Isolation and Insulation, 22000 BC–3000 BC

Author(s):  
David Abulafia

Carved out millions of years before mankind reached its coasts, the Mediterranean Sea became a ‘sea between the lands’ linking opposite shores once human beings traversed its surface in search of habitation, food or other vital resources. Early types of humans inhabited the lands bordering the Mediterranean 435,000 years before the present, to judge from evidence for a hunters’ camp set up near modern Rome; others built a simple hut out of branches at Terra Amata near Nice, and created a hearth in the middle of their dwelling – their diet included rhinoceros and elephant meat as well as deer, rabbits and wild pigs. When early man first ventured out across the sea’s waters is uncertain. In 2010, the American School of Classical Studies at Athens announced the discovery in Crete of quartz hand-axes dated to before 130,000 BC, indicating that early types of humans found some means to cross the sea, though these people may have been swept there unintentionally on storm debris. Discoveries in caves on Gibraltar prove that 24,000 years ago another species of human looked across the sea towards the mountain of Jebel Musa, clearly visible on the facing shore of Africa: the first Neanderthal bones ever discovered, in 1848, were those of a woman who lived in a cave on the side of the Rock of Gibraltar. Since the original finds were not immediately identified as the remains of a different human species, it was only when, eight years later, similar bones were unearthed in the Neander Valley in Germany that this species gained a name: Neanderthal Man should carry the name Gibraltar Woman. The Gibraltar Neanderthals made use of the sea that lapped the shores of their territory, for their diet included shellfish and crustaceans, even turtles and seals, though at this time a flat plain separated their rock caves from the sea. But there is no evidence for a Neanderthal population in Morocco, which was colonized by homo sapiens sapiens, our own branch of humanity. The Straits apparently kept the two populations apart.

Ocean Science ◽  
2013 ◽  
Vol 9 (2) ◽  
pp. 301-324 ◽  
Author(s):  
K. Schroeder ◽  
C. Millot ◽  
L. Bengara ◽  
S. Ben Ismail ◽  
M. Bensi ◽  
...  

Abstract. The long-term monitoring of basic hydrological parameters (temperature and salinity), collected as time series with adequate temporal resolution (i.e. with a sampling interval allowing the resolution of all important timescales) in key places of the Mediterranean Sea (straits and channels, zones of dense water formation, deep parts of the basins), constitute a priority in the context of global changes. This led CIESM (The Mediterranean Science Commission) to support, since 2002, the HYDROCHANGES programme (http//www.ciesm.org/marine/programs/hydrochanges.htm), a network of autonomous conductivity, temperature, and depth (CTD) sensors, deployed on mainly short and easily manageable subsurface moorings, within the core of a certain water mass. The HYDROCHANGES strategy is twofold and develops on different scales. To get information about long-term changes of hydrological characteristics, long time series are needed. But before these series are long enough they allow the detection of links between them at shorter timescales that may provide extremely valuable information about the functioning of the Mediterranean Sea. The aim of this paper is to present the history of the programme and the current set-up of the network (monitored sites, involved groups) as well as to provide for the first time an overview of all the time series collected under the HYDROCHANGES umbrella, discussing the results obtained thanks to the programme.


2016 ◽  
Vol 59 (2-3) ◽  
Author(s):  
Conxi Rodríguez-Prieto

AbstractLaboratory experiments were set up in order to assess light and temperature requirements for survival, growth and reproduction of specimens of


2020 ◽  
Author(s):  
Ronja Ebner ◽  
Paul Meijer

<p>Although the Mediterranean is known for its equable climate, this does not apply on geological timescales. At the end of the Miocene, salinity of the Mediterranean Sea exceeded gypsum and halite saturation, leading to the youngest known salt giant to form in a relatively short time span. This event is called the Messinian Salinity Crisis. Insight into the exact circumstances leading to this extreme situation would increase our understanding of today’s system and how it would react to climatic changes. Some of the theories rely on a drastic change in circulation, leading to a stably stratified water column at high salinities. It is yet to be determined how realistic these ideas are.</p><p>Conceptual box models can help to find answers to this. In a previous study it was already shown that a decrease in the rate of deep water formation in the margins can lead to a stratified water column. Here we used a predefined value for the overturning. In contrast, in the present study, the circulation, including the exchange through the strait of Gibraltar, is dynamically driven by density differences. By modelling stratification for various assumptions regarding the efficiency of the strait of Gibraltar, evaporation and the connectivity of the margins, this set-up ables us to get in-depth insights regarding the system in general, and the influence of climate and bathymetry on the circulation, specifically.</p><p>This model brings us one step closer to an understanding of the circumstances of this extreme state of the Mediterranean Sea</p>


2020 ◽  
Vol 61 (2) ◽  
pp. 113-134
Author(s):  
Giambattista Bello ◽  
Franco Andaloro ◽  
Pietro Battaglia

The present review critically assesses the records of cephalopods that have entered the Mediterranean Sea in the last few decades. It includes 13 species, namely Sepia dollfusi, Stoloteuthis leucoptera, Sepioteuthis lessoniana, Architeuthis dux, Cranchia scabra, Taonius pavo, Megalocranchia sp., Teuthowenia megalops, Cycloteuthis sirventi, Taningia danae, Octopus cyanea, Amphioctopus sp. and Tremoctopus gracilis. The presence of Sepia pharaonis needs to be confirmed, whereas that of Sepia gibba and Spirula spirula is excluded. The arrivals from the Atlantic Ocean through the Strait of Gibraltar are related to the entrance surface current, which either carried passively planktonic paralarvae or favoured in some other way the entrance of subadult and adult stray specimens. As a matter of fact, all Atlantic cephalopods are pelagic oegopsid squids, with the exception of the nekto-benthic sepiolid S. leucoptera; all of them have been found only in the western Mediterranean basin. None of them seemingly established a stable population there, apart from the latter species. On the contrary, the cephalopods entering the Mediterranean from the Red Sea through the Suez Canal (Lessepsian migrants) lead a benthic mode of life. At least two of them, namely S. lessoniana and Amphioctopus sp., set up stable populations in the eastern basin. Lastly the occurrences of the pelagic octopod T. gracilis are ascribed, in the literature, to human-mediated transfer.


2014 ◽  
Vol 16 (1) ◽  
pp. 31 ◽  
Author(s):  
M. GONZALEZ-WANGUEMERT ◽  
J. COSTA ◽  
L. BASSO ◽  
C. DUARTE ◽  
E. SERRÃO ◽  
...  

Pinna nobilis is an endemic bivalve of the Mediterranean Sea whose populations have decreased in the last decades due to human pressure; as consequence, it was declared a protected species in 1992. Despite its conservation status, few genetic studies using mitochondrial markers have been published. We report on the isolation and development of 10 microsatellite loci for the fan mussel, Pinna nobilis. All loci (2 di-nucleotide, 5 tri-nucleotide, 2 tetra-nucleotide and 1 penta-nucleotide) are characterized by high polymorphism levels in 76 individuals tested from two populations in Balearic Islands (Spain, Western Mediterranean Sea). Number of alleles ranged from 4 to 24 and expected heterozygosity ranged from 0.4269 to 0.9400. These microsatellites could be very useful to assess the genetic diversity and connectivity patterns of P. nobilis and to establish new conservation strategies.


2020 ◽  
Vol 10 (4) ◽  
pp. 834-849
Author(s):  
Claudia Jiménez Cortés

Son miles las personas que se juegan la vida por cruzar el Mediterráneo hacia un futuro incierto pero prometedor. En el trayecto –que dura años– pasan a estar a merced de los grupos organizados para quienes son mera “mercancía” de la cual pueden obtener un beneficio… o dos: el que paga la persona o sus familiares por llegar al viejo continente y su explotación por el camino. Esta cosificación hace que la delgada línea que separa el tráfico del delito de trata de seres humanos se difumine cuando no desaparezca. Ante esta realidad, el artículo propone un cambio de enfoque respecto al hasta ahora seguido por las autoridades. Con ello, quizá se consiga luchar de manera más eficiente contra esta lacra y en todo caso, al menos se aseguraría un trato más digno y humano a personas que han sufrido en sus carnes el escarnio de no ser consideradas ni tratadas como lo que son, seres humanos. Thousands of people risk their lives to cross the Mediterranean Sea towards an uncertain but promising future. In their journey, they are at the mercy of the organized groups who consider them no more than merchandise from which they can obtain a benefit... or two: one from the person or their relatives for reaching the old continent and one from their exploitation. This “use” of them makes the thin line that separates smuggling from the crime of trafficking in human beings blur if not disappear. Given this reality, the article proposes to focus the persecution on the mafias that have made a profit with their exploitation. With this, perhaps it is possible to fight in a more efficient way and in any case, at least a more dignified and humane treatment would be ensured to people who have suffered the scorn of not being considered or treated as what they are, human beings.


2015 ◽  
Vol 116 (1) ◽  
pp. 69-74 ◽  
Author(s):  
L Pérez ◽  
ML Abarca ◽  
F Latif-Eugenín ◽  
R Beaz-Hidalgo ◽  
MJ Figueras ◽  
...  

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