scholarly journals Histological and Morphological Aspects of Reproduction in Male Blackspotted Smooth-HoundMustelus punctulatusin the Adriatic Sea (Eastern Mediterranean Sea)

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Romana Gračan ◽  
Gordana Lacković
Keyword(s):  
Adriatic Sea ◽  
Eastern Mediterranean ◽  
Seasonal Cycles ◽  
North Central ◽  
The North ◽  
Morphological Aspects ◽  
Maturation Stages ◽  
Seasonal Analysis ◽  
Sexually Mature ◽  
Mature Spermatozoa

We present first data on reproductive biology of male blackspotted smooth-houndMustelus punctulatusin the Adriatic Sea and first histological examination of gonads at different maturation stages and seasonal cycles for this species. We collected samples from 117 male specimens ofM. punctulatusranging in length from 44.6 to 126.5 cm, caught by commercial bottom trawls in the North-Central Adriatic Sea. Microscopic observation revealed a diametric development of testes, in which round-shaped spermatocysts have zonal arrangement, showing seven different stages of development. Males began to mature when they were between 61 and 88 cm body length, which was indicated by the presence of functional claspers or appearance of the spermatogenic cysts. While the smallest mature shark was only 80 cm long, all animals longer than 89 cm were sexually mature. The seasonal analysis of the testes indicated that mature spermatozoa dominated in testes during the first half of the year with a peak in May and June, after which followed less active period during July and August.

Genetic characterization of loggerhead turtle (Caretta caretta) individuals stranded and caught as bycatch from the North-Central Adriatic Sea

2010 ◽  
Vol 31 (1) ◽  
pp. 127-133 ◽  
Author(s):  
Fausto Tinti ◽  
Vincenzo Caputo ◽  
Silvia Franzellitti ◽  
Paola Nisi Cerioni ◽  
Carola Vallini ◽  
...  
Keyword(s):  
Adriatic Sea ◽  
Eastern Mediterranean ◽  
Genetic Relationships ◽  
Loggerhead Turtle ◽  
North Central ◽  
Mature Adults ◽  
The North ◽  
Control Region Sequences

AbstractThe North Adriatic Sea is considered a critical feeding and developmental area for Mediterranean loggerhead turtles. In this study, a comparative analysis of mitochondrial DNA control region sequences was carried out on sixty-five loggerhead individuals stranded and caught as bycatch in the Adriatic Sea from 1999 to 2002. We demonstrated the existence of genetic relationships between the North-Central Adriatic (NCA) aggregate and the Central-Eastern Mediterranean rookeries. Short-range and long-range migrations towards the Adriatic Sea were hypothesized by the finding of individuals bearing haplotypes endemic to the nesting populations of Greece and Turkey. The occurrence of individuals belonging to dimensional classes from juveniles to mature adults strongly support both the feeding and developmental role of the NCA.

scholarly journals Qualified temperature, salinity and dissolved oxygen climatologies in a changing Adriatic Sea

2014 ◽  
Vol 11 (1) ◽  
pp. 331-390
Author(s):  
M. Lipizer ◽  
E. Partescano ◽  
A. Rabitti ◽  
A. Giorgetti ◽  
A. Crise
Keyword(s):  
Dissolved Oxygen ◽  
Adriatic Sea ◽  
Eastern Mediterranean ◽  
Temporal Stability ◽  
The South ◽  
The North ◽  
Synthetic Temperature ◽  
Oxygen Utilisation ◽  
Oxygen Minimum

Abstract. An updated climatology, based on a comprehensive dataset (1911–2009) of temperature, salinity and dissolved oxygen, has been produced for the whole Adriatic Sea with the Variational Inverse Method using the DIVA software. Climatological maps were produced at 26 levels and validated with Ordinary Cross Validation and with real vs. synthetic Temperature–Salinity diagram intercomparison. The concept of Climatology–Observation Misfit (COM) has been introduced as an estimate of the physical variability associated with the climatological structures. In order to verify the temporal stability of the climatology, long-term variability has been investigated in the Mid Adriatic and the South Adriatic Pits, regarded as the most suitable records of possible long-term changes. Compared with previous climatologies, this study reveals a surface temperature rise (up to 2 °C), a clear deep dissolved oxygen minimum in the South Adriatic Gyre and a bottom summer oxygen minimum in the North Adriatic. Below 100 m all properties profoundly differ between the Middle and the South Adriatic. The South Adriatic Pit clearly shows the remote effects of the Eastern Mediterranean Transient, while no effect is observed in Middle Adriatic Pits. The deepest part of the South Adriatic seems now to be significantly saltier (+0.18 since the period 1911–1914, with an increase of +0.018 decade−1 since the late 1940s) and warmer (+0.54 °C since 1911–1914), even though a long-term temperature trend could not be statistically demonstrated. Conversely, the Middle Adriatic Pits present a long-term increase in apparent oxygen utilisation (+0.77 mL L−1 since 1911–1914, with a constant increase of +0.2 mL L−1 decade−1 after the 1970s).

scholarly journals Data Poor Approach for the Assessment of the Main Target Species of Rapido Trawl Fishery in Adriatic Sea

2021 ◽  
Vol 8 ◽  
Author(s):  
Enrico Nicola Armelloni ◽  
Martina Scanu ◽  
Francesco Masnadi ◽  
Gianpaolo Coro ◽  
Silvia Angelini ◽  
...  
Keyword(s):  
Adriatic Sea ◽  
Single Species ◽  
Fishing Effort ◽  
Biological Information ◽  
North Central ◽  
Trawl Fishery ◽  
The North ◽  
Harvest Control Rule ◽  
The Common ◽  
Common Sole

Information on stock status is available only for a few of the species forming the catch assemblage of rapido fishery of the North-central Adriatic Sea (Mediterranean Sea). Species that are caught almost exclusively by this gear, either as target (such as Pectinidae) or accessory catches (such as flatfishes apart from the common sole), remain unassessed mainly due to the lack of data and biological information. Based on cluster analysis, the catch assemblage of this fishery was identified and assessed using CMSY model. The results of this data-poor methodology showed that, among the species analyzed, no one is sustainably exploited. The single-species CMSY results were used as input to an extension of the same model, to test the effect of four different harvest control rule (HCR) scenarios on the entire catch assemblage, through 15-years forecasts. The analysis showed that the percentage of the stocks that will reach Bmsy at the end of the projections will depend on the HCR applied. Forecasts showed that a reduction of 20% of fishing effort may permit to most of the target and accessory species of the rapido trawl fishery in the Adriatic Sea to recover to Bmsy levels within 15 years, also providing a slight increase in the expected catches.

scholarly journals Drivers of the decadal variability of the North Ionian Gyre upper layer circulation during 1910–2010: a regional modelling study

2021 ◽  
Author(s):  
Feifei Liu ◽  
Uwe Mikolajewicz ◽  
Katharina D. Six
Keyword(s):  
Ocean Circulation ◽  
Adriatic Sea ◽  
Decadal Variability ◽  
Eastern Mediterranean ◽  
Circulation Model ◽  
Atmospheric Forcing ◽  
Sensitivity Experiment ◽  
Data Set ◽  
The North ◽  
Upper Layer Circulation

AbstractA long simulation over the period 1901–2010 with an eddy-permitting ocean circulation model is used to study the variability of the upper layer circulation in the North Ionian Gyre (NIG) in the Eastern Mediterranean Sea (EMed). The model is driven by the atmospheric forcing from the twentieth century reanalysis data set ERA-20C, ensuring a consistent performance of the model over the entire simulation period. The main modes of variability known in the EMed, in particular the decadal reversals of the NIG upper layer circulation observed since the late 1980s are well reproduced. We find that the simulated NIG upper layer circulation prior to the observational period is characterized by long-lasting cyclonic phases with weak variability during years 1910–1940 and 1960–1985, while in the in-between period (1940–1960) quasi-decadal NIG circulation reversals occur with similar characteristics to those observed in the recent decades. Our simulation indicates that the NIG upper layer circulation is rather prone to the cyclonic mode with occasional kicks to the anticyclonic mode. The coherent variability of the NIG upper layer circulation mode and of the Adriatic Deep Water (AdDW) outflow implies that atmospheric forcing triggering strong AdDW formation is required to kick the NIG into an anticyclonic circulation 1–2 years later. A sensitivity experiment mimicking a cold winter event over the Adriatic Sea supports this hypothesis. Our simulation shows that it is the multi-decadal variability of the salinity in the Adriatic Sea that leads to periods where low salinity prevents strong AdDW formation events. This explains the absence of quasi-decadal NIG reversals during 1910–1940 and 1960–1985.

scholarly journals Holocene Aridity-Induced Interruptions of Human Activity along a Fluvial Channel in Egypt’s Northern Delta

Quaternary ◽  
2021 ◽  
Vol 4 (4) ◽  
pp. 39
Author(s):  
Jean-Daniel Stanley ◽  
Tobias Ullmann ◽  
Eva Lange-Athinodorou
Keyword(s):  
North Atlantic ◽  
Nile Delta ◽  
Eastern Mediterranean ◽  
Regional Distribution ◽  
Anthropogenic Activity ◽  
The West ◽  
North Central ◽  
Source Areas ◽  
The North ◽  
Levantine Basin

Geoarchaeological information presented here pertains to a subsidiary Nile channel that once flowed west of the main Sebennitic distributary and discharged its water and sediments at Egypt’s then north-central deltaic coast. Periodical paleoclimatic episodes during the later Middle and Upper Holocene included decreased rainfall and increased aridity that reduced the Nile’s flow levels and thus likely disrupted nautical transport and anthropogenic activity along this channel. Such changes in this deltaic sector, positioned adjacent to the Levantine Basin in the Eastern Mediterranean, can be attributed to climatic shifts triggered as far as the North Atlantic to the west, and African highland source areas of the Egyptian Nile to the south. Of special interest in a study core recovered along the channel are several sediment sequences without anthropogenic material that are interbedded between strata comprising numerous potsherds. The former are interpreted here as markers of increased regional aridity and reduced Nile flow which could have periodically disrupted the regional distribution of goods and nautical activities. Such times occurred ~5000 years B.P., ~4200–4000 years B.P., ~3200–2800 years B.P., ~2300–2200 years B.P., and more recently. Periods comparable to these are also identified by altered proportions of pollen, isotopic and compositional components in different radiocarbon-dated Holocene cores recovered elsewhere in the Nile delta, the Levantine region to the east and north of Egypt, and in the Faiyum depression south of the delta.

Two-year study of lipophilic marine toxin profile in mussels of the North-central Adriatic Sea: First report of azaspiracids in Mediterranean seafood

Toxicon ◽  
2015 ◽  
Vol 108 ◽  
pp. 115-125 ◽  
Author(s):  
Simone Bacchiocchi ◽  
Melania Siracusa ◽  
Angela Ruzzi ◽  
Stefania Gorbi ◽  
Manuela Ercolessi ◽  
...  
Keyword(s):  
Adriatic Sea ◽  
North Central ◽  
First Report ◽  
The North ◽  
Marine Toxin

scholarly journals Distribution and some biological parameters of the red gurnard, Chelidonichthys cuculus (Actinopterygii, Scorpaeniformes, Triglidae) in the north-central Adriatic Sea

2014 ◽  
Vol 44 (3) ◽  
pp. 173-180
Author(s):  
Maria Vallisneri ◽  
Stefano Tommasini ◽  
Marco Stagioni ◽  
Chiara Manfredi ◽  
Igor Isajlović ◽  
...  
Keyword(s):  
Adriatic Sea ◽  
Biological Parameters ◽  
North Central ◽  
The North

scholarly journals Cretaceous δ13C stratigraphy and the age of dolichosaurs and early mosasaurs

2005 ◽  
Vol 84 (3) ◽  
pp. 257-268 ◽  
Author(s):  
L.L. Jacobs ◽  
K. Ferguson ◽  
M.J. Polcyn ◽  
C. Rennison
Keyword(s):  
Large Scale ◽  
Eastern Mediterranean ◽  
Eastern Mediterranean Region ◽  
Global Scale ◽  
North Central ◽  
The North ◽  
Depositional Settings ◽  
Isotopic Analyses ◽  
North Central Texas ◽  
Central Texas

AbstractSediments in north-central Texas, ranging in age from >117 to 85 Ma, represent a variety of terrestrial and marine depositional settings. Isotopic analyses of wood fragments found throughout the section allow correlation to the standard secular marine δ13C curve because of characteristic peaks at the Aptian-Albian and Cenomanian-Turonian boundaries. Consistency of the north-central Texas δ13C curve with the marine standard facilitates correlation among non-marine and marine environments on a global scale. Radiometrically dated ammonite zones recognised in Texas provide calibration for the Cenomanian and Turonian portions of the section. Cenomanian and Turonian sediments in north-central Texas preserve the oldest (96 Ma) and the youngest (<85 Ma) well-documented Coniasaurus, a dolichosaur also known from the southern North Sea Basin during that interval. Haasiasaurus, the oldest known well-documented early mosasaur, is found at ‘Ein Yabrud, Israel (98 Ma), followed by other poorly dated Cenomanian taxa from the eastern Mediterranean region, and then by Dallasaurus turneri and Russellosaurus coheni in Texas (92 Ma) and Tethysaurus (90.5 Ma) in Morocco. Neither shifts in δ13C nor large-scale sea level change seem to have influenced dolichosaur or mosasaur evolution in substantial ways during the Cenomanian and Turonian stages.

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