Genetic   structure   of   the   high   dispersal   Atlanto-Mediterreanean   sea   star Astropecten aranciacus revealed by mitochondrial DNA sequences and microsatellite loci.

Marine Biology 156(4): 597-610

Abstract:

To investigate the impact of potential marine barriers on gene flow in high dispersal marine invertebrates, we assessed the population genetic structure of the sea star Astropecten aranciacus. Samples were obtained from nine locations within the Atlantic and the Mediterranean Sea including populations east of the Siculo-Tunisian Strait. We obtained both DNA sequence data of the mitochondrial control region and genotype data at four microsatellite loci. Both markers were highly polymorphic and showed a great level of genetic diversity. Genetic differentiation between populations (FST) was in general low, particularly for nuclear data, as is often the case in high dispersal marine invertebrates. Nevertheless, both marker sets indicated a significant genetic differentiation of the population from the island of Madeira to most other populations. Our results also demonstrate a clear pattern of isolation-by-distance supported by both mitochondrial and nuclear markers. Therefore, we conclude that larval dispersal of A. aranciacus is somewhat limited even within the basins of the Atlantic, the west Mediterranean and the east Mediterranean. Microsatellite loci further revealed genetic differentiation between the three basins; however, it is not clear whether this is truly caused by marine barriers. Genetic differentiation between basins might also be a result of isolation-by-distance allowing for any grouping to be significant as long as geographical neighbors are clustered together. Although levels of genetic differentiation were less pronounced in microsatellite data, both datasets were coherent and revealed similar patterns of genetic structure in A. aranciacus.

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Freitag, 21 August 2020 08:46

BURLA, J., PABST, B. & STAHEL, W. (1976)

Vorkommen von Astropecten aranciacus (Asteroidea, Echinodermata) in Abhängigkeit von Umweltbedingungen.

Environmental conditions affecting the occurrence of Astropecten aranciacus (Asteroidea, Echinodermata).

Helgoländer wissenschaftliche Meeresuntersuchungen 28: 167–182

Zusammenfassung:

  1. Astropecten aranciacus L. ist die größte von sechs Arten der Gattung, die im Mittelmeer nachgewiesen sind. Dieser Seestern lebt auf Sedimentböden; die obere Grenze des Vorkommens findet sich auf etwa drei Meter Tiefe.
  2. Auf 70 Stichprobenfeldern von je 25 m2 Fläche wurde die Individuenzahl von A. aranciacus zusammen mit biotischen und abiotischen Bedingungen registriert. Das Untersuchungsgebiet lag zwischen 3 und 10 m Tiefe.
  3. Die statistische Datenauswertung ergab, daß die Abundanz von A. aranciacus mit zunehmender Tiefe und steigendem mittlerem Sandkorndurchmesser zunimmt. Von den biotischen Faktoren war die Anzahl Molluskenarten positiv, die Anzahl Echinocardien negativ mit der Abundanz von A. aranciacus korreliert.
  4. Die Bestandesdichte von A. aranciacus schwankte in dem heterogenen, mosaikartig gegliederten Biotop zwischen 0 und 12 Individuen je 100 m2. Im Mittel entfielen auf 100 m² 4 Seesterne. Der Radius R der Tiere variierte zwischen 7 und 15 cm.
  5. Die Makro-Infauna des Gebiets fiel durch geringe Abundanz auf. Bei den Mollusken betrug die durchschnittliche Bestandesdichte 36 Tiere pro m2. Dagegen war die Arten-Diversität groß: In Infaunenproben von gesamthaft 17,5 m2 Fläche fanden sich 37 Molluskenarten.

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Dienstag, 18 August 2020 15:51

DULČIĆ, J. & TUTMAN, P. (2012)

Northernmost record of the shamefaced crab Calappa granulata (Linnaeus, 1767) (Brachyura, Calappidae) in the Mediterranean area.

Crustaceana 85 (4/5):601-606. DOI: 10.2307/23212683.

Introduction:

The box crabs or shamefaced crabs (family Calappidae) are a distinctive group of marine crabs found in tropical and subtropical regions of the world. The family is best known for the shallow water genus Calappa with its unusual, shovel-shaped chelae. The shamefaced crab Calappa granulata is a sublittoral species known from the Mediterranean Sea and adjacent Atlantic Ocean from Portugal to Mauritania, including the Azores, Madeira, the Canary Islands, and the Cape Verde Islands. Spanò et al. (2004) reported that shamefaced crabs are distributed in all oceans, but particularly abundant in tropical waters and inhabiting a wide variety of bottoms (sandy, shell grit, hard rocks, and coral). In the Mediterranean, C. granulata occurs between 10 and 400 m (though not very common), while some authors noted it lives on sandy mud and muddy detritus at depths between 13 and 400-700 m. Typically, it burrows in inshore soft bottoms. The species can reach 10 cm CL (carapace length) and 9.2 cm CW (carapace width). In recent years, it has been found in the Mediterranean Sea at several locations: in the Gulf of Taranto (Ionian Sea) , in the Strait of Sicily , in the coastal waters of the Sea of Marmara, and in Edremit Bay (Aegean Sea). In the Adriatic Sea, it is very rare and has only been found in areas of the Southern and Middle Adriatic. The last records of this species were from the Southern Adriatic, during trawling operations in the framework of the E.U. Project MEDITS.

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On the coral-feeding habit of the sea star Peltaster placenta.

Marine Biodiversity 49: 2009–2012.

Abstract:

The predatory activity of the asteroid Peltaster placenta (Müller and Troschel, 1842) on the black coral Parantipathes larix (Esper, 1790) is here described for the first time based on video footage obtained during a Remotely Operated Underwater Vehicle (ROV) survey conducted in the Pontine Archipelago (Southern Tyrrhenian Sea, Mediterranean Sea). Feeding is carried out on the living coenenchyme of the basal axis and pinnules of the antipatharian and is confirmed by the occurrence of its cnidocysts in the sea star gut content. The chitinous skeletal parts of the black coral are left intact as bare tissue, which helps to relate colonies to the predation event. Among all black coral species present in the research area, P. placenta was observed grazing exclusively on P. larix, similarly to other goniasterids known to be deep-sea corallivores with a marked selectivity for their prey. The predatory behaviour of P. placenta was previously unknown. The extent of its feeding traces suggests a significant influence on benthic trophic relationships and, ultimately, on the functioning, structure and health status of deep Mediterranean black coral forests.

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Sonntag, 31 Dezember 2017 17:12

ÖZTOPRAK, B., DOĞAN, A. & DAĞLI, E. (2014)

Checklist of Echinodermata from the coasts of Turkey.

Turk. J. Zool. (2014) 38: 892-900; doi:10.3906/zoo-1405-82.

Abstract:

According to the benthic studies on echinoderms inhabiting the coasts of Turkey, a total of 91 echinoderm species belonging to 5 classes have  een reported. The Aegean Sea coast is represented by the highest number of species (76  species), followed  by  the Sea of Marmara (64 species), the Levantine Sea (51 species), and the Black Sea (17 species). Sixty-six echinoderm species were found on soft substrata,  while  8  species  were  reported  on  hard substrata and 17 species on both soft and hard substrata. The  majority of the echinoderm species (83 species) were found at depths ranging from 11 to 50 m, while a small number of species (8 species) were reported from the deeper bottoms (>600 m). Six echinoderm species (Asterias rubens, Amphiodia (Amphispina) obtecta, Ophiactis macrolepidota, Ophiactis savignyi, Diadema setosum, and Synaptula reciprocans) were regarded as alien species.

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Distribution and conservation of Dalmatolacerta oxycephala (Duméril & Bibron, 1839) in Croatia and Bosnia and Herzegovina.

Distribucija i zaštita Dalmatolacerta oxycephala (Duméril & Bibron, 1839) u Hrvatskoj i Bosni i Hercegovini.

Hyla 2014 (2): 20-33. ISSN: 1848-2007

Abstract:

The sharp snouted rock lizard, Dalmatolacerta oxycephala, is an endemic lizard of the Balkan Peninsula with 70% of its range found in Croatia and Bosnia and Herzegovina (B&H). The herpetological literature surprisingly yields scarce localized data. In this paper we summarize most, if not all, records found in literature, data from museum collections, our own field surveys and records of field researchers with reliable knowledge of D. oxycephala. All literature and new data are plotted and an updated distribution map for Croatia and B&H is given. The sharp snouted rock lizard occurs continuously over the southern areas of the region with new records increasing the known distribution towards the north and into the high mountainous regions. The species occupies a very wide set of habitats, from rocky shrubs at sea level (on islands) up to rocky mountain cliffs and gorges at 1400 m a.s.l. Overall seasonal activity was highest from April to June with strong affiliation to warm and dry habitats. The species has a large range, it is still very abundant and there is no direct evidence of population decline, therefore its IUCN regional status for Croatia should remain least concerned (LC) and near threatened (NT) for B&H.

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An Evaluation of the Taxonomic Validity of Testudo werneri.

Amphibia-Reptilia 28(3): 393-401. ISSN 01735373. http://dx.doi.org/10.1163/156853807781374728

Abstract:

The Egyptian tortoise Testudo kleinmanni was recently split into two species on the basis of apparent differences in shell morphology and markings. Testudo kleinmanni was restricted to areas west of the Nile river and a new form, T. werneri, was described which occurred east of the Nile river (Perälä, 2001). However, when the morphometric analysis on which this decision was based (Perälä, 2001) was adjusted to allow for experiment-wise Type I error, by using P-value corrections, the proportion of the 46 characters that differed significantly between the two populations fell from 36.9% to only 13% in males and from 39.1% to just 8.7% in females. We then conducted a new morphometric analysis using our own data set that showed minor significant variation in morphometric and plastron markings between populations. An analysis of mitochondrial DNA based on 393 base pairs of the 12S rRNA gene, also showed near uniformity of western and eastern populations. Genetic divergence was only 0.2%, with the only consistent difference being a single G – A substitution at position 205. Based on the revised interpretation of Perälä (2001) results, our morphometric analysis on our own data set, and the molecular evidence, the variation observed between populations is normal within a species and therefore T. werneri is not a distinct independent evolutionary lineage and should not be considered a separate species from T. kleinmanni.

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Donnerstag, 14 Juni 2018 06:45

SCHNEIDER, A. (2005)

Polyglott on tour - Kreta.

108 Seiten, zahlreiche Karten und Fotos. ISBN 3-493-56823-1. Polyglott Verlag GmbH, München. 1. Auflage (2014 ist eine Neuauflage erschienen)

Verlagstext:

Der benutzerfreundliche Polyglott mit innovativem Tourenkonzept bringt Sie zu den schönsten Reisezielen der griechischen Insel Kreta: Entdecken Sie mit Polyglott on tour die pastellfarbenen Häuser in Chania, das grandiose Wanderziel Samaria-Schlucht und die großartige Palastanlage von Knossos. Der Reiseführer enthält zusätzlich 16 Top-Touren, z.B. in den wilden Süden oder zur Lassithi Hochebene.

Die Reiseplanung gibt einen Überblick über die einzelnen Reiseregionen und stellt Ihnen die jeweils schönsten Touren vor - inklusive allem Sehens- und Erlebenswerten, Hotel-, und Strandtipps, zu Sport und Aktivitäten und Unterwegs mit Kindern. Im Teil Land und Leute erfahren Sie Bemerkenswertes von der Geschichte Kretas, zu Natur, den Menschen, Kunst und Kultur bis hin zu interessanten Festen und Veranstaltungen.

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Fish community structure and depth-related trends on the continental slope of the Balearic Islands (Algerian basin, western Mediterranean) Mediterranean).

Mar. Ecol. Prog. Ser. 171: 247-259

Abstract:

A total of 13 026 fishes belonging to 82 species and 43 famllies were collected in a continuous transect between depths of 200 and 1800 m south of the Baleanc Islands (Algerian basin, western Mediterranean). The analysis of 32 bottom trawls showed the existence of 4 groups associated with the upper slope (groups 1 and 2, from 200 to 400 and 400 to 800 m, respectivelv), middle slope (group 3, from 800 to 1400 m) and lower slope (group 4, below a depth of 1400 m) Thc differcnces in the mean values of the ecological parameters species richness, abundance, biomass and mean fish weight were also indicative of distinctive characteristics between these fish assemblages. Species richness decreased significantly with depth. The highest values of diversity corresponded to the samples from group 2. Biomass did not show any specific trend throughout the whole bathymetric range. Mean fish weight show 2 different trends along the continental slope: a bigger-deeper phenomenon at the upper 1000 to 1200 m depth. and a smaller-deeper phenomenon below this depth. Our results are compared with those obtained in the north Atlantic basin and in the western Mediterranean (Balearic basin), and the main factol-s affecting these deep-sea fish assemblages are discussed.

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Donnerstag, 14 Juni 2018 09:27

VAN DEN BERG, M. & ZAWADZKI, M. (2010)

Wiederentdeckung einer ausgestorben geglaubten Population der Baleareneidechse, Podarcis lilfordi (GÜNTHER, 1874) auf der Illa de Ses Mones (Balearen, Menorca, Spanien) in Sympatrie mit der Ruineneidechse, Podarcis siculus (RAFINESQUE-SCHMALTZ, 1810).

Die Eidechse, 21 (3): 65-74.

Zusammenfassung:

Es wird über die Wiederentdeckung einer Population der Baleareneidechse (Podarcis lilfordi) auf der im Hafen von Port d`Addaia gelegenen Insel Illa de Ses Mones berichtet, von der man annahm, sie sei in den 1990er-Jahren durch die eingeschleppte Ruineneidechse (Podarcis siculus) verdrängt worden. Neben Informationen zur Illa des Ses Mones wird zum ersten Mal über ein sympatrisches Vorkommen von P. lilfordi und P. siculus berichtet und die hier lebenden Eidechsen erstmalig beschrieben und abgebildet. Weiterhin wird auf die in der Literatur häufige Verwechslung der Insel Illot d'en Carbó mit der Illa des Ses Mones hingewiesen und schließlich die taxonomische Stellung der wiederentdeckten Podarcis lilfordi von der Illa de Ses Mones diskutiert.

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