Temporal variation of energy sources in a floodplain lake fish community

Figures & data

Figure 1. Daily water-level changes of Lake Poyang in 2008. The dark triangles indicate the sampling times of this study.

Figure 2. The δ ¹³C and δ ¹⁵N bi-plot of main producers and consumers collected from Lake Poyang in March and July 2008. Values represent means ±1 SE. White triangles, March primary producers; white squares, March fish; black triangles, July primary producers; and black squares, July fish. Energy sources: Carex, Carex spp.; Cd, C. demersum; Pm, P. malaianus; and POM, particulate organic matter. Fish: Cb, C. brachygnathus; Cc, C. carpio; Hl, H. leucisculus; Pn, P. nitidus; Pv, P. vachelli; Sa, S. asotus; Sc, S. chuatsi; and Sd, S. dabryi.

Table 1. One-way ANOVA comparison of seasonal variations in δ ¹³C and δ ¹⁵N values of producers and consumers.

	δ ^13C			δ ^15N
	F	df	p	F	df	p
Producers
Carex spp.	1.490	1, 2	0.347	0.073	1, 2	0.812
Ceratophyllum demersum	5.565	1, 3	0.099	2087.6	1, 3	<0.001
Potamogeton malaianus	129.0	1, 3	0.001	0.117	1, 3	0.755
POM	20.41	1, 24	<0.001	14.75	1, 24	0.001
Fish
Coilia brachygnathus	19.64	1, 22	<0.001	9.86	1, 22	0.005
Cyprinus carpio	0.371	1, 20	0.549	6.024	1, 20	0.023
Hemiculter leucisculus	2.270	1, 18	0.149	2.685	1, 18	0.119
Pelteobagrus nitidus	7.97	1, 24	0.009	75.40	1, 24	<0.001
Pelteobagrus vachelli	5.72	1, 17	0.029	81.80	1, 17	<0.001
Saurogobio dabryi	4.64	1, 15	0.048	92.00	1, 15	<0.001
Siniperca chuatsi	31.99	1, 10	0.000	43.16	1, 10	0.000
Slilurus asotus	25.62	1, 24	0.000	14.97	1, 24	0.001

Figure 3. Means and 1st to 99th percentile ranges (in parentheses) of basal food source contributions to fish collected from Lake Poyang in spring. Histograms show the distribution of feasible contributions from each source to fish in spring. For each species, producers with a necessary contribution (1st percentile >0%) are labeled in bold letters.

Figure 4. Means and 1st to 99th percentile ranges (in parentheses) of basal food source contributions to fish collected from Lake Poyang in summer. Histograms show the distribution of feasible contributions from each source to fish in summer. For each species, producers with a necessary contribution (1st percentile >0%) are labeled in bold letters.