The effect of migratory shorebirds on the benthic species of three southwestern Atlantic Argentinean estuaries

被引:58
作者
Botto, F [1 ]
Iribarne, OO [1 ]
Martínez, MM [1 ]
Delhey, K [1 ]
Carrete, M [1 ]
机构
[1] Univ Nacl Mar del Plata, Dept Biol, FCEYN, RA-7600 Mar Del Plata, Argentina
来源
ESTUARIES | 1998年 / 21卷 / 4B期
关键词
D O I
10.2307/1353274
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
We experimentally evaluate the effect of migratory shorebirds on the benthic fauna of three southwestern Atlantic Argentinean stop-over and wintering sites: Bahia Samborombon (35 degrees 30'-36 degrees 22'S,57 degrees 23'W), Mar Chiquita coastal lagoon (37 degrees 40'S, 57 degrees 26'W), and Bahia Blanca (38 degrees 48'-39 degrees 25'S, 50 degrees-62 degrees 25'W). The experiments consisted of exclusion ceilings and controls (both 1 m(2)), with 10 replicates each and aligned at the same tidal level. During December 1994- May 1995 these experiments were done, twice in Bahia Samborombon, twice at two sites (Sotelo and Celpa) 4 km apart in Mar Chiquita coastal lagoon, and three times in Bahia Blanca. Three polychaete species (Laconcreis actua, Nephtys fluviatilis, and Heteromastus similis) were found in similar densities in both areas of the Mar Chiquita lagoon. L. acuta and N. fluviatilis were affected in Sotelo, but there was no treatment effect in Celpa. In Sotelo the most abundant shorebirds were Hudsonian godwit (Limosa haemastica), American golden plover (Pluvialis dominica), and White-rumped sandpiper (Calidris fuscicollis), and in Celpa the most abundant shorebirds were White-rumped plover (Charadrius falklandicus), and lesser yellowlegs (Tringa flavipes). The largest polychaete densities were in the upper sediment layer (0-6 cm), which was also the most affected layer. Three polychaete species were found in Bahia Samborombon (L. acuta, N. similis, and Neanthes succinea), but only H. similis showed a treatment effect. The most abundant shorebirds in Samborombon were white-rumped sandpiper and two-banded plover. No effect was detected in Bahia Blanca, where the most abundant shorebirds were white-rumped sandpiper and American golden plover. In all cases, the species affected by shorebirds were the most abundant species. From the two sites of Mar Chiquita, there was a treatment effect only in Sotelo, which was also the area with higher shorebirds counts. However, much lower densities observed in Samborombon (similar to the unaffected area of Mar Chiquita) also produced a significant decrease in infaunal abundance. These evidences also suggest that just selection of study sites may produce different views of the interaction between shorebirds and benthic species.
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页码:700 / 709
页数:10
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