A roving creel survey with nonuniform probability sampling was conducted on West Point Reservoir, Georgia, for 24 months. The sampling design is described in detail. The assumption that catch per unit effort (CPE) for incompleted fishing trips is an unbiased estimator of CPE for completed trips is tested and verified. Coefficients of variation for monthly estimates of catch and effort are used to measure the precision of the sampling design. Precision was relatively high during the summer (April-October), but decreased markedly during the winter (November-March). This change is largely independent of sample size within the range of 5-10 sample days per month leading to the conclusion that sampling effort could be reduced 50% without impairing the precision of the survey. The method appears capable of detecting changes in the quality of fishing small enough for management purposes. The paper is intended to provide guidelines for the implementation, evaluation, and modification of statistically based creel survey programs. Carlander et al. (1958) reviewed creelcensus methods and stressed the need for a more in-depth approach to sampling techniques as applied to creel surveys. They emphasized that "only when sampling is done according to some statistical scheme can reliability of the data be measured and certain biases be avoided." Robson (1960) presented a detailed creel census procedure for unbiased sampling and estimation of fishing success (weight of fish caught per fisherman hour = catch per unit effort = CPE), total effort, and thus total harvest, using a method of stratified random sampling. Though statistically sound and capable of generating error terms for parameters being estimated, the method was not designed for efficient operation in the field. Lake sections had to be small enough to allow a complete census of fishermen during any given sampling period, thus precluding its use on bodies of water where fishermen are continually on the move, or where many access points are • This study was funded by the U.S. Army Corps of Engineers, Project 1324-23-0953. • The Cooperative Fishery Research Unit is jointly sponsored by the Alabama Department of Conservation and Natural Resources, Auburn University, and the U.S. Fish and Wildlife Service.present. Field personnel were stationary and dependent on the fishermen coming to them rather than actively contacting the fishermen, i.e., manpower was inefficiently utilized.
Growth of the 1977 year class of largemouth bass, Micropterus salmoides, at West Point Reservoir was highly variable. A clearly bimodal length-frequency distribution evident by fall 1977 was not a result of disruption of spawning by temperature or water level fluctuations. The abundance of fish as prey was inadequate for small young-of-the-year largemouth bass after June 1977, but was adequate for the larger, fast-growing largemouth bass of the same year class. This difference in availability of suitable food was apparently instrumental in creating the growth disparity. Fry of gizzard shad, Dorosoma cepedianum, were collected in littoral areas with small largemouth bass but were not important as prey until the largemouth bass were longer than 25 cm. Although bluegills, Lepomis macrochirus, were the most abundant young of the year in littoral areas, they were not selected as food in proportion to their abundance. Differential growth that results in a bimodal or strongly skewed: distribution of young-ofthe-year or yearling largemouth bass, Micropterus salmoides, has been attributed to a combination of a disjunctive spawning period and a shortage of small fish when largemouth bass change from an insect to a fish diet (Parsons 1958; Pasch 1975; Shirley 1975). Spawning became disjunctive when water temperatures fell after initial spawning, and resumed as the temperatures later rose (Kramer and Smith 1960; Summerfelt 1975). It has been suggested that an absence of prey for small largemouth bass may cause differential growth by precluding the change in diet of these fish from insects to fish early in the summer (Aggus and Elliott 1975; Shelton et al. 1979). Each new year class of largemouth bass in West Point Reservoir since its impoundment in • Based on part of a dissertation submitted by T. J.
No abstract
This article focuses on the grammatical properties of a Madurese structure in which an argument of a complement clause appears to occur in a nonthematic position in its dominating clause. Raising-to-object (or its analogue in nonderivational theories) has been proposed over the past thirty years or so for the corresponding construction in the closely related Austronesian languages of Balinese, Indonesian/Malay, and Javanese. Close examination of the Madurese data reveals that a proleptic NP analysis, in which the matrix NP is generated in the matrix clause, proves superior to the raising analysis and shares virtually all of the same properties as the parallel English construction ( I believe about Marlena that she left for Jakarta on Wednesday ). Enumeration of these properties and comparison with both raising and copy raising provide the initial step in identifying the hallmarks of each construction and how they might differ typologically.
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