Penha-Lopes Gil, Bartolini Fabrizio, Limbu Samwel, Cannicci Stefano, Kristensen Erik, Paula José
Centro de Oceanografia, Laboratório Marítimo da Guia, Faculdade de Ciências da Universidade de Lisboa, Avenida N feminine Senhora do Cabo, 939, 2750-374 Cascais, Portugal.
Mar Pollut Bull. 2009 Nov;58(11):1694-703. doi: 10.1016/j.marpolbul.2009.06.015. Epub 2009 Jul 29.
The effect of different organic-rich sewage concentration (0%, 20% and 60% diluted in seawater) and absence or presence of mangrove trees on the survival, bioturbation activities and burrow morphology of fiddler crabs species was assessed. After 6 months, males of both species always showed higher survival ( approximately 80%) when compared to females ( approximately 20%). Crabs inhabiting pristine conditions achieved higher survival (67-87%) than those living in sewage-exposed mesocosms (40-71%). At 60% sewage loading, fiddler crabs processed less sediment (34-46%) during feeding and excavated slightly more sediment (45-80%) than at pristine conditions. While percent volume of the burrow chambers increased (13-66%) at contaminated mesocosms for both vegetation conditions, burrows were shallower (approximately 33%) in bare cells loaded with sewage. The results show that fiddler crabs presented moderate mortality levels in these artificial mangrove wetlands, but mainly in sewage impacted cells. However, they still function as ecosystem engineers through bioturbation activities and burrow construction.
评估了不同富含有机物的污水浓度（在海水中稀释0%、20%和60%）以及有无红树林对招潮蟹物种的存活、生物扰动活动和洞穴形态的影响。6个月后，与雌性招潮蟹（约20%）相比，两种招潮蟹的雄性个体总是表现出更高的存活率（约80%）。栖息在原始环境中的螃蟹比生活在污水暴露的中型生态系统中的螃蟹存活率更高（67 - 87%），而生活在污水暴露的中型生态系统中的螃蟹存活率为40 - 71%。在污水负荷为60%时，招潮蟹在摄食过程中处理的沉积物较少（34 - 46%），且挖掘的沉积物比在原始环境中略多（45 - 80%）。虽然在两种植被条件下，受污染的中型生态系统中洞穴室的体积百分比都有所增加（13 - 66%），但在装有污水的裸露区域，洞穴较浅（约33%）。结果表明，在这些人工红树林湿地中，招潮蟹有一定程度的死亡率，但主要出现在受污水影响的区域。然而，它们仍然通过生物扰动活动和洞穴构建发挥着生态系统工程师的作用。
