Papers by Mark Ronald Manseguiao
BIODIVERSITAS, 2021
Mangrove ecosystems have been recognized for their roles in climate change mitigation through the... more Mangrove ecosystems have been recognized for their roles in climate change mitigation through their carbon sequestration capacity. However, information on the ecology and carbon stock of mangroves is limited. Thus, this study assessed the species composition, stand characteristics, aboveground biomass, and carbon stock of mangroves in Panabo Mangrove Park, Panabo City, Davao del Norte, Philippines. Data for vegetation analysis and biodiversity assessment were collected using transect line plots method. Meanwhile, aboveground biomass estimation was conducted using nondestructive method. Twenty plots with size of 10 m x 10 m each were established to account for the stand characteristics and aboveground biomass of mangroves. Species composition data identified five species from four families. Avicennia marina was the most important species with an importance value of 153.33%. Stand structure analysis revealed a basal area of 14.65 m² ha⁻¹ and a mean density of 11835 stems ha⁻¹. Biodiversity indices indicated very low species diversity (H' = 1.027), low species richness (R = 0.5148) and less even distribution of species (J = 0.6383). Using allometric equation, the aboveground biomass was 77.45 Mg ha⁻¹ with an estimated stored carbon of 37.18 Mg ha⁻¹ and sequestration potential of 136.44 Mg CO₂ha⁻¹. These baseline data demonstrate that the area can store and sequester potential amounts of carbon and carbon dioxide, respectively, despite the low diversity.
BIODIVERSITAS, 2021
Mangrove ecosystems have been recognized for their roles in climate change mitigation through the... more Mangrove ecosystems have been recognized for their roles in climate change mitigation through their carbon sequestration capacity. However, information on the ecology and carbon stock of mangroves is limited. Thus, this study assessed the species composition, stand characteristics, aboveground biomass, and carbon stock of mangroves in Panabo Mangrove Park, Panabo City, Davao del Norte, Philippines. Data for vegetation analysis and biodiversity assessment were collected using transect line plots method. Meanwhile, aboveground biomass estimation was conducted using nondestructive method. Twenty plots with size of 10 m x 10 m each were established to account for the stand characteristics and aboveground biomass of mangroves. Species composition data identified five species from four families. Avicennia marina was the most important species with an importance value of 153.33%. Stand structure analysis revealed a basal area of 14.65 m² ha⁻¹ and a mean density of 11835 stems ha⁻¹. Biodiversity indices indicated very low species diversity (H' = 1.027), low species richness (R = 0.5148) and less even distribution of species (J = 0.6383). Using allometric equation, the aboveground biomass was 77.45 Mg ha⁻¹ with an estimated stored carbon of 37.18 Mg ha⁻¹ and sequestration potential of 136.44 Mg CO₂ha⁻¹. These baseline data demonstrate that the area can store and sequester potential amounts of carbon and carbon dioxide, respectively, despite the low diversity.
International Journal of Bioscience, Biochemistry and Bioinformatics, 2019
Plants have differential expression of genes despite being propagated through cloning as in the c... more Plants have differential expression of genes despite being propagated through cloning as in the case of mango. This study aimed to determine the effect of intraspecific variation in the host mangoes to the wing shape of the mango leafhopper, Idioscopus clypealis. Leafhopper populations were collected from four different orchards from individual trees. Wings were dissected, imaged and analyzed using multivariate analysis of variance, thin plate spline analysis and relative warp analysis. Results showed significant variation across all sampled trees in each geographic location regardless of farm management methods in the wing shape of the leafhopper. This variation is observed between genders and between trees in an orchard. Results also show that there is intraspecific variation in each host tree even in unsprayed populations and organic pesticide use. High adaptability to host defense and pesticides evidenced by wing variation may be key to persistence in this high value crop despite natural and synthetic control measures.
Farm management methods have always used pesticides to mitigate the pests and improve the crop yi... more Farm management methods have always used pesticides to mitigate the pests and improve the crop yields. This study investigated the population structures of Mango leafhopper, Idioscopus clypealis in mango orchards unsprayed or sprayed with pesticides. The analysis of the populations was based on the wing shapes used by insects to fly. Geometric and morphometric techniques were used to analyze the shapes of the forewings of the pest. The results of the thin plate spline image showed asymmetry in the left and right wings in the two sexes of the insect pest. The relative warp analysis showed that wing shapes of insects in the unsprayed orchard had a mean shape close to the consensus wing shape unlike those populations where there was a routine application of pesticides. The differences in wing shapes of the populations collected from unsprayed and sprayed orchards were argued to be due to the effects of pesticides. HOW TO CITE THIS ARTICLE: Mark Ronald S. Manseguiao, Cesar G Demayo, describing shapes of the wings of the mango leafhop-per, Idioscopus Clypealis (lethierry) collected from different orchards, Entomol Appl Sci Lett, 2018, 5 (1): 95-102.
The effects of environmental factors on genetic modules is important in understanding the develop... more The effects of environmental factors on genetic modules is important in understanding the development of organisms. This study was conducted to determine the developmental modules in the forewings of the mango leafhopper (Idioscopus clypealis) and establish if variation exists between populations attacking different hosts and between sexes. A total of 199 landmarks points were used to outline the margins and wing venation of the leafhopper. Models were constructed to hypothesize modularity in the wings. The γ * (Gamma *) test for Goodness of fit (GoF) was used to assess the best fit model. Results showed that the forewings of I. clypealis is partitioned into 5 developmental modules bounded by the major veins in all populations except for the left forewing of the female leafhopper in Paho variety (γ * = −0.25572, P = 1). The results suggest that wing development is conserved but may be affected by host.
This study was conducted to describe compartmentalization in the inner wings of three local popul... more This study was conducted to describe compartmentalization in the inner wings of three local populations of two-colored coconut leaf beetle, Plesispa reichei. Modularity and Integration Analysis (MINT) tested 5 a priori models of variational modularity in multidimensional data. Using γ* (Gamma*) test for goodness of fit (GoF) statistics comparing the observed and expected covariance matrices show that the inner wing is composed of 3 mutually exclusive and integrated developmental modules. One of the three populations however differ not only between the left and right wing but also based on the priority models of compartmentalization. While variations between populations were observed, results still confirm the idea that the modules observed in the wings are morphological units with clear spatial boundaries and are tightly integrated.
A potential outbreak pest in the Philippines, P. reichei is an understudied coconut herbivore tha... more A potential outbreak pest in the Philippines, P. reichei is an understudied coconut herbivore that is morphologically similar to the outbreak pest Brontispa longgissima. This study was conducted to determine variability in eight geographical populations in the pronotum of P. reichei using geometric morphometric tools. Analysis of variance, coordinate mapping, relative warp and Euclidean distance matrix were used to analyze 24 pronotum landmarks. Results of relative warp analysis showed variations among the different populations. Comparisons between the populations showed that the mean shape of most of the populations were close to the consensus shape however some locations show indicating an adaptive capability in new environments particularly along the anterolateral region and basal margin (RW = 39.98%). Euclidean distance matrix analysis coupled showed that 30.4% of the variation occurs in the anterior margin of the pronotum.
International Journal of Bioscience, Biochemistry and Bioinformatics, 2014
Thesis Chapters by Mark Ronald Manseguiao
The reproductive biology, pollen and seed longevity of the endangered Philippine pitcher plant, N... more The reproductive biology, pollen and seed longevity of the endangered Philippine pitcher plant, Nepenthes truncata, was studied through observation and experiments in its natural environment at lat 7045’N, long 125024’E, 1177 m.a.s.l. in Mindanao, Philippines and in the laboratory. A total of 37 plants, 28 males and 9 females, were observed over a 12-month period. Flowering of the male and female plants was synchronous in the months of March, April and May, apparently triggered by a dry period, and in August, apparently triggered by long sunshine duration. Each male or female plant produced one raceme, which have bifurcate pedicels bearing the florets. All of 272 florets in one male inflorescence matured in a progressive upward direction within 12.67 weeks from inflorescence emergence; and more or less simultaneously within 2 weeks from the bud stage of 112 florets in the female inflorescence. On the average, there were 443,333 tetrasporangiate pollens per male floret. Pollen remained viable for 48 hours at 3 0C in Petri plates with moist tissue paper. Pollen germination and vigor increased with floret maturity. Stigma receptivity, which can be judged by the green color, was highest at anthesis dropping to 56% after 48 hours. Bees, ants, spiders, Lepidoptera and Diptera were found in and around the plant which may be agents of pollination. Seeds were borne on capsules with an average of 11,065 seeds per inflorescence. Seed germination rate higher than 70% can be maintained up to 4 months in room and refrigerated conditions as long as they are kept dry in storage.
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Papers by Mark Ronald Manseguiao
Thesis Chapters by Mark Ronald Manseguiao