scholarly journals Composition and structure of fish assemblage from Passa Cinco stream, Corumbataí river sub-basin, SP, Brazil

2012 ◽  
Vol 72 (1) ◽  
pp. 87-96
Author(s):  
AL Carmassi ◽  
G Rondineli ◽  
FC Ferreira ◽  
FMS Braga
Keyword(s):  
Species Distribution ◽  
Fish Assemblage ◽  
Altitudinal Gradient ◽  
Habitat Diversity ◽  
Important Species ◽  
Assemblage Composition ◽  
Gill Nets ◽  
Composition And Structure ◽  
Significant Difference ◽  
Richness Index

The aim of this work was to determine the composition of the fish assemblage of Passa Cinco stream and verify changes in their structure on the altitudinal gradient. Six samples were performed at five different sites in Passa Cinco stream (from the headwater, at order two, to its mouth, at order six), using an electric fishery equipment and gill nets in May, July, September and November of 2005 and January and March of 2006. The indices of Shannon's diversity, Pielou's evenness and Margalef's richness were quantified separately considering the different fishery equipment (nets versus electric fishery equipment). An ANOVA was used to compare samples collected in relation to values of abundance, diversity, evenness and richness. The representativeness of the species was summarised by their average values of abundance and weight. We captured 5082 individuals distributed into 61 species. We observed a trend of increasing diversity, richness and evenness of species from site 1 to 3, with further decrease in sites 4 and 5. The values found for habitat diversity also followed this pattern. Significant differences were found for all three indices considering the electric fishery samples. For individuals caught with nets, only the richness index showed a significant difference. Characidium aff. zebra was an important species in the headwater and transition sites and Hypostomus strigaticeps in middle-lower course sites. Despite the small extension of the Passa Cinco stream, environments structurally well defined were evidenced by the species distribution and assemblage composition along the gradient.

Studies on Community Characteristics of Actinomycetes at Lakeside of Swamping Wetland in WuLiangSuHai

2014 ◽  
Vol 955-959 ◽  
pp. 3283-3286
Author(s):  
Wei Wei Cao ◽  
Ji Zhao ◽  
Yu Qin Shao ◽  
Jia Yin Lu ◽  
Jing Yu Li
Keyword(s):  
Phragmites Australis ◽  
Diversity Index ◽  
Suaeda Salsa ◽  
Community Characteristics ◽  
Dominance Index ◽  
Composition And Structure ◽  
Significant Difference ◽  
Nitraria Tangutorum ◽  
Dominant Bacteria ◽  
Richness Index

The core of this research was to study the amount, diversity, richness, evenness and dominance of soil Actinomycetes at lakeside of swamping wetland. In this study, Amount of Actinomycetes were determined through plate counting method, which was in Phragmites australis, Suaeda salsa and Nitraria tangutorum growing soil at the upstream, midstream and downstream of Wuliangsuhai. Community structure of Actinomycetes were analyzed on the basis of it‘s diversity index (H), evenness index (J), richness index (R) and dominance index (D). The results showed that, the diversity, richness and dominance of Actinomycetes were all affected by the types of plants, and showed significant difference among them. However, there was no significant difference for evenness. What’s more, both the order of diversity and richness in different plants growing soil were: Nitraria tangutorum> Suaeda salsa >Phragmites australis. And the order of dominance was: Suaeda salsa >Phragmites australis >Nitraria tangutorum. Dominant bacteria in Phragmites australis was Flavus, accounting for 85%, dominant bacteria in Nitraria tangutorum were Albosporus and Flavus, which accounted for 54.8% and 26%, and dominant bacteria in Suaeda salsa were Albosporus,Albosporus and Flavus, accounted for 26.7%, 23.5%. As the succession from Phragmites australis swamp to Suaeda salsa Saline meadow, and then to Nitraria tangutorum desert in Wuliangsuhai, the composition and structure of Actinomycetes there are changing at the same time.

scholarly journals Fish assemblage composition and structure in a pampean stream with contrasting land uses

2018 ◽  
Vol 20 ◽  
pp. 11-22
Author(s):  
Andrea Bertora ◽  
Fabián Grosman ◽  
Pablo Sanzano ◽  
Juan José Rosso
Keyword(s):  
Fish Assemblage ◽  
Land Uses ◽  
Assemblage Composition ◽  
Composition And Structure

scholarly journals Fish assemblage composition and structure in a pampean stream with contrasting land uses.

2108 ◽  
Vol 20 ◽  
pp. 11-22
Author(s):  
Andrea Bertora ◽  
Fabián Grosman ◽  
Pablo Sanzano ◽  
Juan José Rosso
Keyword(s):  
Fish Assemblage ◽  
Land Uses ◽  
Assemblage Composition ◽  
Composition And Structure

Assemblage Patterns of Hymenoptera at Different Elevations of Gunung Datuk, Rembau

2017 ◽  
Vol 14 (2) ◽  
pp. 1 ◽  
Author(s):  
Noor Nasuha Abd Aziz ◽  
Siti Khairiyah Mohd Hatta ◽  
Idris Abd Ghani ◽  
Saiyid Jalaluddin Saiyid Shaifuddin
Keyword(s):  
Species Richness ◽  
Diversity Index ◽  
High Elevation ◽  
Significant Difference ◽  
Index Site ◽  
Evenness Index ◽  
Abundance And Diversity ◽  
Richness Index ◽  
Paired T Test ◽  
Malaise Traps

A study on abundance and diversity of Hymenoptera was conducted in Gunung Datuk, Rembau. Samplings were conducted from November 2014 to February 2015 using six Malaise traps. Three traps were placed at Site 1 at 700m height for high elevation and the remaining traps were placed at Site 2 at 200m height for low elevation. A total number of 221 Hymenopteran were collected which consist of nine families namely Ichneumonidae, Formicidae, Braconidae, Bethylidae, Evaniidae, Tiphiidae, Vespidae, Pompilidae and Apidae. In this study, 93 individuals were obtained from Site 1, comprising nine families and 43 morphospecies while 127 individuals were obtained from Site 2 with nine families and 45 morphospecies. Formicidae was the most dominant family collected from both sites with a total of 104 individuals while the least family recorded was Apidae with only one individual. Shannon’s Weiner Diversity Index (H’) showed Site 1 had the higher diversity value with H’ = 3.17 compared to Site 2 with value H’ = 3.12. For Evenness Index, Site 1 had higher value compared to Site 2 with E’ = 0.84 and E’ = 0.82 respectively. Moreover, for Margalef Richness Index, Site 1 recorded R’ = 9.24 while site two recorded R’ = 9.08 which concluded that Site 1 had higher species richness compared to Site 2. Paired t-test showed that both sites had no significant difference with p>0.05. Overall study showed that the diversity and abundance of Hymenoptera in Gunung Datuk were low since the value of H’ is less than 3.50.

scholarly journals Second floor, please: the fish fauna of floating litter banks in Amazonian streams and rivers

2013 ◽  
Vol 11 (1) ◽  
pp. 85-94 ◽  
Author(s):  
Lucelia Nobre Carvalho ◽  
Luana Fidelis ◽  
Rafael Arruda ◽  
Andre Galuch ◽  
Jansen Zuanon
Keyword(s):  
Species Richness ◽  
Fish Assemblage ◽  
Amazon Basin ◽  
Stream Water ◽  
Fish Fauna ◽  
Assemblage Composition ◽  
Plant Matter ◽  
Carnivorous Species ◽  
Ephemeral Habitat ◽  
Dead Plant

Floating litter banks are an ephemeral habitat consisting of branches, twigs, flowers, seeds, and fruits that are trapped on the stream water surface by a variety of retention mechanisms. These heterogeneous materials form a deep layer of dead plant matter that is colonized by a variety of organisms, including fish that forage on the aquatic macroinvertebrates found in this unique habitat. In this study, we aimed to characterize which fish species occupy the floating litter banks and their trophic characteristics, as well as determine if fish assemblage composition and species richness can be predicted by the size of the floating litter banks. Fish sampling was conducted in five rivers located in the Amazon basin. Of the 31 floating litter banks sampled that contained fish, 455 individuals were recorded and were distributed within 40 species, 15 families and five orders. Siluriformes were the most representative order among the samples and contained the largest number of families and species. The fish fauna sampled was mainly composed of carnivorous species that are typically found in submerged litter banks of Amazonian streams. The fish assemblage composition in the kinon can be predicted by the volume of the floating litter banks using both presence/absence and abundance data, but not its species richness. In conclusion, kinon banks harbor a rich fish assemblage that utilizes this habitat for shelter and feeding, and may function as a refuge for the fishes during the peak of the flooding season.

scholarly journals Temporal variation in fish assemblage composition on a tidal flat

2004 ◽  
Vol 52 (1) ◽  
pp. 47-58 ◽  
Author(s):  
Henry L. Spach ◽  
Rodrigo S. Godefroid ◽  
César Santos ◽  
Roberto Schwarz Jr. ◽  
Guilherme M. L. de Queiroz
Keyword(s):  
Tidal Flat ◽  
Fish Assemblage ◽  
Annual Variation ◽  
Full Moon ◽  
Temporal Change ◽  
High Tide ◽  
Great Influence ◽  
Assemblage Composition ◽  
Combined Action ◽  
Wind Intensity

Annual variation in the fish assemblage characteristics on a tidal flat was studied in coastal Paraná, in southern Brazil. Fish were collected between August 1998 and July 1999, during the diurnal high tide and diurnal and nocturnal low tide of the syzygial (full moon) and quadrature (waning moon) tides, to characterize temporal change in assemblage composition. A total of 64,265 fish in 133 species were collected. The average number of species and individuals, biomass, species richness, diversity (mass) and equitability varied significantly over time . The dissimilarity of the assemblage was greatest in August, September and October in contrast with the period from November to January, with the lowest dissimilarity. The combined action of water temperature, salinity and wind intensity had a great influence over the structure of the fish assemblage.

Cerrado to Rupestrian Grasslands: Patterns of Species Distribution and the Forces Shaping Them Along an Altitudinal Gradient

2016 ◽  
pp. 345-377 ◽  
Author(s):  
G. Wilson Fernandes ◽  
Hernani A. Almeida ◽  
Cássio A. Nunes ◽  
João Henrique A. Xavier ◽  
Neil S. Cobb ◽  
...  
Keyword(s):  
Species Distribution ◽  
Altitudinal Gradient

scholarly journals Cambodian Freshwater Fish Assemblage Structure and Distribution Patterns: Using a Large-Scale Monitoring Network to Understand the Dynamics and Management Implications of Species Clusters in a Global Biodiversity Hotspot

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2506
Author(s):  
Kakada Pin ◽  
Savat Nut ◽  
Zeb Hogan ◽  
Sudeep Chandra ◽  
Samadee Saray ◽  
...  
Keyword(s):  
Indicator Species ◽  
Fish Assemblage ◽  
Fish Assemblages ◽  
Mekong River ◽  
Biodiversity Hotspots ◽  
Fish Assemblage Structure ◽  
Assemblage Composition ◽  
Tonle Sap Lake ◽  
Tonle Sap ◽  
High Diversity

Mekong River Basin is one of the world’s fish biodiversity hotspots. Fisheries of the Cambodian Mekong are characterized by high diversity and productivity. However, few studies have focused on broad scale patterns and fish assemblage structure of this important system at a national level. Here, we describe spatial and seasonal variation in fish assemblages by analyzing one year of daily fish catch data sampled at 32 sites covering Cambodia’s main inland water bodies. We recorded 125 fish species. Four clusters were distinguished based on assemblage composition similarity, and 95 indicator species were identified to characterize each of the identified assemblage clusters. High diversity fish assemblages were associated with the upper Mekong system and Mekong/Bassac/Tonle Sap Rivers in Kandal Province and southern Tonle Sap Lake while lower diversity assemblages were observed in the Mekong River in Kratie and the northern area of the Tonle Sap Lake. We find significant variation in the assemblage composition between wet and dry seasons, indicating strong seasonal species turnover within clusters. Length–weight relationship analysis indicated a negative allometric growth among a majority of indicator species, reflecting suboptimal conditions for growth. Our study establishes contemporary structure and diversity patterns in the Lower Mekong River system of Cambodia, which can be used to map fish biodiversity hotspots and assess key indicative fish stocks’ statuses for conservation and management.

scholarly journals Presence of riparian vegetation increases biotic condition of fish assemblages in two Brazilian reservoirs

2015 ◽  
Vol 27 (3) ◽  
pp. 289-300 ◽  
Author(s):  
Fabio Cop Ferreira ◽  
Ursulla Pereira Souza ◽  
Miguel Petrere Junior2
Keyword(s):  
Fish Assemblage ◽  
Riparian Vegetation ◽  
Habitat Complexity ◽  
Fish Assemblages ◽  
Biotic Integrity ◽  
Wood Structures ◽  
Paulo State ◽  
Composition And Structure ◽  
Lakes And Reservoirs ◽  
Metric Selection

Abstract The riparian vegetation in lakes and reservoirs is source of course wood structures such as trunks and branches and is used as sheltering, spawning and foraging habitats for fishes. The reduction of these submerged structures can thus, affect the composition and structure of fish assemblages in reservoirs. Aim To evaluate the influence of riparian vegetation on the biotic condition of fish assemblage by adapting the Reservoir Fish Assemblage Index (RFAI) to two reservoirs in the Upper Paranapanema river basin, São Paulo State, Brazil. Methods The RFAI was adapted from metrics related to the functional characteristics and composition of fish assemblages through a protocol of metric selection and validation, and to its response to the presence of riparian vegetation. Results The final RFAI was composed by nine metrics, been lower in sites without riparian vegetation as consequence of the predominance of larger individuals and the percent of piscivorous and detritivorous fishes. Conclusions These results suggest that increasing shore habitat complexity in reservoirs by maintaining riparian vegetation increases fish biotic integrity.

scholarly journals Modelling Distributions of Rove Beetles in Mountainous Areas Using Remote Sensing Data

2019 ◽  
Vol 12 (1) ◽  
pp. 80 ◽  
Author(s):  
Andreas Dittrich ◽  
Stephanie Roilo ◽  
Ruth Sonnenschein ◽  
Cristiana Cerrato ◽  
Michael Ewald ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Species Distribution ◽  
Monitoring Program ◽  
Predictor Variable ◽  
Species Distributions ◽  
Additive Models ◽  
Suitable Habitat ◽  
Operating Characteristics ◽  
Important Species ◽  
Rove Beetles

Mountain ecosystems are biodiversity hotspots that are increasingly threatened by climate and land use/land cover changes. Long-term biodiversity monitoring programs provide unique insights into resulting adverse impacts on plant and animal species distribution. Species distribution models (SDMs) in combination with satellite remote sensing (SRS) data offer the opportunity to analyze shifts of species distributions in response to these changes in a spatially explicit way. Here, we predicted the presence probability of three different rove beetles in a mountainous protected area (Gran Paradiso National Park, GPNP) using environmental variables derived from Landsat and Aster Global Digital Elevation Model data and an ensemble modelling approach based on five different model algorithms (maximum entropy, random forest, generalized boosting models, generalized additive models, and generalized linear models). The objectives of the study were (1) to evaluate the potential of SRS data for predicting the presence of species dependent on local-scale environmental parameters at two different time periods, (2) to analyze shifts in species distributions between the years, and (3) to identify the most important species-specific SRS predictor variables. All ensemble models showed area under curve (AUC) of the receiver operating characteristics values above 0.7 and true skills statistics (TSS) values above 0.4, highlighting the great potential of SRS data. While only a small proportion of the total area was predicted as highly suitable for each species, our results suggest an increase of suitable habitat over time for the species Platydracus stercorarius and Ocypus ophthalmicus, and an opposite trend for Dinothenarus fossor. Vegetation cover was the most important predictor variable in the majority of the SDMs across all three study species. To better account for intra- and inter-annual variability of population dynamics as well as environmental conditions, a continuation of the monitoring program in GPNP as well as the employment of SRS with higher spatial and temporal resolution is recommended.

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