By Henri J. Dumont, Tamara A. Shiganova, Ulrich Niermann
The Mediterranean, Black, and Caspian Seas, the rivers and canals that attach them, and the big quantity of delivery within the sector, signify a conduit for aquatic invasion, whose results are just now starting to be understood. This publication offers an updated assessment of jelly invasions within the Ponto-Caspian that have affected neighborhood ecosystems because the early Nineteen Eighties, contrasting that with different organic invasions, looking for underlying principles.
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Both Acartia spp. and C. hamatus are known to be typical summer species, reproducing and attaining their annual peak in mid-summer. Nevertheless, their reproduction will, perhaps, be slightly affected by Aurelia predation. The larval stages of bivalves did not show a trend with increasing population densities of A. aurita, although they make up a high portion of A. aurita gut contents (up to 80% of total numbers). It seems that the high production of newly liberated larvae by the benthic adults compensates the losses due to consumption by medusae (Schneider & Behrends, 1994), although it is also possible that the larvae survive gut passage, as observed by Purcell et al.
Lupova, St. Petersburg State University, personal communication). M. , 1988) and only later appeared in the northeast as well. The ﬁrst massive development of B. , 2000, 2001), and southern regions (A. Kideys, Institute of Marine Research, Turkey, personal communication) in August 1999. Here, we analyze the dynamics of B. cf ovata, the annual and seasonal variability of the development of both M. leidyi and B. cf ovata, and their inﬂuence on the pelagic northeastern Black Sea biota. Ctenophores Mnemiopsis leidyi and Beroe cf ovata and their influence 35 2.
G. Reznitchenko & T. A. Lukasheva, 1991. Quantitative patterns of feeding of the Black Sea ctenophore Mnemiopsis leidyi. Oceanology 31: 196-199. Vinogradov, M. , E. A. Shuskina, E. I. Musayeva & P. Y. Sorokin, 1989. A newly acclimated species in the Black Sea: The ctenophore Mnemiopsis leidyi (Ctenophora: Lobata). Oceanology 29: 220-224. Vinogradov, M. , V. V. Sapozhnikov & E. A. Shushkina, 1992. The Black Sea ecosystem. Moscow. Russia. Nauka, 112 p. (in Russian). Vinogradov, M. E & N. Tumantseva, 1993.