Potential use of marinas as nursery grounds by rocky fishes: insights from four Diplodus species in the Mediterranean
Potential use of marinas as nursery grounds by rocky fishes: insights from four Diplodus species in the Mediterranean
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DOI：
10.3354/meps11641
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发表时间：
2016-04-07
影响因子：
2.5
通讯作者：
Lenfant, P.
中科院分区：
文献类型：
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作者：
Bouchoucha, M.;Darnaude, A. M.;Lenfant, P.
沿着海岸线建造的游艇码头已经在以前被用作许多鱼类苗圃的受保护的沿海地区造成了大量的栖息地破坏。然而，尽管这些建筑的负面生态影响已被广泛报道，但它们在海岸带功能中的潜在作用在很大程度上仍然未知。在此，我们调查了法国地中海沿岸5个码头的4种梁龙幼鱼，以评估石鱼是否能成功地在这些人工海岸区域内定居。研究了连续2年4 ~ 8月对不同船坞人工生境利用的种间差异。我们亦测试了在码头和浮桥上增设人工生境（生物屋）的潜在效益，以增加其作为养鱼场的价值。我们的研究结果表明，尽管不同物种对码头和人工栖息地的偏好存在差异，但梁龙幼鱼会反复占领码头。它们在添加的生物小屋栖息地上的平均丰度是附近裸露表面的两倍。这表明，增加码头垂直结构的复杂性可以大大提高其对幼岩鱼的适宜性，特别是在死亡率最高的最年轻阶段。因此，只要码头水质得到很好的控制，这些人工栖息地内的生态工程可以通过为石鱼提供合适的人工苗圃来减少城市发展的生态后果。
The construction of marinas along the shoreline has caused substantial habitat destruction within the sheltered coastal areas previously used as nursery grounds by many fish species. However, although the negative ecological impacts of these constructions have been reported extensively, their potential roles in the functioning of the coastal zone remain largely unknown. Here, we surveyed the juveniles of 4 Diplodus species in 5 marinas located along the French Mediterranean coast to assess whether rocky fishes can successfully settle inside these artificialized coastal areas. Inter-specific differences in the spatiotemporal use of the various artificial habitats provided by marinas were investigated between April and August over 2 consecutive years. We also tested the potential benefit of pegging additional artificial habitats (Biohuts) on docks and pontoons to increase their value as fish nursery grounds. Our results suggest that although variations in marina and artificial habitat preferences exist between species, Diplodus juveniles repeatedly colonize marinas. Their average abundances on added Biohut habitats were twice as high as on nearby bare surfaces. This suggests that increasing the complexity of the vertical structures of marinas can considerably enhance their suitability for juvenile rocky fishes, especially at the youngest stages, when mortality is highest. Therefore, as long as marina water quality is well controlled, ecological engineering within these man-made habitats might reduce the ecological consequences of urban development by providing suitable alternative artificial nursery grounds for rocky fishes.