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45 results for “sea lamprey”
Figure 1 in Lampetra soljani, a new brook lamprey from the southern Adriatic Sea basin (Petromyzontiformes: Petromyzontidae)
Figure 1. – Micropterus salmoides (22.6 cm TL) from Mala Neretva River (catalogue number MS-IOR 101016).
Figure 2 in Lampetra soljani, a new brook lamprey from the southern Adriatic Sea basin (Petromyzontiformes: Petromyzontidae)
Figure 2. – Catch location of M. salmoides (near Opuzen, Neretva River delta, Adriatic drainage system of Croatia).
Forecasting suppression of invasive Sea Lamprey in Lake Superior: data and code for Bayesian forecast model
<p>Resource managers frequently are tasked with mitigating or reversing adverse effects of invasive species through management policies and actions. In Lake Superior, of the Laurentian Great Lakes, invasive sea lamprey populations are suppressed to protect valuable fish stocks. However, the relationship between choice of long-term control strategy and the future chance of achieving the suppression target is unclear.</p> <p>Using a 60+ year time-series of suppression effort and monitoring data from 50 assessment sites located on Lake Superior tributaries, we developed a Bayesian state-space model to forecast the probability of suppressing lamprey below the suppression target.</p> <p>With annual application of lampricide (i.e., lamprey-specific pesticide) at historical mean levels, we forecasted a 15% chance of achieving the Lake Superior sea lamprey suppression target in 2040.</p> <p>Increasing lampricide effort and/or supplementing lampricide control with age-1 recruitment reduction increased suppression chance. Annual application of the maximum historical lampricide effort resulted in a 50% predicted chance of achieving the target, annual application of the mean historic lampricide effort plus a 40% reduction in recruitment resulted in a 54% chance, and the maximum amount of effort considered (maximum historic lampricide and 60% reduction in recruitment) resulted in a 94% chance.</p> <p><em><a>Policy </a>implications</em>. <a>We</a> developed a simulation model from a robust, long-term monitoring dataset that improves understanding of why long-term sea lamprey suppression objectives have been difficult to achieve in Lake Superior. Furthermore, the model provides a means to gauge efficacy of sea lamprey control policy and action scenarios based on forecasted chance of achieving the suppression target. Creating processes for iteratively refining our forecasting model with stakeholder and technical-expert input and integration with a decision analysis framework could strengthen the link between ecological knowledge obtained from long-term monitoring and invasive sea lamprey management.</p>
Juvenile and adult sea Lamprey behaviour (twitch and movement)
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Forecasting suppression of invasive Sea Lamprey in Lake Superior: data and code for Bayesian forecast model
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Dispersal and survival of sea lamprey in Lake Erie and connected waterways
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Data and code from: Male sea lamprey countersignal relative to their baseline pheromone but not the intensity of rivals’ signals
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Data from: Identifying spawning sites and other critical habitat in lotic systems using eDNA "snapshots": a case study using the sea lamprey Petromyzon marinus L.
Many aquatic species of conservation concern exist at low densities and are inherently difficult to detect or monitor using conventional methods. However, the introduction of environmental (e)DNA has recently transformed our ability to detect these species and enables effective deployment of limited conservation resources. Identifying areas for breeding, as well as the ecological distribution of a species are vital to the survival or recovery of a conservation species (i.e. critical habitat). In many species, spawning events are associated with a higher relative abundance of DNA released within an aquatic system (i.e. gametes, skin cells etc.), making this the ideal time to monitor these species using eDNA techniques. This study aims to examine whether a 'snapshot' eDNA sampling approach (i.e. samples taken at fixed points in chronological time) could reveal areas of critical habitat including spawning sites for our target species Petromyzon marinus. We utilised a species-specific qPCR assay to monitor spatial and temporal patterns in eDNA concentration within two river catchments in Ireland over three consecutive years. We found that eDNA concentration increased at the onset of observed spawning activity and patterns of concentration increased from downstream to upstream over time, suggesting dispersal into the higher reaches as the spawning season progressed. We found P. marinus to be present upstream of several potential barriers to migration, sometimes in significant numbers. Out results also show that the addition of lamprey-specific fish-pass at an 'impassable' weir, although assisting in ascent, did not have any significant impact on eDNA concentration upstream after pass had been installed. eDNA concentration was also found to be significantly correlated with both the number of fish and the number of nests encountered. The application of snapshot sampling techniques for species monitoring therefore has substantial potential for the management of low-density species in fast-moving aquatic systems.
Data from: A simple, cost-effective emitter for controlled release of fish pheromones: development, testing, and application to management of the invasive sea lamprey
Semiochemicals that elicit species-specific attraction or repulsion have proven useful in the management of terrestrial pests and hold considerable promise for control of nuisance aquatic species, particularly invasive fishes. Because aquatic ecosystems are typically large and open, use of a semiochemical to control a spatially dispersed invader will require the development of a cost-effective emitter that is easy to produce, environmentally benign, inexpensive, and controls the release of the semiochemical without altering its structure. We examined the release properties of five polymers, and chose polyethylene glycol (PEG) as the best alternative. In a series of laboratory and field experiments, we examined the response of the invasive sea lamprey to PEG, and to a partial sex pheromone emitted from PEG that has proven effective as a trap bait to capture migrating sea lamprey prior to spawning. Our findings confirm that the sea lamprey does not behaviorally respond to PEG, and that the attractant response to the pheromone component was conserved when emitted from PEG. Further, we deployed the pheromone-PEG emitters as trap bait during typical control operations in three Great Lakes tributaries, observing similar improvements in trap performance when compared to a previous study using mechanically pumped liquid pheromone. Finally, the polymer emitters tended to dissolve unevenly in high flow conditions. We demonstrate that housing the emitter stabilizes the dissolution rate at high water velocity. We conclude the performance characteristics of PEG emitters to achieve controlled-release of a semiochemical are sufficient to recommend its use in conservation and management activities related to native and invasive aquatic organisms.
FIGURE 8. Lampetra soljani, FSJF 3650 in Lampetra soljani, a new brook lamprey from the southern Adriatic Sea basin (Petromyzontiformes: Petromyzontidae)
FIGURE 8. Lampetra soljani, FSJF 3650, paratypes, about 120 mm TL; Bosnia and Herzegovina: side-arm of Neretva River east of Čapljina; 16–17 Jan. 2015.
FIGURE 7 in Lampetra soljani, a new brook lamprey from the southern Adriatic Sea basin (Petromyzontiformes: Petromyzontidae)
FIGURE 7. Lampetra soljani, not preserved, ammocoetes, about 130 mm TL; Bosnia and Herzegovina: side-arm of Neretva River east of Čapljina; 17 Sep. 2014..
FIGURE 3 in Lampetra soljani, a new brook lamprey from the southern Adriatic Sea basin (Petromyzontiformes: Petromyzontidae)
FIGURE 3. Lampetra soljani, from the top, ZFMK-ICH 103666, holotype, 109 mm TL; FSJF 3650, paratypes, 104 mm TL, 102 mm TL, 117 mm TL; Bosnia and Herzegovina: side-arm of Neretva River east of Čapljina; 16–17 Jan. 2015.
FIGURE 2 in Lampetra soljani, a new brook lamprey from the southern Adriatic Sea basin (Petromyzontiformes: Petromyzontidae)
FIGURE 2. Median-joining network of the COI haplotypes. Circle size corresponds to sample size; one bar indicates an additional mutational step. Small black circles represent median vectors, i.e., hypothetical, reconstructed haplotypes.
FIGURE 6. Lampetra soljani, FSJF 1037 in Lampetra soljani, a new brook lamprey from the southern Adriatic Sea basin (Petromyzontiformes: Petromyzontidae)
FIGURE 6. Lampetra soljani, FSJF 1037, paratype, post-spawning adult, 111 mm TL, Bosnia-Herzegovina: Bregava north of Klepci; 12 May 2003.
FIGURE 1 in Lampetra soljani, a new brook lamprey from the southern Adriatic Sea basin (Petromyzontiformes: Petromyzontidae)
FIGURE 1. Maximum likelihood estimation of the phylogenetic relationships based on the mitochondrial COI barcode region (Tamura 3-parameter model, discrete Gamma distribution for rate differences with 5 categories +G parameter = 0.3409). Nucleotide positions with less than 100% site coverage were eliminated resulting in 652 analysed positions. Numbers of major nodes indicate bootstrap values from 1000 pseudoreplicates from the ML, NJ and MP method. The tree is drawn to scale (except to outgroup), with branch lengths measured in number of substitutions per site.
FIGURE 4. Lampetra soljani, FSJF 3650 in Lampetra soljani, a new brook lamprey from the southern Adriatic Sea basin (Petromyzontiformes: Petromyzontidae)
FIGURE 4. Lampetra soljani, FSJF 3650, paratypes, pre-spawning adults, from the top, 124 mm TL, 128 mm TL; Bosnia and Herzegovina: side-arm of Neretva River east of Čapljina; 16–17 Jan. 2015.
FIGURE 7 in Lethenteron ninae, a new nonparasitic lamprey species from the north-eastern Black Sea basin (Petromyzontiformes: Petromyzontidae)
FIGURE 7. Tongue precursor in ammocoete. a, Lethenteron ninae (paratype); b, Eudontomyzon mariae (ZISP 29159). 1, bulb; 2, cirri.
FIGURE 6 in Lethenteron ninae, a new nonparasitic lamprey species from the north-eastern Black Sea basin (Petromyzontiformes: Petromyzontidae)
FIGURE 6. Lethenteron ninae, holotype (photo made from live specimen, ZISP 54431, TL (measured after preservation) 163.8 mm, Shakhe River).
FIGURE 3. Oral disc. a in Lethenteron ninae, a new nonparasitic lamprey species from the north-eastern Black Sea basin (Petromyzontiformes: Petromyzontidae)
FIGURE 3. Oral disc. a, Lethenteron ninae, holotype (photo made from live specimen, ZISP 54431, TL (after preservation) 163.8 mm, Shakhe River); b, Eudontomyzon mariae (from Berg 1931: Pl. 4, FIGURE 2, syntype, TL 192 mm). 1, supraoral lamina; 2, infraoral lamina; 3, posterial teeth (one incomplete row in L. ninae and three rows in E. mariae); 4, anterior endolateral bicuspid tooth; 5, row of marginal teeth; 6, fimbriae; 7, ventral pigmented neuromast; 8, exolateral teeth; 9, transverse lingual lamina.
FIGURE 4. Transverse lingual lamina. a in Lethenteron ninae, a new nonparasitic lamprey species from the north-eastern Black Sea basin (Petromyzontiformes: Petromyzontidae)
FIGURE 4. Transverse lingual lamina. a, Lethenteron ninae, paratype (formula 6u-I-5u); b, Eudontomyzon mariae, syntype (formula 1u-I-2u). Scale bar: 1 mm. Arrows show the differences.
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
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