Methods for the Translocation of the Yellow Lampmussel (<em>Lampsilis cariosa</em>) and the Tidewater Mucket (<em>Leptodea ochracea</em>) in the Fort Halifax Dam Impoundment of the Sebasticok River, Maine
Bibliographic record
Abstract
Translocation from areas where habitat alterations are proposed can be an important mussel conservation tool. Pending removal of the Fort Halifax dam on the Sebasticook River in Maine potentially would result in extensive mortality of two statelisted threatened species of mussels, yellow lampmussels (Lampsilis cariosa) and tidewater muckets (Leptodea ochracea), which occur in the impoundment above the dam. My study assessed populations of these two species in the impoundment, and determined the effects of within- and between-waterbody translocations on survival. I conducted a qualitative survey of the Fort Halifax dam impoundment in 2004 to determine locations of these two species and a quantitative survey near the upper end of the impoundment in 2005 where the greatest numbers of these species occur. Estimated densities in survey plots were 0.05-1.1/m2 for yellow lampmussels and 0.0-0.41/m2 for tidewater muckets. In a 2004 pilot study, I translocated a co-occurring common species, eastern lampmussel (Lampsilis radiata radiata), within the impoundment and to two other sites in the watershed, Unity Pond and Sandy Stream. Recapture rates for 2005-2006 were 34- 83% (0-9% mortality). As part of this effort, I used Passive Integrated Transponder (PIT) tags to track translocated mussels to assess the feasibility of this monitoring tool. Numbers of recaptured mussels differed among study sites; however, at all sites I found more tagged mussels with PIT pack searches with visual confirmation (72-80%) than with visual searches alone (30-47%). PIT tags offer improved recapture of translocated mussels and increased accuracy of post-translocation monitoring. I repeated the experiment in 2005 with yellow lampmussels and tidewater muckets. I recaptured 57- 90% of yellow lampmussels (0-7% mortality) and 30-86% of tidewater muckets (4-6% mortality) using PIT pack searches with visual confirmation. In Sandy Stream, sediment is redistributed annually with high late winter-early spring flows, which carry debris and stream-dwelling organisms downstream toward Unity Pond. I found 71% of recaptured eastern lampmussels >100 m from their October 2004 locations, and two yellow lampmussels and four tidewater muckets were 30-100 m downstream from their August 2005 locations. Yellow lampmussels and tidewater muckets in Sandy Stream were also significantly smaller than those found in the Sebasticook River. Although tidewater muckets and yellow lampmussels occur in this stream, the unstable stream bottom and high muskrat predation potentially threaten their survival, making this site unsuitable for translocating mussels from the Sebasticook River. I found greatest densities of yellow lampmussels and tidewater muckets in boulder and cobble substrate in the upper 1.5 km of the impoundment. This area is least likely to be reconfigured following dam removal; the channel should be stable during dewatering and may be a refuge for all mussel species. Mussels in this section could then repopulate the newly formed channel once it stabilizes in the middle of the impoundment. As long as care is taken to protect mussels during dewatering by translocating exposed mussels to the stable channel in the upper end of the impoundment, restoration of lotic habitat throughout the formerly impounded area will benefit yellow lampmussels and tidewater muckets in the long-term.
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.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 0.002 |
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".