Testing the Enemy Release Hypothesis on tall-statured grasses in South Africa, using Arundo donax, Phragmites australis, and Phragmites mauritianus as models.

The Enemy Release Hypothesis (ERH) predicts that introduced plant species can escape herbivory and therefore have a competitive advantage over native plants, which are exposed to both generalist and specialist natural enemies. In this study, the ERH was explored using the invasive alien species, Arundo donax and two native tall-statured grasses, the cosmopolitan Phragmites australis and African endemic Phragmites mauritianus in South Africa. It was predicted that A. donax would have reduced species richness of herbivores compared with the native Phragmites spp., that it would be devoid of specialist herbivores and would thus be experiencing enemy escape in the adventive range. The herbivore assemblages were determined from both field surveys and a literature review. The assumptions of the ERH were for the most part not met; 13 herbivores were found on A. donax compared with 17 on P. australis and 20 on P. mauritianus. Arundo donax had two specialist herbivores from its native range, and shared native herbivores with Phragmites spp. Although A. donax had reduced species richness and diversity compared with that found in the native distribution, it has partially re-acquired a herbivore assemblage which is similar to that found on analogous native species. This suggests that enemy release may not fully explain the invasive success of A. donax in South Africa.

Initial consecutive 125 cases of robotic assisted laparoscopic radical prostatectomy performed in Ireland's first robotic radical prostatectomy centre.

BACKGROUND: We examined the patient characteristics, operative proceedings and the outcomes of the initial series of 125 cases of robot-assisted laparoscopic radical prostatectomy (RALRP) in an independent hospital in Ireland, performed by two surgeons using the da Vinci(®) surgical system. MATERIALS AND METHODS: The series data were gathered prospectively in a consecutive series. Focus was given to the outcome trifecta of oncological control, urinary continence and erectile function. We also report on complications reported using the Clavien-Dindo classification. RESULTS: Mean patient age was 58.86 years, with a range between 47 and 71 years. Positive surgical margin rates were 11.3% overall (n = 14); 7.8% (n = 8) in the pT2 group (n = 101) and 30% (n = 6) in the pT3/pT4 (n = 20) group. 93% (n = 125) of patients are continent at 6 months. Biochemical recurrence-free survival was 92.4%. 72% (n = 43) of patients under the age of 65 with normal preoperative erectile function are potent at 1 year post-operatively. No patient in this series required a blood transfusion. Some form of relatively minor complication occurred in 12.8% (n = 16) of cases; there was no mortality rate, and no complication was life-threatening or resulted in single-organ or multiple-organ failure. CONCLUSIONS: With a combination of high-level fellowship training of surgeons, a co-operative and combined approach to cases between surgeons, institutional support, and enthusiasm, encouragement and dedication from ancillary staff and colleagues, we have shown that a programme can be established with excellent levels of safety and efficacy.