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Research Letters in Ecology
Volume 2008, Article ID 185642, 4 pages
Research Letter

Increased Chlorophyll Levels in the Southern Caspian Sea Following an Invasion of Jellyfish

1Dolmabahce Sarayi, 2 Hareket Kosku, 34353 Besiktas, Istanbul, Turkey
2Mazandaran Fisheries Research Center, Caspian Sea Research Institute in Ecology, P.O. Box 961, Sari, Iran
3European Commission-Joint Research Centre, Institute for Environment and Sustainability, TP272, 21027 Ispra, Italy
4European Commission - Joint Research Centre, Institute for the Protection and Security of the Citizen, TP051, 21027 Ispra, Italy

Received 10 December 2007; Accepted 18 February 2008

Academic Editor: Mark Gibbons

Copyright © 2008 Ahmet E. Kideys et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Supplementary Material

Monthly samples of gelatinous zooplankton Mnemiopsis leidyi were collected over a six year period from the southern Caspian Sea, counted and sorted according to different size groups with the naked eye. Individual weights were calculated from length measurements. Non-gelatinous zooplankton samples were often sampled simultaneously along with Mnemiopsis leidyi and analysed with an inverted microscope. Phytoplankton samples from the same sampling stations with M. leidyi were collected and analysed under microscope only between July 2001 and September 2002. Satellite chla data were obtained from the Sea-Viewing Wide-Field-of-View Sensor (SeaWiFS) and the Moderate Resolution Spectroradiometer (MODIS). Night time monthly average data of sea surface temperatures were derived from the Advanced Very High Resolution Radiometers (AVHRR).

The statistical tests between the two nested generalised additive models showed that the shape of the seasonal cycle changed during the period investigated.

  1. Supplementary Text