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4147475
Natality vs Mortality of Great White Sharks
Descrição
main causes of nataly and mortality in great white sharks
Sem etiquetas
great white sharks
population ecology
natality
mortality
bachillerato internacional
Mapa Mental por
Juan Camilo Moreno
, atualizado more than 1 year ago
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Criado por
Juan Camilo Moreno
quase 9 anos atrás
32
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Resumo de Recurso
Natality vs Mortality of Great White Sharks
Natality
Hard to determine due to the Inaccessibility of the specie
Sexual maturity
Juvenile
Subadult
Adult
Aplacental vivipary
They are not embryophagus
Mating probably occurs between spring- summer
Gestation period unknown
Life time: 70 years in average
Mortality
Shark attacks on humans
GIll netting program (South Africa)
40 km of nets, 1354 sharks catched per year (in average)
39 white sharks
Fishing = overexploitation
Serious decline in shark population seen since 1992
Commercial fishing
Provoked and un provoked attacks
Reputation
Great White Sharks: The Biology of Charcharodon Charcharias
Main objectives of the book
-Improve the reputation of the Sharks
Make Five Expeditions
Tag as Many White Sharks as Possible
Provide a long term assesment of population dynamics
Protect the species
Create Laws that prohibit shark fishing in south california, south australia and south africa and create conservation programs world wide
show a Full detail of the Great white shark Biology
Main results a conclusions from the book
Results
Shak biology and behavior studied
73-94 Sharks tagged
Recorded interactions of humans and sharks, fishing, tagging attacks etc...
successful efort to protect white shark in californian and south african waters
Main conlusions
Fishing mortality was assumed to be constant
Rarity of species
Great white Sharks are an endangerde species, Status: Vulnerable
Myths still preveal
Key organism for ecological balance
Chapters Used ( the Chapters are cientific papers with an unique theme about Great white sharks
Chapter 13: Reproduction in the male White shark ( Pag 131)
Chapter 14: Pregnant white sharks and full-term embryos from japan (Pag 139)
Chapter 15: Observations on a pregnant white shark with a review of reproductive biology (Pag 157)
Chapter 36: First estimates of mortality and population size on the south african coast ( Pag 393)
Chapter 37 : Population Dynamics of white sharks in spencer gulf, South australia (Pag 401)
Chapter 45: More rare than dangerous: a case study of white shark conservation in california (Pag 481)
General Methods from the book and it´s papers
methodology of Clark and Von Schmidt, And Pratt
Lateral or ventral incision
tagging, shark capture, nets
Petersen estimate
Baranov catch equation
population size determined by Petersen estimate
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