The status of seagrass beds in the coastal county of Lamu, Kenya

Abstract Biodiversity assessments within seagrass beds were conducted in six sites in Lamu, Kenya; namely, Kiweni, Tauzi, Wange, Ntopate, Manda toto and Ngoi. The objective of the assessment was to collect baseline information of the seagrasses of Lamu County in Kenya. Our findings revealed that nine out of the twelve seagrass species found in Kenya were found in the study sites. The dominant seagrass species Thalassodendron ciliatum was found to occur in deeper subtidal areas, while the pioneering species occurred in intertidal shallower areas. Average shoot densities per site ranged from 2.4 ± 1.7 shoots m-2 of Cymodocea serrulata to 1025.9 ± 139.3 shoots m-2 of Syringodium isoetifolium in Ngoi. Canopy heights ranged from 0.1 ± 0.1 cm of Halodule ovalis in Tauzi to 16.3±1.3.5 cm of Syringodium isoetifolium in Ngoi. Although the seagrass species characteristics were much lower than that found in similar mangrove fringed seagrass beds of Gazi Bay, the majority of the fish found in these seagrass areas were invertivores which indicates that these seagrass sites form a refugia for adult fish populations with nursery grounds being located elsewhere. This study forms the first comprehensive assessment of the seagrasses of Lamu and it provides important baseline information on seagrass beds. Such biodiversity information provides important support for decision-making for coastal areas that are targeted for infrastructural development such as Lamu. Biodiversity information of such critical habitats form a critical data base for marine spatial planning and can be used to effectively guide the integration of biodiversity and coastal livelihoods in the sustainable development of Kenya’s coastal areas.

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KAJIAN KOMUNITAS EKOSISTEM LAMUN DI SEMENANJUNG TARABITAN KECAMATAN LIKUPANG BARAT KABUPATEN MINAHASA UTARA

JURNAL PESISIR DAN LAUT TROPIS ◽

10.35800/jplt.9.2.2021.34836 ◽

2021 ◽

Vol 9 (2) ◽

pp. 24

Author(s):

Risandi D Sitaba ◽

Carolus P Paruntu ◽

Billy Theodorus Wagey

Keyword(s):

Species Composition ◽

Percent Cover ◽

Seagrass Beds ◽

Seagrass Species ◽

Thalassia Hemprichii ◽

Enhalus Acoroides ◽

Halophila Ovalis ◽

Halodule Uninervis ◽

Cymodocea Rotundata ◽

Syringodium Isoetifolium

This research was conducted in the waters of Tarabitan Peninsula, West Likupang North Minahasa using quadants transect method. The purpose of this study was to determine the community structure of seagrass found in that waters as initial information for sustainable management seagrass ecosystem . Field observation was conducted to identify the seagrass species, number of individuals/shoots, percent cover for each type of seagrass in those plotting quadrants. The result of this study documented 6 types of seagrass namely, Enhalus acoroides, Thalassia hemprichii, Cymodocea rotundata, Syringodium isoetifolium, Halophila ovalis and Halodule uninervis. The species composition and distribution of seagrass were varied and was dominated by Thalassia hemprichii was the most dominant seagrass species with a relative density of 55.55%, a relative frequency of 33.67%, 39.92% relative cover, an important value index of 129.03%, a diversity index of 1.30 belonging to this condition, moderate, the uniformity index of 0.72 is classified as high and the dominance index of 0.2 is classified as low. Based on Minister of Environment Decree Republic Indonesia No. 200 of 2004 concerning the status of seagrass beds, the condition of the seagrass beds in the waters of Tarabitan Village is classified as rich / healthy with a cover value of ≥ 60. Keywords : Seagrass Community, Species Composition, distribution, Tarabitan Peninsula Penelitian ini dilakukan di perairan Semenanjung Tarabitan Likupang Barat Minahasa Utara dengan menggunakan metode transek kuadran. Tujuan penelitian ini adalah untuk mengetahui struktur komunitas lamun yang terdapat di perairan tersebut sebagai informasi awal untuk pengelolaan lamun secara berkelanjutan. Pengamatan lapangan dilakukan untuk mengidentifikasi jenis lamun, jumlah individu/tegakan, persentase tutupan tiap jenis lamun pada tiap kuadran. Hasil penelitian ini mendokumentasikan 6 jenis lamun yaitu Enhalus acoroides, Thalassia hemprichii, Cymodocea rotundata, Syringodium isoetifolium, Halophila ovalis dan Halodule uninervis. Komposisi jenis dan sebaran lamun bervariasi dan didominasi oleh jenis lamun Thalassia hemprichii merupakan jenis lamun yang paling dominan dengan kerapatan relatif 55,55%, frekuensi relatif 33,67%, tutupan relatif 39,92%, indeks nilai penting 129,03%, indeks keanekaragaman 1,30 tergolong dalam kondisi sedang, indeks keseragaman 0,72 tergolong tinggi dan indeks dominansi 0,2 tergolong rendah. Berdasarkan Keputusan Menteri Lingkungan Hidup Nomor 200 Tahun 2004, kondisi padang lamun di perairan Desa Tarabitan tergolong kaya / sehat dengan nilai tutupan ≥ 60.Kata Kunci: Komunitas Lamun, Komposisi Jenis, Distribusi, Semenanjung Tarabitan

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KEANEKARAGAMAN SPESIES LAMUN DI KABUPATEN BANGKA SELATAN PROVINSI KEPULAUAN BANGKA BELITUNG

EnviroScienteae ◽

10.20527/es.v14i1.4889 ◽

2018 ◽

Vol 14 (1) ◽

pp. 21

Author(s):

Dwi Rosalina ◽

Endang Yuli Herawati ◽

Yenny Risjani ◽

Muhammad Musa

Keyword(s):

Seagrass Beds ◽

Seagrass Species ◽

Chemical Parameters ◽

Thalassia Hemprichii ◽

Coverage Area ◽

Seagrass Ecosystem ◽

Halodule Uninervis ◽

Cymodocea Rotundata ◽

Syringodium Isoetifolium ◽

Cymodocea Serrulata

Marine area which is planted by seagrass called as seagrass beds. Seagrass is one of the typical ecosystems in marine waters. Bangka Belitung Province is one of the areas in Indonesia that has seagrass ecosystem. This study aims to determine the diversity, density, and coverage area of seagrass beds in the waters of South Bangka Regency. The research was conducted in Tukak, Tanjung Kerasak, and Tanjung Kemirai. The data is collected using quadratic transect method and also data of physics-chemical parameters such as temperature, salinity, pH, depth, velocity and water substrate. The results of the research showed that 7 species of seagrasses in South Bangka Regency are Cymodocea serrulata, Cymodocea rotundata, Halodule uninervis, Enhalus acoroides, Thalassia hemprichii, Syringodium isoetifolium and Halophila minor. Seagrass in Lempeng waters which has the highest density is Cymodocea serrulata, about 58 ind/m2. The highest frequency of seagrass species in Tukak is Thalassia hemprichii about 1%. Seagrass species of Cymodocea serrulata has the highest cover percentage in Lempeng waters about 29.56%.

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The status of seagrass communities in the Truong Sa archipelago

Tạp chí Khoa học và Công nghệ Biển ◽

10.15625/1859-3097/20/3/15076 ◽

2020 ◽

Vol 20 (3) ◽

pp. 285-295

Author(s):

Cao Van Luong ◽

Nguyen Manh Linh ◽

Vu Manh Hung ◽

Dam Duc Tien ◽

Dau Van Thao ◽

...

Keyword(s):

New Record ◽

Marine Ecosystems ◽

Distribution Area ◽

Seagrass Beds ◽

Seagrass Species ◽

The Status ◽

Survey Results

Seagrasses in Truong Sa archipelago have not been intensively studied and understood, even in some obviously progressive works recently published. It is essential to carry out much more researches to fill up understanding gaps of seagrasses in the area. In 2019, within the framework of the project coded KC09.29/16–20, two surveys were conducted for three selected islands (Truong Sa Lon, Thuyen Chai and Song Tu Tay) in the area, focusing on marine ecosystems including seagrass beds. Survey results in the selected islands show eight seagrass species (one new record), the estimated total distribution area of 1,190 ha, the total reserve of biomass reaching 7,417.2 tons.dry, equivalent to 11,432.8 tons.CO2.

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Study on Composition of Zoobenthos in Coastal Areas, Thai Binh Province

VNU Journal of Science Natural Sciences and Technology ◽

10.25073/2588-1140/vnunst.4686 ◽

2017 ◽

Vol 33 (4) ◽

Author(s):

Ngo Xuan Nam

Keyword(s):

Diversity Index ◽

Coastal Areas ◽

Study Sites

The zoobenthos samples were collected in 30 collecting sections from 02nd to 13th June and from 02nd to 13th October 2014. Investigation of species compositon of zoobenthos in coastal areas, Thai Binh province was identified 72 species belonging to 56 genera of 33 families, 14 orders, 4 classes (Gastropoda, Bivalvia, Crustacea, Polychaeta), 3 phyla (Mollusca, Arthropoda, Annelida). In particular, Mollusca was by far the most popular with 46 species, accounting for roughly 63.8%, compared to the figure of Arthropoda was 23 species, occupying approximately 31.9%, Annelida was 3 species, occupying approximately 4.3%. The density of zoobenthos at the sampling sites averaged from 17 to 420 individuals/m2. The Shannon-Weiner (H') diversity index at the study sites averaged from 2.13 to 3.63.

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Rapid Assessment Of Taal Volcano Protected Landscape (TVPL) Terrestrial Biodiversity

10.26757/pjsb.2017a11007 ◽

2017 ◽

Vol 11 (1) ◽

Keyword(s):

Animal Species ◽

Rapid Assessment ◽

Ecological Status ◽

Taal Volcano ◽

Ecological Barriers ◽

Floral Diversity ◽

Forested Areas ◽

Baseline Information ◽

Study Sites ◽

Terrestrial Biodiversity

With the exponential rise of human activities in the past decades, majority of studies conducted in Taal Volcano Protected Landscape (TVPL) are geared towards the conservation and preservation of Lake Taal’s remaining biodiversity. However, the current structure and assemblage of its terrestrial biotic communities remain relatively unstudied. In this study, we conducted biodiversity censuses in the four sites in TVPL to provide baseline information regarding the community structure of the selected study sites. Comparison of the plant diversity in Taal Volcano Crater Island and Romandan Falls within the forested areas of Mataas na Kahoy, Batangas reveal that both sites support remarkably different vegetation, with the former supporting a smaller floral diversity. The fairly small number of animal samples present difficulty in providing conclusive findings to the wildlife structure of the two study sites. However, the presence of 11 animal species exhibit valuable results in determining the ecological status of TVPL. It is deduced that several ecological barriers exist between the sites, which is attributed to their unique terrestrial biota.

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A Preliminary Assessment on the Herpetofaunal Diversity of the Taal Volcano Protected Landscape (TVPL), Batangas Philippines

10.26757/pjsb.2017a11006 ◽

2017 ◽

Vol 11 (1) ◽

Keyword(s):

Endemic Species ◽

The Philippines ◽

Ecological Community ◽

Preliminary Assessment ◽

Taal Volcano ◽

Reptile Species ◽

Frog Species ◽

Increasing Trend ◽

Baseline Information ◽

Study Sites

The Taal Volcano Protected Landscape (TVPL) encompasses a prehistoric volcano caldera that caters to many documented endemic species. Although regarded as a unique area with the potential to house a diverse ecological community, biodiversity research in TVPL is still found wanting. The present paper aims to provide baseline information and increase research interests on the herpetofaunal diversity of TVPL, in light of its many undocumented terrestrial faunal species. Twelve study sites within the municipalities of Tanauan, Mataasnakahoy, and Balete were visited during survey trips from May to November 2015. A combination of transect and opportunistic sampling techniques were utilized, with morphometric data and sexual maturity recorded for each specimen collected. This preliminary survey provided 24 newly documented species of amphibians and reptiles occurring within TVPL. A total 10 frog species (from families Bufonidae, Ceratobatrachidae, Microhylidae, Dicroglossidae, Ranidae, and Rhacophoridae) and 14 reptile species (from families Agamidae, Gekkonidae, Scincidae, Varanidae, Acrochordidae, Colubridae, Elapidae, and Tryonychidae) were documented. Of the reptiles recorded, 3 are endemic species and widespread throughout the Philippines: Gekko mindorensis, Hydrosaurus pustulatus, and Draco spilopterus. Also recorded were the Philippine endemic frogs Kaloula picta and Limnonectes woodworthi along with the Luzon endemics Platymantis mimulus and Varanus marmoratus. The species-effort curve of amphibians showed a distinct plateau whereas the species-effort curve of reptiles has shown an increasing trend suggesting that additional sampling efforts should be done in the area to further increase knowledge of the TVPL herpetofaunal diversity.

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Seagrass surveys in Shwe Thaung Yan coastal areas, the southern part of Rakhine Coastal Region, Myanmar: biodiversity, coverage and biomass

Journal of Aquaculture & Marine Biology ◽

10.15406/jamb.2019.08.00248 ◽

2019 ◽

Vol 8 (3) ◽

pp. 105-112

Author(s):

Thu- Rein

Keyword(s):

Seasonal Variations ◽

Seagrass Meadow ◽

Monsoon Season ◽

Coastal Region ◽

Coastal Areas ◽

Dry Season ◽

Percent Cover ◽

Study Sites ◽

Seagrass Coverage

Studies on percent cover and biomass of seagrasses from Shwe Thaung Yan coastal areas (Inn Din Gyi, Kyauk Nagar and Phoe Htaung Gyaing), the Southern parts of Rakhine Coastal Region, were carried out between March and August, 2018. A total of 8 species of seagrasses, namely Syringodiumisoetifolium (Ascherson) Danty, Halodulepinifolia (Miki) den Hartog, Haloduleuninervis (Forsskal) Ascherson, Cymodocearotundata Ehrenberg et Hemprich ex Ascherson, C. serrulata (R. Brown) Ascherson et Magnus, Thalassiahemprichii(Ehrenberg) Ascherson, Halophila major (Zoll.) Miquel and Enhalusacoroides (Linnaeus f.) Royle, were recorded in three study sites. Seagrass meadow in this study showed seasonal variations in both percent cover and biomass. Total seagrass coverage and biomass were higher in the dry season than in the monsoon season. Total seagrass coverage ranged between 8% and 75% in Phoe Htaung Gyaing, between 10% and 42% in Kyauk Nagar, and between 15% and 43% in Inn Din Gyi. Total seagrass mean biomass was 50.2413-259.846gdry.wtm-2 in Phoe Htaung Gyaing, 63.0194 -321.535gdry.wtm-2 in Kyauk Nagar, and 98.6819-416.237gdry.wtm-2 in Inn Din Gyi.

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Evaluating Sustainable Development of Land Resources in the Yangtze River Economic Belt of china

Journal of Global Information Management ◽

10.4018/jgim.285585 ◽

2022 ◽

Vol 30 (6) ◽

pp. 0-0

Keyword(s):

Sustainable Development ◽

Spatial Correlation ◽

Yangtze River ◽

Land Development ◽

Active Regions ◽

The Yangtze River ◽

The Sustainable Development ◽

Spatial Differences ◽

The Status ◽

Development Levels

The Yangtze River Economic Belt (YREB) is one of the most economically active regions in China, where an imbalance between the demand for land and the non-renewable is increasingly prominent. We present the patterns of land use in the YREB, then construct an evaluation index based on the Pressure-State-Response model. The TOPSIS model is used to evaluate sustainable land development in the YREB, and the spatial deductive characteristics of sustainable development levels are analyzed using three aspects: global spatial correlation, local spatial correlation, and regional difference. The results about the YREB show that: (1) The comprehensive sustainable land development score is average, indicating moderate sustainability with a fluctuating upward trend and good prospects. (2) The sustainable development levels of land have strong positive spatial correlation and agglomeration; the agglomeration characteristics follow a pattern similar to that of the status of economic development. (3) Sustainable development levels of land in the provinces and cities show great spatial differences.

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Promoting Cooperation of Monitoring, Control, and Surveillance of IUU Fishing in the Asia-Pacific

Sustainability ◽

10.3390/su131810231 ◽

2021 ◽

Vol 13 (18) ◽

pp. 10231

Author(s):

Iwao Fujii ◽

Yumi Okochi ◽

Hajime Kawamura

Keyword(s):

Literature Review ◽

Coastal Areas ◽

Asia Pacific ◽

Sustainable Fisheries ◽

Communication Platform ◽

Iuu Fishing ◽

Fishing Vessels ◽

Vessel Tracking ◽

The Status ◽

Current Systems

Illegal, unreported, and unregulated (IUU) fishing is becoming a growing threat to sustainable fisheries and the economy worldwide. To solve this issue, various efforts on monitoring, control, and surveillance (MCS) have been made at the national, regional, and international levels. However, there is still the lack of measures against IUU fishing vessels at the multilateral level. Here, we assessed the situations of fisheries, and the current systems and challenges of MCS in eight Asia-Pacific countries with a focus on MCS of IUU fishing vessels at sea. Through a literature review and interviews, we confirmed that IUU fishing was linked with the status of fisheries in each country, and that each country implements various MCS measures with different emphases. However, there was a trend of enhancing or newly establishing four areas of MCS: vessel tracking, patrol, onboard observers, and port State measures, with amended or newly adopted laws. We also identified challenges of MCS such as insufficient MCS in coastal areas and fragmented cooperation among the countries. Based on our findings, we advance several recommendations including the enhancement of cooperation among stakeholders, especially fishers, for co-monitoring in coastal areas and the establishment of a communication platform for Asia-Pacific countries.

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Vulnerability of coastal areas to increased aquifer saturation due to climate change

10.5194/egusphere-egu21-14870 ◽

2021 ◽

Author(s):

Alexandre Gauvain ◽

Ronan Abhervé ◽

Jean-Raynald de Dreuzy ◽

Luc Aquilina ◽

Frédéric Gresselin

Keyword(s):

Climate Change ◽

Sea Level ◽

Large Scale ◽

Regional Scale ◽

Drainage System ◽

Hydrological Regime ◽

Coastal Areas ◽

Western Coast ◽

Study Sites ◽

The Impact

Like in other relatively flat coastal areas, flooding by aquifer overflow is a recurring problem on the western coast of Normandy (France). Threats are expected to be enhanced by the rise of the sea level and to have critical consequences on the future development and management of the territory. The delineation of the increased saturation areas is a required step to assess the impact of climate change locally. Preliminary models showed that vulnerability does not result only from the sea side but also from the continental side through the modifications of the hydrological regime.We investigate the processes controlling these coastal flooding phenomena by using hydrogeological models calibrated at large scale with an innovative method reproducing the hydrographic network. Reference study sites selected for their proven sensitivity to flooding have been used to validate the methodology and determine the influence of the different geomorphological configurations frequently encountered along the coastal line.Hydrogeological models show that the rise of the sea level induces an irregular increase in coastal aquifer saturations extending up to several kilometers inland. Back-littoral channels traditionally used as a large-scale drainage system against high tides limits the propagation of aquifer saturation upstream, provided that channels are not dominantly under maritime influence. High seepage fed by increased recharge occurring in climatic extremes may extend the vulnerable areas and further limit the effectiveness of the drainage system. Local configurations are investigated to categorize the influence of the local geological and geomorphological structures and upscale it at the regional scale.

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