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Waterbird Surveys of the Middle Fly River Floodplain, Papua New Guinea

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Waterbird Surveys of the Middle Fly River Floodplain, Papua New Guinea Wildlife Research, 1996,23,557-69 Waterbird Surveys of the Middle Fly River Floodplain, Papua New Guinea S. A. HalseA, G. B. pearsod, R. P. ~aensch~,P. ~ulmoi~, P. GregoryD, W. R. KayAand A. W. StoreyE *~epartmentof Conservation and Land Management, Wildlife Research Centre, PO Box 51, Wanneroo, WA 6065, Australia. BWetlandsInternational, GPO Box 636, Canberra, ACT 2601, Australia. C~epartmentof Environment and Conservation, PO Box 6601, Boroko NCD, Papua New Guinea. D~abubilInternational School, PO Box 408, Tabubil, Western Province, Papua New Guinea. EOk Tedi Mining Ltd, Environment Department, PO Box 1, Tabubil, Western Province, Papua New Guinea. Abstract In total, 58 species of waterbird were recorded on the grassed floodplain of the Middle Fly during surveys in December 1994 and April 1995. The floodplain is an important dry-season habitat both in New Guinea and internationally, with an estimated (k s.e.) 587249 f 62741 waterbirds in December. Numbers decreased 10-fold between December and April to 54914 f 9790: the area was less important during the wet season when it was more deeply inundated. Only magpie geese, comb-crested jacanas and spotted whistling-ducks were recorded breeding on the floodplain. The waterbird community was numerically dominated by fish-eating species, especially in December. Substantial proportions of the populations of many species that occurred on the Middle Fly in December were probably dry-season migrants from Australia, suggesting that migration across Torres Strait is important to the maintenance of waterbird numbers in both New Guinea and Australia. Introduction About 700 species of bird occur on the island of New Guinea (Coates 1985; Beehler et al. 1986). Many of those at lower altitudes, especially in the Trans-Fly ornithological region in the southernmost part of New Guinea, occur also in Australia. New Guinea is separated from Australia by Torres Strait, which is only 150 km wide at its narrowest point, and at least 102 species of bird migrate annually between the two land masses (Draffan et al. 1983). Although the population size, distribution and migratory status of many species still need to be determined (Ashford 1979), large numbers of Australian waterbirds occur in the Trans-Fly region during the dry season (Beehler et al. 1986). The Trans-Fly ornithological region encompasses much of the lowland part of the Fly River. The lowland part of the Fly River has very little gradient; Kiunga, which is 800 km from the sea, is only 20 m above sea level (Smith and Bakowa 1994). This has resulted in an extensive floodplain, especially on the middle reaches of the river, that is referred to hereafter as the grassed floodplain of the Middle Fly (Jaensch 1994). Together with Bensbach River to the south-west of the Fly River (Finch 1980), the grassed floodplain of the Middle Fly has long been recognised as an important habitat for waterbirds (Rand 1942; Simpson 1990, 1994) and among the most significant wetlands in Papua New Guinea (Scott 1989). In 1981, Ok Tedi Mining Ltd began construction of a large gold and copper mine at Mt Fubilan on the upper reaches of the Ok Tedi, a tributary of the Fly River (Fig. 1). Production began in 1984 and, because of construction difficulties, the mine has operated without a tailings S. A. Hake et al. Fig. 1. Areas surveyed for waterbirds on the grassed floodplain of the Middle Fly in 1994-95. The approximate boundary of the area covered by transects, and the major waterbodies, are shown. Adopted River Mileage (ARM) 350, at northern end of survey area, and ARM 150, at southern end, are marked. dam and without waste retention (Smith and Bakowa 1994). Gold is no longer mined and the principal environmental concerns are the elevated sediment and copper levels in discharge water from the mine (Smith and Hortle 1991). Since 1983, Ok Tedi Mining Ltd has conducted extensive biological monitoring, focused on maintaining biomass and diversity of fish species in the Ok Tedi and Fly River (Smith and Hortle 1991). In 1994-95, the company commissioned Waterbird Surveys of the Middle Fly River waterbird surveys of the grassed floodplain of the Middle Fly during the dry and wet seasons as part of its programme to document the biology of the Fly River system and to expand the range of organisms monitored. Methods Study Area The Fly River lies in the Western Province of Papua New Guinea, arising in the Star Mountains at an altitude of 3500-4000 m above sea level and distance from the sea of approximately 1000 km. For a short distance, it forms the border between Papua New Guinea and Irian Jaya (Fig. 1). Of the world's major rivers, the Fly has the highest run-off per unit area and 23rd-highest discharge (6000 cumecs year-') (Welcornme 1985; Smith and Hortle 1991). Annual rainfall in the headwaters of the system is about 10 m; it is 4 m at the river port of Kiunga near the junction of the Ok Tedi and Fly River and 2 m at Obo on the Middle Fly floodplain (Ok Tedi Mining Ltd 1995). Rainfall in the headwaters is usually evenly distributed through the year but about 75% of rain on the grassed floodplain falls between December and May. Water levels on the grassed floodplain were 3.3 m lower during December 1994 than in April 1995, when most of the floodplain was deeply inundated. The grassed floodplain of the Middle Fly begins about 600 km from the river mouth and extends downstream almost 350 km (Fig. 1). The floodplain is up to 30 km wide and there is little longitudinal variation in habitat as the river meanders through the floodplain. Upstream from the Middle Fly, land adjacent to the river has more relief and the river floodplain is reduced to a comparatively narrow terrace. Downstream from the Middle Fly, the river is influenced by tides, and various types of forest (often mangroves) grow to the river's edge. Several tributaries join the Middle Fly, the most significant being the Strickland River. Lake Murray, the largest lake in the region, is on the floodplain of the Strickland River but was not surveyed (Fig. 1). Most of the grassed floodplain is covered by reeds, Phragmites karka, with smaller areas of wild rice, Oryza rufpogon, near the outer edge of the floodplain and pit-pit, Saccharurn robuszum, lining the river channels (Scott 1989). The whole floodplain is inundated during the wet and early dry seasons. Some low- lying areas, usually tributaries that have been blocked off from the main channel by levees, contain a mosaic of open water and mats of floating grasses, Echinochloa praestarzs and Leersia hexandra, all year and are referred to herein as blocked valley lakes. Lotus, Nelumbo nucifera, waterlilies, Nymphaea and Nymphoides spp., mats of spiny mudgrass, Pseudoraphis spinescens, and red water fern, Azolla pinnata, also occur in blocked valley lakes. Oxbows containing deep water occur on the floodplain where the river has changed course; their banks are higher than the surrounding floodplain and support riparian forest dominated by Barringtonia acutangula, Nauclea orientalis and Terminalia sp., interspersed with occasional sections of bare bank. River channels have a bank structure similar to that of oxbows; the chief difference between the two habitats is the strong current in river channels. Swamps of Melaleuca leucadendra occur at the edge of the floodplain and other areas where water is shallow. Swamps of sago palm, Metroxylon sagu, also occur towards the edge of the floodplain. A high species richness and biomass of fish occurs on the grassed floodplain (Smith and Hortle 1991; Smith and Bakowa 1994). By contrast, the invertebrate fauna appears to be depauperate in both biomass and numbers of species (Chambers 1988). Survey Waterbirds were surveyed at the end of the dry season (2-7 December 1994), when they were congregated on residual water in blocked valley lakes and oxbows, and near the end of the wet season (25-30 April 1995), when most of the floodplain was inundated, birds were dispersed and breeding was likely to be maximal (Coates 1985). For the first three days of each survey, two teams of three observers counted from boats or on foot in accessible areas of open water and adjacent vegetation. Ground counts provided comprehensive species lists and information about species that were difficult to distinguish from the air (e.g. crakes, shorebirds, egrets). Aerial counts were made from a helicopter by two observers (front left, S.A.H., and rear right, G.B.P.) during the second three days. The survey area was divided into 786 transects 200 m wide, located perpendicular to the river channel. Every 23rd transect (36 in total at 4.6-km intervals) was surveyed at a height of 25 m in December and 15 m in April and a speed of c. 90 km h-l. Transects were flown at a lower height in April because many birds occurred in denser habitat and flushed less readily. Each observer counted all waterbirds in a 100-m strip either side of the helicopter, using a line on the window to mark off S. A. Hake et al. 100 m. Length of the transects varied from 24 to 46 km. The overall area divided into transects was 5957 km2, calculated from 1 : 100000 topographic maps. This encompassed the Papua New Guinean portion of the Middle Fly River floodplain, except that we stopped short of the border with Irian Jaya between the northern end of Bosset Lagoon and the point where the border is defined by the Fly River (Fig. 1). At its northern end, the river floodplain extends a short distance into Irian Jaya.
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