Biophysical Survey Of The Hinatuan Enchanted Riverunderwater Cave System (Herucs) And Its Connecting River, Surigao Del Sur, Southern Philippines

Danilo  T. Dy,; Annie  G. Diola,; Alex  Santos,; Bernil  Gastardo,; Cyril  Taguba,; Dave Anthony  Valles,; Dominic Franco  C. Belleza,; Ethel  C. Wagas,; Terence Paul  U. Dacles,

Biophysical Survey Of The Hinatuan Enchanted Riverunderwater Cave System (Herucs) And Its Connecting River, Surigao Del Sur, Southern Philippines

Abstract:

A rapid survey inside the Hinatuan Enchanted River Underwater Cave System (HERUCS) and its connecting river was done to gather baseline data on the biophysical aspects of the cave and river ecosystem. It involved collection of water samples, sediments and macrofauna. Water samples were analyzed for the following parameters, namely: nitrates, phosphates, turbidity, BOD, pH, alkalinity, conductivity and total coliform. Sediment samples were analyzed for total organic matter and grain size. A listing of macrofauna found within the length of the established sampling station was also collected, photo-documented and identified. Water from inside the cave have a pH range of 7.35 – 7.39, a BOD of 1.67 – 4.00 mg/L, a 16 ppt salinity (at cave entrance), and, nitrate and phosphate values of 0.32 – 0.44 mg/L and 0.10 – 0.52 mg/L, respectively. The mean total coliformcount of the water sample from the upstream sampling site was 1,700 MPN/100 ml. There were 5 organisms belonging to 4 families recorded from inside the cave while 43 organisms belonging to 9 families were collected from its connecting river. Majority of the macrofauna samples collected were marine to brackish-water species and can be considered accidentals. Although there were no stygobites caught, the possibility of finding new species is high considering the depth of the cave and its many unexplored chambers. Further explorations are highly recommended with the use of mixed gas (i.e., Nitrox) for longer bottom time and more thorough sampling.

References:

АРНА. 1989. Standard Methods for the Examination of Water and Wastewater. 17^th edition, American Public Health Association, Washington D.C., 1,268 PP.
ARGENTE, F.A.T., H.P. PALLA, C.I. NARIDO, M.A. CELEDONIO, and D.T. DY. 2013. The distribution and concentration of organic matter in the surface sediments of Calape Bay, Bohol, Central Philippines. Philippine Journal of Science. 142 (2):33-141.
CHEVALDONNÉ, P. and C. LEJEUSENE. 2003. Regional warming-induced species shift in north-west Mediterranean marine caves. Ecology Letters. 6:371-379.
CULVER, D.C., L.L. MASTER, and H.H. HOBBS. 2000. Obligate cave fauna of the 48 contiguous United States. Conservation Biology. 14:386-401.
GUERAO, G., K. ANGER, U.W.E. NETTLEMANN, and C.D. SCHUBART. 2004. Complete larval and early juvenile development of the mangrove crab Pariesesarma fasciatum (Crustacea: Brachyura: Sesarmidae) from Singapore, with arval comparison of Parasesarma and Perisesarma. Journal of Plankton Research. 25(12) 1389-1408.
GUIDO, A., A. MANTASDREA, A. ROSSO, R. SANFILIPPO, F. TOSTI, R. RIDING and F. RUSSO. 2014. Commensal symbiosis between agglutinated polychaetes and sulfate reducing bacteria. Geobiology. 12(3). 265-275.
ILIFFE, T. 2008. Biology of underwater caves. Jill Heinerth and Bill Oigarden (eds.): Cave Diving, Articles & Opinions, Heinerth Productions, High Springs, FL. 63-68.
JANAKA, G.H.A., J. KUMARA, K. HAYANO, and K. OGIWARA. 2012. Image Analysis Techniques on Evaluation of Particle Size Distribution of Gravel. International Journal of Geomate. 3(1): 290-297.
KAMBESIS, P. 2007. The importance of cave exploration to scientific research. Journal of Cave and Karst Studies. 69(1): 46-58.
KNITTWIESS, L., P. CHEVALDONNE, A. ERESKOVSKY, P.J. SCHEMBRI, and J.A. BORG. 2015. Exploring a poorly known habitat in the Maltese Islands: a preliminary survey of some marine caves. Xjenza-in press.
KRANG, A., M.M. KNADEN, K. STECH, and B.S. HANSSON. 2012. Transition from sea to land: olfactory function and constraints in the terrestrial hermit crab, Coenobita cypeatus. Proceedings of the Royal Society B, 367(279): 3510-3519.
LAZARETH, C.E., E. VANDER PUTTEN, L. ANDRE, and F. DEHAIRS. 2003. High-resolution trace element profiles in shells of the bivalve Isognomon ephippium, a record of environmental spatio-temporal variations? Estaurine, Coastal and Shelf Science. 57:1103-1114.
NAKHLE, K.F., D. COSSA, G. KHALAF and B. BALIAEFF. 2006. Brachidontes varibilis and Patella sp. as quantitative biological indicators for cadmium, lead and mercury in the Lebanese coastal waters. Environmental Pollution. 142(1):73-82.
POULSON, T.L. 1976. Management of biological resources in caves. In: Proceedings of the National Cave Managemenl Symposium, Albuquerque. New Mexico. 1975. Albuquerque (NM): Speleobooks. 46-52.
POULSON, T.L. 1991. Assessing groundwater quality in caves using indices of biological integrity. Pages 495-511 In: Proceedings of the third conference on hydrology, ecology, monitoring and management of groundwater in karst terrains. December 1991. Nashville, Tennessee.
RUWA, R., and V. JACCARINI. 1986. Dynamic zonation of Nerita plicata, N. undata and N. textilis (Prosobranchia:Neritacea) population on a rocky shore in Kenya. Marine Biology. 92: 425-430.
SAGEMAN, B. B., P.B. WIGNALL, and E.G. KAUFFMANN. 1999. Biofacies model on oxygen-deificient facies in epicontinental seas: tool for paleoenvironmental analysis. In Cycles and Events Stratigraphy (eds Einsele G, Ricken W, Seilacher A). Springer, Berlin. 542-564.
SMALL, C. and R.J. NICHOLLS. 2003. A global analysis of human settlement in coastal zones. Journal of Coastal Research. 19:584-599.
WELBOURN, W.C. 1999. Invertebrate cave fauna of Kartchner Caverns, Arizona. Journal of Caves and Karst Studies. 61 (2): 93-101.
WYNNE, J.J. and W. PLEYTEZ. 2005. Sensitive ecological areas and species inventory of Actun Chapat Cave, Vaca Plateau, Belize. Journal of Cave and Karst Studies. 3: 148-157.
ZAMPROGNO, G.C., L.L. FERNANDEZ, and F. DA COSTA FERNANDES. 2010. Spatial variability in the population of Isognomon bicolor (C.B. Adams, 1845) (Mollusca, Bivalvia) on rocky shores in Espirito Santo, Brazil. Brazilian Journal of Oceanography. 58(1): 23-29.