TY - JOUR
T1 - Mortality estimates of the intertidal purple snail Plicopurpura pansa in the Baja California Peninsula, Mexico
AU - López-Rocha, Jorge A.
AU - Naegel, Ludwig
PY - 2007/12
Y1 - 2007/12
N2 - The intertidal purple snail Plicopurpura pansa was intensively exploited for "Tyrian Purple," leading to declining populations and prohibition by the Mexican government of commercial exploitation. A probable cause for the decline is the difficulty of the snails to reattach themselves fast enough before being washed away by the high impact waves during high tides after being removed from the rocks to obtain 'ink.' To assess this hypothesis, six experiments were conducted at two rocky beaches in the Baja California Peninsula. Total mortality rates were estimated by a recapture probability model. Mortality rates ranged from 6.34 y-1 to 14.23 y-1 at Playa Cerritos and 5.04 y-1 to 7.79 y-1 at Punta Perico. Male mortality rate values were lower than females. These rates show high vulnerability of purple snail after being removed from rocks. For management and conservation of snail populations, it is not sufficient to handle the snails with care and to "milk" them only periodically. Detachment from the rocks seems to be the main reason for high mortality and should be prohibited.
AB - The intertidal purple snail Plicopurpura pansa was intensively exploited for "Tyrian Purple," leading to declining populations and prohibition by the Mexican government of commercial exploitation. A probable cause for the decline is the difficulty of the snails to reattach themselves fast enough before being washed away by the high impact waves during high tides after being removed from the rocks to obtain 'ink.' To assess this hypothesis, six experiments were conducted at two rocky beaches in the Baja California Peninsula. Total mortality rates were estimated by a recapture probability model. Mortality rates ranged from 6.34 y-1 to 14.23 y-1 at Playa Cerritos and 5.04 y-1 to 7.79 y-1 at Punta Perico. Male mortality rate values were lower than females. These rates show high vulnerability of purple snail after being removed from rocks. For management and conservation of snail populations, it is not sufficient to handle the snails with care and to "milk" them only periodically. Detachment from the rocks seems to be the main reason for high mortality and should be prohibited.
KW - Mortality
KW - Plicopurpura pansa
KW - Purple snail
KW - Tagging
UR - http://www.scopus.com/inward/record.url?scp=38349180493&partnerID=8YFLogxK
U2 - 10.2983/0730-8000(2007)26[1109:MEOTIP]2.0.CO;2
DO - 10.2983/0730-8000(2007)26[1109:MEOTIP]2.0.CO;2
M3 - Artículo
SN - 0730-8000
VL - 26
SP - 1109
EP - 1113
JO - Journal of Shellfish Research
JF - Journal of Shellfish Research
IS - 4
ER -