Time filter

Source Type

Davao, Philippines

Mapi-Ot E.F.,Mindanao State University - Iligan Institute of Technology | Taotao A.U.,Mindanao State University - Iligan Institute of Technology | Nuneza O.M.,Mindanao State University - Iligan Institute of Technology | Villanueva R.J.T.,D3C Gahol Apartment
AACL Bioflux | Year: 2013

Odonata is considered an environmental indicator group of freshwater habitats. Thus there is a need to have a good baseline data to use it for monitoring fluvial habitats. However, species composition of Odonata in Misamis Occidental is poorly known. This study was conducted to determine the species diversity of Odonata in the municipality of Sinacaban and in the cities of Oroquieta and Ozamiz, Misamis Occidental, Philippines. Opportunistic sampling method using sweep nets was employed. There were 266 Odonata individuals collected comprising 22 species. Seven species (31.82%) are Philippine endemic. Low species diversity was recorded in all the sampling sites with more or less even distribution of species. Results indicate that the sampled areas are already disturbed.

The Philippine genus Sangabasis Villanueva is reviewed. Eight new species are described: S. bukid sp. nov., S. bulba sp. nov., S. cahilogi sp. nov., S. carmelae sp. nov., S. feliculoi sp. nov., S. hamis sp. nov., S. janvantoli sp. nov., and S. zam-boanga sp. nov. Copyright © 2014 Magnolia Press.

Mining modifies the surrounding environment and causes habitat deterioration along river systems receiving mine tailings. Here it is assessed whether chromium ore mining affects the odon. abundance and diversity. Line transect surveys were conducted during 4 months at the Henry river (along a pristine section and a previously mined section), and at the Lecing river, which is currently receiving tailings from chromium ore mines. The density of adult odon. was 10 times higher in the pristine than in the mined river. Species richness was reduced in both the currently and in the previously mined sections (5 spp.) as compared to that of the pristine river (12 spp.), showing a detrimental effect of chromium mining on dragonfly diversity and abundance.

Cayasan R.D.,Mindanao State University - Iligan Institute of Technology | Limitares D.E.,Mindanao State University - Iligan Institute of Technology | Gomid J.V.S.,Mindanao State University - Iligan Institute of Technology | Nuneza O.M.,Mindanao State University - Iligan Institute of Technology | Villanueva R.J.T.,D3C Gahol Apartment
AACL Bioflux | Year: 2013

The Odonata is important in identifying the habitat health of freshwater ecosystems. In this study, the species richness and relative abundance of Odonata were determined in 12 sampling sites in Zamboanga del Sur. Field work was conducted in August-December, 2012 using the random sampling method. Thirty-six species belonging to 10 families were documented of which 16 (44%) species are Philippine endemic. High species richness was recorded in Cabilinan Stream which is considered to be the most undisturbed site in the 12 sampling sites. Species richness was also considerably high in eight sampling sites despite habitat modification and water pollution from agricultural run-offs. The presence of Oriental species which are indicators of degraded environments suggests that the streams are disturbed. However, the presence of some endemic species indicates that these endemic fauna can thrive in disturbed habitats.

Villanueva R.J.T.,D3C Gahol Apartment | Schorr M.,OSTLAP
Zootaxa | Year: 2011

Drepanosticta wildermuthi spec. nov. and Sulcosticta vantoli spec. nov. are described and illustrated. The two species are compared with their nearest relatives, D. moorei van Tol & Müller and S. viticula van Tol, respectively. Drepanosticta wildermuthi spec. nov has shorter anterior lobe processes compared to D. moorei. Sulcosticta vantoli spec. nov. has a simpler paraproct structure compared to S. viticula. Copyright © 2011 - Magnolia Press.

Discover hidden collaborations