Distribution and dynamics of a tropical waterfalls ecosystem
Waterfalls gives the impression of a lifeless zone because researchers have historically focused on the hydrology, ecotourism and geological features. Effective management will require an understanding of changes in species composition and distribution of macro-biota. Monthly samples were taken in w...
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ftdoajarticles:oai:doaj.org/article:125dfde279a9491895f9d80452137693 2023-05-15T15:48:02+02:00 Distribution and dynamics of a tropical waterfalls ecosystem Offem B.O. Ikpi G.U. 2012-05-01T00:00:00Z https://doi.org/10.1051/kmae/2012004 https://doaj.org/article/125dfde279a9491895f9d80452137693 EN eng EDP Sciences http://dx.doi.org/10.1051/kmae/2012004 https://doaj.org/toc/1961-9502 1961-9502 doi:10.1051/kmae/2012004 https://doaj.org/article/125dfde279a9491895f9d80452137693 Knowledge and Management of Aquatic Ecosystems, Vol 0, Iss 404, p 10 (2012) waterfalls macro-invertebrates phytoplankton zooplankton vegetation fish species physic-chemical properties Aquaculture. Fisheries. Angling SH1-691 article 2012 ftdoajarticles https://doi.org/10.1051/kmae/2012004 2022-12-31T11:52:12Z Waterfalls gives the impression of a lifeless zone because researchers have historically focused on the hydrology, ecotourism and geological features. Effective management will require an understanding of changes in species composition and distribution of macro-biota. Monthly samples were taken in wet and dry seasons, over two year period in three regions along the 6817.7 m length of the Agbokum waterfalls. Macro-biota exhibited distinct pattern in respect of seasonal and spatial changes. Trachelomonas volzii, the most abundant phytoplankton species reduced from 686 in the dry season to 143 in the wet, and from 455 downstream to 91, midstream (waterfalls region). Zooplankton species Calanus finmarchicus decreased from 511 during dry season to 36 in the wet and from 334 downstream to 7, midstream. 71.7 percent of the total macro-invertebrates were recorded from downstream reaches while only 6.3 percent were contributed by midstream. Percentage cover of marginal vegetation by Bambusasp, Symphonia and Elaeis guineesis displayed progressive increase from upstream reaching a maximum of 38.5 mean percent cover in the relatively undisturbed downstream. In contrast, Raphia vinifera, Havea brasiliensis, Grewia sp. and Cocos nucifera shrank in size from 34% to 8% at the midstream stretches of the river while only nymphia- rich vegetation becomes more frequent in the middle reaches. The disturbance regimes of the midstream reaches of Agbokum waterfalls combined with its very low faunal and floral diversity has made the environment unstable therefore susceptible to the invasion of disturbance tolerant biota. Article in Journal/Newspaper Calanus finmarchicus Directory of Open Access Journals: DOAJ Articles Knowledge and Management of Aquatic Ecosystems 404 10 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
waterfalls macro-invertebrates phytoplankton zooplankton vegetation fish species physic-chemical properties Aquaculture. Fisheries. Angling SH1-691 |
spellingShingle |
waterfalls macro-invertebrates phytoplankton zooplankton vegetation fish species physic-chemical properties Aquaculture. Fisheries. Angling SH1-691 Offem B.O. Ikpi G.U. Distribution and dynamics of a tropical waterfalls ecosystem |
topic_facet |
waterfalls macro-invertebrates phytoplankton zooplankton vegetation fish species physic-chemical properties Aquaculture. Fisheries. Angling SH1-691 |
description |
Waterfalls gives the impression of a lifeless zone because researchers have historically focused on the hydrology, ecotourism and geological features. Effective management will require an understanding of changes in species composition and distribution of macro-biota. Monthly samples were taken in wet and dry seasons, over two year period in three regions along the 6817.7 m length of the Agbokum waterfalls. Macro-biota exhibited distinct pattern in respect of seasonal and spatial changes. Trachelomonas volzii, the most abundant phytoplankton species reduced from 686 in the dry season to 143 in the wet, and from 455 downstream to 91, midstream (waterfalls region). Zooplankton species Calanus finmarchicus decreased from 511 during dry season to 36 in the wet and from 334 downstream to 7, midstream. 71.7 percent of the total macro-invertebrates were recorded from downstream reaches while only 6.3 percent were contributed by midstream. Percentage cover of marginal vegetation by Bambusasp, Symphonia and Elaeis guineesis displayed progressive increase from upstream reaching a maximum of 38.5 mean percent cover in the relatively undisturbed downstream. In contrast, Raphia vinifera, Havea brasiliensis, Grewia sp. and Cocos nucifera shrank in size from 34% to 8% at the midstream stretches of the river while only nymphia- rich vegetation becomes more frequent in the middle reaches. The disturbance regimes of the midstream reaches of Agbokum waterfalls combined with its very low faunal and floral diversity has made the environment unstable therefore susceptible to the invasion of disturbance tolerant biota. |
format |
Article in Journal/Newspaper |
author |
Offem B.O. Ikpi G.U. |
author_facet |
Offem B.O. Ikpi G.U. |
author_sort |
Offem B.O. |
title |
Distribution and dynamics of a tropical waterfalls ecosystem |
title_short |
Distribution and dynamics of a tropical waterfalls ecosystem |
title_full |
Distribution and dynamics of a tropical waterfalls ecosystem |
title_fullStr |
Distribution and dynamics of a tropical waterfalls ecosystem |
title_full_unstemmed |
Distribution and dynamics of a tropical waterfalls ecosystem |
title_sort |
distribution and dynamics of a tropical waterfalls ecosystem |
publisher |
EDP Sciences |
publishDate |
2012 |
url |
https://doi.org/10.1051/kmae/2012004 https://doaj.org/article/125dfde279a9491895f9d80452137693 |
genre |
Calanus finmarchicus |
genre_facet |
Calanus finmarchicus |
op_source |
Knowledge and Management of Aquatic Ecosystems, Vol 0, Iss 404, p 10 (2012) |
op_relation |
http://dx.doi.org/10.1051/kmae/2012004 https://doaj.org/toc/1961-9502 1961-9502 doi:10.1051/kmae/2012004 https://doaj.org/article/125dfde279a9491895f9d80452137693 |
op_doi |
https://doi.org/10.1051/kmae/2012004 |
container_title |
Knowledge and Management of Aquatic Ecosystems |
container_issue |
404 |
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10 |
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