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Reconstruction of historical pollination rates reveals linked declines of pollinators and plants

Widespread reports of low pollination rates suggest a recent anthropogenic decline in pollination that could threaten natural and agricultural ecosystems. Nevertheless, unequivocal evidence for a decline in pollination over time has remained elusive because it was not possible to determine historical pollination rates. Here we demonstrate a widely applicable method for reconstructing historical pollination rates, thus allowing comparison with contemporary rates from the same sites. We focused on the relationship between the oil-collecting bee Rediviva peringueyi (Melittidae) and the guild of oil-secreting orchid species (Coryciinae) that depends on it for pollination. The guild is distributed across the highly transformed and fragmented lowlands of the Cape Region of South Africa.

A decline in pollinator dependent vegetable crop productivity in India indicates pollination limitation

Approximately 70% of the tropical crop species depend on pollinators for optimum yields. The economic value of such pollinated crops to India is $726 million and India is the world’s second largest vegetable producer. This status has been underpinned by large-scale changes in land-use and pesticide dependency. A method that partitions crops into categories depending on their relative pollinator dependence (Index of pollinator dependence, DI) was applied to analysis of vegetable yields for India over 45 years (1963-2008) using FAO data. This has revealed that since 1993, relative yields of crop production has either flattened or declined, while pollinator non dependent crops show no similar decline.

Jeffrey Gibbs: 'The beekeepers in Australia are suffering losses from one end to the other'

The days of empty boxes being filled by swarms are over. Unless your bees are on a Eucalyptus honey flow or in native forests, it seems you are in trouble. The rate of recent use of Neonics is unprecedented in Australia's pesticide history; the growth in use amounts to a complete take over of most of our major crops here. Beekeepers are running away from canola (oilseed rape) for the first time in history, we used to run towards it! I can only see a downward spiral, Australian beekeepers are mostly older and the art of generational beekeeping is almost a myth.

Pesticides in Fresh Potatoes Sold in Farmers’ Markets in Alberta, Canada

Fresh potatoes (228 samples) from 34 farmers’ markets in Alberta were analyzed for 29 pesticides. Residues of three different pesticides were found in the samples tested with chlorpropham being most frequently detected (n = 13) at concentrations ranging from 15 to 7,600 microgram per kilogram. Azoxystrobin (n = 11) and imidacloprid (n = 8) were found at concentrations ranging from 0.6 to 5.1 and 15–31 microgram per kilogram, respectively. All pesticide concentrations were below Canadian maximum residue limits as established for potatoes. No pesticide residues were detected in 23 potato samples obtained from certified organic farmers.

90 percent of the 250,000 flowering species now in existence rely on pollinators

Pollinators are an essential part of a garden; so essential in fact, that 90 percent of the 250,000 flowering species now in existence rely on them according to the University of Georgia. Bees and butterflies make up the largest group of pollinators; however, the interior design of certain types of flowers makes it impossible for bees or butterflies to pollinate. These plants must rely on other types of insects to seek out the nectar they produce and pollinate them in the process.

Massive decline in Himalayan butterfly numbers

The lofty western Himalayas are being slowly robbed of their butterflies, with at least 50% of species showing a massive decline in less than a decade. Studies conducted by the high-altitude zoology field station of the Zoological Survey of India (ZSI) based in Solan, Himachal Pradesh, have recorded a drastic drop in butterfly numbers in the western Himalayas, famous for its biodiversity. “The population of 50% of the 288 species recorded in the western Himalayas, comprising areas of Himachal Pradesh and Jammu and Kashmir, have declined more than half in just 10 years,” Avtar Kaur Sidhu, a scientist with the field station, said.

The biodiversity balancing act: “Therefore never send to know for whom the bell tolls; it tolls for thee”

Britain’s 30 million hedgehogs have been reduced to 1.3 million in the last 50 years. Three quarters of butterfly species are in decline. Britain has lost three of its 24 species of bumblebee in last 70 years. Moths numbers have dropped by a third since 1968. In the last 100 years, around 60 species of moth have become extinct. There are those who say all this angst about biodiversity is nonsense. But such free-marketers are wrong. Scottish Natural Heritage’s list of over 1,000 threatened species is not dominated by nice furry mammals or dramatic birds of prey, but by obscure lichens, algae, fungi, flowering plants, beetles, and more than 300 other insects on which the chaps at the top of the Mikado’s list depend, including us. “Therefore never send to know for whom the bell tolls; it tolls for thee.”

Number of butterflies in Scotland hits all-time low

THE number of butterflies in Scotland hit an all-time low. Butterfly Conservation said the number of individual butterflies recorded was down 11% on the previous year and it warned of long-term decline in some species after the last four years have seen successive population falls. There are 59 species of butterfly, after four became extinct during the last century. The common blue butterfly was the worst affected this year, with its numbers tumbling by 61% in the UK-wide count, although it remains the seventh most common species in Scotland. The small tortoiseshell, which has declined in numbers in the rest of the UK, was the most common butterfly spotted north of the Border and three times as many of the species were recorded per count in Scotland than in England. The red admiral, ringlet and meadow brown are also faring relatively well north of the Border.

List of critically endangered Australian birds swells

A new report on Australian birds has added four more species to the critically endangered list and found that a total of 39 species or sub-species are more threatened now than they were a decade ago. The Action Plan for Australian Birds 2010, compiled by researchers from Charles Darwin University and published today by the CSIRO, is an update on the previous report released in 2000. This 2010 report lists 27 taxa (which means species or sub-species) as Extinct, 20 as Critically Endangered, 60 as Endangered, 68 as Vulnerable and 63 as Near Threatened as at 31 December, 2010. The four taxa that that were added to the Critically Endangered list are the Grey-headed Albatross Thalassarche chrysostoma, the Western Ground Parrot Pezoporus flaviventris, the Regent Honeyeater Xanthomyza phrygia and the Norfolk Island Tasman Parakeet Cyanoramphus cookii.

Lower pollinator numbers herald crisis

New Delhi: Red Pierrot, Common Lime, Plain Tiger, Blue Pansy or the Common Castor may be unfamiliar names to most Indians, although it is likely that most would have seen one or more of the five—the most common butterflies found in India. While it is unlikely that most people would notice their absence, it is almost certain that plants will—butterflies, such as these, help them reproduce. The subcontinent has approximately 1,300 of more than 20,000 butterfly species known, said Kishen Das, a US-based lepidopterist. That’s about 6.5% of the global butterfly diversity. However, the problem is that around 100 of the butterfly species found in India are nearing extinction, according to Surya Prakash, a professor at the department of life sciences at Jawaharlal Nehru University. “Few are aware of the crucial pollination role the butterfly plays, which is second only to the honeybee,” he adds.