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Species
Azolla pinnata R. Br.
IUCN
NCBI
EOL Text
Population
Population Trend
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | © International Union for Conservation of Nature and Natural Resources |
Source | http://www.iucnredlist.org/apps/redlist/details/168790 |
Population: There is no information about its global population but sometimes it forms dense mat that can compete with other floating plants. Population Trend: Unknown
License | http://creativecommons.org/licenses/by/3.0/ |
Rights holder/Author | "Molur et al, 2011", IUCN and ZOO 2011, India Biodiversity Portal |
Source | http://indiabiodiversity.org/species/show/226657 |
Major Threats
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | © International Union for Conservation of Nature and Natural Resources |
Source | http://www.iucnredlist.org/apps/redlist/details/168790 |
Small floating ferns, whole plant oblong to deltoid in outline, up to 20 × 15 mm. Rhizome up to 0.2 mm in diameter, horizontal, branched into 3-5 alternate pinnae. Roots single or in fascicles of 2-3 at the branche nodes, up to 3.5 cm long, hairy, with conspicuous root cap. Leaves minute in 2 rows, dark green, 2-lobed; upper lobe up to 1.1 mm long, ovate to broadly elliptic in outline, apex pointed, papillate in the centre and with a hyaline border; lower lobe colourless, more or less equal in size. Plant heterosporous, sporocarps on the submerged lower lobes of the leaves.
Major Threat (s): No major threats have been described.
License | http://creativecommons.org/licenses/by/3.0/ |
Rights holder/Author | "Molur et al, 2011", IUCN and ZOO 2011, India Biodiversity Portal |
Source | http://indiabiodiversity.org/species/show/226657 |
pinnata: with pinnate leaves, refers to the distinctly pinnate arrangements of the branches of the stem.
Conservation Actions
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | © International Union for Conservation of Nature and Natural Resources |
Source | http://www.iucnredlist.org/apps/redlist/details/168790 |
"There are three subordinate taxa of Azolla pinnata depending on the range of occurence. A. pinnata africana is found Africa, A. pinnata asiatica in Asia and A. pinnata pinnata in Oceania."
License | http://creativecommons.org/licenses/by/3.0/ |
Rights holder/Author | "Molur et al, 2011", IUCN and ZOO 2011, India Biodiversity Portal |
Source | http://indiabiodiversity.org/species/show/226657 |
Azolla pinnata is a species of fern known by several common names, including feathered mosquitofern and water velvet. It is native to much of Africa, Asia from China to Japan, India and the Philippines, and parts of Australia. It is an aquatic plant, its frond floating upon the surface of the water. It grows in quiet and slow-moving water bodies, because swift currents and waves break up the plant.[1]
This is a with a triangular frond measuring up to 2.5 centimeters in length which floats on the water. The frond is made up of many rounded or angular overlapping leaves each 1 or 2 millimeters long. They are green, blue-green, or dark red in color and coated in tiny hairs, giving them a velvety appearance.[1] The hairs make the top surface of the leaf water-repellent, keeping the plant afloat even after being pushed under.[1] A water body may be coated in a dense layer of the plants, which form a velvety mat that crowds out other plants.[1] The hairlike roots extend out into the water.[1] The leaves contain the cyanobacterium Anabaena azollae, which is a symbiont that fixes nitrogen from the atmosphere that the fern can use.[1][2] This gives the fern the ability to grow in habitats that are low in nitrogen.[2]
The plant reproduces vegetatively when branches break off the main axis, or sexually when sporocarps on the leaves release spores.[3]
It is present in New Zealand as an introduced species and an invasive weed that has crowded out a native relative, Azolla rubra.[1] It is a pest of waterways because its dense mats reduce oxygen in the water.[4] The weevil Stenopelmus rufinasus is used as an agent of biological pest control to manage Azolla filiculoides, and it has been found to attack A. pinnata as well.[5]
Rice farmers sometimes keep this plant in their paddies because it generates valuable nitrogen via its symbiotic cyanobacteria.[1][3] The plant can be grown in wet soil and then plowed under, generating a good amount of nitrogen-rich fertilizer.[6] The plant has the ability to absorb a certain amount of heavy metal pollution, such as lead, from contaminated water.[7] It is 25-30% protein and can be added to chicken feed.[8][9]
References[edit]
- ^ a b c d e f g h Pacific Island Ecosystems at Risk
- ^ a b Sood, A., et al. (2005). Indicators of phosphorus deficiency in Azolla pinnata (Salviniales, Pteridophyta). Acta Botanica Hungarica 47:1-2 197.
- ^ a b Azolla pinnata. Nonindigenous Aquatic Species. USGS
- ^ Azolla pinnata. Idaho Agriculture.
- ^ Pemberton, R. W. and J. M. Bodle. (2009). Native North American Azolla Weevil, Stenopelmus rufinasus (Coleoptera: Curculionidae), uses the invasive old world Azolla pinnata as a host plant. Florida Entomologist 92:1 153.
- ^ Kaur, H. Biomass production of Azolla pinnata R. Br. in contaminated soils of Punjab (India).
- ^ Jain, S. K. (1990).Azolla pinnata R.Br. and Lemna minor L. for removal of lead and zinc from polluted water. Water Research 24:2 177-83.
- ^ Basak, B., et al. (2002). Azolla (Azolla pinnata) as a feed ingredient in broiler ration. International Journal of Poultry Science 1:1 29.
- ^ Alalade, O. A. and E. A. Iyayi. (2006). Chemical composition and the feeding value of azolla (Azolla pinnata) meal for egg-type chicks. International Journal of Poultry Science 5:2 137.
License | http://creativecommons.org/licenses/by-sa/3.0/ |
Rights holder/Author | Wikipedia |
Source | http://en.wikipedia.org/w/index.php?title=Azolla_pinnata&oldid=628205071 |
"Red List Category & Criteria: Least Concern ver 3.1 Year Assessed: 2010 Assessor/s: Gupta, A.K. Reviewer/s: Juffe Bignoli, D., Khampheng, H. & Zhuang, X. Justification: This aquatic fern is common in tropical regions of the world where it occurs in stagnant water. It can spread rapidly in and around rivers, ditches, and ponds and even in eutrophic waters. Listed as Least Concern as it is a widespread species and faces no major threats. Conservation Actions: No conservation measures are in place or needed."
License | http://creativecommons.org/licenses/by/3.0/ |
Rights holder/Author | "Molur et al, 2011", IUCN and ZOO 2011, India Biodiversity Portal |
Source | http://indiabiodiversity.org/species/show/226657 |