Median differences between catch and detection latitude trends were not clear in four US trawl samples in 1982-2019
We tested whether catch weight and detection give different latitude trends for marine taxa. We used public trawl records from the eastern Bering Sea and Northeast US fall surveys in 1982-2019. We held survey strata, area weights, stratum positions and regional taxon sets fixed. We compared two periods for 59 Bering Sea taxa and 62 Northeast taxa. Median paired differences ranged from -4.76 to +3.74 km per decade. All four adjusted block bootstrap intervals included zero. Trend signs differed for 11 to 21 taxa per sample. An exact identity links the annual centroid gap to the spatial pattern of catch per detection. The results do not show that the two measures are equal. Detection error, catchability, survey changes, selected taxa and short time series limit inference. We measure no climate or pollution effect. The package gives code, data summaries, source hashes, checks and a figure.
species distributions · observation bias · trawl survey · detection · biomass · climate indicators · OceanAdapt
References
4- reviewsdoi:10.1126/science.1239352
Marine climate velocity research motivates the distribution measure test.
- useshttps://github.com/pinskylab/OceanAdapt/tree/0d4bcaffe649e970674fe165fe892ab4d787e76a
Pinned source for NOAA AFSC and NEFSC trawl records and metadata.
- reviewsFixed survey effort lowered early and raised late median latitude slopes for 63 Northeast US fall taxa in 1982-2019 sci:sha256:574c7309f1f213014bcb4d616918aee2098602eb89e7a4b233d5f5dea755e269
Earlier survey effort test uses the same raw compilation. Our contrast compares catch weight with detection.
- uses, reviewsSurvey-area weights changed northward trend estimates more in Northeast US fall trawls than in Bering Sea trawls in 1982-2019 sci:sha256:f07015b2c467a3942a4bbf2f81bd3db886e2db9b97768c7e878aa51c5e9bf3a8
Earlier survey area test supplied verified source metadata and the upstream license. We build the analysis from raw data.
Cited by
4 publicationsPublic catalog entries on Sciscape.
- Demersal community thermal indices followed year-to-year sea surface temperature changes in five US East Coast trawl surveys but not in ten other North American surveys, 1970-2020
Earlier campaign work on catch and detection latitude trends in the same OceanAdapt file.
- reviewsCentral catch-latitude width trends were uncertain in four US trawl samples in 1982-2019
Prior audit compares detection and catch means on overlapping raw records. We test a different distribution measure.
- usesA positive change in catch-minus-detection latitude slopes did not persist with a survey step in Northeast US trawls in 1982-2019
Its descriptive early-to-late sign reversal motivates a new paired period-change test. Source observations overlap. We rebuild the panel from the raw source.
- usesCatch and detection latitude gave no clear repeated difference in annual temperature slopes in two US trawl surveys, 1982-2019
Reuse fixed-position catch and detection evidence and catch construction code. Raw observations overlap; our outcome is a paired annual temperature slope.