scholarly journals VARIACIÓN ESPACIAL EN COMUNIDADES DE ESPONJAS DE LA COSTA ORIENTAL DE BAHÍA DE COCHINOS, CUBA

2009 ◽  
Vol 1 ◽  
pp. 95 ◽  
Author(s):  
Hansel Caballero ◽  
Linnet Busutil ◽  
Yanet García ◽  
Pedro M. Alcolado
Keyword(s):  
East Coast ◽  
Patch Reef ◽  
El Paso ◽  
Common Species ◽  
Line Transect ◽  
Ecological Zones ◽  
Predominant Species ◽  
Open Sea ◽  
Aplysina Fistularis ◽  
Line Transect Method

En octubre del 2002 se estudiaron las comunidades de esponjas en cuatro localidades del arrecife de la costa este de Bahía de Cochinos, Cuba. En cada localidad se establecieron sitios de muestreo de esponjas en las zonas ecológicas de cabezos coralinos (3 m), terraza somera (6-10 m) y terraza profunda (15 m). Se utilizó el método de transecto lineal de 10 m como unidad de muestreo para medir el cubrimiento del fondo y el marco cuadrado de 1 m para estimar la densidad de la comunidad. Los índices de heterogeneidad y de riqueza de especies mostraron variabilidad entre sitios y cierta tendencia a incrementarse con la profundidad. Se encontraron 30 especies pertenecientes a 19 familias y 21 géneros. Las especies más comunes fueron Mycale laevis, Aplysina cauliformis, Cliona aprica, Aplysina fistularis y Ectyoplasia ferox, las cuales conformaron el 48% del total de individuos identificados. La densidad fue moderada (2-8 ejemplares/m2) y se encontró variación entre sitios. La estación más cercana a mar abierto mostró un valor inferior, posiblemente por ser la más dañada tras el paso del huracán en el 2001. El estado general de la comunidad fue bueno, según los valores de diversidad alcanzados y las especies predominantes, aunque se muestran evidencias de afectaciones recientes producto de un huracán.The sponge communities at four locations on the east coast of Bahía de Cochinos were surveyed in October 2002. At each location, sampling sites were established in the ecological zones of patch reef (3 m), shallow terrace (6-10 m), and deep terrace (15 m). The line-transect method with a 10 m line as sampling unit was used to measure sponge bottom coverage, and a 1 m square grid was used to quantify sponge community density. Species heterogeneity and species richness indices showed variability among sites and tended to increase with depth. Thirty species belonging to 19 families and 21 genera were found. The most common species were Mycale laevis, Aplysina cauliformis, Cliona aprica, Aplysina fistularis, and Ectyoplasia ferox, which comprised 48% of the total individuals identified. Sponge density was moderate (2-8 specimens/m2) and showed variation among sites. The nearest station to open sea showed a lower density value, possibly due to disturbance from the passage of a hurricane in 2001. The general condition of the community was good, based on the diversity values reached and the predominant species, although evidence of impacts from recent hurricane were observed. 

Abundance Estimation of Diving Animals by the Double-Platform Line Transect Method

Biometrics ◽  
2003 ◽  
Vol 59 (3) ◽  
pp. 512-520 ◽  
Author(s):  
Hiroshi Okamura ◽  
Toshihide Kitakado ◽  
Kazuhiko Hiramatsu ◽  
Mitsuyo Mori
Keyword(s):  
Abundance Estimation ◽  
Line Transect ◽  
Line Transect Method

scholarly journals Density and Flock Size of the Raven (Corvus corax) In the Orawa - Nowy Targ Basin During Non-Breeding Season

Ring ◽  
2006 ◽  
Vol 28 (2) ◽  
pp. 119-125
Author(s):  
Michał Ciach ◽  
Dominik Wikar ◽  
Małgorzata Bylicka
Keyword(s):  
Breeding Season ◽  
Early Spring ◽  
Food Resources ◽  
High Density ◽  
Line Transect ◽  
Flock Size ◽  
Early Winter ◽  
Corvus Corax ◽  
Line Transect Method ◽  
Breeding Seasons

Density and Flock Size of the Raven (Corvus corax) In the Orawa - Nowy Targ Basin During Non-Breeding Season During the 2002/2003-2004/2005 non-breeding seasons the density of the Raven in the open habitats of the Orawa - Nowy Targ Basin was studied by line transect method. The results were analysed in four periods (autumn, early winter, winter and early spring). The median density of Ravens did not differ significantly between individual periods and was respectively: 3.5, 3.8, 4.8 and 3.8 indiv. / 10 km. Number of birds during particular controls varied from 1.0 to 24.8 indiv. / 10 km. However, while excluding flocks, the median density of single individuals and pairs of the Raven was considerably lower and in subsequent periods reached respectively: 2.2, 2.4, 2.2 and 1.7 indiv. / 10 km. Flock size did not differ significantly between individual periods. Single individuals and, less often, groups of two birds were recorded mostly. Small (3-5 indiv.) and medium (6-15 indiv.) flocks were recorded rarely and large flocks (16 indiv. and above) - only exceptionally. The high density and strong fluctuations of abundance of Ravens were determined by flocks presence, which was probably linked to irregular occurrence of food resources.

scholarly journals STUDI EKOLOGI SUMBERDAYA TERIPANG DI NEGERI PORTO PULAU SAPARUA MALUKU TENGAH

2014 ◽  
Vol 1 (1) ◽  
pp. 32-42
Author(s):  
Yona Aksa Lewerissa
Keyword(s):  
Sea Cucumber ◽  
Water Environment ◽  
Turbidity Current ◽  
Line Transect ◽  
Community Structures ◽  
Sea Cucumbers ◽  
Environment Factors ◽  
Line Transect Method ◽  
Environment Measurement

Background: Decreasing of sea cucumber resources on numbers and size of fishing capture in Negeri Porto waters influenced its community structures. Further, water environment steadiness will questionable. For this reason, study was done to analyzed community structures of sea cucumbers include of numbers species found, density, potency, species presence frequency, distribute pattern, ecology index and environment measurement. Method: Research done on February to May, 2008 at Negeri Porto used Line Transect Method. Result: showed there were eight species of sea cucumbers found (potency as much as 12.286 individuals). Bohadschia marmorata got highest in numbers species found, density, potency and species presence frequency. There were three distribute pattern of sea cucumbers found wich are uniform, random and group. Conclusion: Sea cucumbers diversity was in lower, species are closed to compatible. B. marmorata and Holothuria edulis are tends to dominate this water. Environment factors such temperature, pH, salinity, DO, turbidity, current and sediment distribute showed that Porto waters was suitable to sea cucumbers growth.

scholarly journals Estimation of Orangutan Population in Sibongkaras Pakpak Bharat Village Forest Area

Elkawnie ◽  
2020 ◽  
Vol 6 (1) ◽  
pp. 133
Author(s):  
Juhardi Sembiring ◽  
Taufiq Siddiq Azvi
Keyword(s):  
Sampling Method ◽  
Data Retrieval ◽  
Forest Area ◽  
Line Transect ◽  
Habitat Conditions ◽  
Dominant Position ◽  
Purposive Sampling ◽  
Management Measures ◽  
Nahdlatul Ulama ◽  
Line Transect Method

Abstract : Orangutan is classified as an endangered species. Forest clearance for a variety of purposes and functions over the region led to the limited habitat for orangutans. Orangutans habitat is fragmented into several regions led to the survival of a population of a species depends on habitat conditions. Performing a nest survey is important to give a deeper understanding of the ecology and help determine the best protective management measures. We provide basic data of orangutan density and orangutan nesting characteristics in protected forest area Sibongkaras village. This study was conducted in April 2019 until June 2019 in protected forest area Sibongkaras village, Pakpak Bharat. Tracking begins with observed the presence of a nest based on a purposive sampling method. And data retrieval was done by line transect method. Data analyzed at Universitas Nahdlatul Ulama Sumatera Utara. Our result showed that the orangutan population density was 0.0072 individuals/km2 or 0.72 individuals/ha. The dominant position of the nest is in a position which is a position I nest close to the main stem of the tree with the nest number 13 (43.3%). Generally, the nest is found at an altitude of  >15 meters with a sum of 27 nests (90%).Abstrak : Orangutan diklasifikasikan sebagai spesies yang terancam punah. Penebangan hutan untuk berbagai tujuan dan fungsi di kawasan tersebut menyebabkan terbatasnya habitat orangutan. Habitat orangutan yang terfragmentasi menjadi beberapa wilayah menyebabkan kelangsungan hidup suatu populasi suatu spesies tergantung pada kondisi habitat. Melakukan survei sarang penting untuk memberikan pemahaman yang lebih dalam tentang ekologi dan membantu menentukan langkah-langkah manajemen perlindungan terbaik. Kami menyediakan data dasar kepadatan orangutan dan karakteristik sarang orangutan di kawasan hutan lindung Desa Sibongkaras. Penelitian ini dilakukan pada bulan April 2019 hingga Juni 2019 di kawasan hutan lindung Desa Sibongkaras, Pakpak Bharat. Pengamatan dimulai dengan mengamati keberadaan sarang berdasarkan metode purposive sampling. Dan pengambilan data dilakukan dengan metode transek garis. Data yang diperoleh di analisis di Universitas Nahdlatul Ulama Sumatera Utara. Hasil Penelitian kami menunjukkan kepadatan populasi orangutan di 0,0072 individuals/km2 atau 0,72 individu / ha. Posisi sarang yang dominan adalah pada posisi sarang yang berada di posisi paling dekat dengan batang utama, dengan jumlah sarang 13 (43,3%). Umumnya sarang ditemukan di ketinggian > 15 meter dengan jumlah 27 sarang (90%).

scholarly journals Biodiversity Status of the Immediate Vicinity of an Iron and Steel Recycling Factory in Ile-Ife, South-Western Nigeria

2015 ◽  
Vol 7 (1) ◽  
pp. 45-51
Author(s):  
Oludare Oladipo AGBOOLA ◽  
Olalekan Oluwatoyosi SALAMI ◽  
Stephen OYEDEJI
Keyword(s):  
Plant Species ◽  
Native Species ◽  
Floristic Composition ◽  
Common Species ◽  
Line Transect ◽  
Panicum Maximum ◽  
Iron And Steel ◽  
Reported Study ◽  
Plant Families ◽  
Almost All

Floristic composition of vegetation communities of 27 plots established along a line transect in the four major directions was investigated in the vicinity of an Iron and Steel factory in Ile-Ife, Nigeria. The aim of the study was to document the plant species composition (biodiversity) of the plant communities found within the 350 m perimeter of the facility in the study area, which will serve as a reference data, as there was no reported study for the area prior to the establishment of the factory. Plant species were identified to species level in a 10 x 10 m plot and the occurrence of each species was described in semi-quantitative terms. The vegetation is heterogeneous in nature having 31 species of tree saplings and climbers, 26 of shrubs, 15 of herbaceous plants and 4 of grasses. These 107 plant species belong to forty six (46) plant families. The dominant families included Apocynaceae and Papilionaceae (9 species), Sapindaceae (8 species), Euphorbiaceae (6 species), Asteraceae, Cucurbitaceae, Malvaceae, Poaceae, Sterculiaceae and Verbenaceae (4 species). Among the diverse species recorded, Chromolaena odorata formed a ticket in almost all the plots. Other common species included Albizia zygia, Alchornea laxiflora, Aspilia africana, Cnestis ferruginea, Combretum sp., Icacina tricantha, Ipomoea involucrata, Momordica foetida, Panicum maximum, Paullinia pinnata, Simicrata welwitschii and Vigna gracilis. The index of similarity of the plots ranged from 6.1 to 71.8%. The potential and vulnerability of the species were highlighted. Adherence to and enforcement of environmental regulations was recommended for preservation of the native species.

A Remark on the Line Transect Method

1982 ◽  
Vol 24 (2) ◽  
pp. 191-195 ◽  
Author(s):  
D. Stoyan
Keyword(s):  
Line Transect ◽  
Line Transect Method

Estimating Relative Densities of Breeding Birds by the Line Transect Method

Oikos ◽  
1975 ◽  
Vol 26 (3) ◽  
pp. 316 ◽  
Author(s):  
O. Järvinen ◽  
R. A. Väisänen ◽  
O. Jarvinen ◽  
R. A. Vaisanen
Keyword(s):  
Breeding Birds ◽  
Line Transect ◽  
Line Transect Method

scholarly journals Inventarisasi Jenis-Jenis Kadal (Sub Ordo Sauria) di Kawasan Hutan Primer, Hutan Sekunder dan Pemukiman di Desa Parek Kacamatan Air Besar Kabupaten Landak

2019 ◽  
Vol 8 (2) ◽  
Author(s):  
Jepri Noperese Ari Hepi Yanti, Tri Rima Setyawati
Keyword(s):  
Secondary Forest ◽  
Primary Forest ◽  
Line Transect ◽  
Line Transect Method ◽  
Open Forests

Parek Village Air Besar District Landak Regency has two types of forests, primary forest and secondary forest. Parek villagers generally open forests for farming, the activities of these residents can disrupt the existence of the Sauria Sub-Order. The purpose of this study was to determine the species of Sauria Sub-Order in Parek Village.  The research was conducted by exploration method which was combined with the line transect method in the area of primary forest, secondary forest and settlement. The results of the study found 7 species from the Sauria Sub-Order there are Gonocephalus borneensis, Tachydromus sexlineatus, Cyrtodactylus sp., Hemidactylus sp., Draco sp., Eutropis multifasciata and Apterygodon vittatum which belong to 4 families, Scincidae, Gekkonidae, Agamidae and Lacertidae.

scholarly journals Gastropods In Mangrove Forest Of Tongkeina Village, Bunaken Sub-District, City Of Manado

2019 ◽  
Vol 10 (1) ◽  
pp. 1
Author(s):  
Dewanti Y Talumingan ◽  
Ferdinand F. Tilaar ◽  
Jety K. Rangan ◽  
Maartinus M Baroleh ◽  
Victor N. R. Watung ◽  
...  
Keyword(s):  
Distribution Pattern ◽  
Mangrove Forest ◽  
Distribution Patterns ◽  
Common Species ◽  
Line Transect ◽  
Sampling Point ◽  
Mangrove Forests ◽  
Mangrove Species ◽  
Long Line ◽  
Made In

This research aims to determine the types or species of gastropod and its distribution in mangrove forests in Tongkeina village and to know the species of mangrove in Tongkeina village. The Research was conducted on one sampling point with one 100 meters long line transect which was is laid perpendicular to the outer direction of the mangrove.  To collect gastropod samples, three quadrates with a size of 10x10meters with a distance between the quadrate 5 meters were made. In the quadrate, 15 subquadrates sized 1x1meters were also made. Based on the results, there were 6 species of gastropods and two distribution patterns of i.e., Cluster the species of the Littoraria scabra, Angustassiminea castanea, Terebralia sulcate. The uniform distribution pattern is Ischinocerithium rostratum, Caliostoma jujubinum, and Nerita senegalensis. There are ten mangrove species found and  the most common species is Soneratia alba with a total of 27 individuals.Keywords: Gastropods, forest, Mangrove, Tongkeina village ABSTRAKPenelitian ini bertujuan untuk mengetahui Jenis-jenis gastropoda serta persebaran pada hutan mangrove di Kelurahan Tongkeina dan untuk mengetahui Jenis-jenis mangrove di Kelurahan Tongkeina. Penelitian hanya di lakukan satu titik pengambilan sampel dimana dibuat 1 line transek dengan Panjang 100meter yang di tarik tegak lurus dari arah terluar mangrove kemudian dibuat 3 kuadrat dengan ukuran 10x10meter dengan jarak antara kuadrat 5 meter, dan di dalam kuadrat dibuat 15 subkuadrat berukuran 1x1 meter. Berdasarkan penelitian hasil ditemukan ada 6 spesies gastopoda dan dua pola persebaran Gastropoda yaitu mengelompok dan seragam, spesies mengelompok yaitu Littoraria scabra, Angustassiminea castanea, Terebralia sulcate. Pola persebaran seragam yaitu Ischinocerithium rostratum, Caliostoma jujubinum, Nerita senegalensis. Mangrove ditemukan 10 Spesies yang terbanyak adalah Soneratia alba dengan jumlah 27 individu.Kata kunci: Gastropoda, Hutan, Mangrove, Kelurahan Tongkeina.

scholarly journals HABITAT DAN SEBARAN TIKUS BERKANTUNG (Echymipera rufescens) DI PULAU WAMAR KABUPATEN KEPULAUAN ARU

2020 ◽  
Vol 8 (1) ◽  
pp. 109
Author(s):  
Charolina Larwuy ◽  
Maya Marsya Silvia Puttileihalat ◽  
Lesly Latupapua
Keyword(s):  
Sweet Potato ◽  
Pattern Analysis ◽  
Horizontal Distribution ◽  
Line Transect ◽  
Wild Animals ◽  
Line Transect Method ◽  
Index Value ◽  
Line Intercept

The purpose of this research was to know thehabitat and distribution of MarsupialRats (Echymipera rufescens) on Wamar Island (Wangel Village, Durjela Village, Gunung Sembilan and Back of Wamar Village)Aru Island District. The method used for Marsupial Rats was the catching of wild animals and then the animals that have been capturedin the mark and back again, while for the catching of Marsupial Rats was a tool used is a trap.Analysis of distribution of Marsupial Ratsusing Morista Index while to know the habitat of Marsupial Rats using Line Intercept (line transect) method and the printed path from the analysis to know the pattern of distributionused Morista Index. The result of the research showed that the awareness of the pattern analysis of the Marsupial Rats distribution to the four locations including Wangel Village, Durjela Village, Gunung Sembilan and Back of Wamar Village, from the pattern of horizontal distribution of Marsupial Rats that was the same as random with the index values were Wangel Village was 0.067, Durjela Village was 0.067, Gunung Sembilan village was 0,000, and Back of Wamar village was 0,000. So the pattern of distribution on Wamar Island was random with index value of 0.079. Habitat from the Marsupial Rats own were secondary dryland forest and mixed with shrubs which was his habitat while the feed frm the Marsupial Rats was Galoba, Calladium, Sweet Potato, and Bananas.

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