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| “Spatial and temporal variability of mesozooplankton abundance and biomass estimates in the mangrove creek area along the Karachi coast. Pakistan”. |
| “Spatial and temporal variability of mesozooplankton abundance and biomass estimates in the mangrove creek area along the Karachi coast. Pakistan”. |
| Received:May 22, 2013 Revised:July 09, 2014 |
| DOI： |
| Key words:Mesozooplankton, abundance, Biomass estimates, SIMPER,Discriminant analysis (DA) and Karachi coast. |
| 中文关键词: Mesozooplankton, abundance, Biomass estimates, SIMPER,Discriminant analysis (DA) and Karachi coast. |
| 基金项目: |
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| Abstract: |
| ABSTRACT
The spatial and temporal variability of mesozooplankton abundance and biomass estimates (settle and displacement volume wet, dry and ash-free dry weight) along with their relation to environmental parameters were studied during January 1998 to December 1999. The good correspondence was observed between the dry weight and the other biomass estimaters like to (settle volume, displacement volume, wet weight and Ash free dry weight). The highest value of biomass was observed in northeast monsoon and Pre monsoon periods. The abundance of mesozooplankton also exhibited seasonal trends at both stations. At S2 the highest abundance was estimated during Post monsoon and lowest values of abundance were found in Southwest monsoon at both station. Whereas, at S1 a clear trend of high density in Pre-monsoon to low density in Southwest monsoon were observed. Mesozooplankton abundance was also positively correlated with settle, displacement volume, wet and dry weight. The results of the canonical analysis of the output from the discriminate function analysis was tested, Of fifteen variables, only one was significantly different in single character ratios Dry weight biomass/ ash free dry weight biomass (F 3, 23 = 4.78, P<0.005). The mesozooplankton community typically composed of 28 genera at both stations. Among the mesozooplanktonic groups, Copepoda (66.3%), Gastropod larvae (9.94%), Evadne (4.60), zoea (3.60%) and cypris nauplii (2.56) contributed the most to the similarities within station 1while Copepoda (74.68%), cypris nauplii (5.29%), gastropods (4.87%), nauplii (4.81%), Evadne (1.72%) and zoea (1.53%) at Station 2.. SIMPER (similarity percentage) analysis revealed that Copepoda, Gastropod larvae and cypris nauplii contributed the most to the similarities within station 2 along the station 1. |
| 中文摘要: |
| ABSTRACT
The spatial and temporal variability of mesozooplankton abundance and biomass estimates (settle and displacement volume wet, dry and ash-free dry weight) along with their relation to environmental parameters were studied during January 1998 to December 1999. The good correspondence was observed between the dry weight and the other biomass estimaters like to (settle volume, displacement volume, wet weight and Ash free dry weight). The highest value of biomass was observed in northeast monsoon and Pre monsoon periods. The abundance of mesozooplankton also exhibited seasonal trends at both stations. At S2 the highest abundance was estimated during Post monsoon and lowest values of abundance were found in Southwest monsoon at both station. Whereas, at S1 a clear trend of high density in Pre-monsoon to low density in Southwest monsoon were observed. Mesozooplankton abundance was also positively correlated with settle, displacement volume, wet and dry weight. The results of the canonical analysis of the output from the discriminate function analysis was tested, Of fifteen variables, only one was significantly different in single character ratios Dry weight biomass/ ash free dry weight biomass (F 3, 23 = 4.78, P<0.005). The mesozooplankton community typically composed of 28 genera at both stations. Among the mesozooplanktonic groups, Copepoda (66.3%), Gastropod larvae (9.94%), Evadne (4.60), zoea (3.60%) and cypris nauplii (2.56) contributed the most to the similarities within station 1while Copepoda (74.68%), cypris nauplii (5.29%), gastropods (4.87%), nauplii (4.81%), Evadne (1.72%) and zoea (1.53%) at Station 2.. SIMPER (similarity percentage) analysis revealed that Copepoda, Gastropod larvae and cypris nauplii contributed the most to the similarities within station 2 along the station 1. |
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