التفاصيل البيبلوغرافية
| العنوان: |
The forgotten need for spatial persistence in catch data from fixed-station surveys. |
| المؤلفون: |
Lee, Laura M.1 laura.lee@ncdenr.gov, Rock, Jason E.2 |
| المصدر: |
Fishery Bulletin. 2018, Vol. 116 Issue 1, p69-74. 8p. |
| مصطلحات موضوعية: |
*FISH populations, *SAMPLING (Process), *ANALYSIS of variance, *TREND analysis, *GEOLOGICAL statistics |
| مستخلص: |
Design-based estimators, which have well known statistical properties, exist for random sampling survey designs and provide unbiased estimates of the mean and variance of summary catch statistics. Although application of these estimators to fixed-station surveys is not technically valid, they can result in unbiased differences between years if the data exhibit spatial persistence A persistent system is one in which the differences in relative abundance of a population that are recorded at fixed stations are consistent from year to year (i.e., there is no interaction between station and years in a 2-way classification). In a fully persistent system, the changes in relative abundance derived from fixed stations will be unbiased. In this study, the persistence in relative abundance data collected from a fixed-station survey intended to monitor juveniles of economically important species is evaluated. The results can be used to infer those species for which changes in relative abundance estimated from fixed-station surveys will be more accurate than changes in relative abundance estimated from random surveys. [ABSTRACT FROM AUTHOR] |
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