scholarly journals Abundance and Diversity of Holothuroids in Shallow Habitats of the Northern Red Sea

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Boaz Yuval ◽  
Lee Sudai ◽  
Yarden Ziv
Keyword(s):  
Coral Reefs ◽  
Protected Areas ◽  
Red Sea ◽  
Marine Protected Areas ◽  
Common Species ◽  
Sea Cucumbers ◽  
Marine Habitats ◽  
Human Use ◽  
Abundance And Diversity ◽  
Northern Red Sea

Holothuroid sea cucumbers are vital members of Coral Reefs and associated marine habitats and provide vital ecological services. In the southern regions of the Red Sea their populations have been decimated by overfishing. The main objective of this study was to test the hypothesis that the northern part of the Red Sea serves as an ecological refuge for the species threatened farther to the south. Accordingly, populations of sea cucumbers in 4 shallow sites south of Eilat, Israel (29°33′00N 34°57′14E), were repeatedly surveyed from November 2013 to April 2014. Overall 11 species were observed in these shallow sites. Their abundance and diversity differed significantly between sites, but not temporally. In sites in marine protected areas, with an intact fringing reef, diversity was high, withHolothuria edulisandBohadschiasp. being the most common species. In areas with higher human use and characterized by rubble and scattered corals, diversity was low, andActinopyga bannwarthiwas the most common species. The observed abundance and diversity did not support the refuge hypothesis. These findings are discussed in relation to other surveys of abundance and diversity in similar habitats.

scholarly journals Tourism Impact on Marine Ecosystems in the North of Red Sea

2019 ◽  
Vol 13 (1) ◽  
pp. 10
Author(s):  
Abderrahim Lakhouit
Keyword(s):  
Coral Reefs ◽  
Red Sea ◽  
Human Activities ◽  
Marine Ecosystems ◽  
Tourism Impact ◽  
The North ◽  
Algae Blooms ◽  
Marine Habitats ◽  
The Impact ◽  
Northern Red Sea

The unique marine environment of the northern Red Sea region is among the richest and most productive marine ecosystems in the world. The sea is populated with extensive algae blooms and at least five types of coral reefs. However, the region’s tourism sector is largely dependent on the surrounding environment, including the coral reefs, which are highly sensitive to human activities. A large tourist project (Neom) is scheduled to be installed in the northern Red Sea, further increasing tourist activities in the area and leading to human intrusion into crucial but fragile marine habitats such as seagrass beds, coral reefs and mangrove stands. The present study investigates how human activities are currently affecting Red Sea ecosystems. Field visits were done in order to investigate and to study human activities impact on marine ecosystems in the north of Red Sea. To the best of our knowledge, this work is the first of its kind to evaluate the impact of tourism on marine ecosystems in Saudi Arabia’s northern Red Sea coast.

scholarly journals Coral Reef Mapping with Remote Sensing and Machine Learning: A Nurture and Nature Analysis in Marine Protected Areas

2021 ◽  
Vol 13 (15) ◽  
pp. 2907
Author(s):  
Camila Brasil Louro da Silveira ◽  
Gil Marcelo Reuss Strenzel ◽  
Mauro Maida ◽  
Ana Lídia Bertoldi Gaspar ◽  
Beatrice Padovani Ferreira
Keyword(s):  
Machine Learning ◽  
Remote Sensing ◽  
Coral Reefs ◽  
Protected Areas ◽  
Marine Protected Areas ◽  
Distribution Model ◽  
Support Vector ◽  
Landsat 8 ◽  
Human Use ◽  
The Impact

Mapping habitats is essential to assist strategic decisions regarding the use and protection of coral reefs. Coupled with machine learning (ML) algorithms, remote sensing has allowed detailed mapping of reefs at meaningful scales. Here we integrated WorldView-3 and Landsat-8 imagery and ML techniques to produce a map of suitable habitats for the occurrence of a model species, the hydrocoral Millepora alcicornis, in coral reefs located inside marine protected areas in Northeast Brazil. Conservation and management efforts in the region were also analyzed, integrating human use layers to the ecological seascape. Three ML techniques were applied: two to derive base layers, namely geographically weighted regressions for bathymetry and support vector machine classifier (SVM) for habitat mapping, and one to build the species distribution model (MaxEnt) for Millepora alcicornis, a conspicuous and important reef-building species in the area. Additionally, human use was mapped based on the presence of tourists and fishers. SVM yielded 15 benthic classes (e.g., seagrass, sand, coral), with an overall accuracy of 79%. Bathymetry and its derivative layers depicted the topographical complexity of the area. The Millepora alcicornis distribution model identified distance from the shore and depth as topographical factors limiting the settling and growth of coral colonies. The most important variables were ecological, showing the importance of maintaining high biodiversity in the ecosystem. The comparison of the habitat suitability model with species absence and human use maps indicated the impact of direct human activities as potential inhibitors of coral development. Results reinforce the importance of the establishment of no-take zones and other protective measures for maintaining local biodiversity.

scholarly journals KONDISI IKAN KARANG FAMILI CHAETODONTIDAE DI DAERAH PERLINDUNGAN LAUT DESA BAHOI KECAMATAN LIKUPANG BARAT KABUPATEN MINAHASA UTARA

2015 ◽  
Vol 2 (3) ◽  
pp. 92
Author(s):  
Jacqline Laikun ◽  
Ari B Rondonuwu ◽  
Unstain N.W.J. Rembet
Keyword(s):  
Spatial Distribution ◽  
Coral Reef ◽  
Coral Reefs ◽  
Protected Areas ◽  
Reef Fish ◽  
Marine Protected Areas ◽  
Visual Census ◽  
Fish Family ◽  
Marine Life ◽  
Reef Condition

The coral reefs are a sundry of marine life. Which one is reef fish in family Chaetodontidae. This fish is  indicator of the coral reef condition. The aim from the research is : discover of spatial distribution of the reef fish family Chaetodontidae and find out of the intercourse of reef fish family Chaetodontidae with the coral reef presence based on growth of coral form. The research was do in the coral reef at Marine Protected Areas in Bahoi Village District of West Likupang North Minahasa Regency, on Tuesday, December 23rd, 2014. The research is using to do the surveying method. The data is collecting distribution of the fish Chaetodontidae (amount from species and individuals to using by technic visual census). The total of reef fish family Chaetodontidae those found in Marina Protected Areas in Bahoi Village is about 20 species, with total of the individuals at a depth of 3 meters and 10 meters is (56,66 and 57,33 individuals/150m2). Keywords : Coral reefs, Chaetodontidae, Bahoi   ABSTRAK Terumbu karang merupakan tempat berbagai macam biota laut. Salah satu Ikan karang adalah ikan famili Chaetodontidae. Ikan ini merupakan ikan indikator terumbu karang. Tujuan dari penelitian ini : mengetahui kelimpahan dari ikan karang famili Chaetodontidae. Penelitian ini dilakukan di Daerah Perlindungan Laut Desa Bahoi Kecamatan Likupang Barat Kabupaten Minahasa Utara, pada hari selasa, tanggal 23 Desember 2014. Penelitian ini menggunakan metode survey. Data yang dikumpulkan adalah kelimpahan ikan Chaetodontidae (Jumlah spesies dan individu dengan menggunakan teknik sensus visual). Jumlah ikan karang famili Chaetodontidae yang di temukan di Daerah Perlindungan Laut Desa Bahoi berjumlah 20 spesies, dengan jumlah individu pada kedalaman 3 meter dan 10 meter berjumlah (56,66 individu/150m2 dan 57,33/150m2 individu). Kata kunci : Terumbu karang, Chaetodontidae, Bahoi 1Bagian dari skripsi 2Mahasiswa Program Studi Manajemen Sumberdaya Perairan FPIK-UNSRAT 3Staf pengajar Fakultas Perikanan dan Ilmu Kelautan Universitas Sam Ratulangi

Coral cover and partial mortality on anthropogenically impacted coral reefs at Eilat, northern Red Sea

2004 ◽  
Vol 48 (3-4) ◽  
pp. 248-253 ◽  
Author(s):  
Jeffrey Wielgus ◽  
Nanette E. Chadwick-Furman ◽  
Zvy Dubinsky
Keyword(s):  
Coral Reefs ◽  
Red Sea ◽  
Coral Cover ◽  
Partial Mortality ◽  
Northern Red Sea

scholarly journals Expanding marine protected areas to include degraded coral reefs

2016 ◽  
Vol 30 (6) ◽  
pp. 1182-1191 ◽  
Author(s):  
A. Abelson ◽  
P.A. Nelson ◽  
G.J. Edgar ◽  
N. Shashar ◽  
D.C. Reed ◽  
...  
Keyword(s):  
Coral Reefs ◽  
Protected Areas ◽  
Marine Protected Areas

scholarly journals Variable effects of local management on coral defenses against a thermally regulated bleaching pathogen

2019 ◽  
Vol 5 (10) ◽  
pp. eaay1048 ◽  
Author(s):  
Deanna S. Beatty ◽  
Jinu Mathew Valayil ◽  
Cody S. Clements ◽  
Kim B. Ritchie ◽  
Frank J. Stewart ◽  
...  
Keyword(s):  
Global Change ◽  
Coral Reefs ◽  
Microbial Communities ◽  
Protected Areas ◽  
Marine Protected Areas ◽  
Coral Bleaching ◽  
Local Management ◽  
Reef Degradation ◽  
Vibrio Coralliilyticus

Bleaching and disease are decimating coral reefs especially when warming promotes bleaching pathogens, such as Vibrio coralliilyticus. We demonstrate that sterilized washes from three common corals suppress V. coralliilyticus but that this defense is compromised when assays are run at higher temperatures. For a coral within the ecologically critical genus Acropora, inhibition was 75 to 154% greater among colonies from coral-dominated marine protected areas versus adjacent fished areas that were macroalgae-dominated. Acropora microbiomes were more variable within fished areas, suggesting that reef degradation may also perturb coral microbial communities. Defenses of a robust poritid coral and a weedy pocilloporid coral were not affected by reef degradation, and microbiomes were unaltered for these species. For some ecologically critical, but bleaching-susceptible, corals such as Acropora, local management to improve reef state may bolster coral resistance to global change, such as bacteria-induced coral bleaching during warming events.

scholarly journals Konservasi dan Kondisi Terumbu Karang di Kampung Saporkren Distrik Waigeo Selatan, Kabupaten Raja Ampat, Papua Barat

2018 ◽  
Vol 5 (2) ◽  
pp. 68-76
Author(s):  
Marthen L.R. Bartholomeus ◽  
Dirk Y.P. Runtuboi ◽  
Rosye H.R. Tanjung
Keyword(s):  
Coral Reef ◽  
Coral Reefs ◽  
Protected Areas ◽  
Flow Velocity ◽  
Marine Protected Areas ◽  
Coral Cover ◽  
Coral Reef Ecosystem ◽  
Village Community ◽  
Papua Barat ◽  
Reef Ecosystem

Conservation effort and knowledge on coral reef ecosystem are necessary to protect marine ecosystem. Coral reef ecosystem is very important to support marine biota especially fishes and benthos. The presence of coral reef indirectly support local people income, therefore is is necessary to conserve coral reef ecosystem. District of South Waigeo is one of tourist area as well as preserve area in Raja Ampat Regency of Papua Barat Province. The aim of this study is to identify the current condition of coral reef in Saporken Village of South waigeo District. Data were collected by survey method using coral reefs Point intercept transect method, observation and interviews to determine the social, economic and cultural impact., and measures taken to manage coral reef management in village Saporkren Marine Protected Areas. The results showed that knowledge Saporkren Village community, the conservation community knows about how destructive such arrests are not carried out the bombing, while the traditional way people work is local wisdom. Condition of coral cover in the village of Marine Protected Areas Saporkren in good condition (live coral cover=51%) and very good water quality, flow velocity at high tide ranged from 4.25 to 22.3 cm/sec and the flow velocity at low tide over small ranging from 5.07 to 19.60 cm/sec, salinity ranged from 32–35‰ and wave height ranged from 0.75 m. Based on the results of this study concluded that: Village community know Saporkren conservation activities of local government programs, and the traditional way to preserve coral reef still implemented.Key words: Conservation, coral reefs, Saporkren village, Raja Ampat. 

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