caa a22 4500 445820160 CHVBK 20180317145241.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s00338-011-0738-2 doi (NATIONALLICENCE)springer-10.1007/s00338-011-0738-2 Dangerous demographics: the lack of juvenile humphead parrotfishes Bolbometopon muricatum on the Great Barrier Reef [Elektronische Daten] [D. Bellwood, J. Choat] The humphead parrotfish, Bolbometopon muricatum, the largest of all parrotfish species, is heavily fished throughout most of its range. In remote and heavily protected locations, such as the Great Barrier Reef (GBR), it is a major component of parrotfish biomass and plays a critical role in ecosystem processes. However, extensive surveys of GBR populations have revealed a striking lack of juveniles. Of 633 individuals censused, just four were juveniles. This represents 0.6% juveniles and contrasts markedly with the 20.2-40.2% juveniles recorded in eight other medium to large parrotfish species. These low values in Bolbometopon are corroborated by over 5,000h of independent observations and extensive museum collections. Whilst there is no evidence to suggest that this is an extraordinary new condition for GBR Bolbometopon, it may nevertheless expose them to special risks in a changing and unpredictable world. Despite excellent management on the GBR, Bolbometopon populations may be more vulnerable than previously thought. Springer-Verlag, 2011 Bolbometopon nationallicence Demographics nationallicence Coral reefs nationallicence Fishing pressure nationallicence Population structure nationallicence Labridae nationallicence Bellwood D. School of Marine and Tropical Biology, James Cook University, 4811, Townsville, QLD, Australia aut Choat J. School of Marine and Tropical Biology, James Cook University, 4811, Townsville, QLD, Australia aut Coral Reefs Springer-Verlag 30/2(2011-06-01), 549-554 0722-4028 30:2<549 2011 30 338 https://doi.org/10.1007/s00338-011-0738-2 text/html Onlinezugriff via DOI 1 brief-communication jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00338-011-0738-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bellwood D. School of Marine and Tropical Biology, James Cook University, 4811, Townsville, QLD, Australia aut NATIONALLICENCE 700 1- Choat J. School of Marine and Tropical Biology, James Cook University, 4811, Townsville, QLD, Australia aut NATIONALLICENCE 773 0- Coral Reefs Springer-Verlag 30/2(2011-06-01), 549-554 0722-4028 30:2<549 2011 30 338 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer