Folders: ROOT > ScienceBase Catalog > US Fish and Wildlife Service (USFWS) > Archive > Pacific Region, Region 1 ( Show direct descendants )
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River lamprey (Lampetra ayresl') metamorphose in late July with downstream migration occurring in the following year from May to July. Once adults enter salt water they begin to feed immediately by consuming chunks of flesh primarily from herring and young salmon. From June until September they increase in size by an estimated 11-14 cm and 12-18 g. [n 1975, 667 (XX) lamprey were estimated to be in the Strait of Georgia resulting in the deaths of60 000- (XX) juvenile fish. Between September and late winter river lamprey return to freshwater. Spawning occurs in the spring, from April to June and adults die after spawning. The length of adult life from the onset of metamorphosis until death following spawning is 2...
The modern diagnostic system of the genus Lethenteron is analyzed. Type specimens of the Arctic lamprey and its ammocoetes are defi ned. It is proposed that the total diversity of lampreys in Kamchatka Peninsula should be construed as several metapopulations, comprised of communities. Universal structure of the community is given, and its components (primary group and territorial community) are described.
Seasonal abundance, size, and prey selection of Pacific and river lamprey the Columbia River estuary
Power point presentation
The goal of this project is to enable and enlist our partners to address information needs identified in the Pacific Lamprey Conservation Agreement to promote Pacific Lamprey conservation. This will be accomplished by: 1) collaboratively collecting occupancy and distribution data; and 2) providing a Pacific Lamprey data clearinghouse for all partners.
The four goals of the Ocean Phase subgroup are: 1. To explicitly identify the many information gaps in the ocean phase of the life history of anadromous lampreys (Western River Lamprey and Pacific Lamprey). 2. To identify existing research, monitoring, and evaluation (RM&E) programs that may have data that could be used to fill in some of these information gaps. 3. To prioritize particular RM&E projects to be recommended and executed by researchers in the near future. 4. To set forth a plan for executing prioritized RM&E projects.
Contains GIS data on observations and distribution, information on sampling techniques, Nature Serve ranking maps and data, and other distribution maps/information.
Accurate knowledge of the distribution of rare, indicator, or invasive species is required for conservation and management decisions. However, species monitoring done with conventional methods may have limitations, such as being laborious in terms of cost and time, and often requires invasive sampling of specimens. Environmental DNA (eDNA) has been identified as a molecular tool that could overcome these limitations, particularly in aquatic systems. Detection of rare and invasive amphibians and fish in lake and river systems has been effective, but few studies have targeted macroinvertebrates in aquatic systems. We expanded eDNA techniques to a broad taxonomic array of macroinvertebrate species in river and lake...
We will report results of an ongoing project in the Deschutes River Subbasin to describe Pacific lamprey (Lampetra tridentata) life history. Project objectives were to determine adult lamprey escapement from Sherars Falls located at Rkm 70.4 and determine lamprey focal spawning areas, spawn timing and habitat through radio telemetry. A mark-recapture study and tribal creel was conducted to determine adult escapement. Lamprey were radio tagged and are currently being mobile, aerial and fixed site tracked to describe spawning. Adult lamprey were collected at Sherars Falls using a long-handled dip net from June – September 2007. The fate of lamprey collected at Sherars Falls was determined based on girth measurements....
Relationships among the 18 extant species of parasitic lamprey (Petromyzontiformes) were determined using a cladistic analysis of 32 mainly morphological characters. Because previous analyses support all known fossils as phylogenetically older or the same age as living lampreys, a composite agnathan fossil was used as an outgroup. A consensus of three equally parsimonious trees revealed a trichotomy between a monophyletic northern hemisphere clade and the southern hemisphere genera Geotria and Mordacia. The monophyletic status of the northern hemisphere lampreys and their classification in a single family Petromyzontidae was corroborated. It is suggested that the two southern hemisphere lamprey genera be retained...
Lampreys are representatives of an ancient vertebrate lineage that diverged from our own ~500 million years ago. By virtue of this deeply shared ancestry, the sea lamprey (P. marinus) genome is uniquely poised to provide insight into the ancestry of vertebrate genomes and the underlying principles of vertebrate biology. Here, we present the first lamprey whole-genome sequence and assembly. We note challenges faced owing to its high content of repetitive elements and GC bases, as well as the absence of broad-scale sequence information from closely related species. Analyses of the assembly indicate that two whole-genome duplications likely occurred before the divergence of ancestral lamprey and gnathostome lineages....
Summary 1. Using environmental DNA (eDNA) to detect aquatic macroorganisms is a new survey method with broad applicability. However, the origin, state and fate of aqueous macrobial eDNA – which collectively determine how well eDNA can serve as a proxy for directly observing organisms and how eDNA should be captured, purified and assayed – are poorly understood. 2. The size of aquatic particles provides clues about their origin, state and fate. We used sequential filtration size fractionation to measure the particle size distribution (PSD) of macrobial eDNA, specifically Common Carp (hereafter referred to as Carp) eDNA. We compared it to the PSDs of total eDNA (from all organisms) and suspended particle matter (SPM)....
Abstract: The sea lamprey is a species with high economic value in Portugal. During the spawning migration they are most active at night, and attain a ground speed that varies between 0.84 km h-1 and 1.5 km h-1. The duration of the larval stage in Portuguese rivers is between four and nine years and metamorphosis occurs from autumn to winter, with a peak in October-November. Larval distribution is strongly dependent upon sediment, especially particle size composition. Smaller individuals (20 mm < TL ≤ 60 mm) are commonly found on silty sand bottoms. Ammocoetes with a total length of 60 mm to 140 mm prefer a more heterogeneous substrate, where gravel and silt seem to make an identical contribution to sediment composition...
This folder contains spatial data with data available for download. Folder includes: Pacific Lamprey observations and distribution database NatureServe Assessment Rankings Watershed occurrence Link to interactive DataBasin map for Pacific Lamprey distribution Link to California online distribution map
Surveys of genetic variation have improved our understanding of the relationship between fitness-related phenotypes and their underlying genetic basis. However, how this information can be used to inform conservation has been unclear in many cases. The objective of this study was to combine next-generation genetic sequencing with traditional ecological knowledge to evaluate imperiled anadromous Pacific lamprey (Entosphenus tridentatus) and apply the findings to conservation in the context of resolving Native American traditional food security issues. In the Klamath River of California, a previously identified Pacific lamprey ocean-maturing ecotype was distinguished by a relatively advanced maturity of female fish...
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