TY - JOUR
T1 - Giant kelp (Macrocystis pyrifera, Phaeophyceae) recruitment near its southern limit in Baja California after mass disappearance during ENSO 1997-1998
AU - Ladah, Lydia B.
AU - Zertuche-González, José A.
AU - Hernandez-Carmona, Gustavo
PY - 1999/12
Y1 - 1999/12
N2 - During the ENSO event of 1997-1998, density and population structure were evaluated in a Macrocystis pyrifera forest located in Bahia Tortugas, Baja California, Mexico, near the southern limit of the species' distribution in the Northern Hemisphere. Observations in Bahia Tortugas were made quarterly from January 1997 to September 1998 using SCUBA diving surveys. No macroscopic plants were found in the Bahia Tortugas area from October 1997 to April 1998, a local absence of at least 7 months. Aerial surveys further suggest regional disappearance along most of the Baja California coast during the event. Unexpectedly, plants were found in Bahia Tortugas again in July 1998, in spite of the widespread disappearance of the species less than a year earlier. Long-distance spore dispersal was an unlikely cause of the recruitment because: 1) the nearest spore source was more than 100 km away; 2) recruitment appeared to be simultaneous at many sites and occurred rapidly after the cessation of the ENSO event; and 3) the recruits occurred in the same areas as before disappearance. We suggest that a microscopic stage that was not visible during dive surveys survived the stressful conditions of ENSO and caused the recruitment event, supporting the hypothesis that a bank of microscopic forms can survive conditions stressful to macroscopic algae.
AB - During the ENSO event of 1997-1998, density and population structure were evaluated in a Macrocystis pyrifera forest located in Bahia Tortugas, Baja California, Mexico, near the southern limit of the species' distribution in the Northern Hemisphere. Observations in Bahia Tortugas were made quarterly from January 1997 to September 1998 using SCUBA diving surveys. No macroscopic plants were found in the Bahia Tortugas area from October 1997 to April 1998, a local absence of at least 7 months. Aerial surveys further suggest regional disappearance along most of the Baja California coast during the event. Unexpectedly, plants were found in Bahia Tortugas again in July 1998, in spite of the widespread disappearance of the species less than a year earlier. Long-distance spore dispersal was an unlikely cause of the recruitment because: 1) the nearest spore source was more than 100 km away; 2) recruitment appeared to be simultaneous at many sites and occurred rapidly after the cessation of the ENSO event; and 3) the recruits occurred in the same areas as before disappearance. We suggest that a microscopic stage that was not visible during dive surveys survived the stressful conditions of ENSO and caused the recruitment event, supporting the hypothesis that a bank of microscopic forms can survive conditions stressful to macroscopic algae.
KW - Baja California
KW - Disturbance
KW - ENSO
KW - El Nino
KW - Extinction
KW - Giant kelp
KW - Macrocystis pyrifera
KW - Mexico
KW - Microscopic stages
KW - Population dynamics
UR - http://www.scopus.com/inward/record.url?scp=0033400815&partnerID=8YFLogxK
U2 - 10.1046/j.1529-8817.1999.3561106.x
DO - 10.1046/j.1529-8817.1999.3561106.x
M3 - Artículo
SN - 0022-3646
VL - 35
SP - 1106
EP - 1112
JO - Journal of Phycology
JF - Journal of Phycology
IS - 6
ER -