Three decades after the first reports of the arrival in Botswana of Salvinia molestaa free-floating, mat-forming water fern native to Brazil scientists from the southern African country's Department of Water Affairs say they are at last prevailing in the struggle against a weed that has come to close to threatening the entire Okavango, Africa's largest wetlands that is a UNESCO World Heritage site and home to some of the world's most endangered species.
A research article by Dr. C. N. Kurugundla and others, published recently in The Open Plant Science Journal, describes how teams of scientists and laborers from the Department of Water Affairs undertook the decades-long challenge to combat invasive weeds in the Okavango Delta and also the wetlands off the Kwando-Linyanti-Chobe River and the Limpopo River that borders South Africa and Zimbabwe. “Continuous monthly surveys and monitoring of rivers, lagoons and other wetlands resulted in success and shall serve as inspiration in aquatic weeds management,” Bentham Science Publishing (publisher of the journal) said in a news statement.
The review presents success stories of control of salvinia, Salvinia molesta, by its biocontrol weevil, Cyrtobagous salviniae. (Photo above courtesy of Dr. C. N. Kurugundla)
No fresh releases of the weevil were undertaken after mass releases in 1999 and 2000, which established the insect within three years of their introduction, the authors say.
The review also presents the successful eradication of water lettuce, Pistia stratiotes, in the transboundary Kwando River wetlands by 2005. Management of the growth of water hyacinth, Eichhornia crassipes, from 2012 in the transboundary Limpopo River jointly with neighboring South Africa is also discussed.
The researchers also looks at legislation regarding aquatic weeds. The Government of Botswana “regulates the movement and importation of boats and aquatic apparatus to prevent the importation and spread of aquatic weeds” by the strict implementation of “Aquatic Weed (Control) Act -1986,” the authors say.
“The efforts made by the department have benefited tourism, water resource use, and wildlife. Partly due to the achievement of aquatic weeds control, the tourism sector is now very stable and contributes ca. 25% to the country's GDP,” the news released adds.
“The authors Kurugundla et al. suggest that integrating biological and physical control with public awareness campaigns while working with conservation groups and NGOs would provide sustainable development of wetlands for ecological integrity and livelihoods.”
Reference: Kurugundla. C. N.; et al. (2016). Alien Invasive Aquatic Plant Species in Botswana: Historical Perspective and Management, Open Plant Sci. J., DOI: 10.2174/1874294701609010001
Post prepared from materials provided by Bentham Science Publishing.
Related information: Giant salvinia in the United States and Interagency Giant Salvinia Control Team
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This Labyrinth-esque documentary short, We Are Not Alone, tells the story of the Unarius Academy of Science and its founder Ruth E. Norman—known as “Archangel Uriel” to her students. Norman was an eccentric female leader and self-proclaimed clairvoyant of a spiritual collective in California. She encouraged her students to achieve personal transformation by producing wildly imaginative psychodramas about their past lives. The short film depicts the clear devotion that the Unarians felt towards Norman as they created films on their quest for spiritual healing. These films were shown on public access television in the 1980s, and are now coveted by outsider cinema film collectors.
We Are Not Alone is presented by the female-led media company The Front and directed by filmmaker Jodi Wille. You can find more information about their upcoming projects on their website, Twitter, and Facebook.
Conservationists criticise Andrew Cuomo after he tweets photos of himself next to thresher shark caught during fishing trip
The New York state governor, Andrew Cuomo, and his news anchor brother Chris have been criticised by conservationists and constituents after posing beside a threatened shark they killed on a fishing trip.
The governor tweeted two photos of himself and friends standing next to the bloodied shark as it hung from a marina-side gantry.
Today's catch: A 154.5-lb Thresher shark off the south shore of Long Island. #IFISHNY pic.twitter.com/AsCgEEBxtk
Meanwhile on Long Island, catch of the day goes to Gov Cuomo...with an assist from @chriscuomo pic.twitter.com/9ssErgVtJA
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Parliament at sunset in July
Whakaari, also known as White Island, is an active stratovolcano, situated 48 km (30 mi) from the North Island of New Zealand in the Bay of Plenty. Whakaari is New Zealand's most active volcano, and has been built up by continuous eruptions over the past 150,000 years. The island is approximately 2 km (1.2 mi) in diameter and rises to a height of 321 m (1,053 ft) above sea level.
37°31′S 177°11′E
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The magnitude of food loss is alarming. And yet, the solutions can be relatively simple.
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