Population biology and secondary production of the sandhopper Pseudorchestoidea brasiliensis (Amphipoda: Talitridae) at Prainha Beach, Brazil
Population biology and secondary production of the sandhopper Pseudorchestoidea brasiliensis (Amphipoda: Talitridae) at Prainha Beach, Brazil
复制标题
巴西 Prainha 海滩沙漏 Pseudorchestoidea brasiliensis（片足纲：Talitridae）的种群生物学和二次生产
DOI：
10.3354/meps142111
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发表时间：
1996
影响因子：
2.5
通讯作者：
V. Veloso
中科院分区：
文献类型：
--
作者：
R. Cardoso;V. Veloso
ABSTR,\CT: The population biology of Pseudorchestoidea brasiliensis (Dana, 1853) [Amphipoda: Talitridae) was studied by monthly sampling from June 1993 through May 1995 at Prainha Beach, Brazil. Three transc.cts were established, each 1 ~ 1 t h 5 levels parallel to the waterline. From each level, 4 replicates were taken with a 0.04 m2 sampler. A stratified distribution was observed, with individuals 3 to 8 mm in length concentrated at the lower levels, while 9 to 12 inm individuals were distributed farther from the waterline. Highest population densities were observed in winter [August 1993 and July 1994) and summer (February 1994 and 1995). Ovigerous females and juveniles were observed during the entire sampling period, indicating continuous reproduction of the population. The sex rat10 was 1.45 for females. Mean brood size was 2.8 eggs and mean egg volume was 0.04 mm:' The production of small eggs might be linked to small size at maturation of the females, which could increase the populat~on growth rate. Growth and mortality rates were greater for males than females. Annual production was about 0.30 g AFDW m-2 yr-' and the PIE ratio varied from 2.16 to 2.3, while life span varied between 12 and 21 mo.
