López-Cabello Zayra, Coria-Monter Erik, Monreal-Gómez María Adela, Salas de León David Alberto, Durán-Campos Elizabeth, Gracia Adolfo
Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad de México, Ciudad de México, Mexico.
Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Ciudad de México, Ciudad de México, Mexico.
PeerJ. 2025 Mar 31;13:e19118. doi: 10.7717/peerj.19118. eCollection 2025.
This study examines the vertical assemblages of the holoplanktonic mollusks (Pteropoda and Pterotracheoidea) in the Campeche Canyon, southern Gulf of Mexico, during a "Nortes" season (February 21-28, 2011) and explores their relationship with the hydrography and the geostrophic circulation pattern. High-resolution hydrographic data were acquired during a multidisciplinary research cruise of 48 hydrographic stations. Zooplankton samples were collected at 24 stations from four depths (10, 50, 100, and 200 m) using a multiple open/closed net system. The results revealed a deep thermocline at a depth of 90 m and a circulation pattern dominated by cyclonic and anticyclonic eddies that induced cold and warm cores. Thirty-three Pteropoda and three Pterotracheoidea species were identified, with the highest richness at a depth of 100 m (just below the thermocline). The highest organism densities were observed at a depth of 10 m. The diversity index (') showed variations depending on the sampling depth, with the highest values (1.9 bits ind) at 100 and 200 m, while at 10 m depth the lowest values (1.45 bits ind) were observed. Multivariate analyses showed that dissolved oxygen, and temperature were the main environmental factors determining organism density.
本研究调查了墨西哥湾南部坎佩切峡谷在“东北风”季节(2011年2月21日至28日)中全浮游软体动物(翼足类和鳍螺总科)的垂直组合,并探讨了它们与水文状况和地转环流模式的关系。在一次包含48个水文站的多学科研究航次中获取了高分辨率水文数据。使用多重开/闭网系统在24个站点的四个深度(10米、50米、100米和200米)采集了浮游动物样本。结果显示在90米深度处有一个深厚的温跃层,以及以气旋式和反气旋式涡旋为主导的环流模式,这些涡旋形成了冷核和暖核。鉴定出了33种翼足类和3种鳍螺总科物种,在100米深度(刚好在温跃层下方)物种丰富度最高。在10米深度观察到最高的生物密度。多样性指数(')随采样深度而变化,在100米和200米处值最高(1.9比特/个体),而在10米深度观察到最低值(1.45比特/个体)。多变量分析表明,溶解氧和温度是决定生物密度的主要环境因素。