Pub Date : 2024-06-03DOI: 10.59120/drj.v15ino.2.193
Jason Pilotos, Yam Nesa Bualan
This study aimed to identify, characterize, and evaluate the biodiversity of shrimp-associated species in abandoned shrimp ponds, specifically assessing the trophic levels of bycatch species in Barangay Dahican, Mati City. Using a scoop net, researchers collected macrobenthic samples from Maitum, Lahusan, and Butuasan, finding 1,528 individuals with varying species compositions namely: Oreochromis niloticus (Nile tilapia), Coenobita cavipes (Land hermit crab), Canarium labiatum (Plicate conch), Rochia nilotica (Commercial top), Clithon oualaniense (Guamanian nerite), Cerithium coralium (Coral cerith), and Callinectes sapidus (Blue crab). Cerithium coralium was the most abundant species with 70% relative abundance, followed by Clithon oualaniense, with 29%. In contrast, the least abundant species were the Oreochromis niloticus and Canarium labiatum, with 1% relative abundance. Moreover, biodiversity indices revealed that Lahusan 1 (H' = 0.731; D=0.46) and Butuasan (H' = 0.714; D = 0.5) had higher biodiversity, whereas Lahusan 2 had the lowest (H' = 0.318; D = 0.15). In contrast, Lahusan 2 appeared to be the least diverse (H' = 0.318; D = 0.15). There were significant differences in terms of species abundance (df = 6, MS = 34.18, F = 6.02, P = 0.000) and none in terms of site locations (df = 3, MS = 18.71, F=2.08, P= 0.188). The study results showed that these associated species were mainly benthic and came from the nearby environment. Providing good management for the abandoned shrimp ponds in the area could mean reverting them to their original state to provide a habitat for other organisms.
{"title":"Evaluation of shrimp-associated species in abandoned ponds in Mati City, Philippines","authors":"Jason Pilotos, Yam Nesa Bualan","doi":"10.59120/drj.v15ino.2.193","DOIUrl":"https://doi.org/10.59120/drj.v15ino.2.193","url":null,"abstract":"This study aimed to identify, characterize, and evaluate the biodiversity of shrimp-associated species in abandoned shrimp ponds, specifically assessing the trophic levels of bycatch species in Barangay Dahican, Mati City. Using a scoop net, researchers collected macrobenthic samples from Maitum, Lahusan, and Butuasan, finding 1,528 individuals with varying species compositions namely: Oreochromis niloticus (Nile tilapia), Coenobita cavipes (Land hermit crab), Canarium labiatum (Plicate conch), Rochia nilotica (Commercial top), Clithon oualaniense (Guamanian nerite), Cerithium coralium (Coral cerith), and Callinectes sapidus (Blue crab). Cerithium coralium was the most abundant species with 70% relative abundance, followed by Clithon oualaniense, with 29%. In contrast, the least abundant species were the Oreochromis niloticus and Canarium labiatum, with 1% relative abundance. Moreover, biodiversity indices revealed that Lahusan 1 (H' = 0.731; D=0.46) and Butuasan (H' = 0.714; D = 0.5) had higher biodiversity, whereas Lahusan 2 had the lowest (H' = 0.318; D = 0.15). In contrast, Lahusan 2 appeared to be the least diverse (H' = 0.318; D = 0.15). There were significant differences in terms of species abundance (df = 6, MS = 34.18, F = 6.02, P = 0.000) and none in terms of site locations (df = 3, MS = 18.71, F=2.08, P= 0.188). The study results showed that these associated species were mainly benthic and came from the nearby environment. Providing good management for the abandoned shrimp ponds in the area could mean reverting them to their original state to provide a habitat for other organisms.","PeriodicalId":504041,"journal":{"name":"Davao Research Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141270850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The study sought to analyze the youth`s psychosocial characteristics in Agriculture in Bukidnon, Philippines. Specifically, this study aimed to describe the socio-demographic characteristics of the senior high school students; assess the knowledge of the students in agriculture; determine the student’s attitude towards agriculture and to identify the student’s motivation towards agriculture as a degree program. Data were gathered through guided interview/survey that was personally administered to 383 respondents who were in Grade 12 senior high school students in the DepEd, District of Bukidnon. Focus group discussion and key informant interview were also used in the study. Descriptive statistical tools such as mean, rank, percentage, and frequency counts were employed. Findings of the study reveal that the respondents of the study are mostly female, and have experiences in farming. Their parents have moderate level of education. More than half of the respondents’ families do not own a piece of land used in agriculture. They are willing to engage in agriculture but are not willing to enroll in an agriculture degree. These youth have low level of knowledge and skills in agriculture and have favorable attitude and positive motivation towards a degree.
{"title":"Youth`s psychosocial characteristics in agriculture: The case of Bukidnon, Philippines","authors":"Anecil Quijano-Pagutayao","doi":"10.59120/drj.v15i1.188","DOIUrl":"https://doi.org/10.59120/drj.v15i1.188","url":null,"abstract":"The study sought to analyze the youth`s psychosocial characteristics in Agriculture in Bukidnon, Philippines. Specifically, this study aimed to describe the socio-demographic characteristics of the senior high school students; assess the knowledge of the students in agriculture; determine the student’s attitude towards agriculture and to identify the student’s motivation towards agriculture as a degree program. Data were gathered through guided interview/survey that was personally administered to 383 respondents who were in Grade 12 senior high school students in the DepEd, District of Bukidnon. Focus group discussion and key informant interview were also used in the study. Descriptive statistical tools such as mean, rank, percentage, and frequency counts were employed. Findings of the study reveal that the respondents of the study are mostly female, and have experiences in farming. Their parents have moderate level of education. More than half of the respondents’ families do not own a piece of land used in agriculture. They are willing to engage in agriculture but are not willing to enroll in an agriculture degree. These youth have low level of knowledge and skills in agriculture and have favorable attitude and positive motivation towards a degree.","PeriodicalId":504041,"journal":{"name":"Davao Research Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140992023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-08DOI: 10.59120/drj.v15ino.2.185
Hanelen Pislan, Cirilo Ybañez
Copepods are essential components of marine ecosystems, facilitating energy transfer within these complex systems. The study investigates copepod diversity and distribution in Ban-ao and Lambajon coastal areas in Baganga, Davao Oriental, highlighting the environmental factors influencing copepod populations. Four copepod families representing different orders were identified, with Harpacticoida, Calanoida, and Cyclopoida prevalent in both sites, while Misophrioida was exclusive to Lambajon. Physico-chemical parameters such as dissolved oxygen (DO), pH, salinity, sediment composition, water depth, and temperature were analyzed to understand their correlation with copepod density. The study reveals variations in copepod density and abundance between the sites, with Lambajon showing a higher total density (49 ind/cm³) compared to Ban-ao (35 ind/cm³). The Pearson correlation matrix illustrates complex relationships between copepod density and environmental parameters in each site. In Ban-ao, strong positive correlations were found between copepod density and DO (r = 0.65) and temperature (r = 0.36). In Lambajon, positive correlations existed between water depth and copepod density (r = 0.20). Both sites exhibit low copepod diversity overall, potentially due to anthropogenic pressures. These findings emphasize the need for further research to understand the interactions between environmental factors and copepod diversity, essential for effective conservation and management strategies in these coastal ecosystems.
{"title":"Copepod distribution and diversity in the coastal areas of Ban-ao and Lambajon, Davao Oriental, Philippines: Environmental influences and conservation implications","authors":"Hanelen Pislan, Cirilo Ybañez","doi":"10.59120/drj.v15ino.2.185","DOIUrl":"https://doi.org/10.59120/drj.v15ino.2.185","url":null,"abstract":"Copepods are essential components of marine ecosystems, facilitating energy transfer within these complex systems. The study investigates copepod diversity and distribution in Ban-ao and Lambajon coastal areas in Baganga, Davao Oriental, highlighting the environmental factors influencing copepod populations. Four copepod families representing different orders were identified, with Harpacticoida, Calanoida, and Cyclopoida prevalent in both sites, while Misophrioida was exclusive to Lambajon. Physico-chemical parameters such as dissolved oxygen (DO), pH, salinity, sediment composition, water depth, and temperature were analyzed to understand their correlation with copepod density. The study reveals variations in copepod density and abundance between the sites, with Lambajon showing a higher total density (49 ind/cm³) compared to Ban-ao (35 ind/cm³). The Pearson correlation matrix illustrates complex relationships between copepod density and environmental parameters in each site. In Ban-ao, strong positive correlations were found between copepod density and DO (r = 0.65) and temperature (r = 0.36). In Lambajon, positive correlations existed between water depth and copepod density (r = 0.20). Both sites exhibit low copepod diversity overall, potentially due to anthropogenic pressures. These findings emphasize the need for further research to understand the interactions between environmental factors and copepod diversity, essential for effective conservation and management strategies in these coastal ecosystems. \u0000 ","PeriodicalId":504041,"journal":{"name":"Davao Research Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140997852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-08DOI: 10.59120/drj.v15ino.2.186
John Glen Seniel, Lea Jimenez, Emily Antonio
The decline of mangrove coverage across the Philippines to 50% of its original coverage in present years has, led to significant reductions of ecological functions to fisheries and benefits to man. The mangrove forest in Davao City was assessed for its taxonomic list, Importance Value Index, abundance and distribution of mangrove regenerations, forest structure, and species diversity status. The study was conducted in Barangay Bunawan, Lasang, Panacan, Matina Aplaya, 76-A, and Bago Aplaya. All data were gathered by establishing sampling plots (10m x 10m) using the modified transect-plot method. Overall, a total of 34 mangrove species were listed, of which 21 were identified as true mangroves and 13 as mangrove associates. The 21 mangrove species were very low in species richness (54%). Importance Value Index showed that Avicennia marina, Rhizophora apiculata, and Sonneratia alba, respectively, as dominant mangrove species. The mangrove regenerations were in poor condition (<0.50) while relative abundances of growth stages consisted of mature stands at 46.04%, saplings with 27.78%, and seedlings with 26.18%. General diversity indices obtained a low value on the Shannon-Wiener diversity index (H'=1.42) and an average value on the species evenness index (E=0.61), all indicating stressful and unstable mangrove forests. Thus, the mangrove forest ecosystem has imbalances and eventually, only certain species would survive.
{"title":"Diminishing mangrove forest structures in Davao City, Philippines","authors":"John Glen Seniel, Lea Jimenez, Emily Antonio","doi":"10.59120/drj.v15ino.2.186","DOIUrl":"https://doi.org/10.59120/drj.v15ino.2.186","url":null,"abstract":"The decline of mangrove coverage across the Philippines to 50% of its original coverage in present years has, led to significant reductions of ecological functions to fisheries and benefits to man. The mangrove forest in Davao City was assessed for its taxonomic list, Importance Value Index, abundance and distribution of mangrove regenerations, forest structure, and species diversity status. The study was conducted in Barangay Bunawan, Lasang, Panacan, Matina Aplaya, 76-A, and Bago Aplaya. All data were gathered by establishing sampling plots (10m x 10m) using the modified transect-plot method. Overall, a total of 34 mangrove species were listed, of which 21 were identified as true mangroves and 13 as mangrove associates. The 21 mangrove species were very low in species richness (54%). Importance Value Index showed that Avicennia marina, Rhizophora apiculata, and Sonneratia alba, respectively, as dominant mangrove species. The mangrove regenerations were in poor condition (<0.50) while relative abundances of growth stages consisted of mature stands at 46.04%, saplings with 27.78%, and seedlings with 26.18%. General diversity indices obtained a low value on the Shannon-Wiener diversity index (H'=1.42) and an average value on the species evenness index (E=0.61), all indicating stressful and unstable mangrove forests. Thus, the mangrove forest ecosystem has imbalances and eventually, only certain species would survive.","PeriodicalId":504041,"journal":{"name":"Davao Research Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140999301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Forests are landscapes dominated by trees and cover approximately 30% of the earth’s land surface, housing most of its biodiversity. This study aimed to quantify the tree height and canopy structure of a man-made forest in the locality, particularly the density, relative density, frequency, relative frequency, coverage, relative coverage, diversity, and importance value of the trees in the study area. The establishment of the study area was conducted on September 8, 2017, a period of one day and a transect-quadrat method was employed to assess the trees in the forest. Two (2) species of tree were found in the study area. These were Gmelina (Gmelina arborea) and Mahogany (Swietenia macrophylia). The densest tree species was Mahogany with 0.53 followed by Gmelina with 0.47. Mahogany was also observed to have a higher frequency than Gmelina. Gmelina in the study area has larger canopy coverage and circumference at breast height than Mahogany attributed to its fast-growing nature. The diversity of tree species in the study area was found to be low, attaining only 0.47 on the Shannon-Wiener Diversity Index and 0.69 on Simpson’s Diversity Index due to the small number of tree species present. The results of the importance value were low, with 1.32 for Gmelina and 1.68 for Mahogany since they are relatively young and have similar numbers of individuals.
{"title":"Quantifying tree height and canopy structure in a forest in Davao Oriental State College of Science and Technology, Mati City, Davao Oriental","authors":"Rancil Quin Salang","doi":"10.59120/drj.v12i3.118","DOIUrl":"https://doi.org/10.59120/drj.v12i3.118","url":null,"abstract":"Forests are landscapes dominated by trees and cover approximately 30% of the earth’s land surface, housing most of its biodiversity. This study aimed to quantify the tree height and canopy structure of a man-made forest in the locality, particularly the density, relative density, frequency, relative frequency, coverage, relative coverage, diversity, and importance value of the trees in the study area. The establishment of the study area was conducted on September 8, 2017, a period of one day and a transect-quadrat method was employed to assess the trees in the forest. Two (2) species of tree were found in the study area. These were Gmelina (Gmelina arborea) and Mahogany (Swietenia macrophylia). The densest tree species was Mahogany with 0.53 followed by Gmelina with 0.47. Mahogany was also observed to have a higher frequency than Gmelina. Gmelina in the study area has larger canopy coverage and circumference at breast height than Mahogany attributed to its fast-growing nature. The diversity of tree species in the study area was found to be low, attaining only 0.47 on the Shannon-Wiener Diversity Index and 0.69 on Simpson’s Diversity Index due to the small number of tree species present. The results of the importance value were low, with 1.32 for Gmelina and 1.68 for Mahogany since they are relatively young and have similar numbers of individuals.","PeriodicalId":504041,"journal":{"name":"Davao Research Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139382395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The fallen leaves, small twigs, seeds, and other woody debris that accumulate on the ground are a natural part of the forests and make up the leaf litter. Leaf litter is an important factor in healthy soil. As it decomposes, it replenishes soil with nutrients such as nitrogen, phosphorus, and other inorganic compounds. This study aimed to identify the factors affecting the rate of the leaf litter decomposition process. The study was conducted in the mini forest and observation was conducted from August to October 2017. Data was collected weekly by observing and counting insects, and invertebrates in the leaf litter set-up which was composed of varying decaying leaf colors placed inside a mesh; the setup was separated into three colors: green, orange, and brown color and initially weighed 200 grams for each mesh bag and placed on the forest floor. The weight changes were noted every week during the visit to the field setup. This leaf litter observation concludes that various factors are affecting the process of decomposition of the leaf litter. This includes the presence of invertebrates and decomposers, the age of the leaves used in the setup, temperature, and the disturbances.
{"title":"Factors affecting the decomposition of leaf litters in a mini-forest","authors":"Jireh Rosales, E. Macusi","doi":"10.59120/drj.v12i3.119","DOIUrl":"https://doi.org/10.59120/drj.v12i3.119","url":null,"abstract":"The fallen leaves, small twigs, seeds, and other woody debris that accumulate on the ground are a natural part of the forests and make up the leaf litter. Leaf litter is an important factor in healthy soil. As it decomposes, it replenishes soil with nutrients such as nitrogen, phosphorus, and other inorganic compounds. This study aimed to identify the factors affecting the rate of the leaf litter decomposition process. The study was conducted in the mini forest and observation was conducted from August to October 2017. Data was collected weekly by observing and counting insects, and invertebrates in the leaf litter set-up which was composed of varying decaying leaf colors placed inside a mesh; the setup was separated into three colors: green, orange, and brown color and initially weighed 200 grams for each mesh bag and placed on the forest floor. The weight changes were noted every week during the visit to the field setup. This leaf litter observation concludes that various factors are affecting the process of decomposition of the leaf litter. This includes the presence of invertebrates and decomposers, the age of the leaves used in the setup, temperature, and the disturbances.","PeriodicalId":504041,"journal":{"name":"Davao Research Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139381361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Decomposers are integral parts of our ecosystem, breaking down matter and releasing it back into the soil for other living things to utilize instead of remaining unused in the tissues of dead animals and plants. This research focused on identifying the decomposers found in Chrysophyllum cainito, commonly known as the star apple. Additionally, it aimed to recognize the non-living elements that influence the small ecosystem within a decomposing log. The study was conducted on August 14, 2017, at the Davao Oriental State College of Science and Technology (DOSCTS) main campus, with the observation lasting one day. A total of eight decomposers were discovered, including lichens, mosses, fungi, polychaete worms, earthworms, termites, woodlice, and ants. The study also documented various abiotic factors such as sunlight, soil, oxygen, water, temperature, and the decomposition log itself. These findings indicate that the sampled area displayed a high diversity of decomposers.
{"title":"Decomposers found on a partially decomposed Caimito (Chrysophyllum caimito): Example of a log ecosystem","authors":"Rancil Quin Salang","doi":"10.59120/drj.v12i3.103","DOIUrl":"https://doi.org/10.59120/drj.v12i3.103","url":null,"abstract":"Decomposers are integral parts of our ecosystem, breaking down matter and releasing it back into the soil for other living things to utilize instead of remaining unused in the tissues of dead animals and plants. This research focused on identifying the decomposers found in Chrysophyllum cainito, commonly known as the star apple. Additionally, it aimed to recognize the non-living elements that influence the small ecosystem within a decomposing log. The study was conducted on August 14, 2017, at the Davao Oriental State College of Science and Technology (DOSCTS) main campus, with the observation lasting one day. A total of eight decomposers were discovered, including lichens, mosses, fungi, polychaete worms, earthworms, termites, woodlice, and ants. The study also documented various abiotic factors such as sunlight, soil, oxygen, water, temperature, and the decomposition log itself. These findings indicate that the sampled area displayed a high diversity of decomposers.","PeriodicalId":504041,"journal":{"name":"Davao Research Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139316088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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