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Water Hyacinth

Water Hyacinth
Photo Information
Copyright: philippe hornus (amanengone) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 188 W: 54 N: 412] (2113)
Genre: Plants
Medium: Color
Date Taken: 2011-03-10
Categories: Water Plants
Camera: Canon PowerShot G12, Sandisk Ultra II 8GB
Exposure: f/4, 1/800 seconds
Photo Version: Original Version
Theme(s): Flowers from intertropical africa [view contributor(s)]
Date Submitted: 2011-06-21 14:59
Viewed: 4331
Points: 2
[Note Guidelines] Photographer's Note [French]
The topic

Eichhornia crassipes (Mart.) Solms, 1883 is a beautiful plant native to the Amazon. Particularly ornamental, it was introduced here and there, without great care, to the delight of our eyes. And one can say that from this point of view, it was a success almost unprecedented.

It is only to look across the beautiful bodies of water covered with this spectacular plant which is perfectly perennial in humid tropical conditions

But ... there is still a problem.

This exuberant plant has become a nuisance of the highest order in a few decades and it is no exaggeration to speak of "Noxious invasive weed", as the USDA.

It is only to sail on the Congo River, or visit water bodies colonized in the Democratic Republic of Congo (and many other countries and places like Lake Chad) to realize it. The navigation is sometimes unpredictable. The banks are colonized and access made ​​difficult. Large bodies of water are suffering from eutrophication. They are doomed to certain death. Crocodiles are proliferating. The natural resources of rivers and lakes are shrinking and disappearing. Equipment and infra structures are damaged.

It was a nice plant and welcome to the embellishments. In recent decades, it turned into ecological disaster.

This suggests that any movement of living things from one place to another should be preceded by environmental impact studies, accurate and documented.

More info in the French page - Translation coming soon

Full size picture

Full size picture here

The shooting

The picture was taken at the end of a sunny morning, in a swamp, in direct sunlight. To achieve it, I went down in the swamp itself, to be at the flower.

Given the lighting conditions and light, I set the minimum sensitivity (ISO-100) and short shutter speed (1 / 800). With a focal length of 6.10 millimeters, the opening is calculated f/4.0.


Cirad Website on the noxious invasive weeds of Guyane, by the Cirad

Invasives weeds, by "l'Internaute"

Noxious invasive weeds according the USDA

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Critiques [Translate]

Wonderful photo with excellent details and very good focus!!!

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