Search results for " Marine"

Citizen science: uno strumento di successo per monitorare le specie aliene marine. Il caso studio nelle acque della Sicilia (Mediterraneo centrale)

2019

L’introduzione di specie non indigene invasive (IAS, organismi introdotti in aree esterne al loro areale naturale con comportamento invasivo) è considerata una delle maggiori minacce alla biodiversità e al funzionamento degli ecosistemi naturali (Katsanevakis et al. 2014, Vergeś et al. 2016). Una specie non-nativa (NIS) può diventare invasiva e causare perdita di biodiversità e cambiamenti nei servizi ecosistemici (Giakoumi 2014, Vergés et al. 2016). Nel Mediterraneo oggi sono presenti circa 1.000 NIS, delle quali 134 sono macroite (Verlaque et al. 2015, Alós et al. 2016). Per ridurre il rischio di future introduzioni e meglio comprendere il potenziale invasivo e le dinamiche di diffusione …

Spatio-temporal behaviour of the deep chlorophyll maximum in Mediterranean Sea: Development of a stochastic model for picophytoplankton dynamics

2013

In this paper, by using a stochastic reaction-diffusion-taxis model, we analyze the picophytoplankton dynamics in the basin of the Mediterranean Sea, characterized by poorly mixed waters. The model includes intraspecific competition of picophytoplankton for light and nutrients. The multiplicative noise sources present in the model account for random fluctuations of environmental variables. Phytoplankton distributions obtained from the model show a good agreement with experimental data sampled in two different sites of the Sicily Channel. The results could be extended to analyze data collected in different sites of the Mediterranean Sea and to devise predictive models for phytoplankton dynam…

Sea surges at Monaco and Nice: present-day and future variability (1998-2100).

2018

Sea surges arerapid increase of the level of the sea under atmospheric conditions that could lead to coastal submersion havingstrong impacts especially for coastal towns of the French Riviera such as Nice and the principality of Monaco.Interannual variability of the highest surges at Monaco is robustly simulates by a linear regression usingbarometric conditions over [3-10°E]-[40-45°N] as a predictor. According to 15 global circulation models,highest surges at Monaco could stay stationary for two different climate change scenarios (RCP4.5 andRCP8.5).

Vides pH ietekme sūnu sporu dīgšanā un sūnaugu attīstībā

1939

CLASSIFICATION AND TAXONOMY OF MODERN BENTHIC SHELF FORAMINIFERA OF THE CENTRAL MEDITERRANEAN SEA

2014

Past aquatic environments in the Levant inferred from stable isotope compositions of carbonate and phosphate in fish teeth

2019

Here we explore the carbon and oxygen isotope compositions of the co-existing carbonate and phosphate fractions of fish tooth enameloid as a tool to reconstruct past aquatic fish environments and harvesting grounds. The enameloid oxygen isotope compositions of the phosphate fraction (δ18OPO4) vary by as much as ~4‰ for migratory marine fish such as gilthead seabream (Sparus aurata), predominantly reflecting the different saline habitats it occupies during its life cycle. The offset in enameloid Δ18OCO3-PO4 values of modern marine Sparidae and freshwater Cyprinidae from the Southeast Mediterranean region vary between 8.1 and 11.0‰, similar to values reported for modern sharks. The mean δ13C …

Latvijas purvu veģetācijas klasifikācija un dinamika

1998

Rakstu krājumā apkopoti pēdējo gadu Latvijas purvu un ezeru krastu veģetācijas pētījumu rezultāti. Analizēti Teiču purva veidošanās apstākļi pēc putekšņu diagrammām. Publicētas purvu augu sabiedrību sintaksonomijas shēmas un sinoptiskās tabulas.

Combined effects of thermal conditions and food availability on thermal tolerance of the marine bivalve, Perna viridis

2018

Abstract Organisms can mitigate the effects of long term variation in environmental conditions through acclimation, which involves changes in various physiological responses. To elucidate the possible effects of temperature and food concentrations on acclimation capacity, physiological responses of the mussel, Perna viridis, were measured after individuals were held for six weeks under varying temperatures and food availability. Warm-acclimated mussels experiencing higher food levels had significantly greater upper thermal limits than those maintained on lower food levels. In contrast, the upper thermal limits of cold-acclimated mussels were not affected by food levels. For warm-acclimated …

Shipborne measurements of Antarctic submicron organic aerosols: an NMR perspective linking multiple sources and bioregions

2020

Special issue Marine organic matter: from biological production in the ocean toorganic aerosol particles and marine clouds (ACP/OS inter-journalSI).-- 15 pages, 8 figures, 1 table, supplement https://doi.org/10.5194/acp-20-4193-2020

Signals from the deep-sea: Genetic structure, morphometric analysis, and ecological implications of Cyclothone braueri (Pisces, Gonostomatidae) early…

2020

Abstract Cyclothone braueri (Stomiiformes, Gonostomatidae) is a widely distributed fish inhabiting the mesopelagic zone of marine tropical and temperate waters. Constituting one of the largest biomasses of the ocean, C. braueri is a key element in most of the ecological processes occurring in the twilight layer. We focused on the ecological processes linked to early life stages in relation to marine pelagic environmental drivers (temperature, salinity, food availability and geostrophic currents) considering different regions of the Central Mediterranean Sea. A multivariate morphometric analysis was carried out using six parameters with the aim of discerning different larval morphotypes, whi…