The biodiversity richness of Mollusk species in Lanaga waters, Meureubo Subdistrict, Aceh Barat Regency, Aceh Province

Mollusca are soft-bodied animals that are generally protected by shells, and have a variety of species richness in habitat, especially in Lanaga Waters, Mereubo Subdistrict, Aceh Barat Regency and need to be studied through research. The research objectives were (1) to assess the number of species of each class, and (2) to analyse the level of species richness of each class of molluscs, which are found in Lanaga Waters, Meureubo Sub-district, Aceh Barat district, Aceh Province. The research was carried out from January to March 2021, in Lanaga Waters. The research area was divided into three locations, each location was divided into five stations, and each station was assigned five sampling plots. Data were taken by using the purposive sampling technique. Data analysis of species richness level was analysed by richness formula, and analysis of data about the number of each species in each class was carried out descriptively. The results showed that (1) the species of Molluscs belonging to the Gastropod class were 9 species with a richness index, the Bivalvia class contained 2 species with a species richness index of 0.13 to 0.90 indicating that the level of species richness was low to high, in the Lanaga Waters area. Mereubo Subdistrict, Aceh Barat Regency, Aceh Province.

Variations in Vegetation and Nutrient Composition in Sal and Eucalyptus Stands: A Case Study of Bhagabatichak Forest Area, West Bengal, India

The study was conducted on two type of stands one was coppice sal (Shorea robusta Gaertn. F.) stand (CSS) managed by Forest Protection Committee (FPC) along with the State Forest Department and other was coppice eucalyptus (Eucalyptus tereticornis Sm.) stand (CES) solely managed by the State Forest Department. These two stands are in the Bhagabatichak forest area under Midnapore East Forest Division, West Bengal, India. In this study Importance Value Index (IVI), biomass, species diversity index (H/), concentration of dominance(Cd), species richness index(d), beta diversity(βd), index of similarity (IS), nutrient composition and soil pH of the two stands were measured. The study reveals that the highest numbers of species were available during monsoon period in both the stands; these were 71 and 43 respectively in CSS and CES. The result also shows that the highest IVI was occupied by sal in CSS and eucalyptus in CES in all the seasons. Other major species were Clerodendrum viscosum Vent, Lantana camara L., Combretum roxburghii Spreng. Highest diversity index (H/) was in CSS during monsoon (1.983) and minimum in CES during pre-monsoon (1.274). So, the species richness index (d) was higher in CSS during monsoon (28.259) and lower in CES during pre-monsoon (12.112).Cd shows the opposite trend, it was higher in CES during pre-monsoon (0.125) and lower in CSS during monsoon (0.042). β diversity reflects the rate of species change, which was highest in CSS during post-monsoon (1.300). The similarity index (IS) between the two stands was 64.91%. The total annual above ground biomass (agb) were 87008.043 kg ha-1 yr-1 in CSS and 86309.837 kg ha-1 yr-1 in CES. Among them major contributors were sal (82357.946 kg ha-1 yr-1) in CSS and eucalyptus (84246.358 kg ha-1 yr-1) in CES. In both the stands higher amount of nutrients were available in Combretum roxburghii. In CSS available NPK were 1.272%, 0.527% and 1.867% respectively in Combretum roxburghii. In CES the values were 0.864%, 0.513% and 1.724% respectively for the same species. Soil pH of CSS were 5.53 in top soil and 5.79 in subsoil, in CES soil pH were 4.88 and 5.02 in top soil and subsoil respectively. It was observed that sal stand was better than eucalyptus stand with respect to ecology and biodiversity.

IMPACT OF THARTHAR ARM WATER ON COMPOSITION AND DIVERSITY OF COPEPODA IN TIGRIS RIVER, NORTH OF BAGHDAD CITY, IRAQ

This study is considered to be the first on this sector of Tigris River after 2003, to evaluate the effect of Tharthar Arm on the composition and diversity of Copepoda in Tigris River. Six sampling sites were selected; two on the Tharthar Arm and four sites along the Tigris River, one before the confluence as a control site and the others downstream the confluence; thirty-five copepod taxa were recorded, 34 taxa in the Tigris River and 25 taxa in the Tharthar Arm. The highest density of Copepoda was 265584.2 Ind./m3 in the site 2 at Tharthar Arm lead to an increasing in Copepoda density in the Tigris River from 63878.2 Ind./m3 in site 1 before the confluence to 127198.3 Ind./m3 in site 4 immediately downstream the confluence. Also, the mean values of richness index and diversity index increased from 1.71 and 0.98 bit/Ind. in site 1 before the confluence to 2.08 and 1.00 bit/Ind. in site 4 below the confluence, respectively. Moreover, the highest similarity percentage was between sites 3 and 4 reached 87.83% while, the lowest percentage was between the sites 1 and 2 recorded 65.41%. For constancy index the highest value was 9 at the site 6 whereas the lowest value was 2 at site3.

Song Richness Index: A measure to understand the diversity and repetition of notes in a birdsong

Birdsong plays an important role in mate attraction and territorial defense. Many birds, especially Passerines, produce varying sequences of multiple notes resulting in complex songs. Studying the diversity of notes within these songs can give insights into an individuals reproductive fitness. We first looked at the previously described and commonly used diversity measures to understand the possible case-specific limitations. We then developed a new diversity measure- Song Richness Index (SRI). We compared SRI with three measures of diversity using all possible combinations of notes to understand the case-specific advantages and limitations of all approaches. Simulating all possible combinations gave us insights into how each diversity measure works in a real scenario. SRI showed an advantage over conventional measures of diversity like Note Diversity Index (NDI), Shannons Equitability (SH), and Simpsons Diversity (SI), especially in the cases where songs are made up of only one type of repetitive note.

Combined application of animal manure and straw benefit soil fauna community in dryland farming

Addition of organic wastes such as animal manures and straw is a feasible practice to alleviate soil degradation, and the mitigation is closely related to the activities of soil-dwelling fauna. In this study, the community structure of soil fauna were compared under four treatment regimes: straw only, and straw combined with the use of chicken manure, ox manure and pig manure. A total of 12459 soil fauna were captured, belonging to 23 groups. Treatments animal manure combined with straw led to increased the number of soil fauna groups and individuals, diversity index, richness index and dominance index, while reduced the evenness index of soil fauna. Compared to the other treatments, maize straw plus chicken manure and maize straw plus pig manure treatments had the largest number of soil fauna groups. Among all the treatments, Oribatida, Astigmata, Desoria and Folsomia were the dominant species, accounting for 69.94 % of the total number of individuals. Maize straw plus pig manure treatment had the largest diversity index soil fauna community. The richness index of soil fauna community in maize straw plus chicken manure and maize straw plus pig manure treatments were higher compared to other treatments. The highest dominance index of soil fauna was recorded in maize straw plus ox manure treatment. In conclusion, our findings suggested that animal manure combined with straw, especially the application of maize straw plus pig manure was the most effective treatment for enhancing soil fauna community.

Karakteristik Agroforestri Kebun Campuran di Kapanewon Patuk Kabupaten Gunungkidul

Selama beberapa dekade terakhir, agroforestri menjadi solusi atas minimnya ketersediaan lahan di berbagai wilayah di Indonesia, termasuk di Kecamatan Patuk dengan pola kebun campur. Penelitian ini bertujuan untuk mengetahui struktur dan komposisi vegetasi pada agroforestri kebun campuran. Penelitian dilaksanakan di Kapanewon Pathuk, Kabupaten Gunungkidul, Provinsi Daerah Istimewa Yogyakarta, Indonesia pada bulan Juni – Agustus 2020. Pengambilan sampel dilakukan dengan metode purposive sampling dengan tiga kategori luas lahan yaitu sempit (<500 m2), sedang (500-1000 m2), dan besar (>1000 m2). Pengumpulan data dilakukan dengan metode sensus pada semua tahapan kehidupan pohon kemudian dianalisis dengan menghitung nilai indek penting (INP) dan Margalef Richness Index (R). Struktur pohon divisualisasikan menggunakan SexI-FS software. Hasil penelitian menunjukkan bahwa agroforestri kebun campuran di Kapanewon Patuk terdiri dari tanaman penghasil kayu, jenis pohon serbaguna, dan tanaman semusim. Kebun campuran di tiga kategori lahan masing-masing terdiri dari 23, 25, dan 21 jenis pohon. Durian, mahoni, dan sonokeling mendominasi semua kategori lahan.

PEMANFAATAN TANAMAN REFUGIA MENGENDALIKAN HAMA PADI (Oryza nivara L) DI SOPORARU TAPANULI UTARA

The refugia plant is one of the flowers that can be used as a shelter for natural enemies and as a feed sources for insects. The purpose of this study was to compare the use of refugia and without refugia plants in controlling environmentally friendly red rice pests in Soporaru Hamlet, Sigotom JuluVilalge, Pangaribuan District, North of Tapanuli Regency, North of Sumatra Province. This study uses a purposive sampling method with 3 types of traps, namely: yellow traps, fall traps and net traps. The samples was identified in the Plant Disease Laboratory, Faculty of Agriculture, University of North Sumatra in July 2020 until February 2021. The results showed that 8 orders of refugia were caught on land using refugia, 23 families, and 1,952 individuals, while on land without refugia there were 8 orders, 22 families and 1,807 individuals. On land using refugia (r) compared to land without refugia (k) it is known that the Species Richness Index (R) (Rr=2.9 and Rk=2.8), Diversity Index (H) (Hr=2.67 and Hk= 2.19), and Evenness Index (E) (Er=0.85 and Ek=0.71). Function status identified on land using refugia and without refugia as many as 5 species, namely herbivores, pollinators, predators, parasitoids and scavengers.

PERAN REFUGIA SEBAGAI MEDIA KONSERVASI ARTHROPODA DI LAHAN PADI DESA DELIKSUMBER

Rice is basic neet for Indonesia people. East Java experienced decrease rice production 2% in 2014, the problem was insect pest. Insecticides are dangerous that replaced use refugia attracting biological agens. Purpose of the research to discover the role of refugia as conservation medium in suppressing pets attacks and increasing the diversity arthropod populations in rice fields. This study uses a direct insect sampling method and uses traps such as sweep nets, yellow traps, pitfall traps and light traps. Identification of insects using an introduction to the study insect and iNaturalist. Analysis of the observational data quantitatively by calculating the species diversity index (H’), evenness index (E), Richness index (R) and dominance index (C) then tabulated using excel. observations indicate the number of insects found on land A (rice with refugia) was 5661 individuals consisting of 12 ordo, 61 family and 94 species. Meanwhile on land B (rice without refugia) was 3,198 individuals consisting of 11 ordo, 43 family and 56 species. Refugia affected the population of biological agens more on land A was 2707 individuals than on land B was 1215 individuals. While the pest population on land A much less as 364 individuals than on land B as 763 individuals. Tabulation from the calculation of the species diversity index as 0.142 and 0.118, the species evenness index as 0.030 and 0.025, the dominance index of 0.0004 and 0.0013 is classified as low, while the species richness index of 10.76 and 6.82 is classified as high.

Identification of insects associated with ebony (Diospyros celebica Bakh.) as an endemic tree to Sulawesi

The population of ebony trees in Sulawesi has decreased and has been included in Appendix II Cites, which means it can only be traded based on quotas. Insect studies on ebony stands are still limited, especially in South Sulawesi. This study aims to determine the diversity and association of ebony with insects found in ebony stands in the Hasanuddin University Education Forest, Maros Regency. This activity was carried out in June 2021. Sampling was carried out using the light trap method for winged insects with nocturnal activity and pitfall traps for insects crawling on the ground. Data analysis to determine the diversity of insect species was carried out using the Shannon-Wiener (H') species and the Margalef index. The results showed that the insects found were 8 orders, 20 families, and 28 species from 128 individuals. Based on analysis of their functional role, the insect complexes consist of 34% herbivores, 50% predators, 8% parasitoids, 14% detritivores and 2% transient species. The diversity of species was classified as moderate, namely 2.71, while the richness index value of 5.56, which was classified as high richness in Ebony Stands.

Benthic Meiofaunal Diversity in Four Zones of Pichavaram Mangrove Forest, India

ABSTRACT The community structure of meiofauna was assessed relative to environmental parameters in four zones (non-mangrove, Avicennia zone, mixed zone, and Rhizophora zone) of Pichavaram Mangrove Forest, which is located along the southeast coast of India. Field sampling was carried out from June 2016–May 2017. The meiofaunal data were evaluated using univariate and multivariate statistics. The highest abundance of meiofauna (434 ind/10 cm−2) was recorded in the Rhizophora zone and the lowest (270 ind/10 cm−2) in the non-mangrove zone. A total of 62 species representing four meiofaunal groups were recorded, including 38 species of foraminifera, 12 species of nematodes, seven species of ostracods, and five species of harpacticoids. Diversity (Shannon H′) mostly ranged from 3–4, and was highest (3.86±0.26) in the Avicennia zone and averaged ∼3.3 in the other three zones. The Margalef richness index was ∼6 in the Avicennia and Rhizophora zones and ∼5 in the non-mangrove and mixed zones. The BIO-ENV and CCA analyses identified sediment texture and organic matter as key variables influencing the distribution of meiofauna, while % calcium carbonate, salinity, and sediment pH were also important. Monitoring studies of meiofaunal taxa may help elucidate their roles in coastal blue-carbon cycling and will also contribute to understanding how mangrove-associated habitats influence meiofaunal distributions.