scholarly journals Struktur Komunitas Odonata di Kawasan Wana Wisata Curug Semirang Kecamatan Ungaran Barat, Semarang

2017 ◽  
Vol 19 (1) ◽  
pp. 69
Author(s):  
Frendi Irawan ◽  
Mochamad Hadi ◽  
Udi Tarwotjo
Keyword(s):  
Community Structure ◽  
Life Cycle ◽  
Environmental Factors ◽  
Common Species ◽  
Point Count ◽  
River Habitat ◽  
Point Count Method ◽  
Physical Environmental Factors ◽  
The Relationship ◽  
Key Words Community Structure

Dragonflies role as a predator in an ecosystem and become a healthy aquatic bio-indicators related to the life cycle. The diversity of habitat, food and predators affect community structure dragonfly. This study aims to determine the composition and community structure dragonfly morning and afternoon as well as the relationship with the physical environmental factors on four habitat in Semirang waterfall. Research using transect Point Count method. Statistically, the biodiversity of odonata in each habitat is significantly different. The results shows there are 15 species from 10 Family in morning observations and 12 species of 6 Family in afternoon observations, with a total of 17 species of 10 family of odonata. Biodiversity in each station is low to moderately with high evenness. The highest abundance found in river habitat without the canopy during the afternoon that Vestalis luctuosa (61.29%), while the lowest abundance found in the the canopied river habitat when afternoon that is Drepanosticta spatulifera (1.33%). Common species at area of Semirang waterfall are Euphaea variegata, Orthetrum sabina and Vestalis luctuosa. Endemic species at area of Semirang waterfall are Heliocypha fenestrata, Drepanosticta spatulifera and D. sundana. Key words : Community structure, Odonata, Semirang waterfall

Struktur Komunitas Capung di Kawasan Wisata Curug Lawe Benowo Ungaran Barat

2016 ◽  
Vol 18 (2) ◽  
pp. 70
Author(s):  
Alamsyah Elang Nusa Herlambang ◽  
Mochamad Hadi ◽  
Udi Tarwotjo
Keyword(s):  
Community Structure ◽  
Environmental Conditions ◽  
Habitat Type ◽  
Common Species ◽  
Individual Species ◽  
Point Count ◽  
The Stability ◽  
Number Of Individuals ◽  
Dragonfly Species ◽  
Key Words Community Structure

Dragonflies have an important role for the stability of the ecosystem that is as predator and prey at the same time. The availability of food resources and optimal environmental conditions affect the species richness of dragonflies in the habitats. Reasearch on dragonfly comunity structure aims to find out the differences of community structure in each habitat type in the region of Curug Lawe Benowo. The research was conductet in 4 different stations which focus on species of dragonfly, amount of an individual species, habitats, environmental conditions, and the corellation between the variables. The method used is point count. The results showed that there are 19 dragonfly species which came from 7 different Family. The total number of individuals encountered from 4 stations is 205. The common species that can be found in all of the stations is Euphaea variegata. The level of diversity are medium, the level of evenness is fairly even. Similarity of species in any habitat types indicate that the habitats has a three kind of similarity levels that is fairly equal, less equal and not equal. Data analysis shows that there is a corellations between environmental conditions, and dragonfly species, affecting abundance and distributions of a dragonfly in the habitats, and can be used to describe dragonflies community structure in the region. Key words: Community structure, dragonfly, Curug Lawe-Benowo

scholarly journals A Fixed-radius Point Count Method for Nonbreeding and Breeding Season Use

The Auk ◽  
1986 ◽  
Vol 103 (3) ◽  
pp. 593-602 ◽  
Author(s):  
Richard L. Hutto ◽  
Sandra M. Pletschet ◽  
Paul Hendricks
Keyword(s):  
Bird Species ◽  
Common Species ◽  
Bird Abundance ◽  
Point Count ◽  
Bird Density ◽  
Count Method ◽  
Species Abundances ◽  
Fixed Radius ◽  
Point Count Method ◽  
A Site

Abstract We provide a detailed description of a fixed-radius point count method that carries fewer assumptions than most of the currently popular methods of estimating bird density and that can be used during both the nonbreeding and breeding seasons. The method results in three indices of bird abundance, any of which can be used to test for differences in community composition among sites, or for differences in the abundance of a given bird species among sites. These indices are (1) the mean number of detections within 25 m of the observer, (2) the frequency of detections within 25 m of the observer, and (3) the frequency of detections regardless of distance from the observer. The overall ranking of species abundances from a site is similar among the three indices, but discrepancies occur with either rare species that are highly detectable at great distances or common species that are repulsed by, or inconspicuous when near, the observer. We argue that differences in the behavior among species will preclude an accurate ranking of species by abundance through use of this or any other counting method in current use.

scholarly journals Diversity and population dynamics of Odonata (Insecta: Odonata) in rice growing area of central Gujarat

2017 ◽  
Vol 30 (3) ◽  
pp. 149
Author(s):  
V. B. Rohmare ◽  
Darshana M. Rathod ◽  
B. M. Parasharya
Keyword(s):  
Population Dynamics ◽  
Community Structure ◽  
Relative Abundance ◽  
Paddy Field ◽  
Dominant Species ◽  
Diversity Index ◽  
Fish Farm ◽  
Paddy Fields ◽  
Point Count ◽  
Point Count Method

Odonates diversity was studied in Paddy field of central Gujarat during 2012 to 2015. Total 39 species belonging to 25 genera, under six families and two suborders were recorded. Total 17 species of Zygoptera (damselflies) and 22 species of Anisoptera (dragonflies) were recorded. Community structure and population dynamics of adult odonates were studied at Lingda village during July to December, 2012 through monitoring their population by point count method on three microhabitats (paddy field, village pond and fish farm). Total seventeen species were encounterd in the point count. Diversity index (H’) was highest (2.13) for paddy fields followed by fish farm (2.07) and village pond (1.99). Evenness value of the odonates also ranged between 0.7 and 0.8. Total four species (<em>Viz.</em> Ditch Jewel (25.0%), Green Marsh Hawk (17%), Ruddy Marsh Skimmer and Coromandal Marsh Dart (16% each) were dominant species in all three microhabitats. Both the suborders Anisoptera (dragonfly) and Zygoptera (damselfly) showed similar trend of population fluctuation during the study. Relative abundance was higher and remained constant during 4<sup>th</sup> week of September to 2<sup>nd</sup> week of October.

Comparative Analysis of Fungal Diversity and Community Structure of Different Volcanic Soils in Wudalianchi, China

2021 ◽  
Vol 50 (2) ◽  
pp. 327-334
Author(s):  
Fan Yang ◽  
Liqiang Mu ◽  
Qingyang Huang ◽  
Lihong Xie ◽  
Hongjie Cao ◽  
...  
Keyword(s):  
Community Structure ◽  
Environmental Factors ◽  
Fungal Community ◽  
Fungal Diversity ◽  
Chemical Properties ◽  
Fungal Community Structure ◽  
Α Diversity ◽  
Physical And Chemical ◽  
The Relationship ◽  
Soil Environmental Factors

The relationship between the fungal community characteristics and soil environmental factors of volcanic ecosystem in Wudalianchi, China were investigated. The soil fungal community structure and diversity of new, old, and non-erupting volcanos were explored through highthroughput sequencing technology. The result showed that the physical and chemical properties of three plots were significantly different. Through sequencing 578 species, 366 genera, 202 families, 89 orders, 32 classes, and 11 phyla were detected. Among them Ascomycota and Basidiomycota were the dominant fungi phyla. The relative abundance of various flora determined by phylum classification showed significant differences. The Shannon, Simpson, Ace, and Chao1 indices for the soil fungi in the three plots were also significantly different. Redundancy and correlation analyses showed that the α diversity of fungi was significantly correlated with pH, organic matter and total nitrogen in the soil. These results indicate that soil environmental factors influence the fungal diversity in the different volcanic ecosystems in Wudalianchi, China. Bangladesh J. Bot. 50(2): 327-334, 2021 (June)

scholarly journals Struktur Komunitas Mikroartropoda Tanah di Lahan Pertanian Organik dan Anorganik di Desa Batur Kecamatan Getasan Salatiga

2017 ◽  
Vol 18 (2) ◽  
pp. 164
Author(s):  
Shifa Aulia Husna ◽  
Mochamad Hadi ◽  
Rully Rahadian
Keyword(s):  
Community Structure ◽  
Environmental Factors ◽  
Water Content ◽  
Soil Nutrients ◽  
Sampling Method ◽  
Organic Materials ◽  
Soil Sampling ◽  
Soil Microarthropods ◽  
Physical Environmental Factors

Soil microarthropods is a arthropods that have an important role in decomposing organic materials and soil nutrients. On the farmland there is organic materials content and soil nutrients that abundants enough, because the addition of manure as a source of energy in the ground. The research was conducted in August-October 2015 took place in the field of organic and inorganic farmland in the Batur Village, Getasan Sub-district, Salatiga. This study aimed to examine the soil microarthropods community structure in organic and inorganic farmland as well as the effect of chemical and physical environmental factors to community structure of soil microarthropods. The study was conducted with samples of soil sampling method (PCT) and extracted using Barlese Funnel Extractor. Statistically show that diversity of soil microarthropods between organic and inorganic farmland are not significantly different. There is found 28 taxa of soil microarthropods in organic farmland and 23 taxa in inorganic. The highest total individual density of the taxa are exist in the organic farmland (2260 individual/ m²). The highest abundance of soil microarthropods taxa in inorganic farmland are Carabidae (26,55%) dan Prostigmata (13,27%), while in inorganic farmland are Carabidae (17,24%) dan larva Coleoptera (13,79%). The evenness of soil microarthropods taxa in organic farmland are much low compared with inorganicfarmland, because there is a dominant taxa (Carabidae). There is an influence relation between the chemical and physical environmental factors including water content, porosity, nutrient, and organic materials with community structure of soil microarthropods. Key words:Community structure, Soil microarthropods, Organic and inorganic farmland

Sound recording of bird vocalisations in forests. I. Relationships between bird vocalisations and point interval counts of bird numbers - a case study in statistical modeling

2004 ◽  
Vol 31 (2) ◽  
pp. 195 ◽  
Author(s):  
R. B. Cunningham ◽  
D. B. Lindenmayer ◽  
B. D. Lindenmayer
Keyword(s):  
Sound Recording ◽  
Activity Data ◽  
Point Count ◽  
Point Counts ◽  
Number Of Species ◽  
Eastern Australia ◽  
Vocal Activity ◽  
Fragmented Forests ◽  
Point Count Method ◽  
The Relationship

Morning vocal activity data for birds were collected using automatic sound recorders at 165 sites in fragmented forests at Tumut in south-eastern Australia. A model was developed to describe the statistical properties of the vocal activity data and study the relationship between the number of 'elements' (or notes) broadcast by birds and the number of birds recorded by human observers. We discuss the practical issues of finding a model where variance heterogeneity and skewness is a feature of the data, while the context of the problem required that multiplicative relationships be preserved. A satisfactory fit to our vocal activity data was obtained by using a Gamma distribution.For most groups of birds, the observed relationships between vocal activity and the number of birds recorded by human point counts were weak but statistically significant.Our analysis suggests that these data provide limited useful information about vocal activity per bird. Automatic sound-recording data may be informative for drawing inferences about temporal patterns in vocal activity but do not seem useful as a method for estimating the abundance of birds. A significant relationship was identified between the number of species vocalising, as measured by sound recorders, and the number of species observed by point count method. However, the relationship was far from isometric and there were many more species detected by the sound recorders than by human observers.Results from analyses of vocal activity data gathered at Tumut were confirmed by additional data obtained in a subsequent, small calibration study in the Namadgi National Park in the Australian Capital Territory.

scholarly journals Struktur Komunitas Mikroartropoda Tanah di Lahan Pertanian Organik dan Anorganik di Desa Batur Kecamatan Getasan Salatiga

2016 ◽  
Vol 18 (2) ◽  
pp. 157
Author(s):  
Shifa Aulia Husna ◽  
Mochamad Hadi ◽  
Rully Rahadian
Keyword(s):  
Community Structure ◽  
Environmental Factors ◽  
Water Content ◽  
Soil Nutrients ◽  
Sampling Method ◽  
Organic Materials ◽  
Soil Sampling ◽  
Soil Microarthropods ◽  
Physical Environmental Factors

Soil microarthropods is a arthropods that have an important role in decomposing organic materials and soil nutrients. On the farmland there is organic materials content and soil nutrients that abundants enough, because the addition of manure as a source of energy in the ground. The research was conducted in August-October 2015 took place in the field of organic and inorganic farmland in the Batur Village, Getasan Sub-district, Salatiga. This study aimed to examine the soil microarthropods community structure in organic and inorganic farmland as well as the effect of chemical and physical environmental factors to community structure of soil microarthropods. The study was conducted with samples of soil sampling method (PCT) and extracted using Barlese Funnel Extractor. Statistically show that diversity of soil microarthropods between organic and inorganic farmland are not significantly different. There is found 28 taxa of soil microarthropods in organic farmland and 23 taxa in inorganic. The highest total individual density of the taxa are exist in the organic farmland (2260 individual/ m²). The highest abundance of soil microarthropods taxa in inorganic farmland are Carabidae (26,55%) dan Prostigmata (13,27%), while in inorganic farmland are Carabidae (17,24%) dan larva Coleoptera (13,79%). The evenness of soil microarthropods taxa in organic farmland are much low compared with inorganicfarmland, because there is a dominant taxa (Carabidae). There is an influence relation between the chemical and physical environmental factors including water content, porosity, nutrient, and organic materials with community structure of soil microarthropods. Key words:Community structure, Soil microarthropods, Organic and inorganic farmland

scholarly journals Life-cycle mediated effects of urbanization on parasite communities in the estuarine fish, Fundulus heteroclitus

2018 ◽  
Author(s):  
James M. Alfieri ◽  
Tavis K. Anderson
Keyword(s):  
Community Structure ◽  
Life Cycle ◽  
Fundulus Heteroclitus ◽  
Parasite Community ◽  
Estuarine Fish ◽  
Parasite Communities ◽  
Mediated Effects ◽  
Physicochemical Factors ◽  
Primary Parasite ◽  
The Relationship

AbstractThis study examined the relationship between urbanization and parasite community structure in the estuarine fish, Fundulus heteroclitus. We measured landscape and physicochemical factors associated with urbanization at 6 sites from 4 collection periods. Concurrently, we quantified the metazoan parasite community in F. heteroclitus collected at those sites, with 105 fish studied per site during the 4 collection periods. Parasite community composition differed between sites. Variation in the prevalence and intensity of infection of two indirect life-cycle parasites, Lasiocotus minutus and Glossocercus caribaensis, were the primary parasite species that determined this pattern. Sediment potassium and aquatic osmium were the most important physicochemical factors in structuring parasite communities, and habitat dominance was the most important landscape factor. Our data supports the hypothesis that urbanization, acting at both landscape and physicochemical scales, can have a significant impact on parasite community structure. This, however, varied by parasite life history: there was little effect of urbanization on the prevalence and intensity of direct life-cycle parasites, but significant variation was dedicated for indirect life-cycle parasites. This study demonstrates how anthropogenically driven landscape change influences fine-scale parasite population dynamics.

scholarly journals Ecology Of Lesser Sulphur Creasted Cockatoo Cacatua Sulphurea Sulphurea At Rawa Aopa Watumohai National Park, Southeast Sulawesi

2018 ◽  
Vol 5 (2) ◽  
pp. 177
Author(s):  
Dudi Nandika ◽  
Dwi Agustina
Keyword(s):  
National Park ◽  
Habitat Management ◽  
Field Research ◽  
Common Species ◽  
Daily Activities ◽  
Direct Visualization ◽  
Habitat Conditions ◽  
Point Count ◽  
Belt Transect ◽  
Point Count Method

The Lesser Sulphur-crested cockatoos (Cacatua sulphurea) are among the most endangered parrots in Eastern Indonesia. This bird was common species, but since 30 years ago, it was apparent that the decline of the species had been ‘dramatic’ and that it was ‘threatened throughout its range. The best chance to conserve the nominate race lines in Southeast Sulawesi where there is a population of perhaps 50-100 individuals remaining in Rawa Aopa Watumohai National Park [RAWNP]. Direct visualization could be carried out, employing a belt transect and point count method to construct a census. The field research on February until March 2011, founded 55 cockatoos from10 points of all 19 points different survey locations. The research method using scan sampling per 3 menit durations with recorded about 1110 points from 12 days of behavior observations. The daily activities result are: resting 68,9%; moving 21,1%; and eating 10%. On breeding process its begin from grooming or courtship 9 menits and mating 83 seconds. Cockatoos eating proportion: fruits 64,3%; flowers 14,3%; young leafs 14,3% and seeds 7,1%. The research founded eight nestholes trees, from Kolaka Parinarium carymbosum and Kuiya Alatonia scholaris. The cockatoo daily activites and habitat conditions are based data for  supporting conservation habitat management in the future.

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