in tropical factors in and summer values represent represent left to l - PDF document

in tropical factors in and summer values represent represent left to low, mid intertidal sites. included in Median grain Organic car- Sediment type ms, fs, ms, ms, m, vcs m (vfs), ms, ms (vfs), ms, ms, m, vfs, vfs, very fine intertidal zones. sediments in zones were organic matter, organic than the other 2 zones rains occurred north river dis- associated organic matter each estuary. plastic cores cm2 surface area) were taken was preserved (0.5 g indicated that the nematodes were intertidal zone. In were passed 2 sieves, with a mesh opening Nematodes retained feeding type Wieser (1953). analysis. Differences tested using nested 3-way (Mixed Model) the analyses, within intertidal zones in estuary with estuaries main treatments. was used differences within sons test determine which values others (2-tailed Sampling procedure high intertidal mangrove vegetational patterns were sampled 2 km inside) additional station bed near Samples were taken at tide before noon (0900 to 1200 intertidal sites were sampled in spring (Oct were sampled winter dry where the and the mid intertidal Island, densities (Table abundances were not significantly densities occurred in low intertidal, systems. Values depict summer faunas Inter-estuary variation and intertidal Hinchinbrook Island species identified) revealed that high intertidal zones but that collections often classified with 3 intertidal zones (Fig. bottom). Although a few other zones along dotted lines, among the intertidal zones. 2.59 .88 .84 2.4 02 .84 2.9 estuaries, nor patterns evident Diversity cor- only with richness correlated with lowest in greatest number species (53) Hinchinbrook Island Normal classification mangrove sites Hinchinbrook Island, using Detrended correspondence Hinchinbrook Island. autumn; Sp: estuaries (35 the Cape performed combin- ing summer 103-114, 1987 and Hinchinbrook Island Claude L Hinchinbrook Is. Normal classification estuaries along the peninsula using identified (winter among the often classified (Fig. 4 is more clearly demonstrated in model constructed explain a variance (eigenvalues high sets northern estuaries along the separating the estuaries along clear, but each estuary more clearly (see data species groups (Table 4) using nodal analysis. The patterns groups (Fig. suggest that separation among intertidal zones a result species assemblages that faithful (fidelity) to a particular Species Group primarily on brook Island in the Species Group ing the 8 displayed a strong preference Groups 4 gicaudata, Trissonchulus among the estuary, but were classified in intertidal zones ordination models nodal analysis indicated that intertidal zones among mangrove estuaries tropics. Previous have suggested that chemical fac- as temperature, sediment soluble tannins roles in determining the Ecol. Prog. Axonolaimus sp. Linhomoeus sp. Comesoma sp. Daptonema sp. Linhomoeus sp. Leptosomatides sp. Oncholaimus sp. Linhomoeus sp. Comesoma sp. Megadesmolaimus sp. Eumorpholaimus sp. macramphis, Catanema sp. nematodes in assume that these disturbance, predation, same estuaries. physical factors community composition lower salinities in systems would Species Groups in the explain inter-estuary colonizing a particular factors peculiar concert with within-estuary dispersal probably also crucial roles in community composition. Intertidal zonation intertidal zonation few studies that have tigated intertidal attributed species patterns physicochemical factors as sediment grain size, found that soluble tannins physical factors temperature) rather variations in correlated significantly with meiofaunal densities. differences in similarly influ- differences in ability. Dispersal ability varies widely forest in (1986) recently concluded that lateral (both tidal lags behind residence time forests can these estuaries physical stress than temperate intertidal communities. species diver- has been particularly in 1962, Boucher 1973, rapid rates high disturbance rates to low tropics (Alongi 1986). 1972, Platt 1977, al. 1985) mangrove habitats (Hopper et found that low intertidal. study, however, were no diversity, richness intertidal zones among es- predatory species do tropics (Krishnamurthy a coral was attnbuted usually ascribed 1975, Krishnamurthy al. 1984) unusual dominance Sphaerolaimus, Enoplus decaying wood, leaves. Whereas nematodes on litter, wood constitute a sediment dwelling et al. not idenhfy a specific litter very few mangrove leaves obs.) were predatory species suggesting that they may soluble tannins leached this litter the aquatic special reference the fauna mangrove swamps Information theory Australia. Australian Canberra, p. (1985). Bacterialproductivity consumers on a coral reef. Int. Coral sandflat. Int. Revue drobiol. 57: (1986). Hydrodynamics structure: interac- exp. mar. Pielou. E. in Strangford Lough, Northern Ireland. Estuar coast. (1953). Die Beziehung zwischen stalt, Ernahrungsweise mangrove swamps. Estuar. coast. Shelf Sci. This article the editor; was accepted July 15,