6 research outputs found
The Influence of the Recording Time in Modelling the Swimming Behaviour of the Freshwater Inbenthic Copepod Bryocamptus pygmaeus
The analysis of copepod behaviour gained an increasing impetus over the past decade thanks to the advent of computer-assisted video analysis tools. Since the automated tracking consists in detecting the animal's position frame by frame and improving signals corrupted by strong background noise, a crucial role is played by the length of the video recording. The aim of this study is to: (i) assess whether the recording time influences the analysis of a suite of movement descriptive parameters; (ii) understand if the recording time influences the outcome of the statistical analyses when hypotheses on the effect of toxicants/chemicals on the freshwater invertebrate behaviour are tested. We investigated trajectory parameters commonly used in behavioural studies-swimming speed, percentage of activity and trajectory convex hull-derived from the trajectories described by the inbenthic-interstitial freshwater copepod Bryocamptus pygmaeus exposed to a sub-lethal concentration of diclofenac. The analyses presented in this work indicate that the recording time did not influence the outcome of the results for the swimming speed and the percentage of activity. For the trajectory convex hull area, our results showed that a recording session lasting at least 3 min provided robust results. However, further investigations are needed to disentangle the role of concurrent factors, such as the behavioural analysis of multiple individuals simultaneously, whether they are of the same or opposite sex and the implications on sexual behaviour, competition for resources and predation
Effectiveness of Biomass/Abundance Comparison (ABC) Models in Assessing the Response of Hyporheic Assemblages to Ammonium Contamination
Abundance-Biomass Comparison (ABC) models, first described for marine benthic macrofauna, have been applied successfully to other marine and terrestrial/freshwater fauna but never to ecotonal communities. In particular, to our knowledge, ABC models have not been applied to hyporheic communities. This study represents the first application of ABC models to hyporheic assemblages. We aimed at testing the effectiveness of ABC models in describing the perturbation of hyporheic communities subjected to an existing/known disturbance. To this end, we applied the models to the hyporheic community of an Apennine creek, where the hyporheic waters of the upstream stretch were uncontaminated, whereas those of the downstream stretch were contaminated by ammonium. We also tested separated models for the summer and winter periods to account for potential variability due to season. ABC models provided a satisfactory description of the hyporheic community changes due to ammonium by showing the abundance dominance curve overlying that of the biomass in the downstream stretch contrarily to what was observed in the upstream stretch. However, ABC models did not highlight any significant seasonal effects. Our results showed that ABC models have the potential to be used as assessment tools for ecological quality of hyporheic zones in temperate regions
Hydroids (Cnidaria, Hydrozoa): A Neglected Component of Animal Forests
Hydroids, one of the dominant components of the zoobenthic communities, share comparable growth patterns with higher plants because of their modular body organization, high potential of asexual reproduction, and phenotypic plasticity. These features, together with the ability to enter dormancy to overcome unfavorable conditions, make hydroids successful organisms adaptable to a wide range of environmental scenarios. Depending on their wide range of shapes and sizes, hydroids form three-dimensional forests at different dimensional scales, establishing both trophic and non-trophic relationships with several other organisms, from virus to vertebrates.
Despite numerous researches conducted to study the hydroid ecology, the putative importance of hydroids in structuring zoobenthic communities is underestimated. Here, information available about hydroid ecology is summarized, in order to emphasize the role of hydroids as forest formers, as well as their function in the bentho-pelagic coupling
LâattivitĂ dei Centri Antifumo italiani tra problematiche e aree da potenziare: i risultati di unâindagine svolta attraverso un questionario on-line
Introduzione. In Italia sono 295 i Servizi per la cessazione dal
fumo di tabacco (Centri Antifumo - CA) afferenti al Servizio Sanitario
Nazionale (SSN) censiti nel 2011 dallâOsservatorio Fumo,
Alcol e Droga (OssFAD) dellâIstituto Superiore di SanitĂ . La presente
indagine, condotta dallâOssFAD in collaborazione con i CA,
è stata volta a rilevare alcune delle problematiche con le quali il
personale dei CA si confronta per portare avanti la propria attivitĂ
e le iniziative ritenute utili per migliorarla.
Materiali e metodi. Lâindagine è stata condotta dal 7 al 21
maggio 2012, mediante un questionario compilabile on-line
composto da 5 brevi sezioni di domande con un totale di 38
items da completare. Il link al questionario on-line è stato inviato
per e-mail a 322 indirizzi dei CA censiti nel 2011 dallâOssFAD. I
dati raccolti sono stati elaborati statisticamente con il programma
SPSS 20.
Risultati. Allâindagine hanno risposto 146 operatori dei CA
(45,3%). Sebbene ci siano aspetti ormai consolidati dellâattivitĂ
dei CA, sono ancora molte le criticitĂ che gli operatori riscontrano
nella loro attivitĂ . Le principali problematiche che influiscono
in modo fondamentale/rilevante per la buona attivitĂ
del centro sono le âScarse o nulle risorse economicheâ per il
60,7% del personale, âla mancanza di personale dedicatoâ per
il 52,4% del personale; il âriconoscimento/mandato istituzionale
del CAâ per il 40,9% del personale. Tra le azioni ritenute
piĂš efficaci per facilitare lâaccesso ai CA sono risultate la sensibilizzazione
del personale sanitario (91%), in particolare dei medici
di famiglia e lâinserimento delle prestazioni antitabagiche
nei LEA (76,8%).
Conclusioni. Ă auspicabile che lâattivitĂ dei CA riceva una maggiore
attenzione, attraverso la dotazione di strutture, personale
e finanziamenti adeguati a svolgere un importante ruolo nella
tutela e promozione della salute