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Voeren vogels draagt bij aan significante reductie bladluis


Jorg

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Ik las gisteren een berichtje van forumlid Guyske:

Ik heb sinds een paar dagen een merel die op een paar meter van mij komt zitten, we delen eerlijk de pieren, ik verwacht van hem (het is een zwarte, dus een mannetje zou onze prins zeggen) dat hij ook als eens een rups of ander voor mijn plantjes minder aangenaam beestjes oppeuzel.
Vanochtend kwam ik het volgende bericht tegen in Grow Your Own: Volgens onderstaand wetenschappelijk onderzoek (het eerste emirische materiaal naar dit ondewerp) toont aan dat het bijvoeren van tuinvogels leidt tot een significante vermindering van luizen. Ander onderzoek (universiteit van leeds), op zich is dit niet heel veel nieuws maar wel interessant, toont aan dat de meest effectieve manier om (bestuivende)insecten in de tuin te bevorderen een rommelige tuin is met voldoende schuilplaatsen en voeding.

 

Feeding wild birds shown to reduce insect pests

4 April 2012

The common British past-time of feeding wild birds has been shown to reduce local populations of insect pests, according to research published in Basic and Applied Ecology and funded via a Biotechnology and Biological Sciences Research Council (BBSRC) doctoral training award. The findings are of relevance not only to gardeners but also to agriculture, given that many common avian prey species are important crop pests.

 

Although the direct influence of providing food for wild birds in terms of bird survivorship has been studied, little had been done to understand wider consequences. Researchers from the University of Reading investigated the effects of feeding wild birds on the size and survivorship of colonies of pea aphid (greenfly) - a prey of many small passerine birds. The research was carried out in suburban gardens in Reading.

 

The researchers placed colonies of aphids in gardens with and without bird feeders. To account for amongst garden-variation, half of the colonies were left exposed to bird predation, while others were protected with a wire mesh as controls. After studying the aphid colonies over time, they found that exposed colonies in gardens with feeders had fewer aphids and shorter aphid colony survival times compared with the caged colonies. Gardens without feeders showed no such differences.

 

This is the first experimental evidence that feeding wild birds in domestic gardens can lead to significant reductions in local aphid abundance and colony survivorship.

 

Talking of the significance of her research, Melanie Orros said: "Our results show that by attracting birds into an area with supplementary food, a local increase in the natural prey consumed can be seen. It is an important finding because we increasingly need to consider a variety of sustainable methods and means to control pest populations. This could have important implications in agriculture and in our gardens."

 

Pea aphids were chosen as they represent an important pest but further research would be needed to assess the impact on other species. Miss Orros said: "Pea aphids are a useful start. The level of avian predation on pea aphids was used as a proxy for the potential for biological control on farms in a recent Europe-wide study, for example. However, whereas aphids are seen as pests, many insects are regarded positively because they are pollinators or consume other pests. It would therefore be of interest to test if the depletion effect found here extends to other insects found around bird feeders."

 

http://www.bbsrc.ac.uk/news/food-security/2012/120404-pr-feeding-wild-birds-reduces-pests.aspx

Making a mess can improve your gardening

Research by scientists at the University of Leeds has shown that having a ‘messy’ area in your garden is the most effective way to give bugs a boost and improve pollination in gardens. The University is to exhibit a garden at this year’s RHS Chelsea Flower Show that actively demonstrates how, with clever yet minimal changes to their gardens, everyone can be an “ecosystem services champion”.

 

“If everyone were to make a few, key alterations to their garden, the cumulative difference we would make to the environment could be very significant,” said Dr Rebecca Slack, of the university’s Faculty of Environment. “It doesn’t matter how small your garden is, it can still make a real difference – in fact our garden is deliberately based on the kind of garden you’d usually find in Yorkshire’s urban fringe in order to show just how easy it is to get involved.”

 

The University’s RHS Chelsea exhibit has been designed to resonate with the RHS Environment theme of “urban greening” and has been developed by a team of academics from two faculties at Leeds who are researching ecosystem services. The team includes: Dr Gordon Mitchell and Dr Slack from the Faculty of Environment and Professor Les Firbank and Professor Bill Kunin from the Faculty of Biological Sciences. The team are working with Chelsea gold medal-winning designer Martin Walker who is helping to bring the research to life. Support has also been given by the Natural Environment Research Council (NERC) which has funded much of the research into ecosystem services, including most recently the Insect Pollinators Initiative.

 

The University of Leeds exhibit focuses on three specific areas:

 

Making an area of the garden messy to provide nesting sites, such as “bug hotels” for pollinator insects, and habitat piles for other pollinating invertebrates, and planting pollinator-friendly plants that often thrive in poor soils;

Managing storm water by slowing water flow through the garden and preventing run-off by collecting and storing water to maximise retention within the garden;

Making the garden a carbon sink rather than a source of greenhouse gases by composting to make mulch, reducing use of artificial fertilisers, growing vegetables and fruit, and planting green roofs and walls to insulate buildings.

“Our design is based on an average urban garden,” said Martin Walker, the acclaimed Chelsea gold medal winner. “But we’ve made a few vital tweaks: the path is made of permeable material, so that instead of water running off the surface into drains, it percolates into the soil and stays within the garden. There’s a cottage garden section planted with a mixture of fruit bushes and companion flowering plants: the flowering plants attract pollinators and encourage pollination of the fruit allowing gardeners to grow their own and reduce their carbon footprint.”

 

Dr Slack added: “We’re showing a garden that’s just like any other – it’s the kind of garden you or your friends have – it’s meant to look familiar, rather than different. What we’re showing is the science behind a garden and the many benefits, or services,that a garden ecosystem can provide for the gardener. By focusing on the services of pollination, carbon sequestration and water management, we show that many of the measures gardeners already take are making important contributions to the ecosystem functioning of a garden but is easy to do more.”

 

The University of Leeds is also to launch a “virtual garden” on Facebook where people can grow their own flowers and shrubs and leave gardening tips, effectively making everyone that takes part a member of the University’s online ecosystem.

http://gardenchampions.leeds.ac.uk/latest-news/make-a-mess/

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Mooie info Jorg! Interessant.

Begin er steeds meer 100% van overtuigd te raken dat je weinig last hebt van dingen, als alles maar in evenwicht is met elkaar. Dus inderdaad zoals hier: De natuurlijke vijanden van insecten lekker de kans geven zodat die insecten niet te véél worden.

 

Wij barsten hier vooral van de musjes, een stuk of 25. Die vermaken zich prima omdat ze in veel struiken, bomen en de heg lekker kunnen zitten, in de vijver badderen ze regelmatig.. Ze krijgen van ons water en brood, soms ook aardappels en rijst, en in de winter van die vet-bolletjes.

 

Maar nu ik de artikels hier boven lees, moet ik in ene weer terug denken aan het rupsen probleem. Toen er hier GIGA veel rupsen zaten hadden we standaard 2 a 3 merels. Maar tegenwoordig zijn dit er een stuk of 6 á 7...

 

Wat me trouwens wel opvalt: Vogels hoeven niet persee een gevaar te zijn voor je fruit. Onze rode bessen worden NOOIT maar dan ook NOOIT opgegeten door vogels. Wellicht omdat er overal tussen de struiken een laag van 10 cm blad ligt en we gras hebben: véél wormen!

Dus wie weet is dat nog een grotere reden om blad te laten liggen, naast de compost redenen etc.

 

En wat wij ook nog doen ik het voorjaar.. extra veel kleine takjes en ander klein spul op het gras leggen zodat ze sneller materiaal hebben voor de nestjes

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Zeer interessant artikel Jorg

Doe ik toch iets goeds, de kapjes van t brood én de kruimels die achterblijven in het zakje, gaan de tuin in voor de vogels. In de winter voer ik wel wat vogelvoer bij. Wil aankomend winter wat hangend voer gaan maken.

Hier geen tekort aan vogels, hebben duiven, eksters, merels, en natuurlijk ook veel musjes. En ze vinden het fijn dat hier nog 2 bomen in de tuin staan.

Good things come in small packages

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