scholarly journals Role of predation in controlling bacterial and heterotrophic nanoflagellate standing stocks in the coastal Adriatic Sea: seasonal patterns

1994 ◽  
Vol 114 ◽  
pp. 219-235 ◽  
Author(s):  
M Solid ◽  
N Krstulovic
Keyword(s):  
Adriatic Sea ◽  
Seasonal Patterns ◽  
Heterotrophic Nanoflagellate ◽  
Standing Stocks

Bora wind and heavy persistent precipitation: atmospheric water balance and role of air-sea fluxes over the Adriatic Sea

2017 ◽  
Vol 143 (703) ◽  
pp. 1165-1177 ◽  
Author(s):  
Silvio Davolio ◽  
Riccardo Henin ◽  
Paolo Stocchi ◽  
Andrea Buzzi
Keyword(s):  
Water Balance ◽  
Adriatic Sea ◽  
Atmospheric Water ◽  
Bora Wind

scholarly journals Biogeochemical processes in sediments of the Manfredonia Gulf (Southern Adriatic Sea): early diagenesis of carbon and nutrient and benthic exchange

2004 ◽  
Vol 1 (1) ◽  
pp. 803-823 ◽  
Author(s):  
F. Spagnoli ◽  
G. Bartholini ◽  
M. Marini ◽  
P. Giordano
Keyword(s):  
Adriatic Sea ◽  
Water Interface ◽  
Biogeochemical Processes ◽  
Pore Waters ◽  
Dissolved Nutrients ◽  
Dissolved Iron ◽  
High Sedimentation ◽  
Western Adriatic Current ◽  
A Site

Abstract. In order to understand the mechanisms responsible of the recycle of carbon and nutrients at the sediment-water interface and to understand the role of sediments in nutrients mass balance in coastal water, cores were collected (pore waters and solid phases) and benthic fluxes (oxygen, dissolved nutrients, dissolved iron and managanese, alkalinity and TCO2) were measured in two stations in the Gulf of Manfredonia (Southern Adriatic Sea). Stations were chosen to include a site, in the offshore part of the gulf, under the influence of western Adriatic current and another site, in the inner part of the gulf, under influence of gyres occurring inside the gulf. Both stations were placed in areas characterized by high sedimentation rate. Fluxes at sediment water interface show higher values in S2 site during the summer. Bio-irrigation seems to be the main transport mechanism characterizing both sites, with more evident effects during summer in S1 site.

scholarly journals Linking sardine recruitment in coastal areas to ocean currents using surface drifters and HF radar: a case study in the Gulf of Manfredonia, Adriatic Sea

Ocean Science ◽  
2018 ◽  
Vol 14 (6) ◽  
pp. 1461-1482 ◽  
Author(s):  
Roberta Sciascia ◽  
Maristella Berta ◽  
Daniel F. Carlson ◽  
Annalisa Griffa ◽  
Monica Panfili ◽  
...  
Keyword(s):  
Adriatic Sea ◽  
Strong Dependence ◽  
Early Life History ◽  
Ocean Currents ◽  
Hf Radar ◽  
Residence Times ◽  
Sustainable Resource Management ◽  
Surface Ocean ◽  
Surface Drifters

Abstract. Understanding the role of ocean currents in the recruitment of commercially and ecologically important fish is an important step toward developing sustainable resource management guidelines. To this end, we attempt to elucidate the role of surface ocean transport in supplying recruits of European sardine (Sardina pilchardus) to the Gulf of Manfredonia, a known recruitment area in the Adriatic Sea. Sardine early life history stages (ELHSs) were collected during two cruises to provide observational estimates of their age–size relationship and their passive pelagic larval duration (PPLD). We combine these PPLDs with observations of surface ocean currents to test two hypotheses: (1) ELHSs are transported from remote spawning areas (SAs) by ocean currents to the Gulf of Manfredonia; (2) sardines spawn locally and ELHSs are retained by eddies. A historical surface drifter database is used to test hypothesis 1. Hypothesis 2 is tested by estimating residence times in the Gulf of Manfredonia using surface drifters and virtual particles trajectories that were computed from high-resolution observations of surface currents measured by a high-frequency (HF) radar network. Transport to the Gulf of Manfredonia from remote SAs seems more likely than local spawning and retention given a mismatch between observed PPLDs of 30–50 days and relatively short (<10-day) average residence times. The number and strength of connections between the gulf and remote SAs exhibit a strong dependence on PPLD. For PPLDs of 20 days or less, the gulf is connected to SAs on the western Adriatic coast through transport in the Western Adriatic Current (WAC). SAs on the east coast are more important at longer PPLDs. SAs in the northern and central Adriatic exhibit weak connections at all PPLD ranges considered. These results agree with otolith microstructure analysis, suggesting that the arrival of larvae in the gulf is characterized by repeated pulses from remote SAs. This is the first attempt to describe the processes related to Lagrangian connection to, and retention in, the Gulf of Manfredonia that will be complemented in the future using validated numerical ocean models and biophysical models.

Newly discovered role of the heterotrophic nanoflagellate Katablepharis japonica, a predator of toxic or harmful dinoflagellates and raphidophytes

Harmful Algae ◽  
2017 ◽  
Vol 68 ◽  
pp. 224-239 ◽  
Author(s):  
Ji Eun Kwon ◽  
Hae Jin Jeong ◽  
So Jin Kim ◽  
Se Hyeon Jang ◽  
Kyung Ha Lee ◽  
...  
Keyword(s):  
Heterotrophic Nanoflagellate

scholarly journals The role of New Zealand endemic lizards in Salmonella transmission in the takahē translocation network

2021 ◽  
Author(s):  
◽  
Shanna Rose
Keyword(s):  
New Zealand ◽  
Sympatric Species ◽  
Soil Samples ◽  
Seasonal Patterns ◽  
Salmonella Infection ◽  
Wildlife Species ◽  
The World ◽  
Wildlife Populations ◽  
Significant Mortality

<p>The dynamics of disease in wildlife populations often involve a complex relationship between physiological, environmental and ecological variables. Defining the pattern of pathogen infection between primary hosts, sympatric species and their environments is crucial in the understanding of potential impacts a pathogen may have on its host species. Very little is known about pathogens of native, New Zealand wildlife. Understanding the role pathogens play in structuring communities is crucial in the conservation of threatened New Zealand wildlife species. Salmonella is an important pathogen of reptiles, birds and mammals, and Salmonellosis has caused significant mortality in wildlife around the world. Recently, Salmonella has been isolated from takahē from a private island in the takahē translocation network. Reptiles have been implicated as asymptomatic carriers and transmitters of Salmonella, and lizards from a private (undisclosed) island have been implicated in the transmission of Salmonella to takahē. To investigate the capacity for lizards to act as a Salmonella reservoir in the takahē translocation network, I examined the distribution, abundance and Salmonella prevalence of lizards within takahē territories on the private island and on Maud Island where takahē also reside. Additionally, I investigated the presence of Salmonella in soil and water samples from takahē territories on the private island, Maud Island and at the Burwood Bush takahē rearing facility. Lizard densities on the private island were estimated to be between 466-6020 lizards/ha, and 118-1528 lizards/ha on Maud Island. Salmonella serovars concurrent with those isolated from takahē were isolated from 2% of lizards, 25% of water and 50% of soil samples on the private island, indicating that lizards and the environment play an important role in transmission and maintenance of Salmonella to takahē. Salmonella was not isolated from lizards or environmental samples on Maud Island or at Burwood Bush, indicating prevalence too low to detect in this study or a Salmonella reservoir unique to the private island. Further investigation of Salmonella sources; serovars and seasonal patterns of Salmonella infection is needed to better inform takahē translocation actions on the private island. Additionally, further examination of Salmonella in lizards and the environment is necessary to assess the risk of Salmonella infection to takahē on Maud Island.</p>

scholarly journals Temporal dynamics of a fish community in the lower portion of a tidal creek, Pando sub-estuarine system, Uruguay

2017 ◽  
Vol 107 (0) ◽  
Author(s):  
Rodrigo Gurdek ◽  
◽  
Alicia Acuña-Plavan
Keyword(s):  
Fish Community ◽  
Tidal Creek ◽  
Temporal Dynamics ◽  
Small Scale ◽  
Seasonal Patterns ◽  
Estuarine System ◽  
Micropogonias Furnieri ◽  
Different Time Scales ◽  
Odontesthes Argentinensis

ABSTRACT Estuaries are highly dynamic ecosystems subjected to variability of their fish communities over different time scales. The nearshore fish community of the lower Pando estuary, a temperate sub-system of the Río de la Plata estuary, was sampled from May 2002 to June 2003. A total of 2,165 fishes, represented by 16 species were caught by seine netting. Captures were dominated by juveniles (>90%), as well as by the sciaenid Micropogonias furnieri (Desmarest, 1823) (82.8%). The fish community showed high seasonal variability, with the greatest diversity and biomass in summer and spring and the highest species richness during summer. Lowest values of all community parameters occurred in winter and autumn, seasons that presented the highest similarity in fish composition. Number of species was correlated with water temperature and salinity. The ichthyofaunal composition showed significant diel differences in summer and spring. Diel changes were observed in the density of M. furnieri and Odontesthes argentinensis (Valenciennes, 1835), occurring mainly during the day, and of Mugil liza Valenciennes, 1836, Parapimelodus valenciennis (Lütken, 1874) and Brevoortia aurea (Spix & Agassiz, 1829), caught mostly during the night. Temporal variability was attributed to environmental fluctuations, life cycle of species as well as to feeding patterns and small-scale displacements. Presented findings in the Pando sub-estuary denote similar juvenile use and seasonal patterns to those found in estuaries. Further studies in the nursery function and juvenile dynamics over the year are recommended in order to better understand the ecological role of sub-estuaries.

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