1
|
Ghabban H, Albalawi DA, Al-otaibi AS, Alshehri D, Alenzi AM, Alatawy M, Alatawi HA, Alnagar DK, Bahieldin A. Investigating the bacterial community of gray mangroves ( Avicennia marina) in coastal areas of Tabuk region. PeerJ 2024; 12:e18282. [PMID: 39434799 PMCID: PMC11493069 DOI: 10.7717/peerj.18282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Accepted: 09/19/2024] [Indexed: 10/23/2024] Open
Abstract
Mangrove vegetation, a threatened and unique inter-tidal ecosystem, harbours a complex and largely unexplored bacterial community crucial for nutrient cycling and the degradation of toxic pollutants in coastal areas. Despite its importance, the bacterial community composition of the gray mangrove (Avicennia marina) in the Red Sea coastal regions remains under-studied. This study aims to elucidate the structural and functional diversity of the microbiome in the bulk and rhizospheric soils associated with A. marina in the coastal areas of Ras Alshabaan-Umluj (Umluj) and Almunibrah-Al-Wajh (Al-Wajh) within the Tabuk region of Saudi Arabia. Amplicon sequencing targeting the 16S rRNA was performed using the metagenomic DNAs from the bulk and rhizospheric soil samples from Umluj and Al-Wajh. A total of 6,876 OTUs were recovered from all samples, of which 1,857 OTUs were common to all locations while the total number of OTUs unique to Al-wajh was higher (3,011 OTUs) than the total number of OTUs observed (1,324 OTUs) at Umluj site. Based on diversity indices, overall bacterial diversity was comparatively higher in rhizospheric soil samples of both sites. Comparing the diversity indices for the rhizosphere samples from the two sites revealed that the diversity was much higher in the rhizosphere samples from Al-Wajh as compared to those from Umluj. The most dominant genera in rhizosphere sample of Al-Wajh were Geminicoccus and Thermodesulfovibrio while the same habitat of the Umluj site was dominated by Propionibacterium, Corynebacterium and Staphylococcus. Bacterial functional potential prediction analyses showed that bacteria from two locations have almost similar patterns of functional genes including amino acids and carbohydrates metabolisms, sulfate reduction and C-1 compound metabolism and xenobiotics biodegradation. However, the rhizosphere samples of both sites harbour more genes involved in the utilization and assimilation of C-1 compounds. Our results reveal that bacterial communities inhabiting the rhizosphere of A. marina differed significantly from those in the bulk soil, suggesting a possible role of A. marina roots in shaping these bacterial communities. Additionally, not only vegetation but also geographical location appears to influence the overall bacterial composition at the two sites.
Collapse
Affiliation(s)
- Hanaa Ghabban
- Department of Biology, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
- Biodiversity Genomics Unit, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
| | - Doha A. Albalawi
- Department of Biology, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
- Biodiversity Genomics Unit, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
| | - Amenah S. Al-otaibi
- Department of Biology, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
- Biodiversity Genomics Unit, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
| | - Dikhnah Alshehri
- Department of Biology, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
- Biodiversity Genomics Unit, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
| | - Asma Massad Alenzi
- Department of Biology, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
- Biodiversity Genomics Unit, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
| | - Marfat Alatawy
- Department of Biology, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
- Biodiversity Genomics Unit, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
| | - Hanan Ali Alatawi
- Department of Biological Sciences, University Collage of Haqel, University of Tabuk, Tabuk, Saudi Arabia
| | - Dalia Kamal Alnagar
- Department of Statistics, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
| | - Ahmad Bahieldin
- Department of Biological Sciences, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
- Department of Genetics, Faculty of Agriculture, Ain Shams University, Cairo, Egypt
| |
Collapse
|
2
|
Zeng J, Ai B, Jian Z, Zhao J, Sun S. Simulation of mangrove suitable habitat in the Guangdong-Hong Kong-Macao Area under the background of climate change. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 351:119678. [PMID: 38043307 DOI: 10.1016/j.jenvman.2023.119678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 09/24/2023] [Accepted: 11/20/2023] [Indexed: 12/05/2023]
Abstract
Climate change has resulted in great influence on the geographical distribution of species. Mangrove forests are one of the most precious ecosystems on the planet, yet they are being threatened by the habitat destruction and degradation under the situation of global warming. Seeking suitable areas for planting mangroves to tackle climate change has been gradually popular in ecological restoration. In this study, we applied the Maximum Entropy algorithm to assess the contribution of environmental factors on mangrove distribution, simulated mangrove suitable habitat for present and future (scenario of SSP245-2070s), and used kernel density analysis for identifying priority of mangrove reserve construction. Results indicate that mean diurnal range and elevation made the highest contribution on mangrove distribution. At present, the mangrove habitat suitability along the western coast of the Guangdong-Hong Kong-Macao Area (GHMA) was the highest while that along the eastern coast was the lowest. By 2070s, mangrove suitable areas would show a decreasing trend under SSP245 scenario. High suitable areas (HSAs) would change fastest and shift to northeast in the same direction as dominant environmental factors. For further mangrove restoration, it is advisable to select sites with high suitability density in the future but low reclamation density at present as prior mangrove reserves, and these sites distribute along the northeastern and northwestern coast of Zhanjiang, Yangjiang and Jiangmen, the Pearl River Estuary and Honghai Bay of Shanwei. Meanwhile, regions with lower suitability density but higher reclamation density could be listed as secondary mangrove reserves.
Collapse
Affiliation(s)
- Jiali Zeng
- School of Marine Sciences, Sun Yat-sen University, Zhuhai, 519082, Guangdong, PR China
| | - Bin Ai
- School of Marine Sciences, Sun Yat-sen University, Zhuhai, 519082, Guangdong, PR China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519000, Guangdong, PR China; Pearl River Estuary Marine Ecosystem Research Station, Ministry of Education, Zhuhai, 519000, Guangdong, PR China; Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou, 510275, Guangdong, PR China.
| | - Zhuokai Jian
- School of Marine Sciences, Sun Yat-sen University, Zhuhai, 519082, Guangdong, PR China
| | - Jun Zhao
- School of Marine Sciences, Sun Yat-sen University, Zhuhai, 519082, Guangdong, PR China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519000, Guangdong, PR China; Pearl River Estuary Marine Ecosystem Research Station, Ministry of Education, Zhuhai, 519000, Guangdong, PR China; Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou, 510275, Guangdong, PR China
| | - Shaojie Sun
- School of Marine Sciences, Sun Yat-sen University, Zhuhai, 519082, Guangdong, PR China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519000, Guangdong, PR China; Pearl River Estuary Marine Ecosystem Research Station, Ministry of Education, Zhuhai, 519000, Guangdong, PR China; Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou, 510275, Guangdong, PR China
| |
Collapse
|
3
|
Baubekova A, Ahrari A, Etemadi H, Klöve B, Haghighi AT. Environmental flow assessment for intermittent rivers supporting the most poleward mangroves. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 907:167981. [PMID: 37866602 DOI: 10.1016/j.scitotenv.2023.167981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 09/20/2023] [Accepted: 10/19/2023] [Indexed: 10/24/2023]
Abstract
The most vulnerable and dynamic ecosystems in terms of response to climate change and fluctuations in hydrological conditions are mangroves, particularly those located on the edge of their latitudinal range limits. The four primary Iranian mangrove forest sites: Nayband, Qeshm, Gabrik, and Govatr, located in the northern part of the Persian Gulf and the Gulf of Oman already exist near the limit of their tolerance to extreme temperature, precipitation, and salinity. Due to extreme climate conditions at these locations, the mangrove trees are usually smaller and less dense as compared with mangroves closer to the equator complicating their monitoring and mapping efforts. Despite the growing attention to the ecological benefits of mangrove forests and their importance in climate change mitigation, there are still a few studies on these marginal mangroves. Therefore, we investigated whether the variation in mangrove ecosystem health is related to the changes in physical parameters and differs between estuarine and sea-side locations. We developed a comprehensive database on NDVI values, associated rainfall, temperature, and river flow based on in-situ and remote sensing measurements. By understanding the normal hydrologic patterns that control the distribution and growth of mangroves in arid and semi-arid regions, we are questioning the need for environmental flow allocation to restore mangrove ecosystem health. This brings us to the second gap in the literature and the need for further studies on Environmental Flow assessment for intermittent and ephemeral rivers. Alike other mangroves studied, forests showed greenness seasonality, positively correlated with rainfall, and negatively correlated with temperature. As there was no clear difference between estuarine and marine sites, freshwater influence in the form of river flow, unlike temperature, cannot be considered a major limiting factor. Nevertheless, during prolonged droughts mangroves could benefit from the recommended allocation of Environmental Flow during the cold period (November-March).
Collapse
Affiliation(s)
- Aziza Baubekova
- Water, Energy, and Environmental Engineering Research Unit, University of Oulu, Finland.
| | - Amirhossein Ahrari
- Water, Energy, and Environmental Engineering Research Unit, University of Oulu, Finland
| | - Hana Etemadi
- Environmental Science, Persian Gulf Research Institute, Persian Gulf University, Bushehr, Iran
| | - Björn Klöve
- Water, Energy, and Environmental Engineering Research Unit, University of Oulu, Finland
| | - Ali Torabi Haghighi
- Water, Energy, and Environmental Engineering Research Unit, University of Oulu, Finland
| |
Collapse
|
4
|
Reis A, Rovai AS, Lana PDC, Barros F. Mangrove interaction with saltmarsh varies at different life stages. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 905:167410. [PMID: 37769724 DOI: 10.1016/j.scitotenv.2023.167410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Revised: 09/23/2023] [Accepted: 09/25/2023] [Indexed: 10/03/2023]
Abstract
Mangroves and saltmarshes are two of the most relevant coastal habitats for humans. These ecosystems offer several services like coastal protection, climate mitigation, and nursery habitats for many artisanal and commercially exploited fish, crabs, and shellfish. They mostly dominate different latitudinal ranges but in several places around the world they co-occur and interact. Here, we summarize the current scientific knowledge on mangrove-saltmarsh ecological interactions and propose a conceptual model. We screened 1410 articles from 1945 to 2022 and selected 29 experiments that assessed mangrove-saltmarsh ecological interactions. Both positive and negative interactions are observed but there is variation along different mangrove life stages. Higher retention and establishment of mangrove propagules are found inside saltmarshes than on bare flats, i.e. facilitation, and these effects are higher at grass than at succulent saltmarsh species. Mangrove seedlings, saplings, or trees mostly compete with saltmarshes, negatively affecting mangrove growth. We propose a model with different outcomes considering the interaction between different mangrove's life stages and saltmarsh forms and discussed these interactions in the light of anthropogenic threats and climate change.
Collapse
Affiliation(s)
- Alice Reis
- Laboratório de Ecologia Bentônica, IBIO & CIEnAM & INCT IN-TREE, Universidade Federal da Bahia, Rua Barão de Geremoabo, s/n, Campus de Ondina, Salvador, Bahia 40170-000, Brazil.
| | - André Scarlate Rovai
- Department of Oceanography and Coastal Sciences, Louisiana State University, Baton Rouge, LA 70803, USA; U.S. Army Engineer Research and Development Center, Vicksburg, MS 39180, USA
| | - Paulo da Cunha Lana
- Laboratório de Bentos, Centro de Estudos do Mar, Universidade Federal do Paraná, Av. Beira-mar, s/n, Pontal do Paraná, PR 83255-976, Brazil
| | - Francisco Barros
- Laboratório de Ecologia Bentônica, IBIO & CIEnAM & INCT IN-TREE, Universidade Federal da Bahia, Rua Barão de Geremoabo, s/n, Campus de Ondina, Salvador, Bahia 40170-000, Brazil
| |
Collapse
|
5
|
Flores-de-Santiago F, Rodríguez-Sobreyra R, Álvarez-Sánchez LF, Valderrama-Landeros L, Amezcua F, Flores-Verdugo F. Understanding the natural expansion of white mangrove (Laguncularia racemosa) in an ephemeral inlet based on geomorphological analysis and remote sensing data. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 338:117820. [PMID: 37003227 DOI: 10.1016/j.jenvman.2023.117820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 03/22/2023] [Accepted: 03/25/2023] [Indexed: 06/19/2023]
Abstract
The interactions between local tides and river discharges are crucial in the processes related to the recruitment of mangrove propagules in estuarine systems. This investigation aimed to determine the causes of the recent natural recruitment and expansion of Laguncularia racemosa in mudflats within an ephemeral inlet in Mexico. We conducted a fluvial and coastal geomorphology assessment with spaceborne and UAV-based images. We deployed and recorded continuous data loggers in the estuarine system to assess water level and salinity. Depending on the available data, we used a combination of cloud-computing Google Earth Engine, UAV-Digital Surface Models, LiDAR, Google Earth images, and biophysical variables to monitor mangrove forests from 2005 to 2022. When the inlet is open, the estuarine system presents a full tidal range (∼1-1.5 m) with a strong salinity gradient (0-35 mS/cm), in contrast to the strong freshwater influence and minimal water level variability (<10 cm) that prevails for three months when the inlet is closed. Once the mouth of the river closes, there is considerable sediment accumulation, creating mudflat areas adjacent to the mangrove forests where Laguncularia racemosa propagules begin to establish under minimal water level variability and oligohaline conditions. After 16 years, the new forest expanded by 12.3 ha, presenting a very high density (10000 stems/ha), a considerable basal area (54-63 m2/ha), and a maximum canopy height of 15.8 m, which largely surpasses that of other semiarid Laguncularia racemosa forests within permanent open-inlet systems or even in ephemeral inlets with different hydrological conditions. Our study will help to understand the causes of natural Laguncularia racemosa recruitment in extremely dynamic systems.
Collapse
Affiliation(s)
- Francisco Flores-de-Santiago
- Instituto de Ciencias del Mar y Limnología, Unidad Académica Procesos Oceánicos y Costeros, Universidad Nacional Autónoma de México, A.P. 70-305, Av. Universidad 3000, Ciudad Universitaria, Coyoacán, Cd. México, 04510, Mexico.
| | - Ranulfo Rodríguez-Sobreyra
- Instituto de Ciencias del Mar y Limnología, Unidad Académica Procesos Oceánicos y Costeros, Universidad Nacional Autónoma de México, A.P. 70-305, Av. Universidad 3000, Ciudad Universitaria, Coyoacán, Cd. México, 04510, Mexico
| | - León Felipe Álvarez-Sánchez
- Instituto de Ciencias del Mar y Limnología, Unidad de Informática Marina, Universidad Nacional Autónoma de México, A.P. 70-305, Av. Universidad 3000, Ciudad Universitaria, Coyoacán, Cd. México, 04510, Mexico
| | - Luis Valderrama-Landeros
- Subcoordinación de Percepción Remota, Comisión Nacional Para el Conocimiento y Uso de la Biodiversidad, 4903 Liga Periférico-Insurgentes Sur, Tlalpan, Cd. México, 14010, Mexico
| | - Felipe Amezcua
- Instituto de Ciencias del Mar y Limnología, Unidad Académica Mazatlán, Universidad Nacional Autónoma de México, Av. Joel Montes Camarena s/n, Mazatlán, Sin, 82040, Mexico
| | - Francisco Flores-Verdugo
- Instituto de Ciencias del Mar y Limnología, Unidad Académica Mazatlán, Universidad Nacional Autónoma de México, Av. Joel Montes Camarena s/n, Mazatlán, Sin, 82040, Mexico
| |
Collapse
|