ALAS Light-trap Collections, 2002 Expeditions
Entotech light traps were used to obtain a series of one-night blacklight samples. These traps use a 8 watt blacklight tube surrounded by 3 transparent panes, all perched over a funnel on top of a bucket. The bucket has an internal smaller funnel and screen to allow water drainage from rain. Unlike the La Selva sampling program, the traps were not surrounded by a larger wire cage to exclude large insects. Crumpled paper towels and egg cartons were placed in the bottom of the bucket, and a cloth bag of potassium or sodium cyanide suspended inside. The traps were placed before dusk and harvested the next morning. A light sensor turned the light on at dusk and off at dawn. Traps were placed and harvested by ALAS staff Danilo Brenes, Ronald Vargas, and Maylin Paniagua.
During the first week of the first expedition two sites were chosen, and traps were placed in those two fixed sites each night. The two sites were within 100m of the refuge building. Site 1 was in second growth forest; site 2 was in primary forest. Samples are listed below.
Abundant collecting was also carried out at a mercury vapor lamp. A sheet was tacked to the side of the refuge building, and the lamp suspended in front of the sheet. The lamp was usually operated from nightfall until 9 or 10pm, and collectors hand-picked from the sheet. No quantitative sampling structure was applied to mercury vapor lamp collecting.
The data fields, in order, are:
Collection code: a unique code for a collection. The "20" indicates that it is from the 2000m site (Refugio Vara Blanca), the "L" indicates it is a light-trap sample, the following two numbers are the trap location ("00" for various trial locations, "01" and "02" for the two fixed locations), and the final three-digit number is a serial number beginning with 001 for the first sample, and ending with 070 for the last.
Collection date: day sample was harvested (morning following trap placement), in format day-month-year.
Notes: primarily indicating which nights the blacklight failed to stay lit, due to battery or connection problems.
20/L/01/001 10-Feb-2002 No funciono
20/L/02/006 12-Feb-2002 No funciono
20/L/02/016 17-Feb-2002 No funciono
20/L/01/043 19-Mar-2002 No funciono
20/L/00/047 21-Mar-2002 Noche con mucha lluvia
20/L/00/049 22-Mar-2002 No funciono
Trampa colocada en un claro grande al lado izquierdo de la quebrada
cerca de Refugio saliendo hacia el Barva.