Mosquitoes, worst ever

Published in Forum items

Despite the local authorities' attempts to control mosquitoes with pesticides, many have complained that the mosquitoes on the island are more virulent than ever.

 A few examples from communications with Eco Hvar:

"We have been visiting the island on a regular basis for the last ten years and have just returned to England after three weeks in Jelsa.
This has been by far the worst visit in terms of mosquito bites. The incidence seems to be rising year on year. I understand that before our visit the streets were sprayed twice with a strong mixture of poisons in the space of just over a month. Whatever is being done, clearly isn’t working and it is, in fact, having the opposite effect from what is needed." Lynne, UK, e-mail 20th August 2014.

"Some friends who visited Pitve have told me that the mosquitoes were a real problem. Their ten-year-old daughter was so badly bitten on her face that she wanted to go back to Vienna immediately." S., Vienna, e-mail August 2014.

"A young child in our family was so badly bitten by mopsquitoes that we called in the pest control firm to spray our house, but after the spraying the mosquito problem was just as bad!" Verbal communication, Hvar Town, August 2023.

Eco Hvar. There are other, more promising approaches to the mosquito problem:

Some countries are studying the problem with care and choosing ecologically sound solutions. Brazil, which was following on from experiments in Australia, released tens of thousands of mosquitoes infected with a bacterium (called Wolbachiapipientis) which acts as a vaccine against dengue fever in a preventive programme, which started in 2012. The aim was to reduce the number of mosquitoes carrying the dengue fever virus, which in Brazil affected some 3.2 million people, with 800 deaths between 2009 and 2014. The programme in Australia was proven to be effective in reducing the number of disease-carrying mosquitoes.

Another approach, pioneered by British biotechnology firm Oxitec, has been to breed genetically modified mutant male mosquitoes whose offspring die before adulthood, therefore reducing the numbers of disease-carrying mosquitoes. Experimental release of millions of these insects was done in secrecy in various countries, starting on Grand Cayman Island,a nd later in India, Singapore, Thailand, Vietnam and Panama among others. In places where mosquito-borne diseases are not a particular threat, the policy of releasing genetically modified mosquitoes has come under question. In early 2015, plans were under discussion to release millions of genetically modified mosquitoes three times a week in Florida as a preventive measure. There was particular concern about the possible effects if a human should be bitten by one of these mosquitoes, although Oxitec claimed it would do its utmost to release only male mosquitoes, which do not bite humans.

An updated approach to controlling insects has been taken up in Croatia to use against mosquitoes in recent years.. In July 2022, the Croatian National Institute for Health announced a pilot project to introduce sterile male mosquitoes into the environment in the village of Premantura (Medulin Municipality), in association with the Teaching Institute for Public Health (Istria County) and the Biology Department of the J.J.Strossmayer University, Osijek. The concept is known as 'Sterile Insect Technique'. The International Atomic Energy Agency, which helped to finance the project, describes the technique as "an environmentally-friendly insect pest control method involving the mass-rearing and sterilization, using radiation, of a target pest, followed by the systematic area-wide release of the sterile males by air over defined areas, where they mate with wild females resulting in no offspring and a declining pest population." In June 2023, Zagreb announced it was releasing 100,000 sterile mosquitoes into the environment, with an accompanying video showing the release operation. The mosquitoes were released in the Cvjetno naselje, near the River Sava . In Pula, 1,200,000 sterile mosquitoes were to be released over a three-month period. The plan in June 2023 was for Pula to set up its own factory producing sterile mosquitoes, after two years of importing them from Bologna in Italy (report in Croatian).

Still experimental: Although the Sterile Insect Technique has been in use on different targets since the 1950s, the details for targeting each type of insect are not the same. Sterilization of mosquitoes is done by gamma-ray or X-ray irradiation. According to research being done in the United States, the sterilization techniques were still being improved in 2023 (Entomology Today, July 2023; article in the Journal of Medical Entomology, published 21 June 2023).

Personal preventive measures

A strong immune system is vital defence against mosquito-borne diseases as al other infecetions. So a healthy diet, combined with regular exercise and adequate rest are mandatory. One should avoid, or at least minimize debilitating factors such as processed foods and drinks, refined sugar and flour, caffeine and alcohol. Personal hygiene, especially frequent hand washing, is an essential part of infection prevention.

More articles about mosquitoes, how to deal with them - and how not to deal with them:

Mosquitoes: friends and foes?

Poisoning paradise, a wake-up call!

God save our bees!

About the insect suppression programme

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    MARA NORTH CONSERVANCY, Kenya — Under a fading sun, Kenya’s Maasai Mara came alive.

    A land cruiser passed through a wide-open savanna, where a pride of lions stirred from a day-long slumber. Steps away, elephants treaded single-file through tall grass, while giraffes peered from a thicket of acacia trees. But just over a ridge was a sight most safari-goers might not expect — dozens of herders guiding cattle into an enclosure for the night. The herders were swathed in vibrant red blankets carrying long wooden staffs, their beaded jewelry jingling softly.

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    “It's significant income for families that have few other economic opportunities — around US$ 350 a month on average for a family. In Kenya, that's the equivalent of a graduate salary coming out of university,” said Elijah Toirai, Conservation International’s community engagement lead in Africa.

    © Jon McCormack

    Lions tussle in the tall grass of Mara North Conservancy.

    But elsewhere in Africa, the conservancy model has remained far out of reach.

    “Conservancies have the potential to lift pastoral communities out of poverty in many African landscapes. But starting a conservancy requires significant funding — money they simply don't have,” said Bjorn Stauch, senior vice president of Conservation International’s nature finance division.

    Upfront costs can include mapping out land boundaries, removing fences that prevent the movement of wildlife, eradicating invasive species that crowd out native grasses, creating firebreaks to prevent runaway wildfires, as well building infrastructure like roads and drainage ditches that are essential for successful safaris. Once established, conservancies need to develop management plans that guide their specified land use for the future.

    Conservation International wanted to find a way for local communities to start conservancies and strengthen existing ones. Over the next three years, the organization aims to invest millions of dollars in new and emerging conservancies across Southern and East Africa. The funds will be provided as loans, which the conservancies will repay through tourism leases. This financing will jumpstart new conservancies and reinforce those already in place. The approach builds on an initial model that has proven highly effective and popular with local communities.

    “We’re always looking for creative new ways to pay for conservation efforts that last,” Stauch said. “This is really a durable financing mechanism that puts money directly in the pockets of those who live closest to nature — giving them a leg up. And it’s been proven to work in the direst circumstances imaginable.”

    © Will McCarry

    Elijah Toirai explains current conservancy boundaries and potential areas for expansion.

    Creativity from crisis

    In 2020, the entire conservancy model almost collapsed overnight.

    “No one thought that the world could stop in 24 hours,” said Kelvin Alie, senior vice president and acting Africa lead for Conservation International. “But then came the pandemic, and suddenly Kenya is shutting its doors on March 23, 2020. And in the Mara, this steady and very well-rounded model based on safari tourism came to a screeching halt.”

    Tourism operators, who generate the income to pay landowners' leases, found themselves without revenue. Communities faced a difficult choice: replace the lost income by fencing off their lands for grazing, converting it to agriculture, or selling to developers — each of which would have had drastic consequences for the Maasai Mara’s people and wildlife.

    © Will Turner

    A black-backed jackal hunts for prey.

    “But then the nature finance team at Conservation International — these crazy guys — came up with a wild idea,” Alie said. “In just six months they put this entirely new funding model together: loaning money at an affordable rate to the conservancies so that they can continue to pay staff and wildlife rangers.”

    Conservation International and the Maasai Mara Wildlife Conservancies Association launched the African Conservancies Fund — a rescue package to offset lost revenues for approximately 3,000 people in the area who rely on tourism income. Between December 2020 and December 2022, the fund provided more than US$ 2 million in affordable loans to four conservancies managing 70,000 hectares (170,000 acres).

    The loans enabled families in the Maasai Mara to continue receiving income from their lands to pay for health care, home repairs, school fees and more. And because tourism revenues — not government funding — support wildlife protection in conservancies, this replacement funding ensured wildlife patrols continued normally, with rangers working full time.

    Born out of this emergency, we discovered a new way to do conservation.

    Elijah Toirai

    “The catastrophe of COVID-19 was total for us,” said Benard Leperes, a landowner with Mara North Conservancy and a conservation expert at Maasai Mara Wildlife Conservancies Association. “Without Conservation International and the fund, this landscape would have not been secured; the conservancies would have disintegrated as people were forced to sell their land to convert it to agriculture.”

    But it was communities themselves that proved the model might be replicable after the pandemic ended.

    “The conservancies had until 2023 before the first payment was due,” Toirai said. “But as soon as tourism resumed in mid-2021, the communities started paying back the loans. Today, the loans are being repaid way ahead of schedule.”

    “Born out of this emergency, we discovered a new way to do conservation.”

    A new era for conservation

    The high plateaus overlooking the Maasai Mara are home to the very last giant pangolins in Kenya.

    These mammals, armored with distinctive interlocking scales, are highly endangered because of illegal wildlife trade. In Kenya, threats from poaching, deforestation and electric fences meant to deter elephants from crops have caused the species to nearly disappear. Today, scientists believe there could be as few as 30 giant pangolins left in Kenya.

    Conservancies could be crucial to bringing them back. Conservation International has identified opportunities to provide transformative funding for conservancies in this area — a sprawling grassland northwest of Maasai Mara that is the very last pangolin stronghold in the country. The fund will help communities better protect an existing 10,000-hectare (25,000-acre) conservancy and bring an additional 5,000 hectares under protection. It provides a safety net, ensuring a steady income for the communities as the work of expanding the conservancy begins. With a stable income, communities can start work to restore the savanna and remove electric fences that have killed pangolins. And as wildlife move back into the ecosystem, the grasslands will begin to recover.

    In addition to expanding conservancies around Maasai Mara, Conservation International has identified other critical ecosystems where community conservancies can help lift people out poverty, while providing new habitats for wildlife. Conservation International has ambitious plans to restore a critical and highly degraded savanna between Amboseli and Tsavo National Parks in southern Kenya, as well as a swath of savanna outside Kruger National Park in South Africa.

    © Emily Nyrop

    A lone acacia tree in a sea of grass.

    Elephants, fire, Maasai and cattle

    Many of the new and emerging community conservancies have been carefully chosen as key wildlife corridors that would be threatened by overgrazing livestock.

    When the first Maasai Mara conservancies were established in 2009, cattle grazing was prohibited within their boundaries. When poorly managed, cattle can wear grasses down to their roots, triggering topsoil erosion and the loss of nutrients, microbes and biodiversity vital for soil health. It was also believed that tourists would be put off by the sight of livestock mingling with wildlife.

    © Emily Nyrop

    Cattle are closely monitored in the Maasai Mara to prevent overgrazing.

    However, over the years, landowners objected, lamenting the loss of cultural ties to cattle and herding. “That was when we changed tactics,” said Raphael Kereto, the grazing manager for Mara North Conservancy.

    Beginning in 2018, Mara North and other conservancies in the region started adopting livestock grazing practices to restore the savanna. Landowners agreed to periodically move livestock between different pastures, allowing grazed lands to recover and regrow,  mimicking the traditional methods pastoralists have used on these lands for hundreds, if not thousands, of years.

    “Initially, there was a worry that maybe herbivores and other wildlife will run away from cattle,” said Kereto. “But we have seen the exact opposite — the wildlife all follow where cattle are grazing. This is because we have a lot of grass, and all the animals follow where there is a lot of grass. We even saw a cheetah with a cub that spent all her time rotating with wildlife.”

    “It's amazing — when we move cattle, the cheetah comes with it.”

    The loans issued by the fund — now called the African Conservancies Facility — will enhance rotational grazing systems, which are practiced differently in each conservancy, by incorporating best practices and lessons from the organization’s Herding for Health program in southern Africa.

    © Will Turner

    An elephant herd stares down a pack of hyenas.

    For landowners like Dickson Kaelo, who was among the pioneers to propose the conservancy model in Kenya, the return of cattle to the ecosystem has restored a natural order.

    “I always wanted to understand how it was that there was so much more wildlife in the conservancies than in Maasai Mara National Reserve,” said Kaelo, who heads the Kenya Wildlife Conservancy Association, based in Nairobi.

    “I went to the communities and asked them this question. They told me savannas were created by elephants, fire and Maasai and cattle, and excluding any one of those is not good for the health of the system. So, I believe in the conservancies — I know that every single month, people go to the bank and they have some money, they haven't lost their culture because they still are cattle keepers, and the land is much healthier, with more grass, more wildlife, and the trees have not been cut.

    “For me, it’s something really beautiful.”


    Further reading:

    Will McCarry is the content director at Conservation International. Want to read more stories like this? Sign up for email updates. Also, please consider supporting our critical work.