Spatial And Temporal Distribution Patterns Of Larval Sciaenids In The Estuarine System And Adjacent Continental Shelf Off Santos, Southeastern Brazil

Based on data collected during the project "The influence of the Santos-São Vicente estuarine system on the ecosystem of the adjacent continental shelf" (ECOSAN), from Nov/2004 to Mar/2006, the space-temporal distribution pattern of Sciaenidae larvae in relation to biotic and abiotic factors was investigated. Bongo net was used for sampling, aboard the R/V "Prof. W. Besnard" on the shelf, and the boats "Veliger II" and "Albacora" in the estuarine region. Twelve taxa were identified: Bairdiella ronchus, Ctenosciaena gracilicirrhus, Cynoscion spp., Isopisthus parvipinnis, Macrodon atricauda, Micropogonias furnieri, Menticirrhus spp., Nebris microps, Ophioscion punctatissimus, Paralonchurus brasiliensis, Stellifer rastrifer and Stellifer spp. Sciaenidae larvae were widespread on the continental shelf in both campaigns (frequency of occurrence >80%). They were most abundant in Mar/2006 (mean = 6.47 larvae.m-2; sd = 8.36) and least abundant in Sep/2005 (mean = 2.37 larvae.m-2; sd = 3.33). The average abundance in the estuarine region ranged from 0.12 larvae.m-2 (sd = 0.11) in Jun/2005 to 4.28 larvae.m-2 (sd = 1.99) in Nov/2004. Frequency of occurrence minimum occurred in Aug/2005 (50%) and the maximum in Nov/2004 (100%). The presence of Sciaenidae larvae in most locations and periods suggests that the reproductive process of this family in the region is continuous, spawning being more intense in the warmer months.

本数据集基于2004年11月至2006年3月期间实施的"桑托斯-圣维森特河口系统对邻近大陆架生态系统的影响"（ECOSAN）项目采集的数据，针对石首鱼科（Sciaenidae）仔鱼的时空分布模式及其与生物、非生物因子的关联展开了调查研究。采样采用邦戈网（Bongo net），大陆架海域的采样作业由"W. 贝纳尔教授号"研究船（R/V "Prof. W. Besnard"）完成，河口区域则使用"Veliger II"号与"Albacora"号作业船只。本次研究共鉴定出12个分类单元，分别为：斑鳍白姑鱼（Bairdiella ronchus）、细棘栉石首鱼（Ctenosciaena gracilicirrhus）、犬牙石首鱼属（Cynoscion spp.）、小鳍强棘石首鱼（Isopisthus parvipinnis）、黑颌大吻石首鱼（Macrodon atricauda）、白口石首鱼（Micropogonias furnieri）、毛鳍石首鱼属（Menticirrhus spp.）、小体尼布石首鱼（Nebris microps）、斑眼黄鳍石首鱼（Ophioscion punctatissimus）、巴西带石首鱼（Paralonchurus brasiliensis）、犁形星石首鱼（Stellifer rastrifer）以及星石首鱼属（Stellifer spp.）。石首鱼科仔鱼在两次调查航次中均广泛分布于大陆架海域，出现频率均高于80%。其丰度峰值出现在2006年3月（平均值=6.47尾·m⁻²；标准差=8.36），谷值则出现在2005年9月（平均值=2.37尾·m⁻²；标准差=3.33）。河口区域的平均丰度区间为2005年6月的0.12尾·m⁻²（标准差=0.11）至2004年11月的4.28尾·m⁻²（标准差=1.99）。出现频率的最小值为2005年8月的50%，最大值为2004年11月的100%。石首鱼科仔鱼在多数采样点位与调查时期均有检出，这提示该科鱼类在本研究区域的繁殖过程具有连续性，且在水温较高的月份产卵活动更为旺盛。