Diel vertical migration of medusae in the open Southern Adriatic Sea over a short time period (July 2003)

Abstract

ProblemDiel vertical migration (DVM) occurs in a wide range of zooplankton taxa and probably represents the biggest animal migration, in term of biomass, on the planet (Hays 2003). Of the many factors proposed to explain this behavior, the principal attention has been given to light intensity and several hydrographic variables, especially temperature, and how DVM may benefit feeding, predator avoidance, and reproduction (e.g. Longhurst 1985;

Controls of Wind-Driven Jet on the Distribution of Pelagic Cnidarians in the Midwestern South China Sea

“…In terms of species number, the medusae in the WJR were higher than that in the NWJR due to the influence of the coastal water intrusion. Similar conditions were also recorded in other marine ecosystems (Lučić et al, 2009). Additionally, the species numbers of different taxa were affected differently by the wind-driven jet.…”

“…They were mainly distributed above the thermocline, and showed no remarkable diel vertical migration both in the WJR and NWJR. The vertical distribution of medusae influenced by the thermocline is a universal phenomenon and well recorded in different marine ecosystems (Pagès and Gili, 1991;Lučić et al, 2009;Júnior et al, 2015). Additionally, the medusae abundance in the WJR and the NWJR have significant differences above the thermocline, whereas their abundance below the thermocline was similar, indicating that the coastal water with low-salinity and nutrient-rich mainly affected the abundance of medusae above the thermocline in WJR.…”

First record of the hydrozoan Oceania armata Kölliker, 1853 from Turkey

“…In the Mediterranean, it was reported e.g. by Bender and Benović (1986) from the Adriatic Sea, where also Lučić, Benović, Morović, Batistić, and Onofri (2009) found it at depths between 15 and 600 metres. Mizzi (2015) recorded it in Malta.…”

Mesozooplankton spatial distribution and community structure in the South Adriatic Sea during two winters (2015, 2016)

“…Here, attention is focused on a comprehensive study of zooplankton of the deep oligotrophic Adriatic over the wintertime, characterized by weak stratification, and overall lower primary and secondary production (Cerino et al., ; Kršinić, ; Lučić, Benović, Morović, Batistić, & Onofri, ; Najdek et al., ). Winter periods in the South Adriatic Pit are usually characterized by processes of deep water convection and mixing, with pronounced inter‐annual and decadal variability related to the Adriatic‐Ionian Bimodal Oscillating System (BiOS) and Levantine Intermediate Water (LIW) intrusions (Batistić et al., ; Gačić, Eusebi Borzelli, Civitirarese, Cardin, & Yari, ; Gačić et al., ; Vilibić, Matijević, Šepić, & Kušpilić, ).…”

“…Here, attention is focused on a comprehensive study of zooplankton of the deep oligotrophic Adriatic over the wintertime, characterized by weak stratification, and overall lower primary and secondary production (Cerino et al, 2012;Kršinić, 1998;Lučić, Benović, Morović, Batistić, & Onofri, 2009;Najdek et al, 2014).…”