scholarly journals The interactive effect of herbivory, nutrient enrichment and mucilage on shallow rocky macroalgal communities

Author(s):  
Sarah Caronni ◽  
Chiara Calabretti ◽  
Giulia Ceccherelli ◽  
Sandra Citterio ◽  
Maria Anna Delaria ◽  
...  

In this paper the results of a manipulative experiment aimed to evaluate the interactive short- and long-term effect of three different stressors, herbivory, nutrient and mucilage, on a macroalgal assemblage are presented. The experiment was conducted in Tavolara Punta Coda Cavallo Marine Protected Area during a bloom of the benthic mucilage-producing microalga Chrysophaeum taylorii Lewis and Bryan (Pelagophyceae), recently spreading in the Mediterranean Sea. On a rocky substratum, 18 plots 20x20 cm in size were prepared and, according to different treatments, nutrients were added in some of them to simulate eutrophication, macroalgae were removed to simulate clearings produced by grazers and mucilage was manually removed to simulate mucilage-free conditions. Differences in the composition of macroalgal assemblages were found when considering the short term effect of the considered stressors, and also the response of the most abundant taxa (DFA, ECA, Dictyotales, Laurencia spp. and Padina pavonica) varied among treatments, proving that a combined effect of such stressors on the recovery of macroalgae was present. On the contrary, the effect of treatments was neither highlighted on the most abundant algae nor on the whole structure of the macroalgal assemblage.

2018 ◽  
Author(s):  
Sarah Caronni ◽  
Chiara Calabretti ◽  
Giulia Ceccherelli ◽  
Sandra Citterio ◽  
Maria Anna Delaria ◽  
...  

In this paper the results of a manipulative experiment aimed to evaluate the interactive short- and long-term effect of three different stressors, herbivory, nutrient and mucilage, on a macroalgal assemblage are presented. The experiment was conducted in Tavolara Punta Coda Cavallo Marine Protected Area during a bloom of the benthic mucilage-producing microalga Chrysophaeum taylorii Lewis and Bryan (Pelagophyceae), recently spreading in the Mediterranean Sea. On a rocky substratum, 18 plots 20x20 cm in size were prepared and, according to different treatments, nutrients were added in some of them to simulate eutrophication, macroalgae were removed to simulate clearings produced by grazers and mucilage was manually removed to simulate mucilage-free conditions. Differences in the composition of macroalgal assemblages were found when considering the short term effect of the considered stressors, and also the response of the most abundant taxa (DFA, ECA, Dictyotales, Laurencia spp. and Padina pavonica) varied among treatments, proving that a combined effect of such stressors on the recovery of macroalgae was present. On the contrary, the effect of treatments was neither highlighted on the most abundant algae nor on the whole structure of the macroalgal assemblage.


2003 ◽  
Vol 182 (5) ◽  
pp. 412-419 ◽  
Author(s):  
Peter J. Cooper ◽  
Lynne Murray ◽  
Anji Wilson ◽  
Helena Romaniuk

BackgroundPsychological interventions for postnatal depression can be beneficial in the short term but their longer-term impact is unknown.AimsTo evaluate the long-term effect on maternal mood of three psychological treatments in relation to routine primary care.MethodWomen with post-partum depression (n=193) were assigned randomly to one of four conditions: routine primary care, non-directive counselling, cognitive–behavioural therapy or psychodynamic therapy. They were assessed immediately after the treatment phase (at 4.5 months) and at 9, 18 and 60 months post-partum.ResultsCompared with the control, all three treatments had a significant impact at 4.5 months on maternal mood (Edinburgh Postnatal Depression Scale, EPDS). Only psychodynamic therapy produced a rate of reduction in depression (Structured Clinical Interview for DSM–III–R) significantly superior to that of the control. The benefit of treatment was no longer apparent by 9 months post-partum. Treatment did not reduce subsequent episodes of post-partum depression.ConclusionsPsychological intervention for post-partum depression improves maternal mood (EPDS) in the short term. However, this benefit is not superior to spontaneous remission in the long term.


2006 ◽  
Vol 17 (6) ◽  
pp. 1045-1049 ◽  
Author(s):  
Gi??dre Berretin-Felix ◽  
Renata Paciello Yamashita ◽  
Hugo Nary Filho ◽  
Eduardo Sanches Gonales ◽  
Alceu Sergio Trindade ◽  
...  

Author(s):  
Signe Hulsbæk ◽  
Carsten Juhl ◽  
Alice Røpke ◽  
Thomas Bandholm ◽  
Morten Tange Kristensen

Abstract Background A systematic review and meta-analysis was performed to evaluate the short- and long-term effect of exercise therapy on physical function, independence and wellbeing in older patients following hip fracture, and secondly, whether the effect was modified by trial level characteristics such as intervention modality, duration and initiation timepoint. Methods Medline, CENTRAL, Embase, CINAHL and PEDro was searched up-to November 2020. Eligibility criteria was randomized controlled trials investigating the effect of exercise therapy on physical function, independence and wellbeing in older patients following hip fracture, initiated from time of surgery up-to 1-year. Results Forty-nine studies involving 3905 participants showed a small to moderate effect of exercise therapy at short term (end of intervention) on mobility (Standardized mean difference, SMD 0.49, 95%CI 0.22-0.76); Activities of Daily Living (ADL) (SMD 0.31, 95%CI 0.16-0.46); lower limb muscle strength (SMD 0.36, 95%CI 0.13-0.60); balance (SMD 0.34, 95%CI 0.14-0.54). At long term (closest to 1-year), small to moderate effects were found for mobility (SMD 0.74, 95%CI 0.15-1.34); ADL (SMD 0.42, 95%CI 0.23-0.61); balance (SMD 0.50, 95%CI 0.07-0.94) and Health related Quality of Life (HRQoL) (SMD 0.31, 95%CI 0.03-0.59). Certainty of evidence was evaluated using GRADE ranging from moderate to very low, due to study limitation and inconsistency. Conclusion We found low certainty of evidence for a moderate effect of exercise therapy on mobility in older patients following hip fracture at end-of-treatment and follow-up. Further, low evidence was found for small to moderate short-term effect on ADL, lower limb muscle strength and balance.


1981 ◽  
Vol 4 (5) ◽  
pp. 218-222 ◽  
Author(s):  
M. Berrettini ◽  
U. Buoncristiani ◽  
P. Parise ◽  
E. Ballatori ◽  
G.G. Nenci

The short- and long-term effect of hemodialysis with two different membranes — cuprophan and polyacrilonytrile — on platelet aggregation has been investigated in 12 uremic patients undergoing extracorporeal dialysis, passing from one treatment to the other. Cuprophan membranes failed to correct the defective platelet aggregation of uremia, and their thrombogenicity was documented by a fall in platelet count and further impairment of platelet aggregation during dialysis. On the contrary, polyacrilonitryle membranes showed the capacity to correct completely but transiently the platelet aggregation, without changes in platelet count. The results indicate that polyacrilonytrile membranes show a better biocompatibility toward platelets than cuprophan membranes.


1996 ◽  
Vol 1996 ◽  
pp. 174-174
Author(s):  
A.M. Sibbald

Voluntary food intake is generally inversely related to body condition or fatness in mature sheep (Foot, 1972). Since the intake of pelleted diets by housed sheep consists of a number of discrete feeding bouts or 'meals' (e.g. Bermudez et al., 1989), the relatively long-term effect of body condition on intake will be achieved through changes in feeding behaviour at the level of a single meal. The aim of this experiment was to compare the effects of body condition and short-term food restriction on meal patterns in sheep, to investigate the mechanism by which body condition influences daily food intake.


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