COMPARATIVE DATA ON MACROZOOBENTHOS COMMUNITY BETWEEN EASTERN AND WESTERN COASTS OF SAZANI ISLAND, ALBANIA

This paper is focused on analysing the difference in distribution, composition and abundance of benthic invertebrates' populations of the rocky coast of Sazan Island (south western Albania), between its eastern and western sides. This study was carried out during 2012-2014, sampling in shallow water. A total of 56 species of benthic macroinvertebrates were recorded. Species composition and their abundance were compared between the four sampling sites and between the two sampling seasons, spring and autumn. Degree of coast exposure and level of environmental impacts seem to be the main factors regarding the difference in species composition and quantitative characteristics of macrozoobenthic community between the eastern and western coasts of the island.

Komunitas makrozoobentos dan kaitannya dengan kualitas air aliran sungai Senggarang, Kota Tanjungpinang

Senggarang is one of the coastal villages in Tanjungpinang City which has a river that flows from the upstream downstream into the sea. The flow of the Senggarang river has distinctive characteristics that are commonly found in small island waters, namely having a relatively short upstream to downstream distance, and the downstream part is influenced by tidal conditions. Various activities along the Senggarang river flow would cause changes in water quality which would impact the presence of macrozoobenthic. The objective of this study was to determine the relationship between the macrozoobenthic community and the water quality of the Senggarang river. Macrozoobenthic sampling, and environmental parameters were carried out using random sampling methods. The results of this study were obtained 27 species from 6 phylum, namely phylum Arthropoda 13 species, phylum Ciliophora 3 species, phylum Echinodermata 1 species, phylum Mollusca 4 species, phylum Nematoda 5 species, and phylum Tardigrada 1 species. The average macrozoobenthic density is 172 ind./ m3 for freshwater and 704 ind./ m3 for brackish waters. The average diversity value for freshwater is 1.29 and 2.16 waters with medium salinity, the average uniformity value of 0.85 freshwater and 0.94 of high in brackish waters, the average dominance value of 0.32 freshwater and 0.13 of low in brackish waters. The relationship of macrozoobenthos with the quality of freshwater based on PCA analyses related to temperature and dissolved oxygen, in brackish waters to temperature, dissolved oxygen, and current.Keywords: Macrozoobenthic community, PCA, River flow, Water quality

Bioassessment of Batang Kandis River Water Quality Using Macrozoobenthos in Koto Tangah district, Padang City

This study was conducted from July to December 2019 which was aimed to determine the composition of macrozoobenthic community and to assess the water quality of the Batang Kandis river based on the BMWP ASPT index. A survey method was used in this study. The study site was determined by purposive sampling based on environmental condition which was divided into four stations. Macrozoobenthos samples were taken using a surber net (30 x 30 cm2). The physical and chemical factors of water condition were measured during sampling time. The results showed that 23 genera of macrozoobenthic communities were found in the Batang Kandis river which were consisted of two classes i.e., Hirudinea (1 order, 1 family, 1 genus) and Insect (7 orders, 14 families, 22 genera). These macrozoobenthic communities had an average density ranges from 220.00 - 706.67 ind. m-2 with the highest density was found at Station II and the lowest one at Station IV. Variation in the predominant genus was found at every station: Orthocladius and Elophila (station I); Polypedilum, Orthocladius, Elophila, and Hydropsyche (station II); Polypedylum, Macropelopia, and Caenis (station III); and Polypedylum, Orthocladius, and Caenis (station IV). The water quality of Batang Kandis river was classified into not polluted (station I, II and III) to slightly polluted (station IV) based on the BMWP-ASPT indexes.

Kondisi Makrozoobentos (Gastropoda dan Bivalvia) Pada Ekosistem Mangrove, Pulau Pari, Kepulauan Seribu, Jakarta

Makrozoobentos merupakan indikator biologi perairan, disamping sebagai organisme sesil mereka juga mempunyai daur hidup yang relatif lama. Klass Gastropoda dan Bivalvia secara umum mempunyai kelimpahan dan keanekaragaman yang tinggi, dan senantiasa merespon kondisi kualitas air di tempat hidupnya. Penelitian ini bertujuan menganalisis struktur komunitas makrozoobenthos dan hubungannya dengan ekosistem mangrove di Pulau Pari. Purposive random sampling digunakan pada pengambilan sample dengan melihat kerapatan dan jenis vegetasi mangrove. Square plot 10 x 10 and 5 x 5 m digunakan untuk menghitung kelimpahan mangrove dan makrozoobentos (gastropoda dan bivalvia), sementara identifikasi moluska dilakukan di Lab LIPI Cibinong. Hasil menunjukkan kelimpahan mangrove dari keempat stasiun berkisar 1,200–2,700 pohon/Ha, sementara kelimpahan molusca antara 5.500-55.600 ind/Ha, dengan komposisi makrozoobentos terdapat 10 spesies gastropoda dan 1 spesies bivalvia. Keanekaragaman kedua klass termasuk pada kategori sedang (1,20-2,67), dengan keseragaman sedang (0,59-0,84) dan indeks dominansi antara 0,20-0,47. Analisis regresi hubungan kelimpahan mangrove dan makrozoobentos menunjukkan nilai 0,6498. Hal ini dapat disimpulkan bahwa pada kawasan mangrove P. Pari tidak ada jenis gastropoda ataupun bivalvia yang mendominasi, namun hubungan keduanya mengikuti kerapatan mangrove yang ada dengan nilai korelasi keduanya sebesar 0,8061.Jenis yang lebih beragam dan kelimpahan jenisnya lebih dipengaruhi oleh kerapatan mangrove sebagai tempat hidupnya. Macrozoobethos as a biological indicators aside as a sessile organisms, its also have relatively long life cycle. Gastropod and bivalvia class, are commonly have a high abundance and diversity, its always responds to the water quality conditions in their habitat. The aim of study is to analized macrozoobenthic community structure and their relationship to mangrove ecosystem at Pari Island. Purposive random sampling was used for sampling the organisms by comparing to the density and species of mangrove vegetation. Square plots of 10 x 10 and 5 x 5 m were used to calculate macrozoobenthos abundance (gastropods and bivalvia) meanwhile the identification of Gastropods and Bivalvia is in LIPI laboratory at Cibinong. The results shows that mangrove density is in between 1,200 to 2,700 inds/Ha, while composition of macrozoobenthos at Pari Island have 10 species of gastropods and one species of bivalvia. The diversity of the two classes is included into the medium category (1.20-2.67), with moderate uniformity (0.59-0.84) and the dominance index is between 0.20-0.47. The regression analysis of the relationship between mangrove and macrozoobenthic abundance is about 0.6498. It can be concluded that in the Pari Island’s mangrove area, there are no gastropods or bivalves that much dominate, but the relationship between of Gastropoda and Bivalvia is following the mangrove density with a correlation about 0.8061. More diverse types and abundance of species are affected by the density of mangroves as a place for its live.

DIVERSITY AND POPULATION STRUCTURE OF MACROINVERTEBRATES IN THE GLACIER FED STREAM BALKHILA AT TILFARA FROM GARHWAL HIMALAYA

This paper deals with the study of macrozoobenthic community in the glacier fed stream Balkhila which is an important tributary of Alaknanda River. In this study it was found that the maximum macrozoobenthos were recorded in the month of February (387.5±106.5 units/m2 ) followed by January (382.2±144.7 units/m2 ) whereas, minimum in July (21.6±15.3 units/m2 ) and August (21.6±0.0 units/m2 ). The stream is represented by 15 genera belonging to 6 orders viz. Ephemeroptera (Baetis, Cinygmula, Caenis, and Heptagenia), Trichoptera (Glossosoma, Rhyachophila, Agapetus, Hydropsyche, Chimarra and Stenopsyche), Diptera (Antocha and Chironomus), Coleoptera (Psephenus), Odonata (Euphaea) and Plecoptera (Perla). The regression analysis and the correlation coefficient were used to show the relationship between macrozoobenthos and various physico-chemical parameters. The Shannon-Wiener diversity index was calculated to study the benthic diversity of the stream. In order to depict the homogeneity among different benthic orders, the multivariate cluster analysis was used. The Canonical correspondence analysis (CCA) was used to investigate the seasonal effect of detrimental ecological factors on benthic population.