Suriname, 13th day, savanna


This video from Colombia is about brown-throated parakeets; a species which occurs also in Suriname, including Hannoversavanne.

15 February, from Paramaribo to the south, to the Hannoversavanne. This is a drier part of Suriname than elsewhere, with much grassland instead of forests.

The first birds we see there are crested oropendola, yellow-headed caracara, and tropical kingbird.

A rusty-margined flycatcher.

A solitary sandpiper flying overhead.

A grey-breasted martin.

A white-eyed parakeet.

A chestnut-fronted macaw.

A tropical kingbird chasing away a yellow-headed caracara.

A ringed kingfisher. There has been sand quarrying here in the past. It has stopped now, leaving many ponds.

A southern rough-winged swallow on a pole near a pond. A blue-grey tanager.

A paradise jackamar.

Golden-winged parakeets.

A male pompadour cotinga on a distant tree.

Footprints of a crab-eating raccoon in the wet sandy path.

A tropical mockingbird. A red-billed toucan.

More footprints, this time tailprints as well: of a green iguana.

A little frog in a puddle.

Together on a shrub, swallow-winged puffbird, yellow-bellied elaenia, and brown-throated parakeet.

A brown-crested flycatcher joins a grey kingbird on another shrub.

Then, a special bird. A fork-tailed flycatcher, on a shrub not far away. This winter migrant prefers open space to rainforests. So, this is one of few places in Suriname where one may see it.

At Zanderij airport, we search for another North American migrant, the eastern meadowlark. Sometimes, a few wintering ones can be seen here. Sometimes they cannot be seen. Today they cannot.

Dynamics of the Leaf-Litter Arthropod Fauna Following Fire in a Neotropical Woodland Savanna: here.

January 2011. The rich grasslands in South America, home to one of the world’s most valuable ecosystems is fast disappearing and migratory grassland birds, which play an important role by dispersing seeds and controlling insects, are also rapidly declining in Argentina, Bolivia, Brazil, Paraguay and Uruguay: here.

2 thoughts on “Suriname, 13th day, savanna

  1. How interfering humans helped Amazon diversity

    * 08:00 13 April 2010 by Anil Ananthaswamy

    Don’t tell Sting, but human activity may not be all bad news for the Amazon. A study of South American savannahs suggests that even before Europeans arrived, farmers were changing ecosystems with a landscaping method previously unrecognised in the region. What’s more, the pre-Columbian alterations may have increased biodiversity.

    “Human actions cannot always be characterised as bad for biodiversity,” says Doyle McKey of the University of Montpellier 2, France. “Some might be good.”

    McKey and his colleagues came to their conclusion after studying some strange features of the savannahs of French Guiana. These plains are flooded during the rainy season, dry and parched in the summer, and often burned by fires. It was while walking through this landscape that McKey started wondering about undulations in the terrain.

    It turned out that they are mounds, mostly about 1.5 metres across and 30 centimetres high. McKey thinks that pre-Columbian farmers made them as beds for crops that drained well in the rainy season. Sure enough, when the team tested the mounds’ drainage capacity, they found it was nine times as high as the seasonally flooded savannah.

    New tenants

    Once these fields were abandoned between 800 and 400 years ago, plants and animals colonised the mounds, creating a new ecosystem. Specifically, McKey’s team found that the leaf-cutter ant Acromyrmex octospinosus, the predatory ant Ectatomma brunneum and the Nasutitermitinae subfamily of termites preferred to build their nests on the raised beds.

    The Acromyrmex, which are fungus-growing ants, even transported large quantities of organic matter to their nest. This in turn has caused the plants on the mounds to grow bigger and their roots deeper. The consequent structural integrity of the mounds and their excellent permeability to water has protected them from erosion by flood waters.

    McKey expects that the alterations have been beneficial for the biodiversity of the area. “It’s clear that a savannah with this heterogeneity will have a higher biodiversity than just a flat savannah,” he says.

    Besides French Guiana, such mounds can be found in Surinam, Belize, Venezuela, Ecuador, Bolivia and Mexico. The new study is bound to further fuel the debate over whether most of the Amazon rainforest and the associated savannahs are pristine ecosystems. “To my mind, the debate has been too black-and-white,” says McKey. “Nature and culture are interacting to produce interesting things, and maybe that the way this debate should go.”

    Journal reference: Proceedings of the National Academy of Sciences, DOI: 10.1073/pnas.0908925107

    http://www.newscientist.com/article/dn18762-how-interfering-humans-helped-amazon-diversity.html

    Like

  2. Pingback: Bigi Poika American Indian village | Dear Kitty. Some blog

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.