Abstract
Context: Improved tracking technologies increase understanding of fish movement, but care is required when comparing studies of different design. Aims: We used an approach that allowed fine-scale tracking to compare results from individual-tracking designs to simulated batch-marking designs. Methods: Adult Galaxias tantangara (a small freshwater fish) individuals were tagged with 9-mm PIT tags in a small headwater stream and tracked with an accuracy of 1 lineal metre. To evaluate differences between common study designs, data were re-analysed to simulate both batch-marking section size and tracking resolution between 1 and 250 m. Key results: Home-range estimates decreased with a smaller section size and tracking resolution. Batch-marking simulations differed in 99% of cases, whereas individual tracking simulations differed in only 17% of comparisons. Comparisons between different methods were rarely statistically equivalent, being so only when section size or resolution was less than 4 m. Implications: Importantly, batch-marking studies are often likely to overestimate home-range size, and results from different studies may be comparable only when resolution is very fine or identical, even if the same method was used.
Original language | English |
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Article number | 22021 |
Pages (from-to) | 1297-1309 |
Number of pages | 13 |
Journal | Marine and Freshwater Research |
Volume | 73 |
Issue number | 11 |
DOIs | |
Publication status | Published - 26 Jul 2022 |