Monthly Archives: May 2007

Cormorant Numbers Declining In Dutch Wetland

In the past few decades the number of Cormorants in the Naardermeer wetland area of northern Holland has declined dramatically. In the 1980’s there were five thousand pairs of birds breeding in the area. Today there are just over 1000 pairs.

Cormorants brood in colonies in the Naardermeer area. They feed in deeper water, such as the Markermeer, which has become too turbulent for the birds to fish and hunt.

According to experts, the mass exodus from the Nardermeer by Cormorants has little impact on the Dutch population as a whole. In other areas the number of breeding pairs has increased, leaving the population of Cormorants in the Netherlands relatively stable.

Cormorants dive up to twenty meters below the water’s surface to search for food. The bird lacks the glossy fat that most diving ducks have, which allows it to dive deep underwater but leaves the birds soaking wet upon returning to the surface. Therefore when they are done feeding, Cormorants need to dry their feathers, which they do by standing with their wings spread-eagle in the sun and wind.

Source: Aalscholvers vertrekken massaal uit het Naardermeer

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New Hummingbird Species Discovered, Endangered

A new species of hummingbird was recently discovered in the Serrania del Pinche mountain range in southwest Colombia. The colorful Gorgeted Puffleg was first seen during surveys of the area done in 2005.

New plant species had recently been discovered in the area so researchers looked for other new species, expecting to find amphibians. The discovery of the bird was unexpected.

Experts believe the range of the Gorgeted Puffleg must be extremely small due to the fact that it had previously been undiscovered by man. The area where the bird was first seen is subject to slash and burn agriculture so environmentalists are scrambling to have the area protected.

Read more about the discovery.

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New Dutch Reserve Area Ready For Breeding Birds

The Dutch environmental group Natuurmonumenten has prepared an area in the Voorsterbos woods of Flevoland as an idea breeding zone for birds. The area, called Zwarte Hoek, or Black Corner, is 28 hectares.

Over the past winter excavating machines released water into the area. Over 26,000 square meters of earth was moved in order to make shallow ponds and streams – ideal feeding grounds for wading birds.

Visitors can view the new area from a bird hide placed on the Zwartemeerdijk.

Source: Zwarte Hoek na aanpassingen optimaal voor weidevogels

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Korean Wetland Drained, Birds Suffer

The Saemangeum Wetland in South Korea was drained last year by the closure of a seawall. The project was intended to create rice paddy fields but the impact of local wildlife has been disastrous.

The water level of the wetland has dropped from seven meters to 17 centimeters. Mud now covers shellfish beds and plants that once thrived in the area and sustained the numerous birds that fed there.

The estuary was an important stopping off point for migratory birds. At least two bird species, the Spoon-billed Sandpiper and Nordmann’s Greenshank, face extinction because of the destruction of this wetland.

Birds Korea has appealed to the UK and EU for help in restoring, conserving and maintaining Saemangeum.

Read more about the dying wetland.

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Dutch Hatchlings Too Late For Caterpillars

The butterfly season in the Netherlands began about three weeks earlier than normal due to record high spring temperatures. Migratory birds that breed in the Netherlands will hatch their chicks too late to feed on caterpillars, and may suffer from lack of suitable food.

Information about the butterfly situation was published by a group from the Wageningen University that prepares a Nature Calendar each year. The calendar is used to report the progress of certain species.

Migratory birds like wheatears, cuckoos and swallows rely on abundant supplies of caterpillars each spring to feed their young. Most baby birds will hatch too late this year, after the caterpillars have already become butterflies.

Source: Jonge vogels missen rupsen

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Giant Roost In Senegal: 45,000 Raptors

One of the largest known bird of prey roosts was discovered by French BirdLife researchers in Senegal in January. The roost is thought to contain over 28,000 Lesser Kestrels and over 16,000 African Swallow-tailed Kites.

It is not unusual for raptors to roost communally during the non-breeding season, but the discovery of this ‘super-roost’ is remarkable because of the large number of individual birds. The roost may contain birds that breed in Morocco, Spain, Portugal and France.

Read more about the ‘super-roost’.

Lesser Kestrel (Falco naumanni)
Lesser Kestrel (Falco naumanni) by Lip Kee, Creative Commons on Flickr

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