveys conducted between 1991 and 2018 were analysed to identify long-term changes in community structure and length-frequency of demersal fish species of the east coast of the South Island, New Zealand. Analysis of variance, hierarchical clustering analysis and multidimensional scaling relationships demonstrated that community composition has changed significantly over the last three decades, with a tendency towards greater spatial overlap among species in the most recent periods. Changes in depth distribution were identified but were mainly correlated with shifts in relative biomass. Total catch rate (kg km−2) of the whole community has increased significantly over time, while the average trophic level decreased, primarily explained by an increase in relative biomass of intermediate trophic level species. Fishing activity was significantly related to the variation in length-frequency of species at intermediate trophic levels, confirming that the impacts of fisheries are heterogeneous throughout the community, providing vital information to support multi-species management of fishery resources.

Characteristics of Fish Community and the Effects of Water Quality on River Health in Sincheon, Imjin River, Korea

Characteristics of Fish Community and the Effects of Water Quality on River Health in Sincheon, Imjin River, Korea

Fish Community Characteristics and River Health Assessment of Sobaeksan National Park

Fish Community Characteristics and River Health Assessment of Sobaeksan National Park

Characteristics of Fish Communities in Namyang Lake and its Tributaries in the Estuary of Han River Watershed, South Korea

Characteristics of Fish Communities in Namyang Lake and its Tributaries in the Estuary of Han River Watershed, South Korea

Characteristics of Fish Communities and Length-weight Relationships of Dominant Species (&lt;i&gt;Zacco platypus&lt;/i&gt;) in Seomjin River

Characteristics of Fish Communities and Length-weight Relationships of Dominant Species (&lt;i&gt;Zacco platypus&lt;/i&gt;) in Seomjin River