Genetic diversity of two Philippine native freshwater goby species (Perciformes: Gobiidae): implications for conservation

Abstract

Appropriate decision-making in conservation programmes requires an understanding of the population genetic structure of various indigenous species. However, in lake and river ecosystems rated as biodiversity conservation priority areas in the Philippines, the diversity of many species remains uncharacterized.To address the existing gap, genetic diversity of two native freshwater fishes, Glossogobius celebius (Valenciennes, 1837) and Glossogobius giuris (Hamilton, 1822) was measured. Genetic structure and estimates of genetic variation for each species was determined using isozyme analysis.A higher level of genetic variation was observed within G. celebius populations compared with G. giuris. Genetic structure indicated that the observed genetic variation in G. giuris is due to the variation among the populations. The results suggest the presence of geographical barriers even in adjacent aquatic ecosystems that could restrict gene flow among G. giuris populations.This study supports the need for immediate conservation interventions for both species as they show a low level of genetic diversity in addition to being threatened in their own environment. Possible measures include translocation and establishment of a refuge population of the species studied to be complemented with location-specific strategies that would enhance their habitat conditions. In addition, education and enhancing the awareness of the local community regarding habitat protection are strongly recommended.