|
Investigation on seasonal abundance of Mnemiopsisleidyi, planktonic community and some of environmental parameters in the Southern part of Caspian Sea and finding their relationship using Principal Component Analysis (PCA)
|
Hassan Nasrollahzadeh Saravi   , Asieh Makhlough , Mozhgan Roshantabari , Ali Mokarami |
|
|
|
Abstract: (24168 Views) |
| The study investigated the relationship between some of biological parameters (phytoplankton, zooplankton and Mnemiopsisleidyiabundance) and some environmental parameters (temperature, salinity and water clearness) in the southern Caspian Sea during 2009 to 2010. Sampling was performed in four seasons (spring, summer, autumn and winter) and at eight transects perpendicular to the coast. Phytoplankton and environmental parameters samples were collected using Niskin. Zooplankton and Mnemiopsisleidyi samples provided by net. Total of 384 phytoplankton and water samples and 160 zooplankton andMnemiopsisleidyi samples were collected at the euphotic zone from depths of 5, 10, 20, 50 and 100 m. According to results, minimum and maximum values of phytoplankton biomass were observed in summer and winter, respectively. During spring and winter, the abundance of zooplankton was in highest level and conversely the minimum values observed during summer and autumn with obvious increasing inM. leidyi abundance. Maximum temperature and salinity were observed in summer and autumn, respectively. Result on PCA analysis in summer showed that decreasing of salinity had positive effect on M. leidyiandzooplankton abundance especially coppepoda and cirripedia groups. In this season, phytoplankton biomass was affected by temperature and salinity. However, with considering PCA analysis in autumn, phytoplankton biomass was correlated with PC1 which had a principal rule as compared to zooplankton. In this season, M. leidyiabundance was correlated with temperature and salinity of water. M. leidyiabundance was negatively correlated with water transparency during the two periods of time. It can be due to mucus excretion of M. leidyiwhich may decrease transparency of the water. In this study for the first time the dynamic population of M. leidyi is used as key factor in the Caspian seaecosystem events, however the interaction of different factors such as biotic and environmental parameters may also have effect on changes of dynamic of zooplankton abundance and its groupscomposition. |
|
| Keywords: Environmental parameters, Phytoplankton, Zooplankton, Mnemiopsisleidyi, Caspian Sea, Iran |
|
|
Full-Text [PDF 747 kb]
(2488 Downloads)
|
Type of Study: Research |
Subject:
Special
Received: 2014/01/20 | Accepted: 2014/01/20 | Published: 2014/01/20
|
|
|
|
|
|
|
| Send email to the article author |
|
|
|
| Add your comments about this article |
|
|
|
