Successful Control of the Invasive Shrub Chromolaena odorata in Hluhluwe-iMfolozi Park

Author(s):  
Mariska te Beest ◽  
Owen Howison ◽  
Ruth A. Howison ◽  
L. Alexander Dew ◽  
Mandisa Mgobozi Poswa ◽  
...  
AoB Plants ◽  
2019 ◽  
Vol 11 (3) ◽  
Author(s):  
Zimbini Ndzwanana ◽  
Zivanai Tsvuura ◽  
Alex J Valentine ◽  
María A Pérez-Fernández ◽  
Anathi Magadlela

Abstract Vachellia sieberiana fixes atmospheric nitrogen (N) and distributes it back into ecosystems. We hypothesize that biological nitrogen fixation in this plant species is limited by competition from the invasive shrub, Chromolaena odorata. Competition would therefore result in the legume plant switching its limited nitrogen (N) sources in phosphorus-poor soils in savannah ecosystems when resources have to be shared. This study investigated the different patterns of N use and growth costs by a native and an introduced leguminous shrubby species. We propose that the two species sharing the same environment might result in competition. The competitive effect would induce in the indigenous legume to better utilize atmospheric-derived N modifying plant growth kinetics and plant mineral concentrations. Seedlings of V. sieberiana were cultivated in natural soil inoculum with low levels of phosphorus (mg L−1 ± SE) of 3.67 ± 0.88. The experiments were divided into two treatments where (i) seedlings of V. sieberiana were subjected to competition by cultivating them together with seedlings of C. odorata, and (ii) seedlings of V. sieberiana were cultivated independently. Although V. sieberiana was subjected to competition, the N2-fixing bacteria that occupied the nodules was Mesorhizobium species, similar to plants not subjected to competition. Total plant biomass was similar between treatments although V. sieberiana plants subjected to competition accumulated more below-ground biomass and showed higher carbon construction costs than plants growing individually. Total plant phosphorus and nitrogen decreased in seedlings of V. sieberiana under competition, whereas no differences were observed in percent N derived from the atmosphere (%NDFA) between treatments. The specific nitrogen utilization rate (SNUR) was higher in V. sieberiana plants subjected to competition while specific nitrogen absorption rate (SNAR) showed the opposite response. Vachellia sieberiana is highly adapted to nutrient-poor savannah ecosystems and can withstand competition from invasive shrubs by utilizing both atmospheric and soil nitrogen sources.


Author(s):  
S. Flommersfeld ◽  
J. Slonka ◽  
I. Bieberle ◽  
A. Stockschläder ◽  
B. Kemkes-Matthes ◽  
...  

Author(s):  
Emre Özlüer ◽  
Çagaç Yetis ◽  
Evrim Sayin ◽  
Mücahit Avcil

Gynecological malignancies may present as life-threatening vaginal bleeding. Pelvic packing and Resuscitative Endovascular Balloon Occlusion of the Aorta (REBOA) may be useful along with conventional vaginal packing when in terms of control of the hemorrhage. Emergency physicians should be able to perform these interventions promptly in order to save their patients from exsanguination.


2004 ◽  
pp. 406-412
Author(s):  
Paul Okunieff ◽  
Michael C. Schell ◽  
Russell Ruo ◽  
E. Ronald Hale ◽  
Walter G. O'Dell ◽  
...  

✓ The role of radiosurgery in the treatment of patients with advanced-stage metastatic disease is currently under debate. Previous randomized studies have not consistently supported the use of radiosurgery to treat patients with numbers of brain metastases. In negative-results studies, however, intracranial tumor control was high but extracranial disease progressed; thus, patient survival was not greatly affected, although neurocognitive function was generally maintained until death. Because the future promises improved systemic (extracranial) therapy, the successful control of brain disease is that much more crucial. Thus, for selected patients with multiple metastases to the brain who remain in good neurological condition, aggressive lesion-targeting radiosurgery should be very useful. Although a major limitation to success of this therapy is the lack of control of extracranial disease in most patients, it is clear that well-designed, aggressive treatment substantially decreases the progression of brain metastases and also improves neurocognitive survival. The authors present the management and a methodology for rational treatment of a patient with breast cancer who has harbored 24 brain metastases during a 3-year period.


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