scholarly journals Impact of the Low Head Dam/Barrage on Fisheries – A Case Study of Giri River of Yamuna Basin (India)

2015 ◽  
Vol 17 (2) ◽  
pp. 119-138
Author(s):  
Harcharan Singh Rumana ◽  
Veliachamy Jeeva ◽  
Sudhir Kumar
Keyword(s):  
Species Richness ◽  
Relative Abundance ◽  
Fish Species ◽  
Habitat Heterogeneity ◽  
Diversity Index ◽  
River System ◽  
Western Himalayas ◽  
Diversity Pattern ◽  
Low Head ◽  
Longitudinal Stretch

Abstract Shannon’s diversity index H’ = pi log2 pi was calculated for 16 fish species. The index was resolved into its components, species richness and relative abundance, to determine which components played a larger role in the determination of diversity pattern. Changes in diversity were correlated with species richness (r), habitat heterogeneity, and hydrological regimes in a longitudinal stretch of 35 km along the river Giri, a major tributary of the Yamuna River system, in Western Himalayas. Abundance differs with change in habitat structures, habitat preference of fish species and water regimes. The decrease in diversity in the lower stretch of about 3-4 km upstream of the barrage was found to be associated with habitat fragmentation and as well as d/s with loss of biotic integrity of aquatic ecosystem due to water scarcity. Species richness was found to be maximum at upper and middle reaches (elevation 650-800 m, msl) of the river, whereas it was low in lower reaches. Change in water chemistry was also noticed at Jatan barrage-low head dam due to impoundment of river water. It is inferred that the regulation of water has an impact on species richness and relative abundance, and on habitat heterogeneity which has decreased due to the change in environmental condition.

Linking fish and crustacean taxonomic composition with seasonal contrasts in the soft-bottom intertidal zone

2020 ◽  
Author(s):  
M. A. Gondal ◽  
S. Iqbal ◽  
U. Atique ◽  
N. U. Saher ◽  
N. A. Qureshi ◽  
...  
Keyword(s):  
Species Richness ◽  
Water Temperature ◽  
Fish Species ◽  
Diversity Index ◽  
Taxonomic Composition ◽  
Primary Objective ◽  
Negative Effect ◽  
Fish Species Composition ◽  
One Year ◽  
Sw Monsoon

Abstract The primary objective of this study was to investigate the seasonal fish and crustacean variations concerning taxonomic composition, species richness, and diversity in sandy beach habitat. For this purpose, we investigated the Sonmiani Hor lagoon area during four distinct seasons, i.e., northeast (NE) monsoon, pre-monsoon, south-west (SW) monsoon, and post-monsoon for one year. During each haul, the net was pulled about 100m along the beach in 0.5m depth. The results showed a strong linear correlation between the diversity index and equitability in fishes (r = 0.978). The diversity index was strong negatively correlated with the abundance and biomass (r = -0.978, -0.972, respectively). The physical attributes like sea surface water temperature and salinity showed a strong negative effect on species assemblages (r = -0.981 and -0.943, respectively). The mean air and water temperature illustrated approximately 3°C difference during NE and pre-monsoon seasons. However, salinity, pH, and electrical conductivity did not show any significant seasonal variabilities. Under the ecological indices, the fish species displayed higher diversity (H’ = 3.19) during SW monsoon, whereas the lowest diversity was observed during pre-monsoon (H’ = 1.58). The equitability and species richness, however, remained more noticeable during SW monsoon (J’ = 0.81). The total number of individuals of fish and crustaceans reached 4799 with 3813 fish individuals and 986 individuals of crustaceans. A total of 27 families of fish while five crustacean families comprising of 30 genera and 38 fish species while ten genera and 17 species of crustaceans were recorded. Liza subviridis displayed the highest abundance among the sampled fish species. In conclusion, fish species constituted a significant part of the coastal fauna in the study area. The seasonal variations displayed distinct variations in fish species composition and diversity.

Acridid (Orthoptera: Caelifera) diversity in agriculture ecosystems at three locations in the Mzab valley, Septentrional Sahara, Algeria

2019 ◽  
Vol 9 (1) ◽  
pp. 18-27 ◽  
Author(s):  
YOUCEF ZERGOUN ◽  
OMAR GUEZOUL ◽  
MAKHLOUF SEKOUR ◽  
NOUREDDINE BOURAS ◽  
MICHAEL D. HOLTZ
Keyword(s):  
Species Richness ◽  
Relative Abundance ◽  
North Africa ◽  
Diversity Index ◽  
Agricultural Activity ◽  
Sampling Effort ◽  
Diverse Group ◽  
Agricultural Ecosystem ◽  
Agricultural Ecosystems ◽  
Low Intensity

Caelifera is one of the largest and most diverse group of insects, and they are the dominant Orthoptera in agriculture ecosystems. We present here an inventory of Acridid fauna of the agricultural ecosystems in the Mzab valley (Septentrional Sahara, Algeria). Grasshoppers were sampled with quadrats in Béni Isguen, Ghardaïa and El-Atteuf, and we have expressed the species richness, sampling effort and relative abundance. The method used is that of quadrats sampling. The results revealed the presence of 27 species, divided into three families, Acrididae, Pyrgomorphidae and Tetrigidae. Among these families, we found that Acrididae are most diverse with six subfamilies. The subfamily Oedipodinae with 10 species was the most abundant, while the subfamily Tetriginae was the least abundant (represented by a one species). The value of the diversity index showed that the cultivated area of Béni Isguen is the most favorable for the development of many Caelifera. The abundance of grasses and low intensity of agricultural activity in this environment favors the presence of Acridid. We found that the Acridid community depends mainly on the nature and richness of vegetation cover, the intensity of agricultural activity and the type of irrigation. Keywords: Grasshopper, agricultural ecosystem, biodiversity, North Africa, Sahara

scholarly journals FISH DIVERSITY OF GHODAGHODI LAKE IN KAILALI, FAR-WEST NEPAL

2017 ◽  
Vol 22 (1) ◽  
pp. 120-126
Author(s):  
Dipendra Joshi ◽  
Bijaya K. C.
Keyword(s):  
Species Richness ◽  
Community Structure ◽  
Fish Species ◽  
Diversity Index ◽  
Fish Diversity ◽  
Channa Striatus ◽  
Illegal Fishing ◽  
Dominant Fish ◽  
Fish Catch ◽  
Excessive Proliferation

Ghodaghodi Lake is an ox-bow perennial lake of Ghodaghodi Lake Complex, situated in Kailali district. The present study was conducted to understand the fish diversity, community structure and distribution pattern in Ghodaghodi Lake. A total of 13 fish species were recorded from the different section of Ghodaghodi Lake, belonging to five order, eight family and eleven genera. According to fish catch the dominant order and family of Ghodaghodi Lake were found to be Cypriniformes (40%) and Cyprinidae (40%) respectively. The dominant fish species of Ghodaghodi Lake was Labeo gonius followed by Mystus tengara, Nandus nandus and Channa striatus. The highest diversity index (2.46), species richness (6.14) and evenness (0.96) of fish were recorded from station III during the month of January. Lowest diversity index (1.75) and evenness (0.90) was found in station II and during the month of October (2.25 and 0.88). Similarly, lowest species richness was found in station I (3.91) and during the month of July (5.82). Fish diversity and number in Ghodaghodi Lake were found to have decreased. This could be due to pollution, illegal fishing and excessive proliferation of aquatic weeds.Journal of Institute of Science and TechnologyVolume 22, Issue 1, July 2017, page: 120-126

scholarly journals KERAGAAN ALAT TANGKAP DAN JENIS IKAN DI PERAIRAN SUNGAI SIAK, PROVINSI RIAU

2017 ◽  
Vol 3 (1) ◽  
pp. 1
Author(s):  
Khoirul Fatah ◽  
Makri Makri
Keyword(s):  
Relative Abundance ◽  
Fish Species ◽  
Diversity Index ◽  
Macrobrachium Rosenbergii ◽  
Fish Diversity ◽  
Fishing Activity ◽  
Fish Yield ◽  
Monthly Data ◽  
Long Line ◽  
Fishing Gears

Sungai Siak merupakan salah satu Sungai besar yang mengalir di Provinsi Riau yang memiliki banyak fungsi salah satu dari fungsi tersebut adalah usaha penangkapan ikan. Kegiatan penangkapan ikan di Sungai Siak menggunakan alat tangkap yang bersifat tradisional dan dilakukan secara kelompok atau perorangan. Penelitian ini bertujuan untuk mengetahui jumlah dan jenis alat tangkap jenis ikan, kelimpahan relatif, dan keanekaragaman jenis ikan yang ada di perairan Sungai Siakpada tahun 2008. Pengambilan data dilakukan di perairan Sungai Siak mulai dari Kuala Tapung sampai Muara Mandau. Pengambilan data alat tangkap dilakukan terhadap nelayan yang sedang mengoperasikan alat tangkap tersebut, sedang pengambilan data jenis dan hasil tangkapan ikan dilakukan secara langsung di lapangan. Pengumpulan data bulanan jenis dan hasil tangkapan dibantu oleh nelayan setempat sebagai enumerator. Hasil penelitian menunjukan terdapat delapanjenis alat tangkap yang beroperasi di Sungai Siak mulai dari Kuala Tapung sampai Muara Mandau yaitu jaring, rawai, tajur, luka, pengilar, belad, dan jala. Alat tangkap jaring dan jala jumlah dan sebarannya paling banyak ditemukan di sepanjang Sungai Siak mulai dari Kuala Tapung sampai Muara Mandau, lalu disusul alat tangkap belad. Untuk jenis ikan ditemukan 60 jenis ikan yang tertangkap dari berbagai jenis alat tangkap, ikan tersebut berasal dari 12 famili dan satu jenis krustacea yaitu udang galah (Macrobrachium rosenbergii), dari 12 famili tersebut kelimpahan relatif didominansi oleh famili Cyprinidae dan Engraulidae baik pada bulan Juni, Agustus, dan Oktober. Jika dilihat dari nilai Indeks keanekaragaman pada beberapa stasiun Sungai Siak mempunyai nilai indeks berkisar antara 0,5-3,0. Siak River one of the biggest river at Riau Province has a multipurpose function including fisheries. Fishing activity at the river used a traditional gear which was operated by individual or group fisherman. A study aimed to investigate number and type of fishing gears, fish species caught, relative abundance and fish diversity of the Siak River was conducted from Kuala Tapung until Muara Mandau in 2008. Data of fishing were collected from the fisherman operated the fishing gears. Monthly data on fish species caught and fish yield were collected directly by enumerator. Results of the study showed that eight kinds of fishing gears, namely gillnets, long line, hand line, traps (luka, pengilar, and belad), filtering device, and cast net were operated. The dominant fishing gear operated was gillnet and cast net and filtering device in the next. About sixty fish species from the twelve families and giant freshwaters prawn (Macrobrachium rosenbergii) were caught using those fishing gears. During June, August, and October, the relative abundance of the fish species was dominated by family of Cyprinidae and Engraulidae. The fish diversity index of the Siak River ranged from 0.5-3.0.

scholarly journals Using empirical and simulated data to study the influence of environmental heterogeneity on fish species richness in two biogeographic provinces

2014 ◽  
Author(s):  
Philippe Massicotte ◽  
Raphael Proulx ◽  
Gilbert Cabana ◽  
Marco Rodriguez
Keyword(s):  
Species Richness ◽  
Fish Species ◽  
Habitat Heterogeneity ◽  
Environmental Variables ◽  
Spatial Scales ◽  
Simulated Data ◽  
Aquatic Communities ◽  
Modeling Framework ◽  
Heterogeneous Habitats ◽  
Biogeographic Provinces

Loss of species richness in aquatic ecosystems is occurring rapidly and many factors, including habitat heterogeneity, have been suggested to affect the diversity of aquatic communities. We used fish community data (> 200 species) from extensive surveys conducted in two biogeographic provinces (extent > 1000 km) in North America to test the hypothesis that fish species richness is greater in more heterogeneous habitats (grain < 10 km2). Our tests are based on samples collected at nearly 800 stations over a period of five years. Using a set of environmental variables routinely measured by monitoring programs and a random placement model of community assembly, we demonstrate that fish species richness in coastal ecosystems is associated locally with the spatial heterogeneity of environmental variables but not with their magnitude. The observed effect of heterogeneity on species richness was substantially greater than that generated by simulations. Our modeling framework opens avenues for targeted conservation of habitat heterogeneity at broader temporal and spatial scales.

scholarly journals KEANEKARAGAMAN JENIS IKAN DI SUNGAI DIGOEL DISTRIK EDERA KABUPATEN MAPPI

2018 ◽  
pp. 1-14
Author(s):  
Robert S. Buhdy ◽  
Norce Mote ◽  
Edy HP. Melmambessy
Keyword(s):  
Species Diversity ◽  
Relative Abundance ◽  
Fish Species ◽  
Diversity Index ◽  
Survey Method ◽  
Fishing Gear ◽  
Species Diversity Index ◽  
Dominance Index ◽  
Abundance Index ◽  
Evenness Index

Fisheries production in the mainland waters of Mappi Regency is larger (27.48%) compared to marine fisheries (8.53%).  Edera District is one of the districts in Mappi District which contributes to the potential of fisheries specifically for mainland waters. This study aims to determine the diversity of fish species in the Digoel River, Edera District, Mappi Regency. The fishing gear used is gill nets, stocking nets, fixed lines, fishing rods and spoon nets (tanggo).  The study was conducted in August - October 2017 using the survey method. The variables analyzed were the species diversity index, evenness index, dominance index and relative abundance index.  The results of the study obtained 28 species of fish which were divided into 8 orders of 20 families and 28 species. The value of the diversity of fish species is moderate, the Evenness value is relatively stable and evenly distributed, the type of dominance in Di shows that there is no dominance of species and the relative abundance of Kr is medium. Keywords:  Digoel River; Diversity; Evenness; Dominance and Relative Abundance.

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