Centre for Sustainable Tropical Fisheries and Aquaculture, and College of Science and Engineering, James Cook University, Townsville, QLD, 4811, Australia.
College of Science and Engineering, James Cook University, and ARC Centre of Excellence for Coral Reef Studies, Townsville, QLD 4811, Australia.
Sci Rep. 2017 Aug 29;7(1):9693. doi: 10.1038/s41598-017-10180-w.
No-take marine reserves (NTMRs) are expected to benefit fisheries via the net export of eggs and larvae (recruitment subsidy) from reserves to adjacent fished areas. Quantifying egg production is the first step in evaluating recruitment subsidy potential. We calculated annual egg production per unit area (EPUA) from 2004 to 2013 for the commercially important common coral trout, Plectropomus leopardus, on fished and NTMR reefs throughout the Great Barrier Reef (GBR), Australia. Geographic region, NTMR status, fish size, and population density were all found to affect EPUA. The interactions among these factors were such that, EPUA on NTMR reefs compared to reefs open to fishing was 21% greater in the southern GBR, 152% greater in the central GBR, but 56% less in the northern GBR. The results show that while NTMRs can potentially provide a substantial recruitment subsidy (central GBR reefs), they may provide a far smaller subsidy (southern GBR), or serve as recruitment sinks (northern GBR) for the same species in nearby locations where demographic rates differ. This study highlights the importance of considering spatial variation in EPUA when assessing locations of NTMRs if recruitment subsidy is expected from them.
禁捕海洋保护区（NTMRs）有望通过保护区向邻近捕捞区净输出卵子和幼体（补充繁殖）来使渔业受益。量化产卵量是评估补充繁殖潜力的第一步。我们计算了澳大利亚大堡礁（GBR）整个地区从 2004 年到 2013 年期间商业上重要的普通珊瑚石斑鱼（Plectropomus leopardus）的单位面积产卵量（EPUA）。发现地理区域、NTMR 状态、鱼类大小和种群密度都会影响 EPUA。这些因素之间的相互作用使得与开放捕捞的珊瑚礁相比，NTMR 珊瑚礁上的 EPUA 在大堡礁南部增加了 21%，在大堡礁中部增加了 152%，但在大堡礁北部减少了 56%。结果表明，虽然 NTMR 可能为补充繁殖提供大量的补充繁殖（大堡礁中部的珊瑚礁），但它们可能为附近的种群提供更小的补充繁殖（大堡礁南部），或者成为补充繁殖的汇点（大堡礁北部），因为这些地点的人口增长率不同。本研究强调了在评估 NTMR 位置时，如果预期从 NTMR 获得补充繁殖，那么考虑单位面积产卵量的空间变化的重要性。
