Population Abundances, Tidal Movement, Burrowing Ability and Oxygen Uptake of Emerita analoga (Stimpson) (Crustacea, Anomura) on a Sandy Beach of South-Central Chile

Mariano Lastra; Eduardo Jaramillo; Jesus Lopez; Heraldo Contreras; Cristian Duarte; J. German Rodriguez

摘要

Field sampling and other experiments were carried out during February 2001 to determine whether different morphodynamic characteristics occurring within an intermediate sandy beach of southern Chile (ca. 39°S) convey differences in population abundance, tidal movement, burrowing ability and oxygen uptake of the anomuran crab Emerita analoga (Stimpson, 1857). Crabs were collected along transects extended between the lowest swash levels and the retention zone above the effluent line of the south and north end of the beach. Burrowing times of nearly 70 crabs collected at each study site were measured in saturated sands collected from the lowest swash level of each site. Oxygen uptake of crabs was measured in incubation glass bottles. The intertidal zone of the north end of the beach was wider (56 m) and flatter (1/14) than that of the south end (45 m and 1/9, respectively). In general, the swash zone of the north end was significantly wider than the south end throughout the sampling period. The frequency of swashes and number of swash crossings above the effluent line, plus up-wash speed, were usually higher at the steeper south end of the beach. The mean population abundance of E. analoga per linear metre of beach was significantly higher at the north end, whereas density per square metre was significantly higher at the south end. No differences were found in biomass figures. Although the highest abundance of crabs at the north end was usually observed at the lowest swash levels, similar population abundances occurred along all the tidal levels sampled at the south end. Burrowing times of crabs collected from both ends of the beach increased significantly with increasing carapace length and body mass. The mean burrowing time of crabs collected at the south end of the beach was shorter than that of those collected at the north end. Oxygen uptake of E. analoga was positively and exponentially correlated with the size of individuals collected from both ends of the beach. Results of ANCOVA showed no significant difference between the regression lines obtained for the oxygen uptake of crabs collected at both ends of the beach. It is concluded that physical features of each end of the beach seem not to differ enough to produce differences in oxygen uptake of E. analoga, or in the biomass, population structure and body size of crabs, within a single beach of south-central Chile.

机译：2001年2月进行了田间采样和其他实验，以确定智利南部一个中间沙滩（约39°S）内发生的不同形态动力学特征是否传达了无尾目种群的丰度，潮汐运动，挖穴能力和吸氧量的差异。 Emerita Analoga蟹（Stimpson，1857）。沿在最低斜流水位和海滩南北端出水线以上的保留区之间延伸的样板收集螃蟹。在每个研究地点收集到的近70只螃蟹的挖穴时间是在从每个研究地点的最低斜盘水位收集的饱和沙子中测量的。在保温玻璃瓶中测量螃蟹的摄氧量。海滩北端的潮间带比南端的潮间带（56 m）更平坦（1/14）（分别为45 m和1/9）。通常，在整个采样期间，北端的斜带明显宽于南端。在较陡的海滩南端，污水流上方的冲水频率和冲水交叉口数量加上上冲速度通常较高。每线性米滩的平均大肠杆菌丰度在北端显着较高，而每平方米密度在南端显着较高。在生物量图中未发现差异。尽管通常在最低的斜率水平下在北端观察到最高的螃蟹数量，但是在南端采样的所有潮汐水平上也出现了相似的种群数量。随着甲壳长度和体重的增加，从海滩两端收集的螃蟹的穴居时间显着增加。在海滩南端收集的螃蟹的平均挖洞时间比在北端收集的螃蟹的平均挖洞时间短。类似物大肠埃希氏菌的摄氧量与从海滩两端收集的个体大小呈正相关和指数相关。 ANCOVA的结果表明，在海滩两端收集的蟹的摄氧量回归线之间没有显着差异。结论是，在智利中南部的一个海滩内，海滩每一端的物理特征似乎差异不大，不足以导致大肠埃希氏菌的摄氧量或蟹的生物量，种群结构和体重的差异。。

Population Abundances, Tidal Movement, Burrowing Ability and Oxygen Uptake of Emerita analoga (Stimpson) (Crustacea, Anomura) on a Sandy Beach of South-Central Chile

摘要

著录项

相似文献

相关主题

期刊订阅