Instituto Coral Vivo, R. dos Coqueiros 87, Parque Yaya, Santa Cruz Cabrália, BA, Brazil; Departamento de Invertebrados, Museu Nacional, Universidade Federal do Rio de Janeiro, Quinta da Boa Vista, São Cristóvão, Rio de Janeiro, RJ, Brazil.
Instituto de Ciências Biológicas, Universidade Federal do Rio Grande, Av. Itália Km 8, Rio Grande, RS, Brazil.
Mar Environ Res. 2020 Oct;161:105118. doi: 10.1016/j.marenvres.2020.105118. Epub 2020 Aug 17.
Rivers release freshwater, nutrients and pollutants into reefs. This type of environmental stress reduces coral larvae settlement and alter its energy metabolism. We investigated the tolerance of Favia gravida (Scleractinia) larvae to river discharges. We exposed larvae to (i) different salinities (25, 30, 35 and 40 PSU); and (ii) dilutions of river water containing nutrients and metals (0, 20, 40, 60, 80 and 100% river water) under control salinity of 35 PSU. We then examined settlement and larval enzymatic activity. No differences in settlement were detected among salinities. Settlement was also similar to control for larvae under 100% river water. Enzymatic activity for citrate synthase remained unaltered for all treatments. Lactate dehydrogenase activity was slightly altered under different salinities, suggesting a mild stress response. Findings suggest that F. gravida larvae are tolerant to a wide range of salinity and nutrient conditions and that this is a stress-tolerant species.
河流将淡水、营养物质和污染物释放到珊瑚礁中。这种环境压力会降低珊瑚幼虫的定殖，并改变其能量代谢。我们研究了 Favia gravida（石珊瑚）幼虫对河流排放的耐受能力。我们将幼虫暴露于（i）不同盐度（25、30、35 和 40 PSU）；和（ii）含有养分和金属的河水稀释液（0、20、40、60、80 和 100%河水），在 35 PSU 的控制盐度下。然后，我们检查了定殖和幼虫的酶活性。盐度之间的定殖率没有差异。对于 100%河水处理下的幼虫，定殖率也与对照相似。柠檬酸合酶的酶活性在所有处理中均保持不变。在不同盐度下，乳酸脱氢酶活性略有改变，表明存在轻度应激反应。研究结果表明，F. gravida 幼虫对广泛的盐度和营养条件具有耐受性，并且是一种耐受应激的物种。
