scholarly journals A Bottom-Up Understanding of Illegal, Unreported, and Unregulated Fishing in Lake Victoria

2016 ◽  
Vol 8 (10) ◽  
pp. 1062 ◽  
Author(s):  
Joseph Luomba ◽  
Ratana Chuenpagdee ◽  
Andrew Song
Keyword(s):  
Lake Victoria ◽  
Bottom Up ◽  
Unregulated Fishing

scholarly journals Guilty as charged: Nile perch was the cause of the haplochromine decline in Lake Victoria

2018 ◽  
Vol 75 (9) ◽  
pp. 1542-1559 ◽  
Author(s):  
Brian E. Marshall
Keyword(s):  
Lake Victoria ◽  
Food Chains ◽  
Nile Perch ◽  
Top Down ◽  
Selective Predation ◽  
Bottom Up ◽  
Haplochromine Cichlids ◽  
Lates Niloticus ◽  
Climatic Event ◽  
Existing Data

Debate on the contribution of Nile perch (Lates niloticus) to the demise of Lake Victoria’s 500+ endemic haplochromine cichlids centers around the “top-down” and “bottom-up” hypotheses. The former suggests Nile perch destroyed the haplochromines, causing the disruption of food chains and nutrient cycling and so initiating the accelerated eutrophication of the lake. The latter proposes that haplochromines suppressed Nile perch by preying on its eggs and fry or competing with juveniles for food. A recent paper argued that accelerated eutrophication caused by a climatic event led to their collapse, allowing Nile perch to explode. However, the Nile perch population grew before haplochromines decreased, and they only collapsed once Nile perch biomass exceeded theirs. The chronology indicates that accelerated eutrophication of the lake followed rather than preceded the haplochromine collapse, suggesting that eutrophication was not its cause. A size-selective predation model developed to support the bottom-up hypothesis is discussed in light of existing data, but does not support the bottom-up hypothesis. It was concluded that the top-down model better fits the data and conforms to the law of parsimony.

Top-Down and Bottom-Up Approaches in the Management of the Laurentian Great Lakes and Lake Victoria Fisheries

Great Lakes ◽  
2012 ◽  
pp. 364-389 ◽  
Author(s):  
Marc Gaden ◽  
Oliva Mkumbo ◽  
Ted Lawrence ◽  
Chris Goddard
Keyword(s):  
Great Lakes ◽  
Lake Victoria ◽  
Laurentian Great Lakes ◽  
Top Down ◽  
Bottom Up

scholarly journals Different property rights regimes in the Lake Victoria multiple species fishery

2005 ◽  
Vol 10 (1) ◽  
pp. 53-65 ◽  
Author(s):  
GARDNER BROWN ◽  
BRETT BERGER ◽  
MOSES IKIARA
Keyword(s):  
Property Rights ◽  
Lake Victoria ◽  
Optimal Solution ◽  
Free Entry ◽  
Bottom Up ◽  
Predator Prey ◽  
Predator Prey Model ◽  
Prey Model ◽  
Multiple Species

Greater ecosystem complexity is recognized by studying a two species predator–prey model under two property rights regimes: free entry and a system such as individual quotas which execute an economically optimal solution. A bottom-up management experiment is discussed in the context of Lake Victoria fisheries.

Psychology and Culture: Top Down Versus Bottom Up?

PsycCRITIQUES ◽  
2005 ◽  
Vol 50 (19) ◽  
Author(s):  
Michael Cole
Keyword(s):  
Top Down ◽  
Bottom Up
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