Ibo Age Organization, with Special Reference to the Cross River and North-Eastern Ibo

1962 ◽  
Vol 92 (2) ◽  
pp. 191 ◽  
Author(s):  
G. I. Jones
Keyword(s):  
Special Reference ◽  
Cross River ◽  
North Eastern ◽  
The Cross

Nest site ecology of the cross river gorilla at the Kagwene Gorilla Sanctuary, Cameroon, with special reference to anthropogenic influence

2010 ◽  
Vol 73 (3) ◽  
pp. 253-261 ◽  
Author(s):  
Ruth A. De Vere ◽  
Ymke Warren ◽  
Aaron Nicholas ◽  
Mary E. Mackenzie ◽  
James P. Higham
Keyword(s):  
Special Reference ◽  
Nest Site ◽  
Anthropogenic Influence ◽  
Cross River ◽  
Cross River Gorilla ◽  
The Cross ◽  
Site Ecology

Ibo Land Tenure

Africa ◽  
1949 ◽  
Vol 19 (4) ◽  
pp. 309-323 ◽  
Author(s):  
G. I. Jones
Keyword(s):  
Social Structure ◽  
Land Tenure ◽  
Cross River ◽  
Culture Area ◽  
The North ◽  
Marginal Group ◽  
Single Culture ◽  
North Eastern ◽  
The Cross ◽  
Opening Paragraph

Opening ParagraphThe Ibo-speaking people of Eastern Nigeria can be regarded as a single culture area which may provisionally be subdivided into five main divisions: Northern or Onitsha, Southern or Owerri, Western or Ika, Eastern or Cross River, and North-eastern or Abakaliki. The first two divisions, whose boundaries correspond very roughly to those of the Administrative Provinces of Onitsha and Owerri, contain the bulk of the population; the Western occupies the Niger riverain region and the forest country beyond, and their culture has been influenced by that of the Edospeaking tribes farther west, and by Benin; the Cross River Ibo are another marginal group whose affinities with the ‘Semi-Bantu’-speaking tribes on the eastern bank of that river have yet to be studied; while the North-eastern Ibo are a specialized group that has developed, in comparative isolation, a culture and a social structure better adapted to the savannah country in which they live. The remarks which follow refer mainly to the Northern, Southern, and Cross River Ibo; the North-eastern Ibo system differs in many important respects; the Western has not been studied. The terms used in defining Ibo social groupings have been explained in Africa, vol. xix, No. 2, p. 151, and in places where this may cause confusion the ‘official’ or alternative term is given in brackets.

Studies on fecundity and spawning of blue crab (Callinectes Amnicola) in Cross River Estuary

2021 ◽  
Vol 36 (1) ◽  
pp. 75-82
Author(s):  
J. Otoyo ◽  
S.M. Ameh ◽  
O.K. Achema
Keyword(s):  
Blue Crab ◽  
Egg Size ◽  
Gonadosomatic Index ◽  
Carapace Width ◽  
River Estuary ◽  
Hepatosomatic Index ◽  
Cross River ◽  
The Cross ◽  
Cross River Estuary ◽  
Egg Diameter

Studies on identification of species, fecundity and development stages of blue crab, (Callinectes amnicola) were investigated at the Cross River Estuary between the months of December, 2018 and May, 2019. The parameters used for the study were gonadosomatic and hepatosomatic indices, egg diameter and counts. All measurements followed standard procedures. Gonadosomatic index was at its peak in December (88.9) and April (83.3). This coincided with the peak in egg size suggesting that spawning occurred twice within the period.The low values of hepatosomatic index around December (1.20) and April (0.45) added to confirm the spawning in these months. The species spawns at a mean egg size of 17.55mm. The dimension of crabs examined were in the following range: carapace length 40.0 to 70.0mm, carapace width, 5.0 to 60mm and body weight 40.0 to 140.0g. The relationship between fecundity and weight of crab was  significant (r = 0.295: p<0.05), indicating positive correlation. Absolute fecundity of the species ranged between 1,375 and 225,132 eggs. The smallest crab with egg had a carapace width of 39.5mm and weight of 46.9g. Spawning at this size seems to be a strategy adopted by the species to cope with exploitation pressure. The result of this study revealed that C. amnicola had a high reproductive potentials. Hence, adequate regulation is required to enhance sustainability of the species in the Cross River Estuary.

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