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Thesis Chapter 2 dataset - READ ME.txt

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Thesis Chapter 2 dataset.csv

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Thesis Chapter 4 dataset - Eel length data.csv

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Thesis Chapter 4 dataset - Site level data.csv

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Thesis Chapter 4 dataset - Stream level data.csv

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Thesis Chapter 4 dataset - Trout length data.csv

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Thesis Chapter 4 dataset - READ ME.txt

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Thesis Chapter 5 dataset - READ ME.txt

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Thesis Chapter 5 dataset.csv

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Thesis Chapter 6 dataset - READ ME.txt

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Thesis Chapter 6 dataset.csv

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indexcodes.txt

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indexcodes.txt

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indexcodes.txt

http://eprints.org/relation/isVersionOf https://bordar.bournemouth.ac.uk/id/document/852 http://eprints.org/relation/isVolatileVersionOf https://bordar.bournemouth.ac.uk/id/document/852 http://eprints.org/relation/isIndexCodesVersionOf https://bordar.bournemouth.ac.uk/id/document/852 859 1 3678 document 859 indexcodes.txt text/plain 00f0408f01418a2266a56907f2b587f3 MD5 1323 2022-07-12 12:14:21 https://bordar.bournemouth.ac.uk/241/15/indexcodes.txt 241 15 15 text/plain other Generate index codes conversion from text to indexcodes en public

indexcodes.txt

http://eprints.org/relation/isVersionOf https://bordar.bournemouth.ac.uk/id/document/854 http://eprints.org/relation/isVolatileVersionOf https://bordar.bournemouth.ac.uk/id/document/854 http://eprints.org/relation/isIndexCodesVersionOf https://bordar.bournemouth.ac.uk/id/document/854 archive 5132 disk0/00/00/02/41 2022-08-09 08:57:06 2022-08-09 08:57:45 2022-08-09 08:57:06 data_collection show Cameron Luke lcameron650@gmail.com Naisbett-Jones Lewis lewisnjones@outlook.com unpub facsci salmonid, anguillid, Atlantic salmon, European eel, anadromous, catadromous, translocation, assisted colonisation, electrofishing, electric fishing These datasets were collected as part of experiments to determine the accuracy of a commonly applied population monitoring method for stream-dwelling salmonids (time-delineated electrofishing surveys) and the efficacy of two translocation-based novel management strategies for salmonids and the European eel (Anguilla anguilla); intra- and inter-catchment translocation respectively. The data relate to the doctoral thesis by Luke Cameron entitled 'Refining monitoring practices and applying novel enhancement strategies to populations of threatened diadromous species', with each dataset corresponding to an individual thesis data chapter. The full thesis is available at: https://eprints.bournemouth.ac.uk/37040/ Datasets from chapters 2, 5 and 6 were collected as part of a series of large-scale field experiments conducted by Luke Cameron within the River Erriff catchment from 2019-2021, where Atlantic salmon (Salmo salar) post-emergent larvae ('fry') were translocated from identified high-density riffle sites to low-density riffle sites/stream reaches. This was followed by subsequent electrofishing surveys at the end of the summer period to determine the effects on salmon densities. These experiments were based on the hypothesis that this method could be used to reduce density-dependent mortality over the first summer following fry emergence at the catchment level, and thus increase freshwater production of Atlantic salmon, given this period is often considered a population bottleneck. Additionally, these experiments also included an additional element to evaluate the accuracy of a commonly applied population monitoring method for juvenile salmonids (time-delineated single-pass electrofishing surveys) versus a more established method with known accuracy (area-delineated single-pass electrofishing surveys). In 2019 and 2020 paired time-delineated and area delineated surveys were performed as part of the above experiments, with the former forming a component of the latter. This allowed direct comparison of fry abundance estimates, as provided by the two methods, recorded from the same habitat units at the same time. The datasets from Chapter 4 are adapted from a prior experiment conducted in 2015 by Lewis Naisbett-Jones to evaluate the efficacy of inter-catchment translocations of juvenile European eels in enabling eel colonisation of headwater stream habitats in Wales. Eels were released into the centre of stream reaches under two treatments; trout-populated and trout-free, as defined by the presence or absence of brown trout (Salmo trutta), to determine the effect of trout presence on eel colonisation success. Following release of eels in June, all stream reaches were surveyed using area-delineated single-pass electrofishing surveys in September to determine eel colonisation success. 2022-08-03 published Bournemouth University 10.18746/bmth.data.00000241 Mixed Luke Cameron (datasets listed under headings beginning 'Thesis chapter 2 dataset', 'Thesis chapter 5 dataset' & 'Thesis chapter 6 dataset') Lewis Naisbett-Jones (datasets listed under heading beginning 'Thesis chapter 4 dataset') bordar@bournemouth.ac.uk Principal investigator Cameron Luke lcameron650@gmail.com thesis https://eprints.bournemouth.ac.uk/37040/ pub Bournemouth University Inland Fisheries Ireland (IFI) Data from the dataset entitled 'Thesis Chapter 2 dataset' were collected by performing paired time- and area-delineated single-pass electrofishing surveys, with the former forming the initial component of the latter. The first 5 minutes of the area-delineated survey were timed and fish captured/missed recorded separately from those from the second component. The total area covered in each of the area-delineated surveys was measured using 5 cross channel transects and with a fixed site length of 20 m. An estimated area coverage metric was then calculated for the initial time-delineated part of the survey, based on upstream distance covered during this survey component and the mean site width. Habitat variables including proportions of substrate made up of particles in various size classes (silt-boulder/bedrock - recorded via modified Wolman pebble counts), macrophyte cover (recorded via modified Wolman pebble counts) and mean site depth (recorded via 5 depth measurements within each width transect) were also recorded for each electrofishing site. Data from the datasets entitled 'Thesis Chapter 4 dataset' were collected during inter-catchment translocation experiments involving juvenile European eels in Wales, UK. Juvenile glass eels were collected from the River Severn in April 2015 and reared for one month in captivity. Eels were released in batches of approximately 900 within 50 m release sites at the centre of 13 stream reaches, each measuring approximately 1 km in length, in June. Experimental treatments were defined by the presence (n = 7) or absence (n = 6) of brown trout within these stream reaches. Stream reaches were then revisited and electrofished using area-delineated single-pass electrofishing surveys in September 2015 to determine surviving eels numbers. Initial surveys covered the release site, as well as 20 m sections of stream at 30 m intervals upstream and downstream of this site. Lengths of captured eels and trout were measured. Site-level habitat variables were recorded for each electrofishing survey while stream level and stream reach level habitat and water chemistry variables were recorded at a single point within each stream reach. Data from the dataset entitled 'Thesis Chapter 5 dataset' were collected during intra-catchment translocation experiments involving juvenile Atlantic salmon (0+ age class, or 'fry') within the River Erriff catchment in 2019 and 2020. Salmon fry densities in the immediate post-emergence period were determined from area-delineated single-pass electrofishing surveys, as described above, in June/July 2019 and June 2020. Following these salmon fry were translocated from identified high fry density sites (high density source 'HDS' sites) to identified low fry density sites (low density recipient 'LDR' sites) in July 2019 and June/July 2020. These were performed by electrofishing of HDS sites, followed by adipose fin excision to mark translocated fry, and subsequent release of translocated fry at LDR sites. Individual translocation batches involved capturing fish from several HDS sites and releasing these at several LDR sites, with individual site-level capture target and released fry numbers based upon predetermined fry density targets, as outlined in more detail within the thesis. Each translocation batch was performed in a single day, with no fish held overnight. Identified high- and low-density sites which had no density manipulations were used as controls (HDC and LDC respectively). Repeat area-delineated electrofishing surveys were then completed in September 2019 and August/September 2020 at all sites to determine numbers and densities of translocated and non-translocated fry, as well as of older conspecifics and brown trout. All sites covered a single riffle and measured 20 m instream length with habitat variables recorded as described for the Chapter 2 dataset. Additionally, a number of 'hotspot' surveys were performed on short (5 m in 2019, 10 m in 2020) sections of riffle habitat upstream and downstream of LDR sites to determine patterns of dispersal for translocated salmon fry. Data from the dataset entitled 'Thesis Chapter 6 dataset' were collected during intra-catchment translocation experiments involving juvenile Atlantic salmon (0+ age class, or 'fry') within the River Erriff catchment in 2021. As in 2019 and 2020 salmon fry were translocated following identification of high and low density sites via area-delineated single-pass electrofishing surveys in June 2021. In June 2021 all salmon fry were translocated and released into the centre of 2 LDR stream reaches, approximately 500 m in length, with approximately 1500 fry released per stream reach. Additionally, 2 LDC stream reaches. measuring approximately 250 m in length. Both LDR and LDC stream reaches were then split up into individual sites based upon habitat units (i.e. pools and riffles). Translocations followed the same method of capture, adipose fin excision, and release as in 2019/2020, with these being completed in June. Repeat electrofishing surveys were performed in August/September 2021 to determine numbers and densities of translocated and non-translocated fry, as well as older conspecifics and other species. As in 2019/2020, habitat variables were recorded for each experimental site including proportions of substrate made up of particles in various classes (silt-boulder/bedrock - visually estimated), proportion of site area made up of pool, glide and riffle habitat and mean site depth. As the experimental work involving animals conducted by Luke Cameron involved performing minor surgical procedures (adipose fin excision), this underwent ethical review by Bournemouth University's internal ethics committee. Additionally, as these experiments were conducted within the Republic of Ireland (RoI), all work was also in compliance with the regulatory body for the RoI, the Health Products Regulatory Authority (HPRA). A non-technical project summary is available from the HPRA at: http://www.hpra.ie/docs/default-source/vet---non-techincal-project-summaries-folder/q2-2019-april-june/v008_2019q2.pdf?sfvrsn=2 2015-04-01 2021-09-30