9492 - Laserfiche WebLink

Home Browse Search

zoom lens. Drawings were professionally scanned as TIFF files at resolutions suitable for publication and subsequent reduction, manipulation, and conversion for other print and computer-display purposes. Developmental intervals referenced herein and used as a framework for description and the key (embryonic, proto larval, flexion mesolarval, postflexion meso larval, metalarval, and early juvenile) are also discussed and defined by Snyder and Muth (1990). Common and scientific names follow Robins et a1. (1991). All descriptive data for longnose sucker are summarized in a descriptive species account comparable to those in Snyder and Muth (1990) or an update and expansion of the "Comparative Summary" in that guide. Most of those data are also used and accessible in the computer- interactive key. The illustrations of longnose sucker larvae and early juveniles are presented as part of the species account. Illustrations and much or the tabulated descriptive data in the species account were presented as a poster at the 2002 meeting of Recovery Program Researchers in Moab, Utah, 16-17 January, and American Fisheries Society Colorado-Wyoming Chapter in Laramie, Wyoming, 26-27 February. Corrections and Updates Through the years since publication of Snyder and Muth (1990), mistakes in that guide have been noted by the authors, reviewers, and users; character-range extensions for most described species have been recorded based on atypical specimens examined or processed by LFL or other researchers; and for one species, better drawings for two larval stages have become available. Unfortunately, some records connecting character-range extensions to specific LFL- cataloged or client-maintained specimens have been lost. Appropriate amendments to the affected sections of the guide are listed in results or incorporated, with descriptive data for longnose sucker, in the revised "Comparative Summary" and new "Computer-Interactive Key." New drawings representing recently hatched protolarvae and mid-phase metalarvae of white sucker were prepared for a comparative description of Rio Grande sucker C. plebeius by Snyder (1998). Those drawings are reproduced in results as substitutes for the corresponding illustrations in the 1990 guide. Computer-Interactive Key Most computer-interactive keys are data sets designed to be used with specific commercial, public-domain, or proprietary programs for that purpose. The features and flexibility of several computer-interactive key programs were compared. Based on this comparison and prior experience with the DELTA program Intkey (Dallwitz et a1.1993 onwards, 1995 onwards), Intkey was selected as the host program for the key. The latest versions of that program, DELTA Editor (Dallwitz et a1. 1999 onwards), and associated programs and files were downloaded from the Internet (http://biodiversity.uno.eduldelta/). DELTA Editor was used to develop and refine a progressive series of data sets for UCRB sucker larvae and the derived data files required by Intkey. Rich-text files to be accessed by Intkey were prepared or modified with a word-processor program (Corel WordPerfect or Microsoft Word). Image files used by Intkey were created or modified from scanned files with a computer drawing or presentation program (Microsoft PhotoDraw or PowerPoint). Like the printed keys, a set of preliminary keys prepared prior to this project and each set of early interim versions developed during this project consisted of six keys, one for each developmental period or phase (including a single-character key for embryos based on egg 14