Quadratic Transect Research Articles

Keanekaragaman Vegetasi Pohon pada Lahan Pekarangan di Desa Tambakrejo Kecamatan Jombang Kabupaten Jombang

Tambakrejo Village is an urban area located in the Jombang District. Tree vegetation continues to decline; one of the factors is the conversion of the function of yardland to residential areas. Changes in the land area will impact the structure of tree vegetation. This research was conducted by purposive sampling in 4 hamlets. Transects and species were included as random effects using the transect quadrat method (quadrat transect) by purposive sampling with tree size (10x10 m<sup>2</sup>). The data analysis was done qualitatively and quantitatively. Quantitative data analysis using vegetation analysis, namely: Importance Value Index (IVI), Dominance (C), and Diversity Index (Ĥ). Strata 3 tree vegetation H’ index in Tambakrejo Village, each hamlet is different, for Tambakberas Hamlet, H’ index value is 3.11%, Gedang Hamlet 2.97%, Nglungu Hamlet 2.91%, and for Petengan Hamlet 2, 89%. Most of the hamlets in Tambakrejo Village fall into medium-level diversity. INP index of Tambakberas Hamlet of 22.59% and lowest 2.07%. Gedang of 27.57% and lowest 2.84%, Nglungu of 19.76%, and lowest 2.86% Petengan of 28.79% and lowest 2.73%, The lowest Important Value Index is due to the transfer of the function of yard land for residential areas.

Life form, diversity, and spatial distribution of macroalgae in Komodo National Park waters, East Nusa Tenggara

Komodo National Park is one of the favorite destinations for both domestic and international marine tourism. Marine tourism activities have caused environmental changes and impact on fisheries and marine resources. Macroalgae were also affected by the environmental changes, so management of macroalgae was required. Ecological data of macroalgae can be used as baseline data for coastal area management. The study aimed to determine the life form, species composition, spatial distribution, and ecological aspects of macroalgae assemblages in Komodo National Park waters. The study was conducted in September 2013, in eight locations, namely Setuga, Komodo Karang Makasar, Padar Kecil, Padar, Papagarang, Mangaitan, and Muntia island. Macroalgae samples were collected by the quadratic transect method. The data analyzed were Sorensen’s similarities. A total of 42 species of macroalgae were recorded, consisting of three Phylum: Chlorophyta (19 species), Ochrophyta (8 species), and Rhodophyta (15 species). Epilithic was the dominant life form of macroalgae. In general, macroalgae can be stably attached to hard substrates. The highest macroalgae diversity was found on Mangaitan Island (22 species). Halimeda and Amphiroa were macroalgae that can be found in almost all locations. Setuga Island had similar macroalgae with both Mangaitan and Muntia islands. The differences in the number of macroalgae species were influenced by environmental pressure, topography, and substrate profile. Management of macroalgae resources was needed to maintain the sustainability of the macroalgae ecosystem.

Development of Mangrove Ecotourism in Bandar Bakau Dumai Based on Disaster Mitigation

Natural disasters that occur in the city of Dumai such as degradation of mangrove forests, coastal abrasion and tidal flooding can be mitigated by maintaining the existence of mangrove forests. Mangrove forests have important benefits on the coast of the city of Dumai, so they need to be protected together. One of the efforts to maintain the existence of mangroves can be through the use of mitigation-based mangrove ecotourism, especially in the Bandar Bakau area of Dumai City. The data collection technique in this study used a quadratic transect and added secondary data from the relevant agencies. Based on the results of the study found 9 types of mangroves that have a role as mitigation in ecotourism locations and there are biota supporting tourism, namely 13 species of birds, 7 species of reptiles and 16 species of molluscs. To maintain the sustainability of the ecotourism area of Bandar Bakau, several disaster mitigations have been carried out for retaining cliffs (revetment), reforestation of mangroves, construction of facilities that adapt to the environment, coastal education, and outreach to the community. In addition, it is very potential to develop several other forms of mitigation such as: beach nourishment, breakwater or construction of embankments to minimize abrasion, as well as construction of diversion canals and tidal flood control gates, strengthening regulations. legislation, making land use policies, policies on flood and wave resistant building standards, policies on exploration and community economic activities, promoting local cultural wisdom of maritime communities.

Ascidians Outbreak: A Threat For Coral Reefs in Panjang Island, Jepara

Eutrophication and sedimentation have become a major threat to coral reefs in nearby areas with anthropogenic activities. These threats are often accompanied by shifting ecosystems from coral-rich to fast-growing algae-dominated water, and high prevalence of coral disease. In Panjang Island, Jepara, we observed the outbreak of photosynthetic ascidians along with a high sedimentation at the eastern part of the island. The ascidians were seen overgrowing most substrates including corals, macroalgae, dead-coral-algae, and rubbles in April to May 2019. In July and August 2019, observation and data collection using quadrant transect were conducted to monitor the outbreak. The result showed that ascidians were still present in the area, despite becoming pale and smaller. This report shows that the outbreak of these photosynthetic ascidians was not persistent, however, the effect on coral reef health should not be overlooked.

Ecological Conditions of Enhalus acoroides (Linnaeus f.) Royle, 1839 and The Influencing Factors at Sari Ringgung Beach, Pesawaran District, Lampung

This research was conducted from May to June 2020, located at Sari Ringgung Beach, Pesawaran District, Lampung Province. This study aims to assess the ecological conditions of Enhalus acoroides seagrass and to analyze the relationship between Enhalus acoroides ecosystem and water quality. Determination of observation points using purposive sampling method. Data on seagrass conditions and measurement of water quality parameters were carried out using a quadratic transect measuring 50 cm x 50 cm. The relationship between seagrass density and coverage with water quality parameters was tested using principal component analysis (PCA). The results showed that the type of seagrass vegetation at Sari Ringgung beach was single with the type of seagrass Enhalus acoroides. The highest average density value of Enhalus acoroides was at station 3 with a range of 76 individuals / m2 and the lowest density was at station 1 with a range of 36 individuals / m2. Meanwhile, the highest average value of Enhalus acoroides cover was at station 3 with a range of 48.48% / m2 and the lowest was at station 1 with 25.0% / m2. Seagrass density and cover have a positive correlation with phosphate, temperature, depth, brightness, and current and negatively correlated with parameters TDS, TSS, salinity, dissolved oxygen (DO), pH and nitrate.

IDENTIFIKASI JENIS MANGROVE PADA KAWASAN RESTORASI EKOSISTEM MANGROVE DI DESA KEUDE PANGA KECAMATAN PANGA KABUPATEN ACEH JAYA

This study aimed to identified mangrove species, calculated the total number and composition of mangroves, and the structure of zonation mangroves at the mangrove relocation area in Keude Panga Village, Panga District, Aceh Jaya Regency. The study was carried out on April 2021, for one month with two replications. The research method was the survey method, namely directed observation to research location. A sampling of mangroves used the quadratic transect method, which was divided into 3 transect points with the categories of tree plots measuring 10 m x 10 m, sapling plots with 5 m x 5 m, and the seedling plots measuring 1 m x 1 m. Data analyzed of the total number and composition of mangroves used Microsoft Excel 2010 and zonation of mangrove analysis was carried out descriptively. The results showed on the research at both stations founded 3 species of true mangrove and 1 species of scrub respectively, namely Rhizhopora mucronata (19% sapling level), Rhizhopora apiculata (34% sapling level), Nypa fruticans (47% tree level), Acrostichum aureum (or 100% shrub category) and Rhizhopora mucronata (23 individuals or 37% sampling level), Rhizhopora apiculata (15 individuals 20% sapling level), Nypa fruticans (36 individuals or 49% tree level), Acrostichum aureum (100% shrub category). Structure zonation of mangrove vegetation is composed of 3 species of mangroves, namely Rhizhopora mucronata which was located closest to the sea, Rhizhopora apiculata was in the middle of the mangrove ecosystem, and Nypa fruticans was a pioneer mangrove located close to the mainland.

Recruitment of hard coral after coral bleaching in Krueng Raya Water, Aceh Besar

Krueng Raya waters is an area that has a distribution of coral reef ecosystems. This study aims to determine the recruitment of hard corals after coral bleaching Krueng Raya waters, Aceh Besar District. This research was conducted in April 2017 in Krueng Raya, Aceh Besar. Data were collected at three observation stations using a systematic sampling method using a 1x1 m quadratic transect. Based on the study results, coral recruitment was obtained from eight families and 13 genera (Acropora, Cetenactis, Diploastrea, Favia, Favites, Galaxea, Goniastrea, Helliopora, Leptastrea, Montastrea, Pavona, Pocillopora, and Porites). Where the most abundant coral genus found was from the genus Pocilopora and Porites (16 coloni/10m2). while the station with the highest colony abundance was at station 3 with 28 colonies/10m2.

Population structure of lamp shells (Brachiopoda: Lingula anatina Lamarck, 1801) in Aceh Northern Shore, Indonesia

This study aimed to determine the population structure of Lingula sp. in the Aceh northern shore. This research uses purposive sampling method where the sampling locations at Ujong Pancu beach, Kuala Cangkoi beach, Syiah Kuala beach and Alue Naga beach. Sampling was carried out using a quadratic transect (1x1 m) with three stations at each location. The results showed that there is one type of Brachiopods, namely the genus Lingula (Bruguière 1791), species Lingula anatina Lamarck, 1801 which are scattered on the north coast of Aceh. Overall, the abundance of L. anatina was quite high at each location, especially at Kuala Cangkoi beach (2.43 ind/m2), while the lowest abundance was found at Ujong Pancu beach (1,11 ind/m2). In addition, it was also found that L. anatina had a similarity distribution on the Aceh northern shore. The existence of L. anatina on the Aceh northern shore is very dependent on good environmental conditions, in general, the quality of the waters of Aceh northern shore is still within the tolerance limits of these biota. Therefore, population structure of L. anatina is stable, so that this biota resource must continue to be considered and managed properly.

The density and distribution of Pacific Oyster (Crassostrea gigas) in Krueng Cut, Aceh Besar

Crassostrea gigas is a Pacific oyster that has the largest size among the other oysters. This oyster is most often found because of its ability to adapt to a variety of environments. Krueng Cut is an estuary area that gets a lot of nutrient input from sea water because it is directly adjacent to the ocean. This condition makes this area has a high abundance of oysters with high fishing and antropogenic activities as well. The purpose of this study was to determine the density and distribution of the oyster population from 3 representative stations along the estuary area of Krueng Cut. The method used in this study is random sampling using a quadratic transect. The results show that the highest density is indicated by station 3 with 55.67 ind/m2 and the lowest density is indicated by station 1 is 40.33 ind/m2. These results indicate that the activities of residents, the entry of contaminants from antropogenic affect the density of oysters. The distribution of oysters from the three stations showed similarities, namely they tended to grouping. The aquatic environment at the three research stations still supports the growth of oysters. This study confirms that there has been a decline in the population, which is characterized by a decrease in the number of catches and a smaller size of oysters.

Analysis of marine debris and mangrove forest density in Purnama village, Dumai city, Riau province

Mangrove ecosystems naturally function as trap of waste produced from anthropogenic activities including marine debris. This study aims to analyze marine debris and density of mangrove forests in the Purnama Village. The survey research method was carried out in two stations: Station I (Estuary of Sungai Masjid) and Station II (coastal waters of the Unri Marine Station), which was held from April to July 2021. Marine debris was collected in five plots in a quadrant transect measuring 100 x 50 meter. Identification results of mangrove species in Station I found 3 species of mangrove (Xylocarpus granatum, Rhizophora apiculata and Bruguiera gymnorriza), while at Station II found 3 species of mangroves (Rhizophora apiculata, Xylocarpus granatum and Avecennia alba). This research results obtained the release of marine debris at Station II is more than that of Station I. While in Station II there are 172 items (marine debris density of 0.172 item/m2), weight of marine debris 12.665 grams/m2 and mangrove density 2222 individu/ha (category very close). At Station I there are 35 items (the density of marine debris is 0.035 item/m2), the total weight of marine debris is 3.194 grams/m2 and the density of mangroves is 1678 individu/ha (category very close).

Community structure of sea cucumber on Harapan Island and East Penjaliran Island, Kepulauan Seribu National Park, Indonesia

Sea cucumbers are marine animals of the Holothuroidea Class that have ecological, health, and socioeconomic benefits. This study aims to determine the structure of the sea cucumber community on Harapan Island and East Penjaliran Island, Kepulauan Seribu National Park, Kepulauan Seribu Regency. Data collection was conducted in January 2020, where each island was divided into two stations, and each station was divided into three substations for data retrieval. The method is a quadratic transect method using a plot measuring 1x1 m. In each square plot, observations were made regarding the type and number of sea cucumbers found and water quality parameters, including salinity, temperature, pH, DO, and total organic matter. Observation parameters include diversity index, uniformity index, frequency, density, important value index, dominance, and sea cucumber distribution index. During the study, species found on Harapan Island include H. atra, H. scabra, H. leucospilota, Bohadschia marmorata, and Stichopus herrmanni. Meanwhile, species found on East Penjaliran Island include H. atra, H. leucospilota, H. coluber, H. pardalis, H. fuscocinerea, H. hilla, Bohadschia marmorata, Stichopus ocellatus, and Stichopus monotuberculatus. The most abundant and predominant species on both islands is Holothuria atra. The average diversity index on Harapan Island falls into the low category, while East Penjaliran Island is classified as medium. The dominance index of both islands is low and has a uniform distribution. Environmental conditions and sea cucumber exploitation affect the structure of sea cucumber communities on both islands.

KARAKTERISTIK EKOLOGI MANGROVE DI KAWASAN SILVOAKUAKULTUR

The development of mangrove by silvoaquaculture approach is an integrating between mangrove conservation and economic improvement of coastal communities by aquaculture production. The study aims to determine the ecological characteristics of mangroves in silvoaquaculture areas. The research locations include Karangsong, Brondong, and Pabean Ilir in Indramayu Regency and use a survey technique using the quadrant transect method. The silvoaquaculture pond area in Indramayu Regency has five types of mangroves, namely Avicennia marina, Avicennia alba, Rhizophora apiculata, Rhizophora mucronata, and Rhizophora stylosa. Rhizophora mucronata is the dominant mangrove species. The best mangrove ecological conditions are found in empang parit and komplangan ponds, so based on the ecological characteristics of mangroves, it is recommended that the development of silvoaquaculture ponds use empang parit or komplangan type of pond.

Potensi Kandungan Karbon Keragaman Spesies Lamun di Perairan Pesisir Selatan Lombok Timur

through the development of carbon zinc as an organic material produced from photosynthesis and stored and transported in the form of seagrass vegetation biomass. Seagrass is one of the aquatic vegetation that is able to absorb and store carbon. Seagrasses have the ability to absorb carbon through the process of photosynthesis. The purpose of this study was to describe the potential carbon content of seagrass species in the South Coastal Waters of East Lombok. This type of research is an expolarative descriptive research. The research method is a quadratic transect method. The population of this study were all seagrass species contained in 3 research stations. The collected data was then analyzed using analysis of seagrass species composition, seagrass cover, seagrass density, diversity, uniformity, dominance and analysis of carbon content through seagrass stand biomass (leaves, rhizomes/stems and roots). The result of this research is the discovery of 9 species of seagrass on Lungkak Beach and 5 species of seagrass on Gili Kere and Poton Bakau. The species density in the three study sites ranged from 0.09 to 56.91 stands/m2. Seagrass biomass values ranged from 1.47-261.9 gbk/m2 and total carbon content ranged from 295.91±202.88 gC. The value of this biomass and carbon content was dominated by seagrass species with large morphology such as Enhalus acroides, Thalasia hemprici, Cymodocea rotundata, and Cymodocea cerillata and high density and cover values of seagrass. The relationship between seagrass cover and seagrass carbon has a significant relationship where the higher the seagrass cover, the higher the carbon content of the seagrass.

KAJIAN KONDISI KESEHATAN PADANG LAMUN DI PERAIRAN MOKUPA KECAMATAN TOMBARIRI KABUPATEN MINAHASA

Seagrass ecosystems services in the coastal waters are included as primary producers, nutrient recycler, bottom stabilizers, sediment traps, and erosion barriers. Gleaning fisheries in seagrass bed in Mokupa waters could cause damage on seagrass, that can be marked by changes in seagrass cover. The purposes of this study were to identify the types of seagrasses and to determine the health condition of seagrass bed ecosystem in Mokupa waters. The research method used in this study is quadrat transect method. Data collection was carried out by laid three transects (100 m) with distance between each transect was 50 m. A square frame (50×50 cm2) which is divided into 4 squares is placed on the right side of the transect, with 10 m distance between frame. This study found four types of seagrasses, namely Enhalus acoroides, Thalassia hemprichii, Halodule pinifolia and Halophila ovalis. E. acoroides have the highest percentage cover (16.19%) followed byT. hemprichii (6.91%), H. pinifolia (4.50%) and H. ovalis (1.56%) respectively. Seagrass cover in the study area is considered medium (26-50%) while the health condition was poor (29.25%).

Feeding ground indications are based on species, seagrass density and existence of Dugong dugon in Hiri Island Sea, North Maluku, Indonesia

Seagrass ecosystems are located between mangrove ecosystems and coral reefs. Seagrass ecosystems are habitats and foraging area for many marine organisms. Eco-biological cycles in seagrass ecosystems are important for maintaining populations of many organisms. Seagrass at Hiri Island is distributed horizontally along the coast. This island is also a location where Dugong dugon is found North Maluku. Dugong dugon is a vurneable species that has been included in the IUCN and Appendix I Cites. This study aimed to identify species, density of seagrass and existence of Dugong dugong. The survey method used quadratic transect method to collect seagrass data. The Results found 6 species of seagrass at Hiri Island. Five species of those seagrass (Cymodocea serrulata, Cymodecea rotundata, Halodule uninervis, Halodule pinifolia, Halophila spinulosa) are known as food of Dugong dugon. The highest species density was shown by Halodule uninervis. The presence of Dugong dugon and its feeding trail was found during field survey. Information on seagrass species and Dugong dugon sightings location can be used for endangered species conservation policies. Management and conservation efforts need to be done to maintain seagrass ecosystem and Dugong dugon potential habitat at Hiri Island.

Riparian Tree Vegetation Diversity Salah Nama Island in Banyuasin, South Sumatera

Highlight Research:Riparian plants play an important role in maintaining the balance of an aquatic ecosystem.The diversity of riparian aquatic plants on the island of Salah Nama BanyuasinData collection on riparian plants used the quadratic transect methodThe results showed that there were 21 types of riparian aquatic plants in 16 families.The highest composition is in the Lythraceae family, namely Sonneratia acidaAbstractRiparian plants play an important role in maintaining the balance of an aquatic ecosystem. The missing plant components from a water can cause sedimentation and change the microhabitat in these waters. The purpose of the study is to determine the diversity of riparian aquatic plants on the island of Salah Nama Banyuasin. The research was conducted in August 2016, November 2016, and January 2017 at Salah Nama Island Mariana Ilir Banyuasin 1, South Sumatra. Sampling was done by using the purposive sampling method. Determination of the sampling location used GPS (Global positioning system). Observation stations consisted of 5 sampling locations. The method of taking water plants was done in exploratory way. Data collection on riparian plants used the quadratic transect method measuring 1 m x 1 m. Samples of riparian plants were taken then wrapped with newspaper or paper and put into large plastic, labeled then taken to the testing laboratory Institute Inland fisheries and extension, Palembang. The results showed that there were 21 types of riparian aquatic plants in 16 families. The highest composition is in the Lythraceae family, namely Sonneratia acida. The diversity index of aquatic plants ranges from 1 <H'<3 in the stable condition category. Based on the results of the study, the riparian plant species that dominated the most were Sonneratia sp. The conclusion that can be drawn is that the diversity of riparian plants on the island of Salah Nama is in the medium category, the dominant riparian plants are Sonneratia sp.

Pre-service biology teacher’s perception on local environment problems as contextual learning resources

A survey and exploratory study were conducted to analyze Lake Tempe as a resource for contextual learning (CTL). The first phase of the study included exploring the lake’s potential through interviews with the people who live in the lake’s coastal region. Quadrat transects were done to identify aquatic plants around the lake. A feasibility analysis was conducted to see the lake’s potential as a learning resource. Field data were collected and compared to the environmental biology (EB) curriculum, responses, and learning outcome. The data were analyzed descriptively and tested using a paired-sample t-test. The results showed differences in the three stations’ physicochemical parameters and decreased quality of the water. It was found that anthropogenic activity had a significant contribution to the lake’s pollution. Nine species of six aquatic plant families were found in the lake. The survey revealed that the lake was feasible as a learning resource with criteria easy to access, safety, time efficiency, costs, and the material's suitability for EB courses. The t-test showed a difference in the students’ scores between before and after exploration practices. These findings suggest that Lake Tempe<em> </em>can serve as a resource for CTL in EB courses.

Potensi Penyerapan Karbon Pada Padang Lamun (Seagrass) Di Teluk Youtefa Kota Jayapura, Papua

Climate change has been global warming as greenhouse gas emissions (GHG) caused by increased emissions of gases such as carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and chlorofluorocarbons (CFC) so that solar energy is trapped in the earth's atmosphere. Various efforts have been made to reduce the impact of climate change, one of which is by utilizing the oceans and coastal ecosystems as natural CO2 sinks. The purpose of this study was to determine the density, carbon sequestration in biomass and the habitat conditions of seagrass beds conducted in March 2021 in Youtefa Bay, Jayapura Papua. Seagrass density was carried out using the quadrant transect method, carbon content analysis was carried out using the ashing method. The results of the study found 1 species of seagrass, namely Enhalus acoroides, the density values ranged from 85.69 ind/m² - 102.56 ind/m². the value of biomass under the substrate ranged from 3321.75 - 3580.75 gbk/m² which was greater than the value of the biomass above the substrate, which ranged from 720.19 to 955.79 gbk/m², followed by the value of the carbon content under the substrate (roots and rhizomes) ranged from 87.30 – 96.92 g C/m² while the value of carbon content above the substrate (leaf) ranged from 35.99 – 44.84 g C/m². The total carbon stock in Youtefa Bay waters, Jayapura City, Papua ranges from 4859.38 – 6687.89 tons/ha.Key Words: Biomass; Carbon Content; Carbon Sequestration; Ashing Method; Youtefa Bay

Seagrass Vegetation Analysis in Jhembengan and Pasir Putih Beach, Bawean Island, East Java

Seagrass is a flowering plant that lives in coastal areas In Indonesia there are 12 species, where seagrasses are able to live at a depth of 1-90 meters, seagrass growth is influenced by several factors including the intensity of sunlight. The purpose of this study was to observe the cover, distribution, Importance Value Index (IVI) and correlation of abiotic factors with seagrass in Jhembangan Beach and White Sand on Bawean Island, East Java. The quadratic transect with 50 m length was used. Each station equipped with 3 transects with a distance of 25 m. The data collected includes the parameter of type, stand, and water quality. The data analyze use Past Program 3.15 systems. Three species of seagrass plant were collected. The total seagrass cover value was 32.6 percent at Jhembangan Beach, and 38 percent at Pasir Putih Beach. Clumped and uniform types were included in the distribution of seagrass at Jhembangan and Pasir Putih beach. The highest of important value index In Jhembangan and Pasir Putih was Thallasia hemprichii, while the association to abiotic factor such temperature, pH, salinity and DO variables are included in the good or perfect correlation with values range from 0.7 to 0.9.

Short Communication: Using ecological parameters to assess the sustainability of mangrove ecotourism in Jeneponto, South Sulawesi, Indonesia

Abstract. Askar H, Tahang H, Sutinah S, Fakhriyyah S, Bahar A, Tresnati J, Tuwo A. 2021. Short Communication: Using ecological parameters to assess the sustainability of mangrove ecotourism in Jeneponto, South Sulawesi, Indonesia. Biodiversitas 22: 3571-3577. Mangrove forest is an essential ecosystem that provides various ecosystem services. Among various land use management in mangrove areas, ecotourism is considered as a sustainable economic activity that can improve socio-economic benefits while conserving the mangrove ecosystem. Therefore, ecotourism management must refer to sustainable development principles. This study aims to assess the sustainability status of mangrove forests in Idaman Mangrove Ecotourism in Balang Baru Village, Tarowang Sub-district, Jeneponto District, South Sulawesi, Indonesia using some parameters including the extent, density and diversity of mangrove vegetation, tidal height and animal biota that occurred in the mangroves. The study used line transect method and quadrat transect, and the data were analyzed using Rapfish (Rapid Appraisal for Fisheries) method. The study indicated that the sustainability status of IME for the ecological dimension was in the entirely sustainable category with an ecological dimension value was 58.50. While the mangrove is currently managed sustainably, to go further, it requires all stakeholders' cooperation in improving the dimensions of sustainability, which had a low value, especially the mangrove trees thickness.