Use of radiotelemetry to track threatened dorados Salminus brasiliensis in the upper Uruguay River, Brazil
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
ESR Endangered Species Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials ESR 15:103-114 (2011) - DOI: https://doi.org/10.3354/esr00363 Theme Section: Endangered river fish: threats and conservation options Use of radiotelemetry to track threatened dorados Salminus brasiliensis in the upper Uruguay River, Brazil Lisiane Hahn1,*, Angelo A. Agostinho2, Karl K. English3, Joachim Carosfeld4, Luís Fernando da Câmara1, Steven J. Cooke5 1Neotropical Environmental Consulting Company, Passo Fundo, Rio Grande do Sul, 99074-210 Brazil 2Maringá State University, Maringá, Paraná, 87020-900 Brazil 3LGL Limited − Environmental Research Associates, Sidney, British Columbia V8L 3Y8, Canada 4WFT - World Fisheries Trust, Victoria, British Columbia V9A 3X3, Canada 5Fish Ecology and Conservation Physiology Lab, Carleton University, Ottawa, Ontario K1S 5B6, Canada *Email: lisiane@neotropical.com.br ABSTRACT: Little is known about the seasonal movements of fish that inhabit large rivers in South America, which makes it difficult to identify potential threats to fish populations associated with the proliferation of hydropower developments. Dorados Salminus brasiliensis (Characiformes) are large riverine piscivores that are targeted by recreational and commercial fishers and are considered regionally ‘vulnerable’ in Brazil due to overfishing, pollution, and habitat fragmentation. Here, we used radio telemetry to study the seasonal movements of dorados in the upper Uruguay River, Brazil, to provide the first information on large-scale migratory biology and to inform management and conservation actions. From November 2001 to July 2003, 73 dorados were radio-tracked using aerial surveys and 7 fixed radio telemetry stations installed in a section of the upper Uruguay River covering ~400 km. Despite use of an extensive radio telemetry array and aerial tracking, nearly 40% of fish tagged at the downstream site were never detected, suggesting unreported harvest, post-release mortality, or migration to tributaries or downstream reaches that extended beyond the tracking area, emphasizing the challenges of working in such a large study system in jurisdictions where research capacity and funding are limited. Nonetheless, this study yielded the first data on the migratory biology of dorados and revealed that a segment of the population is quite mobile and thus could be negatively impacted by river fragmentation, suggesting the need for management strategies that maintain connectivity (e.g. fish passage facilities). KEY WORDS: Salminus brasiliensis · Migration · Upper Uruguay River · Radio telemetry · Itá Dam · Turvo Forest Park Full text in pdf format PreviousNextCite this article as: Hahn L, Agostinho AA, English KK, Carosfeld J, da Câmara LF, Cooke SJ (2011) Use of radiotelemetry to track threatened dorados Salminus brasiliensis in the upper Uruguay River, Brazil. Endang Species Res 15:103-114. https://doi.org/10.3354/esr00363 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in ESR Vol. 15, No. 2. Online publication date: November 10, 2011 Print ISSN: 1863-5407; Online ISSN: 1613-4796 Copyright © 2011 Inter-Research.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it