Pub Date : 2023-06-30DOI: 10.47125/jesam/2023_1/03
Kathreena Engay-Gutierrez, M. Espaldon, C. Tiburan, Jr., Jessica Villanueva-Peyraube, D. Macandog, Marisa J. Sobremisana
Litsea leytensis Merr. is an endemic and premium hardwood species in the Philippines used for wood carving. It is a threatened species that survival in the wild is impossible with persistent causal factors. The study estimated the species probability of occurrence in Laguna and Quezon based on local knowledge, published records of species distribution, and environmental variables using the Maximum Entropy (MaxEnt) model. Six pre-models were generated: one climatic model, four partial models of variable groups combined with climatic variables, and one full model with 31 original variables. The Final model had 19 highly correlated variables after variable selection and reduction using Jackknife and multi-collinearity tests. Analysis of variable importance revealed that L. leytensis’ occurrence was mostly determined by climatic (62.0%), edaphic (21.76%), and anthropogenic variables (9.53%), while topographic (5.15%) and vegetation-related variables (1.34%) had lesser contributions. The Area Under the Receiver Operating Characteristic Curve (AUC) and True Skill Statistics (TSS) measured model accuracy; and the Final model performed best at AUC = 0.9489 and TSS = 0.7175. Modeling species probability of occurrence could help key sectors in Laguna and Quezon to formulate appropriate conservation strategies for L. leytensis as a reforestation and industrial tree plantation species.
{"title":"Predicting Species Occurrence of Litsea leytensis Merr. in the Provinces of Laguna and Quezon, Philippines","authors":"Kathreena Engay-Gutierrez, M. Espaldon, C. Tiburan, Jr., Jessica Villanueva-Peyraube, D. Macandog, Marisa J. Sobremisana","doi":"10.47125/jesam/2023_1/03","DOIUrl":"https://doi.org/10.47125/jesam/2023_1/03","url":null,"abstract":"Litsea leytensis Merr. is an endemic and premium hardwood species in the Philippines used for wood carving. It is a threatened species that survival in the wild is impossible with persistent causal factors. The study estimated the species probability of occurrence in Laguna and Quezon based on local knowledge, published records of species distribution, and environmental variables using the Maximum Entropy (MaxEnt) model. Six pre-models were generated: one climatic model, four partial models of variable groups combined with climatic variables, and one full model with 31 original variables. The Final model had 19 highly correlated variables after variable selection and reduction using Jackknife and multi-collinearity tests. Analysis of variable importance revealed that L. leytensis’ occurrence was mostly determined by climatic (62.0%), edaphic (21.76%), and anthropogenic variables (9.53%), while topographic (5.15%) and vegetation-related variables (1.34%) had lesser contributions. The Area Under the Receiver Operating Characteristic Curve (AUC) and True Skill Statistics (TSS) measured model accuracy; and the Final model performed best at AUC = 0.9489 and TSS = 0.7175. Modeling species probability of occurrence could help key sectors in Laguna and Quezon to formulate appropriate conservation strategies for L. leytensis as a reforestation and industrial tree plantation species.","PeriodicalId":15657,"journal":{"name":"Journal of Environmental Science and Management","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42751781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.47125/jesam/2023_1/08
Jessa Aquino, Eunice Faith Roa, Maria Helen F. Dayo, Catherine B Gigantone, P. A. Sanchez
Increasing population and growing commercial and business establishment translate to rising demand for water. Water is a finite resource needing proper management to continuously provide humans’ basic needs. In the Philippines, the most populated municipality in the northernmost island province, Basco, Batanes, is highly dependent on Racuaranum Spring within Mt. Iraya watershed as its source of water. The municipality faces challenges with its water resource management coupled with the growing water demand from households, commercial establishments, institutions, and tourism. The water utilization of these sectors were recorded and a 10-year projection of their demand and supply were plotted. Sectoral survey, focus group discussion, and the strengths, weaknesses, opportunities, and threats analysis were employed to assess their water consumption and utilization. The households extract water for general use from groundwater and from the watershed. The other sectors mostly sourced their water through the Basco Waterworks System (BWWS). With the growing number of water consumers, the demand-supply projection showed a high-water demand in the domestic and commercial sectors surpassing actual and potential supply. To address this, the study suggested enactment of municipal ordinances on proper water resource management and service facilities taking into consideration its growing commercial sector, including but not limited to its tourism industry.
{"title":"Water Consumption and Utilization of Various Sectors in Basco, Batanes, Philippines","authors":"Jessa Aquino, Eunice Faith Roa, Maria Helen F. Dayo, Catherine B Gigantone, P. A. Sanchez","doi":"10.47125/jesam/2023_1/08","DOIUrl":"https://doi.org/10.47125/jesam/2023_1/08","url":null,"abstract":"Increasing population and growing commercial and business establishment translate to rising demand for water. Water is a finite resource needing proper management to continuously provide humans’ basic needs. In the Philippines, the most populated municipality in the northernmost island province, Basco, Batanes, is highly dependent on Racuaranum Spring within Mt. Iraya watershed as its source of water. The municipality faces challenges with its water resource management coupled with the growing water demand from households, commercial establishments, institutions, and tourism. The water utilization of these sectors were recorded and a 10-year projection of their demand and supply were plotted. Sectoral survey, focus group discussion, and the strengths, weaknesses, opportunities, and threats analysis were employed to assess their water consumption and utilization. The households extract water for general use from groundwater and from the watershed. The other sectors mostly sourced their water through the Basco Waterworks System (BWWS). With the growing number of water consumers, the demand-supply projection showed a high-water demand in the domestic and commercial sectors surpassing actual and potential supply. To address this, the study suggested enactment of municipal ordinances on proper water resource management and service facilities taking into consideration its growing commercial sector, including but not limited to its tourism industry.","PeriodicalId":15657,"journal":{"name":"Journal of Environmental Science and Management","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45011363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.47125/jesam/2023_1/01
Peter David Kulyakwave, Shiwei Xu, Yunying Wen
Rural farmers are facing different challenges, resulting from climate change and weather variability, which pose threats in crop production and productivity. Small scale farmers try to cope with the prevailing situations by adjusting to different mechanisms including adopting irrigation services. This study seeks to determine the factors influencing rice farmers’ decision to adopt irrigation technology and find out the significant contribution of irrigation to rice yields in the Mbeya Region of Tanzania. Data were collected through structured questionnaires, interviews, and focus group discussions. Data analyses were performed by using descriptive statistics, logistic regression, and ordinary least square (OLS) regression by STATA (v13). The descriptive statistics characterized households’ socio-demographic and economic characteristics. Logistic regression results affirmed that households’ education, labor size, meteorological information, access to financial services, extension services and previous farm outputs significantly influenced irrigation adoption by farmers. Results from OLS regression confirmed that irrigation significantly contributed about 3.2 % to rice yield at P>0.05 level. The study recommends the adoption of irrigation technology in Tanzania as means of coping strategy to the negative impact of climate change and weather variations.
{"title":"Climate and Socio-economic Factors Affecting the Adoption of Irrigation Practices for Improved Rice Yield in Mbeya Region, Tanzania","authors":"Peter David Kulyakwave, Shiwei Xu, Yunying Wen","doi":"10.47125/jesam/2023_1/01","DOIUrl":"https://doi.org/10.47125/jesam/2023_1/01","url":null,"abstract":"Rural farmers are facing different challenges, resulting from climate change and weather variability, which pose threats in crop production and productivity. Small scale farmers try to cope with the prevailing situations by adjusting to different mechanisms including adopting irrigation services. This study seeks to determine the factors influencing rice farmers’ decision to adopt irrigation technology and find out the significant contribution of irrigation to rice yields in the Mbeya Region of Tanzania. Data were collected through structured questionnaires, interviews, and focus group discussions. Data analyses were performed by using descriptive statistics, logistic regression, and ordinary least square (OLS) regression by STATA (v13). The descriptive statistics characterized households’ socio-demographic and economic characteristics. Logistic regression results affirmed that households’ education, labor size, meteorological information, access to financial services, extension services and previous farm outputs significantly influenced irrigation adoption by farmers. Results from OLS regression confirmed that irrigation significantly contributed about 3.2 % to rice yield at P>0.05 level. The study recommends the adoption of irrigation technology in Tanzania as means of coping strategy to the negative impact of climate change and weather variations.","PeriodicalId":15657,"journal":{"name":"Journal of Environmental Science and Management","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44431639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.47125/jesam/2023_1/05
E. Faweya, M. Ayeni, T. Adewumi, O. Faweya
The distribution of radionuclides and heavy metals (carcinogenic and non-carcinogenic) in soil and plants grown in lead contaminated areas were determined using gamma spectrometry and AAS (Atomic Absorption Spectrometry). The values of Dout (outdoor dose rate) and Din (indoor dose rate) were found to vary from 49.10 to 96.59 nGy h-1 with a mean value of 73.75 nGy h-1 and 97.30 to 191.67 nGy h-1 with a mean value of 143.39 nGy h-1 for Kawo; 51.64 to 105.26 nGy h-1 with a mean value of 75.36 nGy h-1 and 104.43 to 205. 87 nGy h-1 with a mean value of 157.13 nGy h-1 for Magiro. The weighted mean concentrations of Pb, Cu, Fe, Cr, Cd and Ni in mg kg-1 in soil and crop were (2.20,2.29), (3.14, 0.16), (15.10, 19.33), (0.16, 0.25), (0.24, 0.05), (0.43, 0.06) and (3.00, 3.18), (6.09, 0.34), (16.83, 10.10), (0.22,0.36), (0.25, 0.05), (0.43, 0.06) for Kawo and Magiro respectively. The total incremental lifetime cancer risk ΣILCR for both adults (0.73 x 10-2) and children (1.03 x 10-2) were above tolerable acceptable risk (given as 1 x 10-6 to 1 x 10-4). Therefore, the areas need remedial action and proper monitoring.
{"title":"Environmental and Health Impacts: Presence of Radionuclides and Toxic Metals in Mining Areas in Niger State, Nigeria","authors":"E. Faweya, M. Ayeni, T. Adewumi, O. Faweya","doi":"10.47125/jesam/2023_1/05","DOIUrl":"https://doi.org/10.47125/jesam/2023_1/05","url":null,"abstract":"The distribution of radionuclides and heavy metals (carcinogenic and non-carcinogenic) in soil and plants grown in lead contaminated areas were determined using gamma spectrometry and AAS (Atomic Absorption Spectrometry). The values of Dout (outdoor dose rate) and Din (indoor dose rate) were found to vary from 49.10 to 96.59 nGy h-1 with a mean value of 73.75 nGy h-1 and 97.30 to 191.67 nGy h-1 with a mean value of 143.39 nGy h-1 for Kawo; 51.64 to 105.26 nGy h-1 with a mean value of 75.36 nGy h-1 and 104.43 to 205. 87 nGy h-1 with a mean value of 157.13 nGy h-1 for Magiro. The weighted mean concentrations of Pb, Cu, Fe, Cr, Cd and Ni in mg kg-1 in soil and crop were (2.20,2.29), (3.14, 0.16), (15.10, 19.33), (0.16, 0.25), (0.24, 0.05), (0.43, 0.06) and (3.00, 3.18), (6.09, 0.34), (16.83, 10.10), (0.22,0.36), (0.25, 0.05), (0.43, 0.06) for Kawo and Magiro respectively. The total incremental lifetime cancer risk ΣILCR for both adults (0.73 x 10-2) and children (1.03 x 10-2) were above tolerable acceptable risk (given as 1 x 10-6 to 1 x 10-4). Therefore, the areas need remedial action and proper monitoring.","PeriodicalId":15657,"journal":{"name":"Journal of Environmental Science and Management","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41859374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.47125/jesam/2023_1/06
K. Tota-Maharaj, C. Hills
In this climate impacted world, there is an increasing need for countries facing potential water extremes to improve the reuse potential of grey water and storm water. By implementing best management practices for the treatment of stormwater and urban run-off, contaminants can be removed, and the water recycled and reused. The effectiveness of stormwater treatment is impacted by the clogging of equipment or where contaminant storage exceeds performance design. Poorly or untreated stormwater runoff can impact the environment through the release of total dissolved solids (TDS), suspended solids (turbidity), phosphate, ammonia, and elevated chemical and biochemical oxygen demand (COD and BOD, respectively). This study evaluated the hydraulic and environmental performance of gravity flow stormwater filters over a three-year period with the average filter life cycle four months. Six bespoke gravity stormwater filters employing sorbent pillows, and including peat moss, were tested for their effectiveness, including for nitrite and nitrate. An improvement in water quality of 80-98% was recorded. Oil and grease were managed effectively (peat moss and sorbent pillows reduced BOD, COD, color, and turbidity) but not significantly when compared to conventional filter media. The findings demonstrate that stormwater biofilters can be an innovative, low-cost, and sustainable solution for both urban and sub-urban runoff management, addressing water quality and resource quantity challenges.
{"title":"Long-term Environmental Performance of Stormwater Biofiltration Sorption Media in Sustainable Drainage Systems (SuDS)","authors":"K. Tota-Maharaj, C. Hills","doi":"10.47125/jesam/2023_1/06","DOIUrl":"https://doi.org/10.47125/jesam/2023_1/06","url":null,"abstract":"In this climate impacted world, there is an increasing need for countries facing potential water extremes to improve the reuse potential of grey water and storm water. By implementing best management practices for the treatment of stormwater and urban run-off, contaminants can be removed, and the water recycled and reused. The effectiveness of stormwater treatment is impacted by the clogging of equipment or where contaminant storage exceeds performance design. Poorly or untreated stormwater runoff can impact the environment through the release of total dissolved solids (TDS), suspended solids (turbidity), phosphate, ammonia, and elevated chemical and biochemical oxygen demand (COD and BOD, respectively). This study evaluated the hydraulic and environmental performance of gravity flow stormwater filters over a three-year period with the average filter life cycle four months. Six bespoke gravity stormwater filters employing sorbent pillows, and including peat moss, were tested for their effectiveness, including for nitrite and nitrate. An improvement in water quality of 80-98% was recorded. Oil and grease were managed effectively (peat moss and sorbent pillows reduced BOD, COD, color, and turbidity) but not significantly when compared to conventional filter media. The findings demonstrate that stormwater biofilters can be an innovative, low-cost, and sustainable solution for both urban and sub-urban runoff management, addressing water quality and resource quantity challenges.","PeriodicalId":15657,"journal":{"name":"Journal of Environmental Science and Management","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47304611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.47125/jesam/2023_1/02
Cuixia Yan, Lucang Wang, Wei Li
This study based on field measurements of the acoustic objective data of Labrang town, draws a sound level map and depicts the soundscape characteristics from the perspective of space-time. The distribution of sound levels is imbalanced in the old urban area of Labrang town. The spatial characteristics show that the eastern region has higher sound levels than does the western region; the core area, higher than the edge area; and the nodular area, higher than the homogeneous area. In the typical “Tawa” community and temple area, the sound level is low, and there is a high level of sound in the area along the traffic line and the “nodule area”. The spatial distribution of the soundscapes is closely related to the urban functional area and crowd behaviour activities. The time characteristic has an obvious fluctuation and particularity. The changes in sound levels and the characteristic of soundscapes are related to the life rhythms of monks and residents. From the point of view of sound protection in historic and cultural cities, it is necessary to pay attention to the construction of soundscapes in order to optimize the urban functional structure and strengthen the management of the sound environment.
{"title":"Study on the Spatio-temporal Characteristics of Soundscape in Famous Historical and Cultural Towns: a Case Study of Labrang Town, Xiahe County, China","authors":"Cuixia Yan, Lucang Wang, Wei Li","doi":"10.47125/jesam/2023_1/02","DOIUrl":"https://doi.org/10.47125/jesam/2023_1/02","url":null,"abstract":"This study based on field measurements of the acoustic objective data of Labrang town, draws a sound level map and depicts the soundscape characteristics from the perspective of space-time. The distribution of sound levels is imbalanced in the old urban area of Labrang town. The spatial characteristics show that the eastern region has higher sound levels than does the western region; the core area, higher than the edge area; and the nodular area, higher than the homogeneous area. In the typical “Tawa” community and temple area, the sound level is low, and there is a high level of sound in the area along the traffic line and the “nodule area”. The spatial distribution of the soundscapes is closely related to the urban functional area and crowd behaviour activities. The time characteristic has an obvious fluctuation and particularity. The changes in sound levels and the characteristic of soundscapes are related to the life rhythms of monks and residents. From the point of view of sound protection in historic and cultural cities, it is necessary to pay attention to the construction of soundscapes in order to optimize the urban functional structure and strengthen the management of the sound environment.","PeriodicalId":15657,"journal":{"name":"Journal of Environmental Science and Management","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42064911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.47125/jesam/2023_1/04
Mae Flor G Posadas
This research aims to identify threatened bird species in wetland areas and define temporal changes occurring among species based on local observations and experiences. Survey, ethnobiology workshops, key informant interviews and focus group discussions were approaches employed in the collection of primary data from the chosen participants residing in the coastal communities in Central Negros, Philippines. The threatened wetland bird species in these sites are generally perceived as “abundant” as indicated by their perceived common presence. The ten sites also shared two vulnerable species, Egretta eulophotes,locally known as as Tulabong by locals and Anas luzonica called Pato ilahas by the natives. The Numenius madagascariensis is considered endangered and eight near threatened bird species (IUCN Red list), Numenius arquata, Limnodromus semipalmatus, Charadrius peronii, Limosa limosa, Limosa lapponica, Tringa brevipes, Calidris ruficollis and Calidris ferruginea, were validated by locals in almost all of the study sites. However, some threatened species were observed to have disappeared and declined in these areas. An updated list of threatened species found in coastal wetland cities and municipalities in the central area of Negros Occidental was produced that shall serve as basis for crafting relevant programs to properly manage, conserve and develop these wetland areas.
{"title":"Community Validation of Threatened Species in Coastal Wetland Areas of Negros Occidental, Philippines","authors":"Mae Flor G Posadas","doi":"10.47125/jesam/2023_1/04","DOIUrl":"https://doi.org/10.47125/jesam/2023_1/04","url":null,"abstract":"This research aims to identify threatened bird species in wetland areas and define temporal changes occurring among species based on local observations and experiences. Survey, ethnobiology workshops, key informant interviews and focus group discussions were approaches employed in the collection of primary data from the chosen participants residing in the coastal communities in Central Negros, Philippines. The threatened wetland bird species in these sites are generally perceived as “abundant” as indicated by their perceived common presence. The ten sites also shared two vulnerable species, Egretta eulophotes,locally known as as Tulabong by locals and Anas luzonica called Pato ilahas by the natives. The Numenius madagascariensis is considered endangered and eight near threatened bird species (IUCN Red list), Numenius arquata, Limnodromus semipalmatus, Charadrius peronii, Limosa limosa, Limosa lapponica, Tringa brevipes, Calidris ruficollis and Calidris ferruginea, were validated by locals in almost all of the study sites. However, some threatened species were observed to have disappeared and declined in these areas. An updated list of threatened species found in coastal wetland cities and municipalities in the central area of Negros Occidental was produced that shall serve as basis for crafting relevant programs to properly manage, conserve and develop these wetland areas.","PeriodicalId":15657,"journal":{"name":"Journal of Environmental Science and Management","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48044759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.47125/jesam/2023_1/07
Enrico L. Replan, J. Villanueva, J. Sevilla-Nastor, Alon Velasquez, M. Espaldon
Molawin River is experiencing water quality degradation over time. Efforts were made to help rehabilitate this river to maintain its ecology and biodiversity. The main objectives of this research are: to identify and document water filtering plants (riparian flora) both present in terrestrial and aquatic ecosystems in the Molawin River and to pinpoint the sources and community perception that defies the idea of riparian flora species as potential water filtering plants in the Molawin River. Documentation of dense riparian flora present in the Molawin River was conducted in order to study its phytoremediation potential for water purification. A total of 107 morpho-species belonging to 94 genera from 56 families was recorded. The most common flora species was Commelina diffusa, Cyperus flabelliformis and Costus speciosus. A household survey and key informant interview were employed. The idea of riparian flora as a potential water purifying plants is facing four main challenges. First, there is a low conservation interest with the water resource, as this is not the primary source of water for them. Secondly, the presence of anthropogenic factors severely affecting the area. Thirdly, the high rate of encroachment of the invasive plants aggravates the conditions of the river. Finally, the lack of institutional support that can integrate riparian flora species in watershed management and rehabilitation planning.
{"title":"Riparian Vegetation Assessment for Effective Management of Molawin River, Mt. Makiling, Philippines","authors":"Enrico L. Replan, J. Villanueva, J. Sevilla-Nastor, Alon Velasquez, M. Espaldon","doi":"10.47125/jesam/2023_1/07","DOIUrl":"https://doi.org/10.47125/jesam/2023_1/07","url":null,"abstract":"Molawin River is experiencing water quality degradation over time. Efforts were made to help rehabilitate this river to maintain its ecology and biodiversity. The main objectives of this research are: to identify and document water filtering plants (riparian flora) both present in terrestrial and aquatic ecosystems in the Molawin River and to pinpoint the sources and community perception that defies the idea of riparian flora species as potential water filtering plants in the Molawin River. Documentation of dense riparian flora present in the Molawin River was conducted in order to study its phytoremediation potential for water purification. A total of 107 morpho-species belonging to 94 genera from 56 families was recorded. The most common flora species was Commelina diffusa, Cyperus flabelliformis and Costus speciosus. A household survey and key informant interview were employed. The idea of riparian flora as a potential water purifying plants is facing four main challenges. First, there is a low conservation interest with the water resource, as this is not the primary source of water for them. Secondly, the presence of anthropogenic factors severely affecting the area. Thirdly, the high rate of encroachment of the invasive plants aggravates the conditions of the river. Finally, the lack of institutional support that can integrate riparian flora species in watershed management and rehabilitation planning.","PeriodicalId":15657,"journal":{"name":"Journal of Environmental Science and Management","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44296024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-31DOI: 10.47125/jesam/2022_2/07
J. Sevilla-Nastor, M. J. Mozo, Jessica Villanueva-Peyraube
Perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) are organic chemicals which pose concerns in the environment due to their persistence and bioaccumulative properties. This study used Assessment Factors and Species Sensitivities Distributions to derive specific thresholds to protect the ecosystem in the Laguna Lake, Philippines from risks posed by the toxicity of PFOS and PFOA using available ecotoxicity data for local species. For Assessment Factor method, the U.S. Environmental Protection Agency guideline for the narrative Tier II criteria was suitable based on the available toxicity data with calculated maximum concentration threshold for PFOS and PFOA of 0.51 and 0.75 mg L-1, respectively, and continuous maximum concentration values of 0.06 and 0.08 mg L-1, respectively. For the methods using Species Sensitivity Distribution (SSD), PFOS and PFOA thresholds extrapolated using factors for small datasets were 0.046 and 0.088 mg L-1, respectively. Lastly, PFOS and PFOA Hazardous Concentration (HC5) extrapolated from the weighted average SSD model estimates were 0.061 and 0.078 mg L-1, respectively. The results can serve as the first regulatory and risk assessment basis for aquatic ecosystem protection against risks posed by emerging contaminants in the lake.
{"title":"Determination of Perfluorooctanoic Acid and Perfluorooctane Sulfonate Water Quality Criteria for Ecosystem Protection of Laguna Lake, Philippines","authors":"J. Sevilla-Nastor, M. J. Mozo, Jessica Villanueva-Peyraube","doi":"10.47125/jesam/2022_2/07","DOIUrl":"https://doi.org/10.47125/jesam/2022_2/07","url":null,"abstract":"Perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) are organic chemicals which pose concerns in the environment due to their persistence and bioaccumulative properties. This study used Assessment Factors and Species Sensitivities Distributions to derive specific thresholds to protect the ecosystem in the Laguna Lake, Philippines from risks posed by the toxicity of PFOS and PFOA using available ecotoxicity data for local species. For Assessment Factor method, the U.S. Environmental Protection Agency guideline for the narrative Tier II criteria was suitable based on the available toxicity data with calculated maximum concentration threshold for PFOS and PFOA of 0.51 and 0.75 mg L-1, respectively, and continuous maximum concentration values of 0.06 and 0.08 mg L-1, respectively. For the methods using Species Sensitivity Distribution (SSD), PFOS and PFOA thresholds extrapolated using factors for small datasets were 0.046 and 0.088 mg L-1, respectively. Lastly, PFOS and PFOA Hazardous Concentration (HC5) extrapolated from the weighted average SSD model estimates were 0.061 and 0.078 mg L-1, respectively. The results can serve as the first regulatory and risk assessment basis for aquatic ecosystem protection against risks posed by emerging contaminants in the lake.","PeriodicalId":15657,"journal":{"name":"Journal of Environmental Science and Management","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45081350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-31DOI: 10.47125/jesam/2022_2/03
V. Paller, Modesto Bandal, Jr, L. J. Manceras
The contamination of heavy metals in the aquatic environment poses a threat due to its persistence and potential accumulation in aquatic life forms. In order to detect such pollution, the use of organisms as bioindicators was explored. This study investigated the use of fish acanthocephalan parasites as bioindicator of lead (Pb) in a semi-pristine Yambo Lake in San Pablo, Laguna, Philippines. Lake water samples, wild Nile tilapias (Oreochromis niloticus), its acanthocephalan parasites (Acanthogyrus sp.), and Asian clams (Corbicula fluminea) were collected and subjected to Pb concentration detection through heavy metal analysis. Higher accumulated mean concentration levels of Pb is recorded in Acanthogyrus sp. (10.13 mg kg-1), followed by the fish host tissues: liver (6.19 mg kg-1), intestine (2.80 mg kg-1), and muscle (0.75 mg kg-1). An established bioindicator, C. fluminea, only accumulated an average of 0.16 mg kg-1 Pb in its soft tissues. The bioaccumulation capacity of Acanthogyrus sp. to the fish host and water samples were 35 times higher than the liver, 190 times the intestine and 211 times than the muscle. Furthermore, the accumulated Pb in the parasite was 3,015 times higher than C. fluminea in lake water. Among all samples analyzed, Acanthogyrus sp. showed the highest accumulation capacity. These findings provide useful information to the bio indicator potential of this parasite, and that local environment authorities can utilize its sensitivity to detect and monitor traces of heavy metals even in less polluted aquatic environments.
{"title":"Lead Uptake of the Asian Clam (Corbicula fluminea), Nile Tilapia (Oreochromis niloticus) and its Parasite (Acanthogyrus sp.) in Yambo Lake, Laguna, Philippines","authors":"V. Paller, Modesto Bandal, Jr, L. J. Manceras","doi":"10.47125/jesam/2022_2/03","DOIUrl":"https://doi.org/10.47125/jesam/2022_2/03","url":null,"abstract":"The contamination of heavy metals in the aquatic environment poses a threat due to its persistence and potential accumulation in aquatic life forms. In order to detect such pollution, the use of organisms as bioindicators was explored. This study investigated the use of fish acanthocephalan parasites as bioindicator of lead (Pb) in a semi-pristine Yambo Lake in San Pablo, Laguna, Philippines. Lake water samples, wild Nile tilapias (Oreochromis niloticus), its acanthocephalan parasites (Acanthogyrus sp.), and Asian clams (Corbicula fluminea) were collected and subjected to Pb concentration detection through heavy metal analysis. Higher accumulated mean concentration levels of Pb is recorded in Acanthogyrus sp. (10.13 mg kg-1), followed by the fish host tissues: liver (6.19 mg kg-1), intestine (2.80 mg kg-1), and muscle (0.75 mg kg-1). An established bioindicator, C. fluminea, only accumulated an average of 0.16 mg kg-1 Pb in its soft tissues. The bioaccumulation capacity of Acanthogyrus sp. to the fish host and water samples were 35 times higher than the liver, 190 times the intestine and 211 times than the muscle. Furthermore, the accumulated Pb in the parasite was 3,015 times higher than C. fluminea in lake water. Among all samples analyzed, Acanthogyrus sp. showed the highest accumulation capacity. These findings provide useful information to the bio indicator potential of this parasite, and that local environment authorities can utilize its sensitivity to detect and monitor traces of heavy metals even in less polluted aquatic environments.","PeriodicalId":15657,"journal":{"name":"Journal of Environmental Science and Management","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41752694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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