Trophic and environmental drivers of the Sechura Bay Ecosystem (Peru) over an ENSO cycle

Taylor, Marc H.; Wolff, Matthias; Vadas, Flora; Yamashiro, Carmen

doi:10.1007/s10152-007-0093-4

Helgoland Marine Research

Table 3 Input–output parameters for the steady-state model of Sechura Bay in 1996 after application of the Ecoranger resampling routine

From: Trophic and environmental drivers of the Sechura Bay Ecosystem (Peru) over an ENSO cycle

Functional group/parameter	Trophic level	B _i (t km⁻²)	P _i/B _i (year⁻¹)	Q _i/B _i (year⁻¹)	EE_i	GE_i	UA_i/Q _i	P/R	R/A	Catch (year⁻¹)	F _i	M0_i	M2_i
1. Phytoplankton	1.00	21.335	343.886	–	0.685	–	–	–	–	–	–	108.454	235.432
2. Macroalgae	1.00	284.607	16.092	–	0.042	–	–	–	–	–	–	15.412	0.680
3. Zooplankton	2.18	27.874	40.059	157.883	0.780	0.254	0.20	0.464	0.683	–	–	8.813	31.246
4. Polychates	2.06	45.897	1.091	4.474	0.825	0.244	0.20	0.438	0.695	–	–	0.191	0.900
5. Scallops	2.00	23.689	1.364	10.556	0.884	0.129	0.20	0.193	0.838	2.340	0.099	0.158	1.108
6. Sea urchins	2.11	22.798	0.597	2.786	0.666	0.214	0.20	0.366	0.732	–	–	0.199	0.398
7. Herbivorous gastropods	2.00	25.258	1.235	4.116	0.665	0.300	0.20	0.600	0.625	–	–	0.414	0.821
8. Benthic detritivores	2.00	36.795	1.302	6.806	0.910	0.191	0.20	0.314	0.761	0.144	0.004	0.117	1.181
9. Misc. filter feeders	2.24	22.064	1.094	5.044	0.736	0.217	0.20	0.372	0.729	0.001	–	0.289	0.805
10. Predatory gastropods	3.07	37.297	1.511	3.881	0.747	0.389	0.20	0.948	0.513	0.379	0.010	0.383	1.118
11. Small carnivores	2.87	14.669	0.537	2.677	0.673	0.201	0.20	0.335	0.749	0.001	–	0.176	0.361
12. Predatory crabs	3.20	7.379	2.002	8.703	0.684	0.230	0.20	0.404	0.712	–	–	0.633	1.369
13. Sea stars	3.15	1.033	0.731	3.670	0.741	0.199	0.20	0.332	0.751	–	–	0.189	0.542
14. Octopods	3.74	0.015	4.911	12.799	0.899	0.384	0.20	0.922	0.520	0.033	2.247	0.496	2.168
15. Littoral fish	2.81	2.613	1.195	14.300	0.694	0.084	0.20	0.117	0.896	1.795	0.687	0.366	0.142
16. Small pelagic fish	2.12	82.134	1.727	18.706	0.639	0.092	0.35	0.166	0.858	81.409	0.991	0.623	0.113
17. Pelagic predatory fish	3.15	1.161	0.869	8.123	0.464	0.107	0.30	0.181	0.847	0.425	0.367	0.466	0.037
18. Marine mammals	3.34	0.019	0.103	46.179	0.000	0.002	0.20	0.003	0.997	–	–	0.103	0.000
19. Sea birds	3.19	0.020	0.037	60.156	0.000	0.001	0.26	0.001	0.999	–	–	0.037	0.000
20. Cephalopods	3.14	0.371	4.249	11.125	0.522	0.382	0.20	0.477	1.001	0.822	2.218	2.031	0.000
21. Detritus	1.00	–	–	–	0.105	–	–	–	–	–	–	0.000	0.000

B biomass, P _i/B _i production rate, Q _i/B _i consumption rate, EE _i ecotrophic efficiency, GE _i conversion efficiency, UA _i/Q _i unassimilated portion of consumption, P/R production/respiration ratio, R/A respiration/assimilation ratio, F _i fishing mortality, M0 _i non-predatory natural mortality, M2 _i predation mortality

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