Pacific Spirorbids In The East Atlantic

1980 ◽  
Vol 60 (2) ◽  
pp. 461-464 ◽  
Author(s):  
E. W. Knight-Jones ◽  
Phyllis Knight-Jones
Keyword(s):  
Canary Islands ◽  
Mediterranean Species ◽  
East Atlantic ◽  
Volcanic Islands ◽  
Almost All

The faunas of volcanic islands must necessarily be introduced, and more recent introductions can be recognized by the patterns of their distributions. This is obvious in the Canary Islands, where we have spent 30 days studying distributions of Spirorbidae. We now regard these as a distinct family following Pillai (1970). We sampled all the major islands, by shore collecting and diving to about 10 m, and on almost all we found nine Mediterranean species, namely Protolaeospira striata (Quiévreux, 1963) and the eight opercular incubators (species of Pileolaria and Janua) that have been recorded from both Marseilles (Zibrowius, 1968) and Chios (Bailey, 1969).

First study of the bat fossil record of the mid-Atlantic volcanic islands

2021 ◽  
pp. 1-15
Author(s):  
Javier GONZÁLEZ-DIONIS ◽  
Carolina CASTILLO RUIZ ◽  
Penélope CRUZADO-CABALLERO ◽  
Elena CADAVID-MELERO ◽  
Vicente D. CRESPO
Keyword(s):  
Atlantic Ocean ◽  
Iberian Peninsula ◽  
Central Europe ◽  
Canary Islands ◽  
Fossil Record ◽  
Dental Morphology ◽  
Lava Tubes ◽  
El Hierro ◽  
Volcanic Islands ◽  
Fossil Data

ABSTRACT Bats are one of the most abundant and important mammals in ecosystems. However, their fossil record is scarce and fragile, making them difficult to find. Accordingly, there is no record of this group in the volcanic islands of the mid-Atlantic Ocean apart from the Canary Islands. This paper studies the first bat fossil record of the Canary Islands (Spain). The material studied is found within two Quaternary lava tubes, Cueva de los Verdes on Lanzarote and Cueva Roja on the island of El Hierro. The dental and humeral morphology and biometry are analysed and compared with current specimens. Among our results we highlight the first fossil data of two species endemic to the islands of the mid-Atlantic Ocean, Plecotus teneriffae and Pipistrellus maderensis, the former from the Canary Islands and the latter from the Azores, Madeira and the Canary Islands. We also confirm the presence of Pipistrellus kuhlii in the fossil record of the island of Lanzarote. No differences are observed between the dental morphology of the current and the fossil populations of P. maderensis and Pl. teneriffae. In the case of P. kuhlii, the populations of the Canary Islands and the Iberian Peninsula show differences in the paraconule with respect to the populations from central Europe. Palaeoecological studies of these taxa suggest that these islands presented a similar habitat when the sites were formed to the present-day habitat.

scholarly journals Island Colonization: The Origin and Development of Island Communities

2009 ◽  
Vol 15 (1) ◽  
pp. 75
Author(s):  
Jarrad Cousin
Keyword(s):  
Island Biogeography ◽  
Extinction Risk ◽  
Island Colonization ◽  
Island Communities ◽  
Theory Of Island Biogeography ◽  
Successional Stages ◽  
Ideal Study ◽  
Volcanic Islands ◽  
Almost All ◽  
Study Unit

The theory of island biogeography revolutionized the study of island colonization and extinction. Since its inception in the 1960?s, it has allowed scientists and historians alike to understand reasons for patterns of species distributions on islands, as well as assisting conservation managers to model extinction risk of species populations on isolated islands. Volcanic islands represent a ?tabula rasa?, or clean slate for the study of island biogeography, as invariably, resultant volcanic activity decimates almost all observable life. As such, they form the ideal study unit for examining colonization of islands. The Krakatua eruption of 1883 is such an example, with the resultant blasts scouring the Krakatua islands of almost all life, thus allowing scientists to track the colonisation and successional stages that followed. Another example is Surtsey Island, which emerged from the sea 40 km south of Iceland in 1963. It represented a unique opportunity to examine colonization of a previously non-existent and thus uninhabited island. Given that there are many influences and avenues governing the origin and colonization of life on islands, Island Colonization: The Origin and Development of Island Communities, edited by Tim New, represents an important book compiling information on this topic.

scholarly journals Les pêches de l’URSS dans l’Atlantique du Nord-Est et l’élargissement des zones de pêche exclusive

2005 ◽  
Vol 18 (1) ◽  
pp. 107-126
Author(s):  
François Carré
Keyword(s):  
Barents Sea ◽  
East Atlantic ◽  
North East ◽  
The North ◽  
The Barents Sea ◽  
Average Production ◽  
Capelin Mallotus Villosus ◽  
Access Rights ◽  
The Baltic ◽  
Almost All

After the last war, the USSR set it self to increase the development of its ocean fisheries from its two North-East Atlantic seaboards on the Barents Sea and the Baltic. With a modernized fleet and almost complete freedom on the seas, its catch increased six fold between 1950 and 1976, going from 0,4 to 2,5 million tons per year, and Soviet fishermen could be found roaming on all the seas bordering Europe. However, as from 1977, this expansion was fiercely curtailed when coastal nations, including the USSR, established the 200-mile exclusive economic zone (EEZ) or mere exclusive fishing zone (EFZ), each being alloted almost all of its living resource s. More fishing grounds were lost by the USSR than gained, to the point where production suddenly fell in 1977 and it had to turn to fish of lesser quality, often used for industrial purposes, such as the Capelin (Mallotus villosus) and the blue Whiting (Micromesistius poutassou) which today make up to 60 % of all its catch off Northern Europe. The Soviet authorities reacted with flexibility and diversity, namely by increased fishing in the national exclusive zone, particularly in the Barents Sea, through negotiations leading to access rights to foreign waters, particularly those of Norway and the Faeroe Islands, and through a policy whereby it could purchase unprocessed fish from some members of the EEC. Thus Russian factory ships came to the British coasts to process mackerel delivered to them at sea by English and Scottish fishermen. It is through such a strategy of diversification, various examples of which may be found around the world, that the Soviets have succeeded in regaining grounds lost in 1977 and in reaching an average production of 1,7 million tons from 1977 to 1983 in the North-East Atlantic, this being 3 to 4 % less than that of 1970-76, notwithstanding the few purchases of fish made directly at sea.

The Mediterranean species of genus Loxosceles Heineken & Lowe, 1832 (Araneae: Sicariidae): Loxosceles imazighen sp. n. from Morocco and first description of the female of L. mrazig Ribera & Planas, 2009 from Tunisia

Zootaxa ◽  
2021 ◽  
Vol 5071 (3) ◽  
pp. 326-348
Author(s):  
MARC MASSA ◽  
CARLES RIBERA
Keyword(s):  
New Species ◽  
Canary Islands ◽  
Endemic Species ◽  
Phylogenetic Analyses ◽  
Morphological Variability ◽  
Mediterranean Species ◽  
Molecular Phylogenetic ◽  
Different Populations ◽  
First Time ◽  
A New Species

The aim of this paper is to describe a new species of the genus Loxosceles Heineken & Lowe, 1832 from Morocco, Loxosceles imazighen sp. n., and to describe for the first time a female of Loxoxceles mrazig Ribera & Planas, 2009 from Tunisia. Both species live in xeric and desert environments and are located in southern Atlas Range. Molecular phylogenetic analyses, using mitochondrial (cox1, 16S) and nuclear (H3, 28S) markers, revel that these species are closely related and that they constitute a separate evolutionary lineage of L. rufescens (Dufour, 1820) and of the set of endemic species of the Canary Islands. L. imazighen sp. n. differs from L. mrazig, the closest species morphologically and geographically, in the shapes and proportions of the male palpal tibia and the shapes and dispositions of the female seminal receptacles. In addition, L. mrazig females show morphological variability in their genitalia, mainly in the inner and outer lobes. Although that variability cannot be associated with different populations, since it also appears within individual populations, and is not related to genetic or geographic distances.  

Notes on the biology of the deep-sea crab Paramola cuvieri (Risso, 1816) (Decapoda, Homolidae) in the Canary Islands (central-east Atlantic)

Crustaceana ◽  
2014 ◽  
Vol 87 (1) ◽  
pp. 1-18 ◽  
Author(s):  
J. J. Castro ◽  
V. Hernández-García ◽  
A. T. Santana-Ortega ◽  
J. A. Martí-Trujillo ◽  
Y. Pérez-González ◽  
...  
Keyword(s):  
Canary Islands ◽  
Deep Sea ◽  
Depth Distribution ◽  
Depth Interval ◽  
East Atlantic ◽  
Significant Difference ◽  
Trap Catches

The box crab (Paramola cuvieri) was relatively frequent in trap catches from 288 to 906 m depth off the Canary Islands (central-east Atlantic), the greatest abundance being recorded between 400 and 700 m. From winter to the beginning of summer, a displacement of adult crabs from deeper waters (800 m) to areas of intermediate depths (600 m) was noted, probably due to reproductive requirements. Although no significant difference was observed in the depth distribution by sexes, larger females were generally caught at shallower depths and ovigerous specimens were mainly caught in the 350-400 m depth interval. Males were heavier, larger, and broader than females, but they were less abundant.

Aluminium distributions in Central East Atlantic waters (Canary Islands)

1996 ◽  
Vol 51 (4) ◽  
pp. 359-372 ◽  
Author(s):  
M.D. Gelado-Caballero ◽  
M.E. Torres-Padrón ◽  
J.J. Hernández-Brito ◽  
J.A. Herrera-Melián ◽  
J. Pérez-Peña
Keyword(s):  
Canary Islands ◽  
East Atlantic
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