scholarly journals Species composition and spatial distribution of sediment propagule bank in Lake Biwa

2012 ◽  
Vol 38 (1) ◽  
pp. 85-90
Author(s):  
Ayumi IMANISHI ◽  
Kimisato ODA ◽  
Junichi IMANISHI ◽  
Yosihiro NATUHARA ◽  
Yukihiro MORIMOTO
Keyword(s):  
Spatial Distribution ◽  
Species Composition ◽  
Lake Biwa ◽  
Propagule Bank

Spatial distribution and temporal variation ofMicrocystis species composition and microcystin concentration in Lake Biwa

2005 ◽  
Vol 20 (3) ◽  
pp. 270-276 ◽  
Author(s):  
Kazuhiko Ozawa ◽  
Hiroki Fujioka ◽  
Minoru Muranaka ◽  
Atsushi Yokoyama ◽  
Yukimi Katagami ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Species Composition ◽  
Temporal Variation ◽  
Lake Biwa ◽  
Microcystin Concentration

scholarly journals Spatial distribution and species composition of small pelagic fishes in the Gulf of California

2006 ◽  
Author(s):  
Edgar Lanz ◽  
Manuel O. Nevárez Martínez ◽  
Juana López Martínez ◽  
Juan A. Dworak
Keyword(s):  
Spatial Distribution ◽  
Species Composition ◽  
Gulf Of California ◽  
Pelagic Fishes

Some aspects of the ecology of bagrid catfishes in a southern Nigerian river

1991 ◽  
Vol 7 (2) ◽  
pp. 221-232 ◽  
Author(s):  
George Idodo-Umeh ◽  
Reginald Victor
Keyword(s):  
Spatial Distribution ◽  
Species Composition ◽  
Rainy Season ◽  
Major Peak ◽  
Fish Yield ◽  
Southern Nigeria ◽  
Minor Peak ◽  
A Minor ◽  
Principal Species ◽  
Dry And Rainy Seasons

ABSTRACTSome aspects of the ecology of bagrid catfishes in River Ase, southern Nigeria were studied for a period of two years. Nine species of Bagridae were recorded and these accounted for 15.0% of the number and 24.4% of the weight of all fish captured. Chrysichthys nigrodigitatus and Chrysichthys auratus longifilis were the principal species. C. nigrodigitatus was a rainy season species, while C. auratus longifilis was abundant in both dry and rainy seasons. Both species showed a major peak in catches between 0600 and 0900 h. C. nigrodigitatus exhibited a minor peak in catches between 1500 and 2100h, while C. auratus longifilis showed a minor peak between 1500 and 1800h. The spatial distribution of C. nigrodigitatus and C. auratus longifilis populations was heterogeneous. Bagrid fishes were an important component in the fish yield of the study river and its species composition has been compared with those of other Nigerian waters. The distribution and abundance of C. nigrodigitatus and C. auratus longifilis are discussed in detail.

scholarly journals Stand structure indices as tools to support forest management: an application in Trentino forests (Italy)

2013 ◽  
Vol 59 (No. 4) ◽  
pp. 159-168 ◽  
Author(s):  
F. Pastorella ◽  
A. Paletto
Keyword(s):  
Spatial Distribution ◽  
Forest Management ◽  
Species Diversity ◽  
Species Composition ◽  
Tree Species ◽  
Stand Structure ◽  
Composite Index ◽  
Mutual Position ◽  
Tree Species Composition ◽  
North East

Stand structure and species diversity are two useful parameters to provide a synthetic measure of forest biodiversity. The stand structure is spatial distribution, mutual position, diameter and height differentiation of trees in a forest ecosystem and it highly influences habitat and species diversity. The forest stand and species diversity can be measured through indices that provide important information to better address silvicultural practices and forest management strategies in the short and long-term period. These indices can be combined in a composite index in order to evaluate the complex diversity at the stand level. The aim of the paper is to identify and to test a complex index (S-index) allowing to take into account both the tree species composition and the stand structure. S-index was applied in a case study in the north-east of Italy (Trentino province). The results show that the Norway spruce forests in Trentino province are characterized by a medium-low level of complexity (S-index is in a range between 0.14 and 0.46) due to a low tree species composition rather than to the stand structure (diametric differentiation and spatial distribution of trees).  

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