Issues and options related to management of Silver Springs rhesus macaques

Management options for the Silver Springs free-ranging rhesus macaque population range from removal to active maintenance of the population in situ. Selection of a management option is dependent upon which issues are perceived to be true problems. Management options are presented along with their effectiveness in dealing with issues previously described.(31 page document)

Documentos Históricos - I. Actos generados por la FCNyM, UNLP.

La historia de las instituciones está construida por una serie de hechos y determinaciones de sus protagonistas. En algunos casos, estos momentos son registrados en documentos dispersos, mientras que una gran mayoría están sumergidos en el tiempo con la amenaza de no poder rescatarlos. Esta situación, entre otras cosas, impide a las generaciones futuras la comprensión del pasado, ya que no cuentan con los elementos básicos para analizar y entender los hechos originados por las mujeres y hombres que conformaron dicha historia. En este documento el Programa para el estudio y uso sustentable de la biota austral (ProBiota) reúne en cinco capítulos una serie de hechos y documentos que son parte del patrimonio histórico de nuestro país. I - Actos realizados en la Facultad de Ciencias Naturales y Museo (FCNyM, UNLP) generados por la División Zoología Vertebrados y el Instituto de Limnología “Dr. Raúl A. Ringuelet”. II - Semblanzas de algunos limnólogos argentinos. III - Reseñas de instituciones y escritos referidos a aspectos históricos de la limnología en nuestro país. IV - Sociedades y eventos relacionados a esta disciplina. V - Obras, documentos y revistas. Los documentos publicados son citados formalmente, mientras que las alocuciones se presentan con su título y el nombre del autor al final. Esta modesta contribución tiene como objetivo ser el inicio de sucesivas recopilaciones que confluyan en un documento exhaustivo y profundo de la rica historia de las ciencias naturales en la Argentina.

STREAM Journal, Vol. 3, No. 2, pp 1-17. April-June 2004

CONTENTS: BFAR moves on in Region 6, by Janice N. Tronco. Livelihoods initiatives in Sapian Bay, by Tee-Jay A. San Diego. Improving access to information through Barangay Learning Resource Centers, by Elizabeth M. Gonzales. The Philippines Fisheries Information System, by Agnes C. Solis. The contributions of planning activities in the participatory process, by Rommel P. Guarin. Inter-LGU alliance building: a key to sustaining the Integrated Fisheries and Aquatic Resource Management Council (IFARMC), by Josephine P. Savaris.

Escapement of the Cape rock lobster (Jasus lalandii ) through the mesh and entrance of commercial traps

Metal-framed traps covered with polyethylene mesh used in the fishery for the South African Cape rock lobster (Jasus lalandii) incidentally capture large numbers of undersize (<75 mm CL) specimens. Air-exposure, handling, and release procedures affect captured rock lobsters and reduce the productivity of the stock, which is heavily fished. Optimally, traps should retain legalsize rock lobsters and allow sublegal animals to escape before traps are hauled. Escapement, based on lobster morphometric measurements, through meshes of 62 mm, 75 mm, and 100 mm was investigated theoretically under controlled conditions in an aquarium, and during field trials. SELECT models were used to model escapement, wherever appropriate. Size-selectivity curves based on the logistic model fitted the aquarium and field data better than asymmetrical Richards curves. The lobster length at 50% retention (L50) on the escapement curve for 100-mm mesh in the aquarium (75.5 mm CL) approximated the minimum legal size (75 mm CL); however estimates of L50 increased to 77.4 mm in field trials where trapentrances were sealed, and to 82.2 mm where trap-entrances were open. Therfore, rock lobsters that cannot escape through the mesh of sealed field traps do so through the trap entrance of open traps. By contrast, the wider selection range and lower L25 of field, compared to aquarium, trials (SR = 8.2 mm vs. 2.6 mm; L25 =73.4 mm vs. 74.1 mm), indicate that small lobsters that should be able to escape from 100-mm mesh traps do not always do so. Escapement from 62-mm mesh traps with open entrance funnels increased by 40−60% over sealed traps. The findings of this study with a known size distribution, are related to those of a recent indirect (comparative) study for the same species, and implications for trap surveys, commercial catch rates, and ghost fishing are discussed.