During November–March, blooms of Kai algae genera are commonly seen on rocks and cobblestones in the Nan River, providing habitat for hydropsychid larvae. This study attempted to determine a dietary relationship between the caddisflies and Kai algae by comparing gut contents of hydropsychid larvae between areas with and without Kai algae (Kai-blooming and Control sites). Fourteen specimens of Hydropsyche and Potamyia larvae were collected in the Kai-blooming and Control sites, respectively. Food items in the foreguts were classified as Kai algae (KA), other filamentous algae (OFA), diatoms (DT) and other items (OI). Although the main food type of larvae in both sites was Kai algae, the proportion of KA in larval foreguts from Kai-blooming sites was significantly higher than in those from Control sites (p < 0.05). In addition, larvae in the Kai-blooming area had a significantly lower proportion of OI than in the Control area (p < 0.05). Therefore, hydropsychid larvae tended to consume more Kai algae than diatoms and other filamentous algae during blooming periods. They tended to consume more Kai algae than would be expected by chance alone, even in the area with a small amount of Kai algae.
Benke, A.C. & Wallace, J.B. (1980) Trophic basis of production among net-spinning caddisflies in a Southern Appalachian stream. Ecology, 61 (1), 108–118.
Chaiyasuk, S. & Waiyaka, P. (2001) The study of Kai (green algae) in ecosystems. The Thailand Research Fund (TRF), Chiang Mai, 80 pp.
Changthong, N. (2005) Spatial and temporal changes of Trichoptera community diversity and water quality from streams in Phu Hin Rong Kla National Park. Master of Science in Biology Thesis, Chiang Mai University, Chiang Mai, 96 pp.
Dudgeon, D. (1999) Tropical Asian streams: Zoobenthos, ecology and conservation. Hong Kong University Press, 830 pp.
Dudley, T.L., Cooper, S.D. & Hemphill, N. (1986) Effects of macroalgae on a stream invertebrate community. Journal of the North American Benthological Society, 5 (2), 93–106.
Fairchild, M.P. & Holomuzki, J.R. (2002) Spatial variability and assemblage structure of stream hydropsychid caddisflies. Journal of the North American Benthological Society, 21, 576–588.
Higgins, S.N., Malkin, S.Y., Howell, E.T., Guildford, S.J., Campbell, L., Hiriart-Baer, V. & Hecky, R.E. (2008) An ecological review of Cladophora glomerata (Chlorophyta) in the Laurentian Great Lakes. Phycological Society of America, 44, 1–16.
Hoang, D.C. & Bae, Y.J. (2006) Aquatic insect diversity in a tropical Vietnamese stream in comparison with that in a temperate Korean stream. Limnology, 7, 45–55.
Kunpradid, T. (2005) Diversity of macroalgae and benthic diatoms and their relationships with nutrient compounds in the Ping and Nan Rivers. Doctor of Philosophy in Biology Dissertation. Chiang Mai University, Chiang Mai, 250 pp.
Kunpradid, T. & Tagun, R. (2016) The influence of environmental factors on the distribution on macroalgae, Kai, Cladophora spp., Microspora spp. and Rhizoclonium spp. at Nan River, Tha Wang Pha District, Nan Province. Proceedings 4th Rajabhat University National and International Research and Academic Conference (RUNIRAC IV). Buriram Rajabhat University, Buriram, pp. 419–427.
Laudee, P. & Prommi, T. (2011) Biodiversity and distribution of Trichoptera species along the Tapee River, Surat Thani Province, southern Thailand. Zoosymposia, 5, 279–287.
Lee, R.E. (2008) Phycology, 4th Edition, Cambridge University Press, New York, 547 pp.
Malicky, H. (1987) On some Rhyacophila from Doi Suthep Mountain, Northern Thailand. Trichoptera Newsletter, 14, 27–29.
Malicky, H. (1999) The net-spinning larvae of the Giant Microcaddisfly, Ugandatrichia spp. (Trichoptera, Hydroptilidae). In: Malicky, H. & Chantaramongkol, P. (Eds.), Proceedings of the 9th International Symposium on Trichoptera. Faculty of Science, Chiang Mai University, Chiang Mai, pp. 199–204.
Malicky, H. & Chantaramongkol, P. (1993) The altitudinal distribution of Trichoptera species in Mae Klang Catchment on Doi Inthanon, Northern Thailand: Stream zonation and cool and warm-adapted groups. Revue d’Hydrobiologie Tropicale, 26 (4), 279–291.
Malicky, H. & Chantaramongkol, P. (1999) A preliminary survey of the caddisflies (Trichoptera) of Thailand. In: Malicky, H. & Chantaramongkol, P. (Eds.), Proceedings of the 9th International Symposium on Trichoptera. Faculty of Science, Chiang Mai University, Chiang Mai, pp. 205–216.
Moheimani, N.R.,Borowitzka, M.A., Isdepsky, A. & Fon Sing, S. (2013) Standard methods for measuring growth of algae and their composition. In: Borowitzka, M.A. & Moheimani, N.R. (Eds.), Algae for biofuels and energy: Developments in Applied Phycology. Springer Netherlands, Amsterdam, pp. 265–284.
Oláh, J., Barnard, P.C. & Malicky, H. (2006) A revision of lotic genus Potamyia Banks 1900 (Trichoptera: Hydropsychidae) with the description of eight new species. Linzer Biologische Beiträge, 38 (1), 739–777.
Peerapornpisal, Y. (2013) Freshwater Algae in Thailand. Faculty of Science, Chiang Mai University, Chiang Mai, 434 pp.
Peerapornpisal, Y., Pongsirikul, I. & Kanjanapothi, D. (2005) Potential Use of Freshwater Macroalgae as Food and Drugs. Thailand Research Fund (TRF), Chiang Mai, 183 pp.
Prommi, T. & Thamsenanupap, P. (2015) Diversity and structure of Trichoptera communities and water quality variables in streams, northern Thailand. World Academy of Science, Engineering and Technology International Journal of Environmental and Ecological Engineering, 9 (9), 1065–1072.
Pruetiworanan, S. (2008) Diversity of Macroalgae and Benthic Diatoms in Mekong River Passing Thailand and Their Application for Water Quality Monitoring. Master of Science in Biology Thesis. Chiang Mai University. Chiang Mai, 154 pp.
Rawi, C.S.M., Al-Shami, S.A., Madrus, M.R. & Ahmad, A.H. (2013) Biological and ecological diversity of aquatic macroinvertebrates in response to hydrological and physicochemical parameters in tropical forest streams of Gunung Tebu, Malaysia: Implications for ecohydrological assessment. Ecohydrology 2013, 7, 496–507.
Silalom, S. (2008) Development of a Rapid Biological Assessment Protocol for Water Quality in the Upper Sub-Watershed of the Ping River as Applied to Tropical Lotic Ecosystems. Doctor of Philosophy in Biology Dissertation, Chiang Mai University, Chiang Mai, 144 pp.
Takeaw, S. (2014) The Use of Macroinvertebrates as Water Quality Bioindicators in Mae Chaem District, Chiang Mai Province. Master of Science in Biology Thesis, Chiang Mai University, Chiang Mai, 85 pp.
Thawaroroit, K. & Sangpradub, N. (2016) Diversity and distribution of larval caddisflies in the protected areas; Phu Kradueng National Park, Loei Province and Phu Khieo Wildlife Sanctuary, Chaiyaphum Province. Princess of Naradhiwas University Journal, 8 (1), 101–110.
Thongdej, N. (2012) Diversity of Macroinvertebrate Assemblages from Spring Sources and Foothill Stream of Doi Suthep, Chiang Mai. Bachelor of Science in Biology Special Project, Chiang Mai University, Chiang Mai, 65 pp.
Traichaiyaporn, S. (2012) Kai Algae: Natural Heritage and Sustainable Culture. Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, 72 pp.
Van den Hoek, C. (1963) Revision of the European species of Cladophora. The Netherlands Organization for the Advancement of Pure Research, Leiden, 248 pp.
Wallace, J.B., Benke, A.C. & Lingle, A.H. (1987) Trophic pathways of macroinvertebrate primary consumers in subtropical blackwater streams. Archiv für Hydrobiologie Supplement, 74, 423–451.
Wangpimool, W., Pongput, K., Sukvibool, C., Sombatpanit, S. & Gassman, P.W. (2013) The effect of reforestation on stream flow in Upper Nan River Basin using Soil and Water Assessment Tool (SWAT) Model. International Soil and Water Conservation Research, 1 (2), 53–63.
Whitton, B.A. (1970) Review paper biology of Cladophora in freshwaters. Water Research Pergamon Press, 4, 457–476.