Abstract
This study aimed to identify the shrubs and trees in the five island towns of Northern Samar, Philippines; determine their abundance, community structure; and economic uses to the locals. Four barangays in every island town represented the north, south, east, and west sides. Line Intercept Transect (LIT) at intervals of 100m and plot method with an area of 10m x 10m were used in gathering the data. Transect walks, field plots, and transects were also used in gathering data. There were 207 species of shrubs and trees belonging to 152 genera and 64 families. Shrubs constituted 55.33% and trees 44.67% of the total number of species. Mangifera indica (Anacardiaceae) ranked first in relative density (25.50%), relative frequency (25.30%), and importance value (59.15%). Plots in the island of Laoang were observed to have the highest Shannon Diversity Index (3.25%) and Simpson’s Dominance Index (1.86%). The most abundant shrub and tree species in the island towns were Citrus microcarpa (Cucurbitaceae) and Mangifera indica (Anacardiaceae) respectively. The least abundant shrub and tree species were Gardenia jasminoides (Rubiaceae) and Cananga odorata (Annonaceae) respectively. There were more species of shrubs and trees in the island town of Laoang than in the other four island towns.
Highlights
Shrubs are woody perennial plants that possess multiple stems arising from a common point known as the crown
Systematics plays a vital role in conservation biology in determining the limits of species; only if these taxonomic entities are clearly defined can they be evaluated for rarity and the threat of extinction
The other shrub and tree species accounted for 51.58% total relative density
Summary
Shrubs are woody perennial plants that possess multiple stems arising from a common point known as the crown. Trees are woody perennial plants, such as shrubs, by the presence of usually but not always, a single woody stem known as the trunk. Both shrubs and trees inhabit virtually all climates and soil types, with a large variation in form, adaptability and stress tolerance from species to species [1]. The Philippines is one of the megadiversity countries of the world It has a large population, which exerts tremendous pressure to transform these biodiversity resources into material wealth. Systematics plays a vital role in conservation biology in determining the limits of species; only if these taxonomic entities are clearly defined can they be evaluated for rarity and the threat of extinction. Organisms in small restricted areas, such as islands, are more prone to extinction because an environmental change in their locale can eliminate the entire species at once [7]
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