Life cycle and population dynamics ofIdotea balthica basteri(Pallas, 1772), Isopoda Valvifera from the Bizerte lagoon (Southern Mediterranean Sea - Tunisia)

2013 ◽  
Vol 35 (3) ◽  
pp. 367-376 ◽  
Author(s):  
Wahiba Zaabar ◽  
Mohamed S. Achouri ◽  
Faouzia Charfi-Cheikhrouha
Keyword(s):  
Population Dynamics ◽  
Life Cycle ◽  
Mediterranean Sea ◽  
Bizerte Lagoon ◽  
Southern Mediterranean

Life cycle of Bougainvillia nana (Cnidaria: Hydrozoa: Bougainvilliidae) from Italy, including a discussion of Bougainvillia muscus in the Mediterranean Sea

2007 ◽  
Vol 87 (4) ◽  
pp. 853-857 ◽  
Author(s):  
Francesco Denitto ◽  
Maria Pia Miglietta ◽  
Ferdinando Boero
Keyword(s):  
New Species ◽  
Life Cycle ◽  
Mediterranean Sea ◽  
Entire Life ◽  
Entire Life Cycle ◽  
Complete Life Cycle ◽  
Southern Mediterranean ◽  
Polyp Stage ◽  
A New Species ◽  
Medusa Stage

The life cycle of a species of the genus Bougainvillia (Cnidaria: Hydrozoa), found in the southern Mediterranean Sea, Italy, is here described. Hydroid colonies produced immature medusae with two tentacles and two ocelli per bulb and four unbranched oral tentacles. The number of tentacles and ocelli, which remained constant during the entire life cycle, are here considered diagnostic characters to identify the present as a new species. Female medusae lived up to 47 days (with an average of 30 days) when reared at 17°C, while males, reared at the same temperature, were short-lived, concluding their life cycle in no more than 15 days. The medusa of this species resembles B. ramosa var. nana described by Hartlaub in 1911 on the basis of few specimens and no polyp stage. After the complete life cycle has been observed, and given its peculiar medusa stage, Hartlaub's subspecies (variant) must be promoted to species rank as Bougainvillia nana.

Alexandrium pacificum Litaker sp. nov (Group IV): Resting cyst distribution and toxin profile of vegetative cells in Bizerte Lagoon (Tunisia, Southern Mediterranean Sea)

Harmful Algae ◽  
2015 ◽  
Vol 48 ◽  
pp. 69-82 ◽  
Author(s):  
Mouna Fertouna-Bellakhal ◽  
Amel Dhib ◽  
Afef Fathalli ◽  
Meher Bellakhal ◽  
Nicolas Chomérat ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Group Iv ◽  
Bizerte Lagoon ◽  
Vegetative Cells ◽  
Resting Cyst ◽  
Southern Mediterranean

scholarly journals Population dynamics and predatory impact of the alien jellyfish Aurelia solida (Cnidaria, Scyphozoa) in the Bizerte Lagoon (southwestern Mediterranean Sea)

2020 ◽  
Vol 21 (1) ◽  
pp. 22 ◽  
Author(s):  
SONIA K.M. GUEROUN ◽  
JUAN CARLOS MOLINERO ◽  
STEFANO PIRAINO ◽  
MOHAMED NEJIB DALY YAHIA
Keyword(s):  
Population Dynamics ◽  
Mediterranean Sea ◽  
Standing Stock ◽  
Early Summer ◽  
Grazing Impact ◽  
Calanoid Copepods ◽  
Bizerte Lagoon ◽  
Different Temperatures ◽  
Predatory Impact ◽  
The Impact

Understanding the life cycle strategies and predatory impact of alien jellyfish species is critical to mitigate the impact these organisms may have on local populations, biodiversity, and ultimately on the functioning of food webs. In the Mediterranean Sea, little is known about the dynamics of alien jellyfish, although this area is a biodiversity hotspot and one of the most threatened by an increasing number of alien jellyfish. Here, we investigated the population dynamics and predatory impact of a non-indigenous scyphomedusa, Aurelia solida Browne 1905, in the Bizerte Lagoon, Tunisia. The study was based on a bimonthly survey performed over two consecutive years, from November 2012 to August 2014. Field observations showed that the planktonic phase of A. solida occurs from winter to early summer. Prey composition was investigated by means of gut content and field zooplankton analyses. Calanoid copepods, mollusc larvae and larvaceans represented the main food items of A. solida. To determine the jellyfish feeding rate and their predatory impact on zooplankton populations, the digestion time for zooplankton prey was assessed at three different temperatures: 13, 18 and 23 °C in laboratory conditions, corresponding to the average range of temperatures encountered by A. solida in the Bizerte Lagoon. We found that A. solida consumed 0.5–22.5% and 0.02–37.3% of the daily zooplankton standing stock in 2013 and 2014, respectively. These results indicate a non-negligible but restricted seasonal grazing impact on some mesozooplankton groups, explained by the relatively short lifespan of the medusa stage (5–6 months).

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