scholarly journals Rasprostranjenost nezavičajne vrste kamenice Magallana gigas(Thunberg, 1793) duž istočne obale Jadrana

2019 ◽  
Vol 60 (2) ◽  
pp. 137-146 ◽  
Author(s):  
Daria Ezgeta-Balić ◽  
Tanja Šegvić-Bubić ◽  
Elizabeta Briski ◽  
Leon Grubišić ◽  
Dubravka Bojanić Varezić ◽  
...  
Keyword(s):  
Native Species ◽  
Littoral Zone ◽  
Adriatic Sea ◽  
Invasion Success ◽  
Subtidal Zone ◽  
Anthropogenic Habitats ◽  
The North ◽  
North Eastern ◽  
Zone Ii ◽  
The 1960S

Non-native Pacific oyster Magallana gigas (Thunberg, 1793) was introduced to the Mediter-ranean Sea for aquaculture purposes in the 1960s. Although this species was not introduced for aquaculture to the Croatian part of the Adriatic Sea, in the 1970s, it was reported in the Lim Bay, in the North-eastern Adriatic. Until recently, there has been no research on the species in the Croatian part of the Adriatic. The aim of this research was to summarize existing and novel data on the distribution of M. gigas in coastal areas of the Eastern Adriatic and to provide a baseline for the future monitoring and assessment programmes of the species. Distribution of M. gigas was determined by three different methods: (i) a visual census of the presence of M. gigas specimens in the medio-littoral zone; (ii) DNA identification of M. gigas larvae in the water column; and (iii) the presence of M. gigas in the subtidal zone at depth between 25 and 40 m. Magallana gigas has a well-established population in the medio-littoral zone of natural and anthropogenic habitats along the coast of the North-eastern Adriatic Sea (west coast of Istria peninsula), but it is not present in the deeper layers . In the Central-eastern and South-eastern Adriatic Sea, the species was either absent or sporadically recorded with no evidence of fully established populations. Considering the great invasion success of M. gigas worldwide and effects that this species could have on the invaded ecosystem (e.g. competition for food and space with native species), detailed future monitoring is needed for the Eastern Adriatic Sea.

scholarly journals Cryptostegia Madagascariensis Alters the Litterfall and Nutrient Cycling of Litter Inputs in An Invaded Tropical Cambisol From North-Eastern Brazil

2021 ◽  
Author(s):  
Edjane Oliveira de Lucena ◽  
Tancredo Souza ◽  
Leonaldo Alves de Andrade ◽  
Lucas Jónatan Rodrigues da Silva ◽  
Lídia Klestadt Laurindo ◽  
...  
Keyword(s):  
Native Species ◽  
Chemical Properties ◽  
Nutrient Content ◽  
Riparian Areas ◽  
The North ◽  
Litter Decay ◽  
Eastern Brazil ◽  
North Eastern ◽  
Litter Deposition ◽  
Dry And Rainy Seasons

Abstract The invasive Cryptostegia madagascariensis occupies riparian areas covered by tropical Cambisols throughout the North-eastern Brazil however litter is known regarding its ability to impact litter inputs, and ecosystem processes. This study aimed to characterize the effects of the invader on the litter deposition, soil physical-chemical properties, litter nutrient content, and the litter decay rate in a Tropical Cambisol. Comparisons of native and invaded environments showed that C. madagascariensis alters the quantity of litter deposition during both dry and rainy seasons. In contrast to native species, C. madagascariensis litterfall displayed litter seasonal variation (rainy vs. dry season), however invaded sites had higher litter biomass compared to native sites. C. madagascariensis litter was enriched in soil organic matter, N, P, and K contents as compared to the native litter. Compared to native environments, invaded ones had significantly decreased soil temperature and soil water content. Results suggest that C. madagascariensis enhances litter and N, P, and K availability in ways that have potential to impact soil ecosystem in the Tropical Cambisols from Caatinga ecoregion, Brazil.

scholarly journals Changes in reindeer population numbers in Russia: an effect of the political context or of climate?

Rangifer ◽  
2013 ◽  
Vol 2 (1-App) ◽  
pp. 19 ◽  
Author(s):  
Konstantin B. Klokov
Keyword(s):  
Political Context ◽  
The Political ◽  
Atmospheric Circulation Patterns ◽  
The North ◽  
Common Ownership ◽  
Political Events ◽  
North Eastern ◽  
Reindeer Population ◽  
The 1960S ◽  
The Impact

This paper analyses trends in domesticated reindeer numbers at the federal, regional, and local levels based on official statistics and interviews with herders in different northern districts across Russia. During the second half of the last century, the domesticated reindeer population in Russia shifted dramatically from a maximum of 2.5 million head to a minimum of 1.2. The most important trends were connected to changes in social and economic conditions linked to government directives. Post-Soviet reforms in the 1990s resulted in a nearly 50% reduction in the total number of domesticated reindeer. However in some regions, these political events had the opposite effect. The contrast was due to the abilities of herders to adapt to the new conditions. A detailed analysis of these adaptations reveals an important difference between reindeer-holding enterprises with common ownership (i.e. kolkhozes, sovkhozes, municipal enterprises, etc.) and households with family owned reindeer. The paper concludes that the effect the political context is so large as to conceal the impact of other natural factors on reindeer populations such as climate change. However, a gradual increase of reindeer populations in the north-eastern part of Russia in the 1960s can be associated with changes in atmospheric circulation patterns.

The effect of salinity on aspects of the early development of the kelp species Undaria pinnatifida and Saccorhiza polyschides

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Victoria M. Crane ◽  
Marie-Fanny Racault ◽  
Robert L. Fletcher
Keyword(s):  
Native Species ◽  
Life Histories ◽  
Full Range ◽  
Salinity Range ◽  
Subtidal Zone ◽  
Female Ratio ◽  
Blade Length ◽  
The North ◽  
Saccorhiza Polyschides ◽  
Sporophyte Production

Abstract It is likely that the introduction of the brown macroalga Undaria pinnatfida from the Pacific into the North Atlantic will impact competitively on the native species Saccorhiza polyschides; both are large kelps occupying the same subtidal zone with very similar life histories. The present study examines their tolerance to changes in salinity, under laboratory conditions, in order to provide a better understanding of their respective competitiveness in an estuarine environment. Experiments were carried out over a full range of salinity values, from 35 to 0, with respect to zoospore settlement and attachment, germination, post-germination progression to form gametophytes, gametophyte sex ratio, sporophyte production and blade length. Undaria zoospores settled and attached over the salinity range from 35 to 14 and germinated between 35 and 3.5. Post-germination progression occurred over the range from 35 to 14 whilst only small differences in the male/female ratio were recorded. Sporophyte blade production and development occurred over the range from 35 to 17.5 and peak production and longest blade length was recorded at 21. Saccorhiza zoospores settled and attached at and above 24.5 and germinated between 35 and 21. Sporophyte production and blade development occurred over the range from 35 to 24.5. In general, Undaria was shown to be much more tolerant of reductions in salinity compared to Saccorhiza and is more likely to penetrate further into estuarine environments.

First Record of the Cornich Blackfish Schedophilus Medusophagus (Pisces: Centrolophidae) Larvae from the Adriatic Sea

1998 ◽  
Vol 78 (3) ◽  
pp. 1035-1038 ◽  
Author(s):  
Jakov Dulčić
Keyword(s):  
Adriatic Sea ◽  
First Record ◽  
Western Mediterranean ◽  
Western Atlantic ◽  
The North ◽  
Pelagia Noctiluca ◽  
North Eastern ◽  
The Town ◽  
North Western ◽  
Mesopelagic Species

The capture of the cornich blackfish, Schedophilus medusophagus, larvae from the Adriatic Sea represents an easterly extension in range of this species, and the first larval record in Adriatic waters.Schedophilus medusophagus Cocco, 1839, is a mesopelagic species from temperate waters of the north-eastern and north-western Atlantic and the western Mediterranean (Bini, 1968; Tortonese, 1975; Haedrich, 1986). The first record of this fish from the Adriatic Sea was reported in 1880 according to Ninni (1912). The second record was during the invasion of medusae Pelagia noctiluca (Malej, 1982; Rottini-Sandrini & Stravisi, 1982; Vučetić, 1982,1983) in Pelješac channel near the town of Korčula-island Koršula (central Adriatic) in 1982 (Onofri, 1986). Ten juvenile specimens, from 10·0 to 20·0cm total length (TL), were collected with medusae at 2m depth. This record Onofri (1986) connected with the ingression of inter-median waters (50–100 m) in the central Adriatic influenced the increase of salinity and temperature in 1982. Jardas (1996) noted that S. medusophagus is a very rare species in the Adriatic Sea.

scholarly journals Internal mobility in Italy: A new delay

Stanovnistvo ◽  
2014 ◽  
Vol 52 (2) ◽  
pp. 21-42
Author(s):  
Cecilia Reynaud ◽  
Enrico Tucci
Keyword(s):  
Geographical Area ◽  
Strong Increase ◽  
The South ◽  
The North ◽  
Population Loss ◽  
Northern Areas ◽  
North Eastern ◽  
Internal Mobility ◽  
The 1960S ◽  
North And South

From the second half of the 1990s, mobility appears to have changed profoundly from the great migrations of the 1960s, for two main reasons: firstly, the rise in short-range mobility; and secondly, the strong increase in attraction by geographical areas in Central and above all North-eastern Italy. In more recent years, the evolution of internal mobility has changed again, with a further fall coupled with a loss of attractiveness for some Central and Northern areas. The recent evolution of mobility could suggest that the large divide between the North and South is closing. However, this is not entirely the case, as differences in mobility by geographical area continued to remain and in some cases even increased. In fact, this analysis allows us to show how population loss from the South of Italy has actually risen. This study aims to focus on the evolution of the phenomenon in individual geographical areas and the varying levels of migration between the different genders and age classes. While we are clearly not facing a new boom in out-migration from the South, it is true that out-migration is continuing and represents a serious loss of human capital in this area.

scholarly journals Seasonal phytoplankton dynamics in the coastal waters of the north-eastern Adriatic Sea

2013 ◽  
Vol 77 ◽  
pp. 32-44 ◽  
Author(s):  
Jelena Godrijan ◽  
Daniela Marić ◽  
Igor Tomažić ◽  
Robert Precali ◽  
Martin Pfannkuchen
Keyword(s):  
Coastal Waters ◽  
Adriatic Sea ◽  
Phytoplankton Dynamics ◽  
The North ◽  
North Eastern

scholarly journals New data on the distribution of Parnopes grandior (Pallas, 1771) (Hymenoptera: Chrysididae) in northern Poland: habitat conditions propitious to this rare cuckoo-wasp species

2018 ◽  
Vol 87 (1) ◽  
pp. 57-63 ◽  
Author(s):  
Lucyna Twerd ◽  
Józef Banaszak
Keyword(s):  
Military Training ◽  
Current Data ◽  
Habitat Conditions ◽  
Wasp Species ◽  
Anthropogenic Habitats ◽  
The North ◽  
Northern Poland ◽  
North Eastern ◽  
Year 2000 ◽  
North Eastern Part

Abstract Parnopes grandior is a species that until recently was on the brink of extinction in Poland. Current data, however, indicates that it is expanding north-westwards. Most records of this species come from after the year 2000, primarily in northern Poland, especially in the north-eastern part of the country. Simultaneously, our research has shown that anthropogenic habitats like sand quarries and military training grounds are optimal sites for P. grandior.

Carbonate bioformations around underwater freshwater springs in the north-eastern Adriatic Sea

Facies ◽  
2004 ◽  
Vol 50 (1) ◽  
pp. 13-17 ◽  
Author(s):  
Silvia Cocito ◽  
Maja Novosel ◽  
Andelko Novosel
Keyword(s):  
Adriatic Sea ◽  
The North ◽  
North Eastern ◽  
Freshwater Springs

scholarly journals Holocene ecosystem shifts and human-induced loss of Arca and Ostrea shell beds in the north-eastern Adriatic Sea

2018 ◽  
Vol 126 ◽  
pp. 19-30 ◽  
Author(s):  
Anna-Katharina Mautner ◽  
Ivo Gallmetzer ◽  
Alexandra Haselmair ◽  
Sara-Maria Schnedl ◽  
Adam Tomašových ◽  
...  
Keyword(s):  
Adriatic Sea ◽  
The North ◽  
North Eastern ◽  
Shell Beds
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