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133 results for “lamprey”
Data from: Form-assortative mating behaviors of individuals from parasitic and non-parasitic populations of Arctic lamprey (Lethenteron camtschaticum)
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Data from: Genetic identification of lamprey genera and anadromous ecotypes in watersheds of the Northeastern Pacific Ocean
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Dispersal and survival of sea lamprey in Lake Erie and connected waterways
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Data from: Discovery of prolactin-like in lamprey: Role in osmoregulation and new insight into the evolution of the growth hormone/prolactin family
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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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The Pacific lamprey genomic divergence, association mapping, temporal Willamette Falls, spatial rangewide datasets
<p>High rates of dispersal can breakdown coadapted gene complexes. However, concentrated genomic architecture (i.e., genomic islands of divergence) can suppress recombination to allow evolution of local adaptations despite high gene flow. Pacific lamprey (<em>Entosphenus tridentatus</em>) is a highly dispersive anadromous fish. Observed trait diversity and evidence for genetic basis of traits suggests it may be locally adapted. We addressed whether concentrated genomic architecture could influence local adaptation for Pacific lamprey. Using two new whole genome assemblies and genotypes from 7,716 single nucleotide polymorphism (SNP) loci in 518 individuals from across the species range, we identified four genomic islands of divergence (on chromosomes 01, 02, 04, and 22). We determined robust phenotype-by-genotype relationships by testing multiple traits across geographic sites. These trait associations likely explain genomic divergence across the species' range. We genotyped a subset of 302 broadly distributed SNPs in 2,145 individuals for association testing for adult body size, sexual maturity, migration distance and timing, adult swimming ability, and larval growth. Body size traits were strongly associated with SNPs on chromosomes 02 and 04. Moderate associations also implicated SNPs on chromosome 01 as being associated with variation in female maturity. Finally, we used candidate SNPs to extrapolate a heterogeneous spatiotemporal distribution of these predicted phenotypes based on independent datasets of larval and adult collections. These maturity and body size results guide future elucidation of factors driving regional optimization of these traits for fitness. Pacific lamprey is culturally important and imperiled. This research addresses biological uncertainties that challenge restoration efforts.</p>
Data from: Riverscape genetics in brook lamprey: genetic diversity is less influenced by river fragmentation than by gene flow with the anadromous ecotype
<p><span><span>Understanding the effect of human induced landscape fragmentation on gene flow and evolutionary potential of wild populations has become a major concern. Here, we investigated the effect of riverscape fragmentation on patterns of genetic diversity in the freshwater resident </span><span><span>European </span></span><span>brook lamprey (</span><i><span><span>Lampetra planeri</span></span></i><span>) that has a low ability to pass obstacles to migration. We also tested the hypotheses of i) asymmetric gene flow following water current and ii) a </span><span><span>positive effect of</span></span><span> admixture with the closely related anadromous</span><span><span> river lamprey</span></span><span> (</span><i><span><span>L. fluviatilis</span></span></i><i><span><span>)</span></span></i><span> ecotype on </span><i><span><span>L. planeri</span></span></i><span> genetic diversity. We genotyped 2472 individuals, including 225 </span><i><span><span>L. fluviatilis</span></span></i><span>, sampled </span><span><span>from</span></span><span> 81 sites upstream and downstream barriers to migration, in 29 </span><span><span>western </span></span><span>European rivers. Linear modelling revealed a strong positive relationship between </span><span><span>genetic diversity and</span></span><span> the distance </span><span><span>from </span></span><span><span>the</span></span><span><span> river</span></span><span> source, consistent with expected patterns of decreased gene flow into upstream populations. However, the presence of anthropogenic barriers had a moderate effect on spatial genetic structure. Accordingly, we found evidence for downstream-directed gene flow, supporting the hypothesis that barriers do not limit dispersal </span><span><span>mediated by</span></span><span> water flow. Downstream </span><i><span><span>L. planeri </span></span></i><span>populations in sympatry with </span><i><span><span>L. fluviatilis </span></span></i><span>displayed consistently higher genetic diversity. We conclude that genetic drift and slight downstream gene flow drive the genetic </span><span><span>make-</span></span><span>up of upstream </span><i><span><span>L. planeri </span></span></i><span>populations</span><i><span> </span></i><span>whereas admixture between ecotypes maintains higher levels of genetic diversity in </span><i><span><span>L. planeri </span></span></i><span>populations</span><i><span> </span></i><span>sympatric</span><i><span> </span></i><span>with </span><i><span><span>L. fluviatilis</span></span></i><span>. We discuss the implications of these results for the design of conservation strategies of lamprey, and other freshwater organisms with several ecotypes, in fragmented dendritic river networks. </span></span></p>
Chromosome‐level genome assembly of Lethenteron reissneri provides insights into lamprey evolution
<p>The reissner lamprey<i> Lethenteron reissneri</i> belonging to Cyclostomata, serves as a bridge between invertebrates and jawed vertebrates, and is considered the most direct ancestor of vertebrates. However, the genetic mechanisms underlying the adaptive evolution of lampreys remain unclear. Here, we supplied the genome data and annotation data of <em>Lethenteron reissneri</em>. Total 5 files were uploaded, including the assembled genome of <i>Lethenteron reissneri</i>, the gene annotation file in gff format, the gene function annotation file, the LIP gene sequences of 50 species used in the article, and the readme file. This study not only provides the first chromosome-level reference genome in Cyclostomata, but also indicates the unique biology and adaptive evolution of lampreys.</p>
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 2 in Eudontomyzon graecus, a new nonparasitic lamprey species from Greece (Petromyzontiformes: Petromyzontidae)
FIGURE 2. Oral disc of Eudontomyzon graecus, sp. n. A: holotype (immature male; CMNFI 1986–0741; disc length, 6.5 mm; TL, 136.5 mm); B: a paratype (immature female; CMNFI 1986–0720; disc length, 7.5 mm; TL, 141 mm). The photo of the paratype is from fig. 12e in Renaud (1982).
FIGURE 3 in Eudontomyzon graecus, a new nonparasitic lamprey species from Greece (Petromyzontiformes: Petromyzontidae)
FIGURE 3. Tail length residuals of 26 adults of Eudontomyzon graecus sp. n. (․) and 40 adults of E. hellenicus (˔) against their total length. The open symbols represent the respective holotypes. The horizontal line in the graph is the line of maximum separation (88%). Two pairs of E. graecus individuals lying above this line had identical coordinates; therefore, only 24 of 26 symbols are visible for this species.
FIGURE 1 in Eudontomyzon graecus, a new nonparasitic lamprey species from Greece (Petromyzontiformes: Petromyzontidae)
FIGURE 1. Lateral view of the holotype (immature male; CMNFI 1986–0741; TL, 136.5 mm) of Eudontomyzon graecus, sp. n.
FIGURE 4. A in Eudontomyzon graecus, a new nonparasitic lamprey species from Greece (Petromyzontiformes: Petromyzontidae)
FIGURE 4. A: Trunk length residuals of 18 ammocoetes of Eudontomyzon graecus sp. n. (․) and 219 ammocoetes of E. hellenicus (˔) against their total length. The horizontal line in the graph is the line of maximum separation (97%). One pair of E. graecus lying below this line had identical coordinates; therefore, only 25 of 26 symbols are visible for this species. Twenty pairs and two sets of three E. hellenicus individuals lying above this line had identical coordinates; therefore, only 195 symbols are visible for this species. B: Tail length residuals of 18 ammocoetes of Eudontomyzon graecus sp. n. (․) and 219 ammocoetes of E. hellenicus (˔) against their total length. The horizontal line in the graph is the line of maximum separation (97%). One E. graecus and one E. hellenicus individual lying above this line had identical coordinates and the symbol for E. graecus is the one that appears; therefore, all 18 individuals of E. graecus are visible on the graph. Twenty-four pairs and four sets of three E. hellenicus individuals lying below this line had identical coordinates; therefore, taking into account the individual with identical coordinates to the E. graecus mentioned above, only 186 symbols are visible for E. hellenicus.
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.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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