Shannon-Wiener Diversity Index Research Articles

Dampak Konversi Hutan Menjadi Perkebunan Kelapa Sawit Terhadap Keanekaragaman dan Kelimpahan Kupu-kupu Superfamili Papilionoidea

The research was conducted in June to August 2022 in Ubiyau Village, Yanamaa Village and Yuwanain Village, Arso District, Keerom, Papua. The aim of the study was to determine the impact of forest conversion to oil palm plantations on the diversity and abundance of the Superfamily Papilionoidea butterfly. The line transect count method was used for sampling butterflies with a transect length of 1500 m at each study area. Sampling was carried out along a line transect in an imaginary box measuring 10 x 10 x 10 m which was carried out on sunny days from 09.00 am to 14.00 pm. The highest species diversity of the Superfamily Papilionoidea was found in Secondary Forest (HS), namely 70 species consisting of Papilionidae (8 species), Pieridae (5 species), Lycaenidae (21 species) and Nymphalidae (36 species). There were 42 species of butterflies recorded from Non-Productive Oil palm Plantations consisting of Papilionidae (5 species), Pieridae (4 species), Lycaenidae (11 species) and Nymphalidae (22 species). While the lowest number of butterfly species was encountered in Productive Oil Palm Plantations namely 32 species consisting of Papilionidae (5 species), Pieridae (3 species), Lycaenidae (8 species) and Nymphalidae (16 species). These data indicated that conversion of secondary forest to oil palm plantations reduced butterfly species by around 40-53%. The highest Shannon-Wiener Diversity Index (H') and Margalef Diversity Index (Dmg) values were found in secondary forest (H'=3.4; Dmg =13.7) followed by Non-Productive Oil Palm Plantations (H'=2.5; Dmg=7.2) and Productive Oil Palm Plantations (H=2.0; Dmg=6.1). The highest species similarity was between Secondary Forest and Productive Oil Palm Plantations with Sorensen Index value IS=60%, followed by Non-Productive Oil Palm Plantations and Productive Oil Palm Plantations (IS=51%) and the lowest species similarity index was between Secondary Forests and Non-Productive Oil Palm Plantations (IS = 46%). In Secondary Forest the composition of the number of individuals per species tends to be more evenly distributed compared to oil palm plantations. Forest conversion to Oil Palm Plantations has a negative impact on butterfly species diversity of the Superfamily Papilionoidea. The lost species that were not found in oil palm plantations were forest specialist species with small range sizes and niches as well as specific diets that were only found in forest. Key words: Papilionidae; primary forest; Pieridae; Nymphalidae; Lycaenidae; Keerom.

Terrestrial insect fauna of the herbaceous stratum of reservoir embankment slopes, Korea

Herbaceous strata with a dominant plant community 50 m in size were selected from 10 reservoir embankment areas in Shinan-gun, a southwestern island region of South Korea. Terrestrial insects were sampled 100 times with quantitative sweep sampling to investigate the insect fauna and their association with flora. The survey areas were mainly dominated either by Phragmites japonica or Miscanthus sinensis plant species. A total of 1,948 individual insects representing 173 species from 64 families within 9 orders were collected. The number of species was the highest at Jaeundo while the Shannon-Wiener diversity index was the highest at Saokdo. Similarity analysis showed that the insect species composition tended to be similar among survey sites with plant communities comprising the same dominant plant species. Species diversity was the highest in April while the number of individual insects was the highest in September. Petaphora maritima and Ochetellus glaber were the dominant and subdominant insect species, with a high frequency of occurrence at these sites. The results of this study could be applied towards biodiversity conservation and monitoring of reservoir embankment areas in the future.

The diversity and conservation status of snakes in the eastern part of PT GAN, Riau Province

PT Global Alam Nusantara (GAN) is one of ecosystem restoration concessions in Kampar Peninsula managed by Riau Ecosystem Restoration (RER). Unlike other companies under RER, information on the diversity of snake species in PT GAN is not yet available. Therefore, this study aims to determine the diversity and conservation status of snake species in PT GAN. There are 4 transects are placed systematically based on habitat conditions. Two transects are located near the river (transect 1 and transect 2), the other two transects are far from the river and are located around the peat dome (transect 3 and transect 4). Observations were made using the Visual Encounter Survey (VES) method on four observation transects. Data analysis used the Shannon-Wiener diversity index (H') and the Sorensen Index (IS). The snakes found were 16 individuals, belonging to three families and 11 species, namely: Ahaetulla prasina, Boiga jaspidae, Boiga cynodon, Boiga drapiezii, Coelognathus flavolineatus, Dendrelaphis caudolineatus, Dryocalamus subannulatus, Lycodon subcintus, Sibynophis melanochepalus, Tripodolaemus wagleri, and Calliophis bivirgatus. The diversity of snakes in PT GAN was moderate with a low Sorensen similarity index. All snake species found are unprotected, with low-risk IUCN status, and have not been included in the CITES appendix.

Weed infestation of soybean depending on the cultivar and row spacing under organic and conventional cultivation conditions

An experiment in growing soybean was conducted at the Czesławice Experimental Farm, belonging to the University of Life Sciences in Lublin, over the period 2018–2020. Three experimental factors were included in this study: cultivation method (conventional and organic), soybean cultivar (Aldana and Merlin), and row spacing (22.5 cm and 35 cm). The species composition, number, and air-dry weight of weeds were evaluated. The Shannon-Wiener diversity index (H’) and the Simpson dominance index (SI) were also calculated for the weed community in the soybean crop. Compared to conventional farming, organic cultivation significantly increased the number and dry weight of weeds as well as the numbers of the dominant species Echinochloa crus-galli. A significantly higher number and dry weight of weeds were found in the cv. Aldana crop than in the case of Merlin. In comparison with narrow-row cultivation, sowing soybean at the wider row spacing resulted in a greater number of weeds, in particular of the species Echinochloa crus-galli. Interrow width in the soybean crop did not cause differences in weed dry weight. The experimental factors slightly modified the Shannon-Wiener (H’) and Simpson (SI) indices.

Taxonomic diversity of the macrobenthos and its relationship with environmental factors in the Huanghe River (Yellow River) estuary and adjacent seas, China

Data on the macrobenthos, bottom seawater, and sediment from 26 sampling stations in the Huanghe River estuary and adjacent seas in China, were collected in June 2020. Community structure, species diversity, taxonomic diversity of the macrobenthos, and the relationships of these variables with environmental factors were analyzed. The funnels and contours of average taxonomic distinctness (Δ+) and variation in taxonomic distinctness (Λ+) were used to indicate the disturbance status of the estuary seas. These findings revealed differences in macrobenthic community structure and biodiversity between the estuary and the adjacent seas. A total of 88 macrobenthic species were collected in the Huanghe River estuary and its adjacent seas. Abundances in the estuary, Section C, and Section D were 60 ind. m−2, 183 ind. m−2, and 320 ind. m−2, respectively, The biomass in the estuary, Section C, and Section D was 6.74 g·m−2, 15.72 g·m−2, and 9.07 g·m−2, respectively. There were significant differences in the number of species and their abundances between the estuary and adjacent seas (p < 0.01). Glycinde bonhourei, Sternaspis scutata, Moerella hilaris, Liljeborgia serrata, Iphinoe tenera, and Lineus sp. were the dominant species. The community dissimilarity of the estuary and adjacent seas reached >79.66% (p = 0.001). The results of k-means clustering analysis showed that the macrobenthic community could be divided into three types. High Margalef richness index (d) and Shannon–Wiener diversity index (H′) values were observed in the northern portion of the estuary and the seas in Laizhou Bay. The theoretical mean values of Δ+ and Λ+ were 90.8 and 267.7, respectively. High values of Δ+ were observed in Section A2-B2-C2-D2 where the communities were distantly related. Low values were observed in Laizhou Bay. The distribution of Λ+ was the complete opposite of that of Δ+. Deviations in the 95% confidence interval were observed at five stations (A2, A3, B1, B2, and D2). The northern sea of the Huanghe River estuary was disturbed. Spearman correlation analysis showed that ∆ was positively correlated with total organic carbon, heavy metals, fine silt, and clay. Heavy metal and TOC in the Huanghe River estuary and adjacent seas may be positively correlated with the reproduction of opportunistic species.

Natural restoration alters soil microbial community structure, but has contrasting effects on the diversity of bacterial and fungal assemblages in salinized grasslands

Natural restoration has often been considered an effective measure for rehabilitating degraded ecosystems. However, its impact on the structure and diversity of soil microbial communities, particularly within a salinized grassland during its restoration succession, remains unclear. In this study, we examined the effects of natural restoration on the Shannon-Wiener diversity index, Operational Taxonomic Units (OTU) richness, and structure of the soil microbial community of a sodic-saline grassland in China using high-throughput amplicon sequencing data from representative successional chronosequences. Our results indicated that natural restoration resulted in a significant mitigation of the grassland salinization (pH from 9.31 to 8.32 and electrical conductivity from 393.33 to 136.67 μs·cm−1) and a significant alteration of the soil microbial community structure of the grassland (p < 0.01). However, the effects of natural recovery differed in terms of the abundance and diversity of bacteria and fungi. For example, the relative abundance of the bacterial phyla Acidobacteria increased by 116.45 % in the topsoil and 339.03 % in the subsoil, while that of the fungal phyla Ascomycota decreased by 8.86 % in the topsoil and 30.18 % in the subsoil. There was no significant effect of restoration on bacterial diversity, but fungal diversity increased by 15.02 % in the Shannon-Wiener index and 62.20 % in the OTU richness in the topsoil. Model-selection analysis further corroborated that the alteration of the soil microbial structure by natural restoration may be due to the fact that the bacteria could adapt to the alleviated salinized grassland soil and the fungi could adapt to the improved soil fertility of the grasslands. Overall, our results contribute to an in-depth understanding of the impacts of natural restoration on soil microbial diversity and community structure in salinized grasslands during the long-term successional course. This may also help to apply natural restoration as a greener practice option for managing degraded ecosystems.

Diversity of bird agroforestry species in Sapen Nusantara Conservation Park of Mount Arjuno, Pasuruan

The Sapen Nusantara Conservation forest park is agroforestry that has certain vegetation. The vegetation in Sapen Nusantara Protected forest park seems to support the existence of birds as wildlife that need a living habitat. The existence of bird species in Sapen Nusantara Protected forest park is very important in supporting agroforestry vegetation. However, until now the diversity of bird species there has not been identified and recorded properly. The forest is one of the buffer forests of Mount Arjuno protection forest, so the ecosystem must be maintained. This study aims to analyze the diversity of bird species in the agroforest forest area in Sapen Nusantara Conservation forest park, Ledug Village, Pasuruan. The research was conducted in July 2021 using the direct observation method (point count) on ecotourism routes by calculating and recording the trails traversed using GPS, sampling by observing walking along the path/road accompanied by predetermined observation points, identification based on MacKinnon et al., (2010) and information on the status of its protection. Data analysis used the Shannon-Wiener diversity index, evenness index, and species richness index. The results of the study identified 18 bird species from 16 families with a total of 169 individuals. Of all the birds found, 18 species are listed in IUCN status, and 4 are listed in the protected status PP No. P.106 of 2018 and 3 species are listed in the CITES category Appendix II. It is known that the Shannon diversity index (H'=2,547) is in the medium diversity category. species evenness index (E=0.9) with a high evenness category and stable community. Then the specific wealth index (R=3.31) with the category of species richness is classified as medium. The presence of birds in the Sapen Nusantara conservation park forest indicates that the ecosystem in the forest is still maintained and this cannot be separated from the role of the community, especially the Ledug Lembaga Masyarakat Desa Hutan (LMDH), which manages and maintains the forest.

Use of multivariate analysis to identify phytoplankton bioindicators of stream water quality in the monomodal equatorial agroecological zone of Cameroon.

The aquatic ecosystem is compromised by many contaminants that may reduce ecosystem functions and severely affect human health. This study aimed at determining suitable phytoplankton bioindicators of water quality for biomonitoring of freshwater streams in the monomodal agroecological zone of Cameroon. Water physicochemical and hydrological parameters, together with phytoplankton abundance and diversity, were measured from June 2016 to May 2017 along the Benoe Stream. Principal component analysis and redundancy analysis were used to determine phytoplankton spatial and temporal distribution and identify indicator species. The Shannon-Wiener diversity and Pielou's evenness indices indicated a clean to mildly polluted stream with a diverse phytoplankton community consisting of 84 genera belonging to 51 families that was dominated by the Bacillariophyta (64%), followed by Chlorophyta (13%) and Cyanophyta (10%). The total dissolved solids, electrical conductivity, stream water velocity, and discharge were the most important stream characteristics affecting the abundance of the dominant phytoplankton genera. Seasonal variations in the stream characteristics as well as spatial community distribution along an urban-small-scale farming - large-scale farming gradient were unveiled and their influence on the phytoplankton relative abundances. Increased abundance of Synedra ulna was indicative of low TDS and EC, which was the contrary for Gyrosigma baltium dominance. High Pleurosira laevis abundance was associated with the urban zone while high Diatoma sp. and Oscillatoria sp. abundances were related to the large-scale farming zone of the stream. These phytoplankton species have good potential for use as bioindicators for stream water quality monitoring in the monomodal agroecological zone.

Spatial diversity patterns of understory shrub community in Srengseng urban forest, Jakarta

Urban forests are one of the natural ecosystems in urban environments. One of the most important components of the urban forest ecosystem is the understory shrubs. Therefore, this study aims to estimate the diversity of understory shrubs in the Srengseng Urban Forest in Jakarta City. The biodiversity of understory shrubs is calculated using the Shannon-Wiener diversity index (H') and mapped using the Geographic Information System (GIS). In this study, 24 plots measuring 2 m by 2 m each were placed to survey the understory shrubs. In total, there were 20 species of shrubs identified, which belong to 12 families with average values of H' is 0.671. The results show that almost 62.78% of the total Srengseng Urban Forest area has a H' diversity range of 1.001–1.500. In comparison, 8.62% of total urban forest area has an H' diversity range of 0.501-1.000. The area of urban forest with the lowest diversity in the H' diversity range of 0.000 to 0.500 reaches 28.58%. The eastern parts of the urban forest have the highest H' in comparison to the other parts of the forest. This study contributes to the conservation and forestry management of forest at an urban scale by identifying parts of the urban forest that should be conserved in the Srengseng. To conclude, the eastern parts of Srengseng Urban Forest sizing 64,765 m2 should be prioritized for understory shrub conservation.

Butterfly (Lepidoptera: Papilionoidae) diversity and structure community in Lumajang, East Java, Indonesia

Abstract. Millah N, Leksono AS, Yanuwiadi B. 2023. Butterfly (Lepidoptera: Papilionoidae) diversity and structure community in Lumajang, East Java, Indonesia. Nusantara Bioscience 15: 118-128. Lumajang is one of the district in East Java, Indonesia with an area of around 1,790.90 km2 with various ecosystems. Unfortunately, several ecosystems in Lumajang have been degraded, affecting biodiversity, especially butterflies. The aim of this study was to analyze the structure of butterfly communities in Lumajang and analyze the species as bioindicators. The study was conducted in 5 habitats: Village, Agriculture, City Park, Community Forest, and Conservation Forest. The butterfly sampling method in this study was an Active Visual Survey using the Transect Pollard Walk; environmental factors were also measured during the study (temperature, humidity, light intensity, wind velocity, and altitude). The butterfly diversity and the measurement of environmental factors were analyzed for correlation using the Principal Component Analysis (PCA). The results of the study consisted of 124 species. Several were endemic species (Cyrestis lutea (Zincken, 1831), Ypthima nigricans (Snellen, 1892), Parantica albata (Zincken, 1831), Mycalesis sudra (Felder, 1867), and Pachliopta adamas (Zincken, 1831)), then protected species (Troides helena (Linnaeus, 1758), Troides cuneifera (Oberthür, 1879), and Troides amphrysus (Cramer, 1779)). The Shannon-Wienner diversity index values from highest to lowest are Community Forest (3.52), Conservation Forest (3.32), City Park (2.98), Village (2.79), and Agriculture (2.29). The results can be used as basic data and are expected to support butterfly conservation strategies in Indonesia, especially in Lumajang, East Java, Indonesia.

Evaluation of Natural Enemy Abundance Based on Riparian Vegetation at Rice Field in Slamet Village, East Java, Indonesia

Riparian vegetation habitats in irrigation canals provide various ecosystem regulatory services for human life, one of them was providing natural enemies for agricultural pests. This study aims to analyze the abundance of natural enemies at the paddy field, then to figure out the interaction between the riparian vegetation and natural enemies based on four different locations of tertiary irrigation canals at Slamet Village. Arthropods were observed by visual control and yellow pan trap methods. Whereas, riparian vegetation sampling points were determined by purposive sampling. The measured riparian vegetation and natural enemies were described by the important value index (INP), abundance, Shannon-Wiener diversity index (H'), evenness (E), dominance index (Id), and taxa richness (TR). The interaction between the riparian vegetation and natural enemies was analyzed by the PAST 3.20 program. The results showed that the first location of irrigation canals had the highest Shannon-Wiener Index value, taxa richness, evenness, and the lowest dominance value of riparian vegetation with respectively 4.97; 37 species; 0.93; and 0.02. Moreover, it was following with the highest value of natural enemies taxa richness (16 species), total abundance (4450 individuals), H' index (2.37), evenness (0.59), and low dominance index (0.27). Arthropods that act as natural enemies that were commonly found in this location came from the Formicidae, Coenagrionidae, and Coccinelidae families, while the most common pests found are from the Acrididae families. The opposite of that, the fourth location had the highest value of dominance index of riparian vegetation and pest arthropods (0.15; 0.84), H’ index of pest (2.31), taxa richness of pest (0.77), and the total abundance of pest arthropod (942 individuals). Pests that inhabit this location came from the Acrididae, Drosophilidae, Tephritidae, and Aphididae families

Diversity and Distribution of 18 Cephalopod Species, and Their Link with Some Environmental Factors in the NW Pacific

Some cephalopods are important fishery resources, with some major economic species living in pelagic waters, possessing short life history cycles, and responding strongly to environmental changes. The analysis of cephalopod community species composition, catch distribution, and their relationship with environmental factors in important marine areas can provide a basic reference for cephalopod biogeography and resource development and utilization. In this study, based on the cephalopod survey data in the spring of 2015 and summer of 2016 in the Pacific Ocean, we analyzed the cephalopod species composition, diversity index (the Margalef richness index, Shannon–Wiener diversity index, and Pielou uniformity index), main contributing species, and catch distribution in the two seasons of spring and summer in the Pacific Ocean. We also analyzed the relationship between cephalopod catch, each diversity index, and environmental factors in each season using the GAM model. The results show that 18 species of cephalopods were captured in the spring and summer, the Margalef richness index, Shannon–Wiener diversity index, and Pielou uniformity index in summer was higher than that in spring; the average catch biomass in spring was significantly higher than that in summer. The main contributing species in spring was Todarodes pacificus, while the main contributing species in summer was Ommastrephes bartramii. The interaction of the “longitude” and “latitude” has a great impact on cephalopod catch biomass in spring, and “sea surface temperature” has a great impact on cephalopod catch biomass in summer. The results of the study can provide a basic reference for the study of cephalopod diversity and resource development and utilization in the Pacific Ocean.

Butterfly Diversity from Isolated Lowland Area: An Assessment in Langsa Urban Forest, Langsa, Aceh, Indonesia

Langsa Urban Forest (LUF) is a 10-ha of the isolated urban forest in Langsa, Aceh, which is maintained to preserve urban biodiversity such as the butterfly. No recent study has been done in this area on butterfly biodiversity including the diversity and plant's potential for host and food plant sources. A one-month survey in July 2021 using the standard walk method on four transects was conducted. There are 36 species recorded during this study including 5 families, with Nymphalidae as the most abundant family and Leptosia nina as the most abundant species. Shannon-Wiener diversity index was used for this recent research with the value of H’ 1.78–2.78 and the Evenness index with scale 0.66–0.94. Most of the species have broad geographical ranges, with 3 of them restricted to the Indomalayan realm. There are 117 plants were recorded which 33 species supposed as host and food plants divided into 26 as host plants, 11 as food plants, and 4 for both. No specific plants threatened the collected butterflies, but it's important since providing diversity data.

Vegetation Structure and Tree Species Diversity inside and outside a Newly Established Zalon Taung National Park in Northwest Myanmar

The Zalon Taung National Park (ZNP) in Banmauk township, northwest Myanmar, is a recently established protected area to protect the area’s cultural value, ecosystems, native flora, and wildlife. This research examined the vegetation structure, tree species diversity, and composition within (ZNP) and outside (the Banmauk unclassified forest (BUCF)) the park to inform conservation and resource utilization for sustainable management. We conducted the vegetation survey in April-May of 2022 by setting up 34 sample plots (40 × 40 meters) using a random sampling approach. We used stand density, basal area, Shannon–Wiener diversity index, Simpson index, Pielou's evenness, Fisher’s α diversity, and Importance Value Index (IVI) to determine the forest structure and tree diversity. A total of 116 tree species (≥10 cm·dbh), representing 87 genera and 48 families, were identified. The ZNP sample plots had a slightly higher stand density (201 individuals ha−1) and basal area (20.6 m2·ha−1) than BUCF (stand density: 191 individuals ha−1 and basal area: 15.0 m2·ha−1), which is accessible to collect firewood and timber extraction by residents. The reverse J-shaped pattern of the population structure indicated that the stands’ populations were progressive and healthy. BUCF featured the most Verbenaceae (12.9%) and the ZNP the most Euphorbiaceae (7.2%) families. Protium serratum had the highest IVI in the BUCF (26.91%) and Dipterocarpus alatus (18.39%) in the ZNP. Dipterocarpus alatus and Dalbergia oliveri (IUCN Red List-endangered species) dominate in BUCF and require special attention in conservation planning. In the ZNP, previous logging activity dramatically reduced the relative density and the IVI values of commercially important species such as Tectona grandis, Dalbergia oliveri, and Protium serratum. According to the NMDS ordination, differences in tree species compositions were significantly linked with elevation, the intensity of logging, and distance to the village and road. The results will help park managers plan effective land use to promote biodiversity conservation and local livelihoods.

Diversity of Spontaneous Plants in Eco-Parks and Its Relationship with Environmental Characteristics of Parks

Suburban areas connect the city and the natural land. This kind of area is subject to high ecological sensitivity. To give full play to the ecological value of spontaneous plants, it was applied to the construction of suburban parks. We need to explore the influence factors of park characteristics on spontaneous plants. This study takes Jiangyangfan Ecological Park as the main research object. We have investigated the spontaneous plants in it and the surrounding parks. Hence, 16 kinds of park environmental characteristic factors were selected to explore their effects on the composition and diversity of spontaneous plants. The results showed that: (1) There were 138 species of spontaneous plants belonging to 126 genera and 62 families in Jiangyangfan Ecological Park. Native plants accounted for 88.10%. (2) The Shannon-Wiener diversity index of spontaneous plants was ranked as Jiangyangfan Ecological Park &gt; White Pagoda Park &gt; Eight Diagrams Field Relic Park &gt; Haiyue Waterscape Park. (3) Among the overall characteristic factors, the park perimeter and the actual accessible area had the most significant positive correlation to the diversity of spontaneous plants (p &lt; 0.05). Among the environmental element characteristic factors, the Shannon-Wiener diversity index of cultivated plants had the strongest positive correlation with the diversity of spontaneous plants (p &lt; 0.01). The number of water bodies presented the strongest negative correlation (p &lt; 0.01). This study provides a useful reference for the rational planning of parks in suburban areas and the construction of sustainable urban and rural landscapes. The research results will contribute to the restoration of the ecological environment.

Diversity and Community Structure of Dragonflies (Odonata) in Various Types of Habitat at Lakarsantri District, Surabaya, Indonesia

Dragonflies are insects that are very dependent on the existence of freshwater ecosystems, However, the population of dragonflies in urban freshwater ecosystems is at risk due to a number of issues. Consequently, it is essential to carry out research and efforts to preserve dragonflies in urban areas. This study aims to provide information about the diversity and structure of dragonfly communities in various habitat types in the Lakarsantri, Surabaya. Data collection in this study was carried out in the habitat types of ponds, reservoir, river, and rice field in July to September 2021. The study results show there are 22 species from 4 families with a total of 827 individuals. Analysis of the Shannon-Wiener diversity index showed that the highest value of dragonfly diversity was found in a pond, with a value of H' = 2.40, and the location with the lowest value was a river, with a value of H' = 1.77. At four research locations that have different aquatic ecosystems, the community structure of dragonfly is also different. The composition of the dragonfly community structure at the reservoir location has similarities to a pond, and at a river location, it has similarities to a paddy field. Differences in abiotic factors consisting of light intensity, humidity, and temperature at each study location have a correlation with differences in dragonfly community structure. In addition, the composition of the vegetation at each location is also one of the factors causing differences in the structure of the dragonfly community.

Bird Diversity in Paddy Field Habitats During The Paddy Ripening Phase (Oryza sativa L.) Jurong Peujeura Village, Aceh Besar Regency, Indonesia

Birds are organisms that can be found in a variety of habitats. One of the bird habitats is paddy fields. Birds found in paddy fields generally carry out activities such as foraging, breeding, and competing. This study aims to determine the diversity of birds in paddy field habitats during the paddy ripening phase (Oryza sativa L.). The study was conducted from April to June 2022. The location of the study was Jurong Peujera Village, Ingin Jaya District, Aceh Besar Regency. This study used the Point Count method with a radius of 50 m and a distance between points of 150 m. Observations were made at 9 observation points with 4 repetitions, in which the duration of observations was 10 minutes at each observation point. The observation was conducted in the morning and evening at 06.30-10.00 AM and 03.30-05.00 PM. The results obtained were 2586 bird individuals consisting of 14 species from 11 families. The species with the highest number of individuals are Lonchura punctulata with 1535 individuals and Bubulcus ibis with 637 individuals. The highest percentage of families by species is Ardeidae (22%), and Estrildidae (15%). The Shannon-Wiener bird species diversity index in the paddy field area during paddy ripening phase was obtained H'=1.24 which indicates the level of diversity of the bird species is moderate. Meanwhile, based on the dominance index, Simpson shows a value of C=0.42 which indicates a low bird dominance level. The low level of bird dominance is due to the moderate diversity of species in the paddy field area.

Evaluating Surface Water Quality Using Indexes of Water Quality and Plankton Diversity

The study aimed to assess the relationship between surface water quality and the diversity of planktonic communities in An Giang province, Vietnam. The national technical regulations on surface water quality, the water quality index (WQI), and the Shannon-Wiener diversity index (H') were applied to evaluate water quality. The considerable influence of water quality parameters on the dominant plankton was determined by canonical correspondence analysis (CCA) and similarity percentage analysis (SIMPER). The results showed that water quality was contaminated by organic matter, total suspended solids (TSS), and microorganisms. WQI values classified water quality as ranging from bad to good. The species composition of phytoplankton was dominated by two phyla, Chlorophyta and Bacillariophyta, and that of zooplankton was the Rotifera group. SIMPER analysis identified phytoplankton species with dominant density, including Melosira granulata, Pediastrum duplex, Anabaena sp., and Lyngbya circumcreta. Microcyclops varicans, Filinia longiseta, Trichocerca pusilla, Copepoda nauplius, Brachionus caudatus, and Polyarthra vulgarisdominated the density of zooplankton. Temperature, pH, TSS, ammonium, orthophosphate, and coliform considerably influence the dominant species composition of plankton. However, the indicators of diversity and composition of plankton were unable to completely reflect water quality. These findings could contribute to the indicator selection in developing the monitoring water quality programs. Doi: 10.28991/CEJ-2023-09-05-011 Full Text: PDF

Insect Pest Diversity of Corn Plants (Zea mays) in Baringeng Village, Soppeng Regency, South Sulawesi Province

Background: Baringeng is a corn-producing village in Soppeng Regency, South Sulawesi. The main problem for corn farmers in the town is insect pests. Insect pests damage the plant, which has an impact on decreasing yields. Control of insect pests must be by the type of insect pests. This study aims to calculate the diversity of insect pests of corn in Baringeng Village and the damage they cause. Methods: Data was collected in Takku Hamlet, Baringeng Hamlet, and Tanjonge Hamlet. with a systematic plot sampling method with the help of light traps, sweep nets, and direct collection of pests. Observations included the number of individuals and types of insect pests. Data were analyzed by the Shannon-Wiener diversity index (H'), evenness index (E), dominance index (C), and similarity index. Results: There were three types of insect pests with a total of 153 individuals that attacked corn in Baringeng Village, namely grasshoppers (Oxya sp.), planthoppers (Peregrinus maidis), and armyworm (Spodoptera frugiperda). The diversity index is included in the low category (H'=0.89), the evenness index (E) is in the high sort (E=0.81), the dominance index is in the low sort (C=0.44), and the lowest similarity index shown between Dusun Baringeng and Dusun Takku (IS=50%). Conclusions: The types of insect pests found in Baringeng Village come from three different orders, namely Orthoptera, Lepidoptera, and Hemiptera. Each problem shows other attack characteristics, but all attack the leaves. So that pest control can use natural materials by spraying on leaves, polyculture, crop rotation, or taking pests directly.

Woody Species Composition, Structure, and Regeneration Status of Gosh-Beret Dry Evergreen Forest Patch, South Gondar Zone, Northeast Ethiopia

Owing to its variable topographic features, Ethiopia is endowed with rich biological resources. However, nowadays, these vital resources, mainly forests, are declining alarmingly, largely, due to agricultural expansion and energy consumption. This study was conducted at Gosh-Beret forest with the objective of investigating the status of forest species. Fifty-one main plots, spaced at a 100 m interval, were laid on north-south oriented transects. Within the main plots, five subplots, at each corner and center, were set to collect data for juveniles. In each plot, individuals of each woody species were identified and recorded. Percent cover abundance of each woody species per plot was genuinely estimated, which was later converted into the modified Braun–Blanquet scale. For each mature woody species, diameters at breast height (DBH ≥ 2 cm) were measured. Hierarchical cluster analysis was performed to identify community types. The Shannon–Wiener diversity index and Sorensen’s similarity coefficient were used to compare the species diversity and composition among communities, respectively. The structure and regeneration status of the forest species were analyzed using structural parameters and size-class ratios, respectively. A total of 52 woody species distributed in 35 families were recorded. Fabaceae, Euphorbiaceae, and Asteraceae were the most dominant families with 4 species each. The overall species diversity of the forest was 2.6, and five community types were generated from cluster analysis. In the study forest, frequency and density of species decrease with increasing frequency and density classes. Likewise, density of individuals in each class decreases as DBH classes increase. The total basal area of the forest was 19.81 m2ha−1, and the forest was at fair regeneration status with species having small IVI values and few/no seedlings. Therefore, immediate conservation measures are required to save species with small IVI values and few/no seedlings.