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Full-Text Articles in Life Sciences
Hydrothermal Vent Effluents Affect Life Stages Of The Copepod Tisbe Sp, Hans-Uwe Dahms, Li-Chun Tseng, Derek Moo-Chul Shim, Jiang-Shiou Hwang
Hydrothermal Vent Effluents Affect Life Stages Of The Copepod Tisbe Sp, Hans-Uwe Dahms, Li-Chun Tseng, Derek Moo-Chul Shim, Jiang-Shiou Hwang
Journal of Marine Science and Technology
We examined the environmental effects of various concentrations of hydrothermal vent (HV) effluents on growth, reproduction, and survivorship of the Tisbe sp. harpacticoid copepod that were retrieved from localities near the vent. Developmental stages (nauplii and copepodids) were exposed to various concentrations of HV effluents in a static renewal culture system. In the survivorship experiments, we tested 3 distinct developmental phases in HV effluent dilutions from 50% to 1%. The HV effluents considerably reduced the survivorship of the naupliar stages at concentrations of >1% (P < 0.05); all nauplii died at concentrations of 25% and 50%. The copepodids were considerably affected at concentrations of >1% in Tisbe sp. (P < 0.05), and no copepodid survived at 50% (P < 0.01). The adult females died at a 50% concentration in Tisbe sp. The developmental duration was not considerably affected in the naupliar or copepodid phases; however, it exhibited a trend of developmental delay. The naupliar development of Tisbe sp. was substantially delayed at a concentration of 10% (P < 0.01), whereas copepodids and adults only exhibited a trend of delayed development with increasing HV concentration. The endpoint mortality exhibited a greater sensitivity to chemical exposure than the endpoint development time. The early developmental stages of Tisbe sp. in both traits were more sensitive to HV effluents than advanced stages. Mortality was a useful toxicological endpoint compared that of developmental duration. We demonstrated that Tisbe sp. may be used in the monitoring of acute and life cycle effects of natural marine pollution caused by HV effluents.
Predation By Apocyclops Royi (Cyclopoid: Copepod) On Ciliates And Rotifers, Raunak Dhanker, Jiang-Shiou Hwang
Predation By Apocyclops Royi (Cyclopoid: Copepod) On Ciliates And Rotifers, Raunak Dhanker, Jiang-Shiou Hwang
Journal of Marine Science and Technology
We studied the prey consumption rates in Apocyclops royi on neonate and adult rotifers, Brachionus rotundiformis and ciliate, Euplotes sp. in the presence and absence of algae, the smaller Isochrysis galbana and the larger Tetraselmis chui. Both males and females of A. royi were able to successfully ingest neonate and adult rotifers and ciliate. The prey consumption rates were significantly lower in males than in females of A. royi. Regardless of sex and reproductive state of the copepod, prey consumption rates were higher on neonates rotifer than on adults. However, the prey consumption rates were significantly lower on ciliate than …
Copepod Community Structure Of The Winter Frontal Zone Induced By The Kuroshio Branch Current And The China Coastal Current In The Taiwan Strait, Yang-Chi Lan, Ming-An Lee, Cheng-Hsin Liao, Kuo-Tien Lee
Copepod Community Structure Of The Winter Frontal Zone Induced By The Kuroshio Branch Current And The China Coastal Current In The Taiwan Strait, Yang-Chi Lan, Ming-An Lee, Cheng-Hsin Liao, Kuo-Tien Lee
Journal of Marine Science and Technology
This study investigates the spatial distribution of copepods and its relationship with water masses across a frontal area induced by the China Coast Current and the Kuroshio Branch Current in the Taiwan Strait. Temperature and salinity was lower of stations showed significant stratification and lower in the China Coastal Current, but absent or higher in the Kuroshio Branch Current. In this study, 73 copepod species belonging to 36 genera, 18 families and 3 orders were identified. Assemblages of the copepods were divided into three groups KBG, MG and CCG, driven from cluster analysis and were associated with different water masses. …