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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.
Biological Diversity And Seasonal Variation Of Mesozooplankton In The Southeastern Black Sea Coastal Ecosystem, İlknur Yildiz, Ali̇ Muzaffer Feyzi̇oğlu
Biological Diversity And Seasonal Variation Of Mesozooplankton In The Southeastern Black Sea Coastal Ecosystem, İlknur Yildiz, Ali̇ Muzaffer Feyzi̇oğlu
Turkish Journal of Zoology
In this study, the seasonal distribution of mesozooplankton was investigated between 1999 and 2006 at a station located in the southeastern Black Sea region. A total of 40 cruises were done within the southeastern continental shelf throughout this period in order to collect mesozooplankton samples. A total of 10 mesozooplankton species were identified. The average annual highest abundances of species were 67,770 ind./m^2 in 2000 (Penilia avirostris), 50,048 ind./m^2 in 2001 (Sagitta setosa), 42,143 ind./m^2 in 2006 (Oikopleura dioica), 27,987 ind./m^2 in 2005 (Acartia clausi), 25,792 ind./m^2 in 2001 (Oithona similis), 24,806 ind./m^2 in 2005 (Pseudocalanus elongatus), 12,094 ind./m^2 in …
Seasonal Variations In Body Length And Fecundity Of 2 Copepod Species: Thermocyclops Crassus (Fischer, 1853) And Eudiaptomus Drieschi (Poppe & Mrázek, 1895), Ahmet Bozkurt, Mehmet Fati̇h Can
Seasonal Variations In Body Length And Fecundity Of 2 Copepod Species: Thermocyclops Crassus (Fischer, 1853) And Eudiaptomus Drieschi (Poppe & Mrázek, 1895), Ahmet Bozkurt, Mehmet Fati̇h Can
Turkish Journal of Zoology
The effects of temperature, dissolved oxygen, nitrate, phosphate, and chlorophyll-\alpha concentration on the body length and egg production of a cyclopoid copepod, Thermocyclops crassus, and a calanoid, Eudiaptomus drieschi, were evaluated. Sampling was conducted in Yenişehir Lake (Hatay, Turkey) on a monthly basis between May 2003 and April 2004. The results of the present study showed that, among the parameters considered, temperature and chlorophyll-\alpha concentration were the main parameters influencing the body length of T. crassus and E. drieschi in Yenişehir Lake. For E. drieschi, egg production was also affected by chlorophyll-\alpha levels.