scholarly journals Diversity, Distribution Pattern, Morphometric of Box Mussel Septifer bilocularis (Linnaeus, 1758) on the Reef Flat in Cape Lampangi, South Minahasa

2014 ◽  
Vol 2 (1) ◽  
pp. 8 ◽  
Author(s):  
Grace Mustamu ◽  
Lawrence J. L Lumingas ◽  
Anneke V. Lohoo
Keyword(s):  
Intertidal Zone ◽  
Reef Flat ◽  
Sampling Method ◽  
Distribution Patterns ◽  
Average Density ◽  
Suspension Feeder ◽  
Total Weight ◽  
Dead Coral ◽  
Weight Index ◽  
Maximum Shell Length

Septifer bilocularis (Linnaeus, 1758) is a suspension feeder organisms which are found live clustered on dead coral . This study aims to estimate the average density, analyzes the distribution patterns and analyze morphometric aspects of a long-high (thick) relation, length-total weight relation and length-weight index without shell  relation of S. bilocularis at that location. Sampling method using transect squares method, with the length of each line is 50m, on each transect placed 10 squares (measuring 1m x 1m). Based on the data analysis of the average density in both transect was 214 individuals with a clustered deployment pattern, with a maximum shell length of 29,64mm. The relation between length and high of shell shows that the growth is allometri negative, length and total weight shell relationships is allometri negative, where the contents of the weight index does not increase with increasing length but declined. Box mussel Septifier bilocularis live clustered with very dense aggregations in intertidal reef flat area on the intertidal zone are exposed at the lowest tide at Cape Lampangi.   Keywords : box mussel, morphometric, Cape Lampangi, South Minahasa   ABSTRAK Septifer bilocularis (Linnaeus, 1758) merupakan organisme pemakan suspensi yang banyak ditemukan hidup secara mengelompok pada rataan terumbu karang mati. Penelitian ini bertujuan untuk menduga kepadatan rata-rata, menganalisis indeks dispersi atau pola sebaran dan menganalisis aspek morfometrik berupa hubungan panjang-tinggi (tebal), panjang-berat dan panjang-indeks berat tubuh tanpa cangkang dari S. bilocularis di lokasi tersebut. Pengambilan sampel menggunakan metode transek kuadrat, dengan panjang setiap garis 50 meter, pada masing-masing transek diletakkan 10 kuadrat (berukuran 1m x 1m). Berdasarkan analisis data kepadatan rata-rata secara keseluruhan (kedua transek) adalah 214 individu dengan pola penyebaran mengelompok, dengan panjang cangkang maksimum 29,64mm. Hubungan pertumbuhan panjang dan tinggi cangkang ‘allometri negatif’, hubungan panjang cangkang dan berat total ‘allometri negatif’, di mana pertambahan indeks isi tidak sejalan dengan pertambahan panjang tetapi menurun. Kerang kotak Septifier bilocularis hidup mengelompok dengan agregasi yang sangat padat di daerah intertidal rataan terumbu pada zona intertidal yang terekspos pada saat surut terendah di Tanjung Lampangi.   Kata kunci : karang kotak, morfometrik, Tanjung Lampangi, Minahasa Selatan

scholarly journals POPULATION DENSITY AND DISTRIBUTION PATTERNS OF KALAMBODO MUSSEL (Anodonta woodiana) IN THE SUB WATERSHED OF LAHOMBUTI RIVER, LAHOTUTU VILLAGE, KONAWE DISTRICT SOUTH EAST SULAWESI

AQUASAINS ◽  
2017 ◽  
Vol 8 (1) ◽  
pp. 759
Author(s):  
Muhammad Fajar Purnama ◽  
Abdullah Abdullah ◽  
Alfi Kusuma Admaja ◽  
La Ode Alirman Afu
Keyword(s):  
Population Density ◽  
Random Sampling ◽  
Sampling Method ◽  
Rice Field ◽  
Distribution Patterns ◽  
Average Density ◽  
Sampling Location ◽  
Channel Diameter ◽  
Irrigation Channel ◽  
Anodonta Woodiana

Abstrak The research was conducted in November 2018 - February 2019 in the Sub-watershed of the Lahombuti River in Lahotutu Village, Konawe Regency. The purpose of this study was to determine aspects of population density and distribution patterns of the Kalambodo (A. woodiana) in the Sub watershed of the Lahombuti tributary in Lahotutu Village, Wonggeduku District, Konawe Regency. The sampling location was determined using the purposive random sampling method. Sampling of Kalambodo (A. woodiana) was carried out at the location with the greatest abundance of A. woodiana, in the Sub watershed of the Lahombuti tributary of Lahotutu Village, on the "Main Rice Field Irrigation Channel" (diameter: ± 1,75 m, length: ± 4500 m, depth: ± 110 cm). Sampling of A. Woodiana was carried out at the same station with different spot sampling points. The Kalambodo samples were taken using a 1x1 m2 sized transect on 3 randomly assigned plots. The range of A. woodiana density per sub station is November 2018 amounting to 67-95 ind/m2, December 2018 is 41-61 ind/m2, January 2019 is 41-148 ind/m2 and February 2019 is 101- 114 ind/m2. The average density based on the period from the highest to the lowest is obtained in February 2019, January 2019, November 2018, and December 2018, which is 106.67 ind/m2, 81.33 ind/m2, 78 ind/m2, and 53 ind/m2, respectively. The distribution pattern of A. woodiana in the Sub-watershed of the Lahombuti River Basin generally shows a uniform category (Id <1), with a range of morisitha index values of 0.65-0.87.

scholarly journals Population structure of Lingula (Bruguière, 1791) in Alue Naga waters, Banda Aceh City, Indonesia

DEPIK ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 201-206
Author(s):  
Chitra Octavina ◽  
Maria Ulfah ◽  
Sri Agustina ◽  
Haekal Azief Haridhi ◽  
Ade Yudistira
Keyword(s):  
Population Structure ◽  
Intertidal Zone ◽  
Sampling Method ◽  
Distribution Patterns ◽  
Chemical Parameters ◽  
Normal Limits ◽  
Structure Density ◽  
Morisita Index ◽  
Physical And Chemical ◽  
Banda Aceh

Lingula sp. is one of the genera of the Brachiopoda phylum that lives in the intertidal zone or areas that are affected by tides. The purpose of this study was to determine the population structure of Lingula sp. through the approach of population structure, density, distribution patterns, length and weight relationship and with physical and chemical parameters in the waters of Alue Naga, Syiah Kuala District, Banda Aceh City. The method used in this research is a purposive random sampling method. The results show that the growth pattern of Lingula sp. is classified as negative allometric at three research sites in Alue Naga waters, based on the value of b 3. The density of Lingula sp. was the highest at site 1 with a total of 17.7 ind/m2. While the density of Lingula sp. was the lowest at site 3 with a total of 9.7 ind/m2. The distribution of Lingula sp. at the three sites were uniform, with morisita index (Id) values of 0.352, 0.257, and 0.208 for sites 1, 2, and 3 respectively. In addition, the environmental factors of the three research sites in Alue Naga waters are within the normal limits of life for Lingula sp.Keywords: Alue NagaLingula sp. Population structure

ABOUT IMPROVEMENT OF SETS OF REPLACEABLE GEARS GUITARS METAL CUTTING MACHINES

2021 ◽  
pp. 21-25
Author(s):  
A. P. Fot
Keyword(s):  
Quality Index ◽  
Metal Cutting ◽  
Average Density ◽  
Performance Characteristics ◽  
Total Weight ◽  
Computational Experiments ◽  
Resource Saving ◽  
Complex Products ◽  
Integral Quality ◽  
Practical Recommendations

The article is devoted to the problems of modernization of the existing fleet of metal-cutting machines. The purpose and objectives-to determine ways and practical recommendations for resource saving in the production of machine components for the manufacture of complex products. The methods used are comparative computational experiments to determine the performance characteristics of sets of replaceable gears. The presented material contains practical recommendations on the choice of evaluation indicators and improvement of sets of replaceable gears of two-pair guitars of various gear-processing machines (5B12, 5A308P, 5111 and 5K32) based on the results of research. Confirmed the possibility of improving the characteristics of kits while maintaining the number of wheels in the kits. In conclusion, it is noted that the proposed solutions contribute to an increase in the integral quality index by 1,2857 – 6,3742 times, a decrease in the total weight of the wheels of the set by 1,4824 – 3,3093 times, an increase in the number of realized gear ratios by 1,2622 – 3,7525 times, an increase in the average density of the values of the gear ratios by 1,2136 – 3,7781 times.

scholarly journals Distribution and density of the mollusk Donax striatus (Linnaeus, 1767) in a tropical estuarine region in the brazilian semi-arid

2015 ◽  
Vol 75 (4) ◽  
pp. 914-922 ◽  
Author(s):  
E. L. Medeiros ◽  
G. V. Fernandes ◽  
G. G. Henry-Silva
Keyword(s):  
Intertidal Zone ◽  
Significant Positive Correlation ◽  
River Estuary ◽  
Temporal Distribution ◽  
Average Density ◽  
Spatial And Temporal Distribution ◽  
Tropical Estuarine ◽  
Sampling Points ◽  
Estuarine Region ◽  
Semi Arid

Abstract This study evaluated the spatial and temporal distribution and density of the bivalve Donax striatus, at beaches close to the Apodi/Mossoró River estuary, through, six semiannual sampling campaigns were performed between April/2009 and October/2011. The sampled area was delimited by 20 transects that were laid perpendicular to the beach line and extended over 300 m in the intertidal zone. Seven sampling points were established in each transect, organisms and sediment were collected, and water temperature and salinity were recorded. The highest D. striatus average density (103 individuals.m–2) was observed in April/2009 and the lowest (18 individuals.m–2) in October/2010. The highest D. striatus densities occurred in beaches further from the estuarine region as demonstrated by a significant positive correlation (r2 = 0.67 and p = 0.0007). The D. striatus densities presented significant negative correlations with the percentages of organic matter in the water. This species demonstrated an aggregated distribution in the studied area.

scholarly journals BIODIVERSITAS ECHINODERMATA BERDASARKAN TIPE HABITATNYA DI PANTAI INDRAYANTI, GUNUNGKIDUL, YOGYAKARTA (BIODIVERSITY ECHINODERMS BASED ON HABITAT TYPE IN INDRAYANTI BEACH, GUNUNG KIDUL, YOGYAKARTA)

2018 ◽  
Vol 6 (4) ◽  
pp. 409-414
Author(s):  
Patric Erico Rakandika Nugroho ◽  
Pudjiono Wahyu Purnomo ◽  
Suryanti Suryanti
Keyword(s):  
Intertidal Zone ◽  
Sea Urchins ◽  
Habitat Type ◽  
Dead Coral ◽  
Sampling Points ◽  
Shell Fragment ◽  
Echinometra Mathaei

Pantai Indrayanti merupakan salah satu pantai berbatu yang ada di kabupaten Gunungkidul. Pantai Indrayanti memiliki biodiversitas flora dan fauna yang cukup tinggi, hal ini dilihat dari banyaknya makhluk hidup khas pantai berbatu yang menghuni wilayah ini. Kebanyakan Echinodermata ditemukan pada tempat-tempat tertentu atau mempunyai zonasi. Hal tersebut diduga berhubungan dengan vegetasi atau rumput laut yang telah tumbuh di daerah tersebut. Adanya pasang surut yang jelas juga diduga menjadi penyebab lain terjadinya zonasi tersebut. Penelitian ini bertujuan untuk menjawab pertanyaan bagaimana zonasi Echinodermata pada zona intertidal di Pantai Indrayanti. Penelitian dilaksanakan pada Maret 2017 di kawasan perairan Pantai Indrayanti. Lokasi penelitian sendiri berada di Pantai Indrayanti yang kemudian dibagi menjadi tiga stasiun antara lain stasiun 1 sebagai daerah dengan tipe habitat karang mati , stasiun 2 sebagai daerah dengan tipe habitat pecahan karang dan pasir kemudian stasiun 3 sebagai daerah dengan tipe habitat karang mati, lamun dan pasir. Masing-masing stasiun yang telah dipilih kemudian dibagi menjadi tiga titik sampling yang nantinya digunakan sebagai titik pengambilan sampel. Pada lokasi penelitian di temukan sebanyak 2 jenis Echinodermata yaitu bulu babi dan bintang mengular. Spesies bulu babi yang ditemukan ada 3 jenis yaitu Stomopneustes sp, Echinometra sp, dan Echinometra mathaei. Spesies bintang mengular yang ditemukan ada 2 jenis yaitu Ophiocoma erinaceus dan Ophiocoma scolopendrina. Stasiun 1 dan 2 dengan daerah tipe habitat karang mati dan pecahan kerang beserta pasir paling banyak ditemukan Echinodermata dibandingkan dengan stasiun 3 dengan tipe habitat pecahan karang mati, lamun, dan pasir. Indrayanti Beach is one of the rocky beaches in Gunungkidul district. Indrayanti beach has a biodiversity of flora and fauna is quite high, it is seen from the number of living creatures typical of rocky beaches that inhabit this region. Most Echinoderms are found in certain places or have zoning. It is thought to be related to vegetation or seaweed that has grown in the area. The presence of a clear tidal is also suspected to be another cause of the occurrence of the zonation. This study aims to answer the question of how the zonation of Echinodermata in the intertidal zone at Indrayanti Beach. The research was conducted in March 2017 in Indrayanti Beach waters area. The research location itself is located at Indrayanti Beach which is then divided into three stations such as station 1 as area with dead coral habitat type, station 2 as area with habitat type of broken coral and sand then station 3 as area with dead coral habitat type, seagrass and sand . Each selected station is then divided into three sampling points which will be used as sampling points. At the location of the study found as many as two types of echinoderms, which are sea urchins and snake stars. Species of pigs found there are 3 types of Stomopneustes sp, Echinometra sp, and Echinometra mathaei. Infectious star species found there are 2 types of Ophiocoma erinaceus and Ophiocoma scolopendrina. Station 1 and 2 with dead coral habitat type and shell fragment with sand found most Echinodermata compared with station 3 with habitat type of dead corals, seagrass, and sand.

Recruitment of the limpet Patella ulyssiponensis and its relationship with crustose coralline algae: patterns of juvenile distribution and larval settlement

2019 ◽  
Vol 99 (8) ◽  
pp. 1787-1796 ◽  
Author(s):  
M. I. Seabra ◽  
T. Cruz ◽  
J. N. Fernandes ◽  
T. Silva ◽  
S. J. Hawkins
Keyword(s):  
Intertidal Zone ◽  
Larval Settlement ◽  
Coralline Algae ◽  
Rock Pools ◽  
Crustose Coralline Algae ◽  
Bare Rock ◽  
Naturally Occurring ◽  
Patella Ulyssiponensis ◽  
Maximum Shell Length ◽  
Sw Portugal

AbstractRecruitment of the limpet Patella ulyssiponensis was investigated in relation to the presence of living crustose coralline algae (CCA) in rocky-shore habitats. Juvenile limpets (≤10 mm maximum shell length) were counted in CCA-present and CCA-absent habitats, on three shores in SW Portugal during summer 2007 and winter 2009. Furthermore, the settling response of laboratory-reared larvae of P. ulyssiponensis to CCA-covered substratum, and bare-rock, was examined. Across the intertidal zone, we found a clear association between the distribution and abundance of juveniles and the presence of CCA. Although the presence of CCA was not an absolute requisite for juvenile occurrence, null juvenile densities were mostly recorded in CCA-absent areas. The highest juvenile densities (maximum of 64 individuals in 15 × 15 cm) were consistently found in CCA-dominated habitats, namely steep wave-exposed areas at low-shore and rock-pools. The hypothesis of CCA-enhanced settlement was not supported, as settlement intensities of laboratory-reared larvae were similar between chips of rock encrusted by CCA and chips of bare-rock. From the overall number of settlers onto CCA-encrusted rock chips, 51% were found in tiny pits lacking CCA. This was the first study of the settlement patterns of larvae of the genus Patella using naturally occurring rocky substrata. These results are preliminary and should be confirmed with choice-experiments and improved monitoring of the position of settlers. We suggest that CCA plays a role in the recruitment of P. ulyssiponensis, potentially promoting survivorship of early benthic stages, but possibly not enhancing settlement.

Detecting Alaria esculenta and Laminaria digitata (Laminariales, Phaeophyceae) gametophytes in red algae, with consideration of distribution patterns in the intertidal zone

Phycologia ◽  
2018 ◽  
Vol 57 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Trevor T. Bringloe ◽  
Charlotte A.B. Bartlett ◽  
Emma S. Bergeron ◽  
Katherine S.A. Cripps ◽  
Nicole J. Daigle ◽  
...  
Keyword(s):  
Red Algae ◽  
Intertidal Zone ◽  
Distribution Patterns ◽  
Laminaria Digitata ◽  
Alaria Esculenta

scholarly journals Community Structure of Ascidian in Mike’s Point Bunaken Waters, Manado City, North Sulawesi Province

2020 ◽  
Vol 8 (1) ◽  
pp. 61
Author(s):  
Samuel L. Opa ◽  
Deiske A. Sumilat ◽  
Silvester B. Pratasik ◽  
Billy Th. Wagey ◽  
Gustaf F. Mamangkey ◽  
...  
Keyword(s):  
Distribution Pattern ◽  
Marine Invertebrates ◽  
Diversity Index ◽  
Marine Ecosystem ◽  
Distribution Patterns ◽  
Average Density ◽  
Ecological Index ◽  
North Sulawesi ◽  
Belt Transect ◽  
The Stability

Ascidians are marine invertebrates that have been classified with the subphylum Urochordata (Tunicata). These organisms are very important because they contribute a lot to the stability of the marine ecosystem. This study aims to determine the species composition, density, ecological index (diversity, uniformity, dominance), distribution patterns, and substrate occupied by Ascidian. Data were collected at Mike’s Point Bunaken waters at two depths 7 m and 14 m. The method used a direct observation along the 50 m and 2 m width belt transect. In this study, the transect was applied parallel to the coastline at each depth, where 3 replications were performed. The results show  26 species consisting of 13 species at a depth of 7 m and 22 species at a depth of 14 m were identified. The average density of each species was  0.05 ind/m2 at both depths. Diversity Index of 1.76 at 7 m depth and 2.24 at 14 m depth was determined. Uniformity Index was 0.68 at 7 m depth and 0.73 at 14 m depth. Dominant Index of 0.67 at 7 m depth and 0.88 at 14 m depth was also determined. The distribution pattern of species was dominated by uniform distribution, and the substrate most commonly occupied by Ascidianns was dead coral overgrown with algae.Keywords: Ascidian, composition and density, ecological index, distribution pattern, substrate  AbstrakAscidian adalah Avertebrata laut yang termasuk dalam subfilum Urochordata (Tunicata). Organisme ini sangat penting karena mereka banyak berkontribusi pada stabilitas ekosistem laut. Penelitian ini bertujuan untuk menentukan komposisi spesies, kepadatan, indeks ekologi (keanekaragaman, keseragaman, dominasi), pola distribusi, dan substrat yang ditempati oleh Ascidian. Data dikumpulkan di Perairan Mike's Point Bunaken pada dua kedalaman 7 m dan 14 m. Metode yang digunakan adalah pengamatan langsung sepanjang transek sabuk 50 m dan lebar 2 m. Transek dipasang sejajar dengan garis pantai dan pada setiap kedalaman.  Pengambilan data  dilakukan 3 ulangan. Hasil dari penelitian ini adalah  ditemukan  26 spesies yang terdiri dari 13 spesies pada kedalaman 7 m dan 22 spesies pada kedalaman 14 m. Kepadatan total Ascidian pada kedalaman 7 m (0,67 ind/m2) dan pada kedalaman 14 m (1.11 ind/m2). Indeks Keanekaragaman adalah 1,76 pada kedalaman 7 m dan 2,24 pada kedalaman 14 m. Indeks Keseragaman adalah 0,68 pada kedalaman 7 m dan 0,73 pada kedalaman 14 m. Indeks Dominansi 0,67 pada kedalaman 7 m dan 0,88 pada kedalaman 14 m. Pola distribusi spesies didominasi oleh pola distribusi yang seragam, dan substrat yang paling umum ditempati oleh Ascidian adalah karang mati yang ditumbuhi alga.Kata Kunci: Ascidian, komposisi dan kepadatan, indeks ekologi, pola sebaran, substrat

scholarly journals HARD CORAL (SCLERACTINIA) RECRUITMENT BASED ON THE GEOMORPHOLOGY ZONE IN BINTAN ISLAND WATERS, RIAU ISLANDS

2021 ◽  
Vol 13 (2) ◽  
pp. 269-281
Author(s):  
Nurhasima ◽  
Aditya Hikmat Nugraha ◽  
Dedy Kurniawan
Keyword(s):  
Coral Reef ◽  
Reef Flat ◽  
Sampling Method ◽  
Life Form ◽  
T Test ◽  
Reef Slope ◽  
Hard Coral ◽  
Coral Recruitment ◽  
Line Parallel ◽  
Coral Reef Ecosystems

The health of coral reef ecosystems can be seen through the emergence of coral recruitment. Aim of this research was to compared the scleractinia coral recruitment list based on genus, life form, and variations in size of the scleractinia coral recuit in the waters of Kampung Baru Lagoi and Teluk Bakau Village, Bintan Regency by geomorfology zone. The research was conducted using a Purposive sampling method in consideration of the presence of scleractinia coral in reef flat and reef slope areas using a 1x1 m square frame mounted along a 70 m transverse line parallel to the shoreline. Research has found 164 colonies of 24 genus dominated by Favia and Favites. Based on the most extensive life form of Coral encrusting and Coral massive variations in size 4.5-6 cm or medium category. The results of t test showed that the geomorphological differences in the research locations did not have a significant impact on the abundance of corals recruitment

scholarly journals Biomassa Kerang Anadara granosa pada Perairan Pantai Kabupaten Indragiri Hilir

2012 ◽  
Vol 12 (1) ◽  
pp. 61
Author(s):  
Syafruddin Nasution
Keyword(s):  
Soft Tissue ◽  
Normal Condition ◽  
Coastal Waters ◽  
Intertidal Zone ◽  
Sampling Method ◽  
Dry Weight ◽  
Sampling Station ◽  
Wet Weight ◽  
Anadara Granosa

The present study was carried out to investigate the biomass of cockle (Anadara granosa) from coastal waters ofSouth Indragiri District, Riau Province. The biomass was investigated by quadrad sampling method in the intertidalarea along the Concong beach, where fishing of cockles mainly occured. The first station was near by the Concongestuary, while the second station was about 3 miles away from the fisrt one. Samples were collected from threedifferent portions of the intertidal zone that of High Intertidal Mid-Intertidal, and Low Intertidal. The result showedthat the highest biomass was found at the lower partion of the intertidal zone. Soft tissue of A. granosa was about24.8% of total wet-weight and 7.2 % of dry-weight. While material organic was about 85 % of soft tissue dry-weight.Water qualities of the sampling station showed that the overall water qualities were still in normal condition.

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