scholarly journals Past connections with the mainland structure patterns of insular species richness in a continental‐shelf archipelago (Aegean Sea, Greece)

2021 ◽  
Author(s):  
Cyril Hammoud ◽  
Konstantinos Kougioumoutzis ◽  
Kenneth F. Rijsdijk ◽  
Stylianos M. Simaiakis ◽  
Sietze J. Norder ◽  
...  
Keyword(s):  
Species Richness ◽  
Continental Shelf ◽  
Aegean Sea ◽  
Structure Patterns

scholarly journals EGE DENİZİ’NDEKİ KARASULARI SORUNUNUN TÜRK VE ULUSLARARASI DENİZ TİCARETİ’NE ETKİLERİ

2018 ◽  
Vol 6 (3) ◽  
Author(s):  
Gökçe Çiçek CEYHUN
Keyword(s):  
Continental Shelf ◽  
Competitive Advantage ◽  
World Wide ◽  
Geographic Location ◽  
Aegean Sea ◽  
Energy Resources ◽  
Maritime Trade ◽  
Trade Policies ◽  
Transition Regime ◽  
Trade Routes

In today's world, one of the most fundamental strategies of states is to develop their competitive power by controlling energy lines and energy resources. Turkey, has high competitive advantage when compared to other countries especially in terms of geographic location. For this reason, Turkey has an attractive position in terms of the sharing of freight transport and having key role with maritime trade policies. Although maritime trade routes are legally free, such as transit and innocent passage, they are affected by the problem of sovereignty of sea areas. In particular, commercial routes to be followed by ships in controversial maritime areas have the potential to be influenced by a number of measures in favor of the coastal state in relation to the transition regime. Although in theory the freedom of transition is accepted, the conflicts between the coastal states in practice constitute an indicator of the big problems that can be experienced in the future. There are many world-wide problems in the coastal states such as territorial waters, continental shelf and exclusive economic zone. One of the most well-known problem is the ongoing territorial waters matter in the Aegean Sea between Greece and Turkey. In this study, the possible effects of the developments related to the limitation of territorial waters in the Aegean Sea to the maritime trade of our country and international maritime trade were evaluated. Within the scope of the research, in-depth literature was searched, the current situation was examined through maps related to maritime trade routes, and the possible scenarios were discussed and the study was terminated by presenting future measures and predictions.

Corrigendum to: Fish in the matrix: effects of landscape on community-structure patterns of the ichthyofauna of streams in Cerrado

2020 ◽  
Vol 71 (9) ◽  
pp. 1219
Author(s):  
Thiago Bernardi Vieira ◽  
Leandro Schlemmer Brasil ◽  
Naiara Raiol Torres ◽  
Tatiana Lima de Melo ◽  
Elto Aparecido Moreira ◽  
...  
Keyword(s):  
Land Use ◽  
Species Richness ◽  
Community Structure ◽  
Species Composition ◽  
Indicator Species ◽  
Matrix Effects ◽  
Native Vegetation ◽  
Generalist Species ◽  
The Matrix ◽  
Structure Patterns

This study aims to identify species richness and composition patterns of the ichthyofauna in different landscape matrices (forest, pasture and eucalypt crops) and to evaluate the variation of species composition in different matrices, identifying possible indicator species. We selected 21 streams; 7 were surrounded by native vegetation, 9 surrounded by pasture and 5 by eucalypt crops. We tested whether there was difference in the composition and species richness. In addition, we used the indicator value (IndVal) to verify if there were species faithful and specific to some land use and land cover. Streams located in forest presented the highest estimated species richness, followed by streams in pasturelands and eucalypt matrices. There was no difference between the composition of fishes in different matrices, but we observed a relationship between Phenacorhamdia somnians (Mees, 1974) and pasture matrix. The results indicated that the change in land use may benefit some generalist species such as Phenacorhamdia somnians.

Fish in the matrix: effects of landscape on community-structure patterns of the ichthyofauna of streams in Cerrado

2020 ◽  
Vol 71 (9) ◽  
pp. 1211 ◽  
Author(s):  
Thiago Bernardi Vieira ◽  
Leandro Schlemmer Brasil ◽  
Naiara Raiol Torres ◽  
Tatiana Lima de Melo ◽  
Elto Aparecido Moreira ◽  
...  
Keyword(s):  
Land Use ◽  
Species Richness ◽  
Community Structure ◽  
Species Composition ◽  
Indicator Species ◽  
Matrix Effects ◽  
Native Vegetation ◽  
Generalist Species ◽  
The Matrix ◽  
Structure Patterns

This study aims to identify species richness and composition patterns of the ichthyofauna in different landscape matrices (forest, pasture and eucalypt crops) and to evaluate the variation of species composition in different matrices, identifying possible indicator species. We selected 21 streams; 7 were surrounded by native vegetation, 9 surrounded by pasture and 5 by eucalypt crops. We tested whether there was difference in the composition and species richness. In addition, we used the indicator value (IndVal) to verify if there were species faithful and specific to some land use and land cover. Streams located in forest presented the highest estimated species richness, followed by streams in pasturelands and eucalypt matrices. There was no difference between the composition of fishes in different matrices, but we observed a relationship between Phenacorhamdia somnians (Mees, 1974) and pasture matrix. The results indicated that the change in land use may benefit some generalist species such as Phenacorhamdia somnians.

Quaternary continental shelf basins of Saronikos Gulf, Aegean Sea

2020 ◽  
Vol 40 (5) ◽  
pp. 629-647 ◽  
Author(s):  
Panagiotis M. Foutrakis ◽  
George Anastasakis
Keyword(s):  
Continental Shelf ◽  
Aegean Sea

Geoarchaeological challenges in the Cyclades continental shelf (Aegean Sea)

2009 ◽  
Vol 53 (1) ◽  
pp. 169-190 ◽  
Author(s):  
V. Kapsimalis ◽  
K. Pavlopoulos ◽  
I. Panagiotopoulos ◽  
P. Drakopoulou ◽  
D. Vandarakis ◽  
...  
Keyword(s):  
Continental Shelf ◽  
Aegean Sea

scholarly journals Biodiversity, Community Structural Shifts, and Biogeography of Prokaryotes within Antarctic Continental Shelf Sediment

2003 ◽  
Vol 69 (5) ◽  
pp. 2463-2483 ◽  
Author(s):  
John P. Bowman ◽  
Robert D. McCuaig
Keyword(s):  
Species Richness ◽  
Continental Shelf ◽  
Structural Changes ◽  
Sediment Surface ◽  
Small Subset ◽  
Shelf Area ◽  
The Core ◽  
Shelf Sediment ◽  
Antarctic Continental Shelf ◽  
Wide Range

ABSTRACT 16S ribosomal DNA (rDNA) clone library analysis was conducted to assess prokaryotic diversity and community structural changes within a surficial sediment core obtained from an Antarctic continental shelf area (depth, 761 m) within the Mertz Glacier Polynya (MGP) region. Libraries were created from three separate horizons of the core (0- to 0.4-cm, 1.5- to 2.5-cm, and 20- to 21-cm depth positions). The results indicated that at the oxic sediment surface (depth, 0 to 0.4 cm) the microbial community appeared to be dominated by a small subset of potentially r-strategist (fast-growing, opportunistic) species, resulting in a lower-than-expected species richness of 442 operational taxonomic units (OTUs). At a depth of 1.5 to 2.5 cm, the species richness (1,128 OTUs) was much higher, with the community dominated by numerous gamma and delta proteobacterial phylotypes. At a depth of 20 to 21 cm, a clear decline in species richness (541 OTUs) occurred, accompanied by a larger number of more phylogenetically divergent phylotypes and a decline in the predominance of Proteobacteria. Based on rRNA and clonal abundance as well as sequence comparisons, syntrophic cycling of oxidized and reduced sulfur compounds appeared to be the dominant process in surficial MGP sediment, as phylotype groups putatively linked to these processes made up a large proportion of clones throughout the core. Between 18 and 65% of 16S rDNA phylotypes detected in a wide range of coastal and open ocean sediments possessed high levels of sequence similarity (>95%) with the MGP sediment phylotypes, indicating that many sediment prokaryote phylotype groups defined in this study are ubiquitous in marine sediment.

Species richness, environmental heterogeneity and area: a case study based on land snails in Skyros archipelago (Aegean Sea, Greece)

2005 ◽  
Vol 32 (10) ◽  
pp. 1727-1735 ◽  
Author(s):  
K. A. Triantis ◽  
M. Mylonas ◽  
M. D. Weiser ◽  
K. Lika ◽  
K. Vardinoyannis
Keyword(s):  
Species Richness ◽  
Environmental Heterogeneity ◽  
Aegean Sea ◽  
Land Snails

Hydromedusae (Cnidaria: Hydrozoa) from the temperate southwestern Atlantic Ocean: a review

Zootaxa ◽  
2008 ◽  
Vol 1750 (1) ◽  
pp. 1 ◽  
Author(s):  
GENZANO GABRIEL ◽  
HERMES MIANZAN ◽  
JEAN BOUILLON
Keyword(s):  
Species Richness ◽  
Atlantic Ocean ◽  
Continental Shelf ◽  
New Records ◽  
South Atlantic Ocean ◽  
Valid Species ◽  
Southwestern Atlantic ◽  
Southwest Atlantic ◽  
Number Of Species ◽  
Southwestern Atlantic Ocean

Hydromedusae are one of the best-represented planktonic groups in waters of the South Atlantic Ocean in terms of species richness. Nevertheless, medusae of the region are inadequately known because earlier studies have been limited and restricted to few areas. During the last two decades, almost 2000 samples from 54 research cruises have been collected, mostly within the continental shelf of Argentina and Uruguay (33 – 55º S). These samples provide an opportunity to significantly augment knowledge of the richness of the medusa fauna in the southwest Atlantic. Forty species of hydromedusae (six of them new records for the area), including 15 of Anthomedusae, 14 of Leptomedusae, three of Limnomedusae, four of Narcomedusae, and four of Trachymedusae, were identified. Our results indicate that previous lists overestimated species richness of hydromedusae in the area. When misidentifications, updated species synonymies, and doubtful records are taken into account, 71 valid species are recognized here from the study area. Based upon this corrected inventory list, the data suggest that the number of species of hydromedusae decreases markedly with increasing latitude, corresponding with that observed in other planktonic groups of invertebrates.

scholarly journals New Laonice species (Polychaeta: Spionidae) from western and northern Australia

Zootaxa ◽  
2011 ◽  
Vol 2903 (1) ◽  
pp. 1 ◽  
Author(s):  
ELIZABETH GREAVES ◽  
KARIN MEIßNER ◽  
ROBIN WILSON
Keyword(s):  
Species Richness ◽  
Continental Shelf ◽  
Continental Margin ◽  
Marine Invertebrate ◽  
Individual Variability ◽  
Northern Australia ◽  
Morphological Similarity ◽  
Invertebrate Fauna ◽  
Additional Species ◽  
Australian Species

Species belonging to the genus Laonice (Polychaeta: Spionidae) from continental shelf and slope depths off western and northern Australia are described. Three species are new to science (L. lemniscata, L. insolita, L. pectinata), two additional species of uncertain identity are recognised from incomplete material and are similar to existing species. A key is provided to allow identification of all six Laonice species known from Australia. Also, a new standard for the observation of hooded hooks in Laonice is established. One of the Australian species, L. quadridentata, belongs to a group of Laonice species with fused prostomium and peristomium. These species are of great morphological similarity and several are reported to exhibit ontogenetic and individual variability and we discuss the significant taxonomic problems that are a consequence of that variability. The faunas of the continental margin of western and northern Australia were poorly sampled prior to the extensive surveys that generated our study material; this study and other current work suggests that our present estimates of species richness of the Australian marine invertebrate fauna significantly underestimate species richness, perhaps by as much as 50%.

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