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12 results for “Lamprey River”
Lower American River steelhead spawning surveys (Chinook and lamprey data included), California, 2002 to 2025
Steelhead spawning surveys have been conducted on the Lower American River (LAR) for the years 2002-2005, 2007, and 2009-2025. These surveys in conjunction with annual escapement estimates to Nimbus Fish Hatchery, are used to provide a yearly index of in-river and over all spawning abundance. Reclamation’s mission is to manage, develop and protect water and related resources in an environmentally and economically sound manner in the interest of the American people. In the National Marine Fisheries Service (NMFS) most recent biological opinion (2009), the presence of dams was identified as the most influential stressor to steelhead on the American River because it blocks passage to historic spawning and rearing habitat. Thus, Reclamation is required to monitor the effects of flow regulation by dams on the steelhead life stages present in the river system. Congruently, Reclamation has committed to significant restoration actions including salmonid spawning and rearing habitat rehabilitation on the Lower American River, which also require accurate and robust monitoring. These surveys support the mission and monitoring requirements of Reclamation by collecting the spawning data required to effectively conduct analyses of the effects of regulating Folsom and Nimbus dams on this federally listed species’ critical life stage development and support operational decision making.
Lamprey River New Hampshire Greenhouse Gas Data, 2014-2023
The Lamprey River watershed, located in southeastern New Hampshire (USA), drains 554 km² of low elevation land before discharging into the Great Bay Estuary (Wymore and others 2021). The watershed is classified as suburban with mixed land-use that includes forests (73%), wetlands (10%), development (7%), and agriculture (NOAA Coastal Change Analysis Program 2016). We selected four distinct sites within the watershed to capture the dynamics of both tributaries and the mainstem, while accounting for variations in land use, land cover, and nutrient availability. Wednesday Hill Brook (WHB) is a 1st-order stream that drains a residential landscape and has the highest NO3 concentrations among the sites due to a high density of septic systems (Flint and McDowell 2015). Dowst Cate Forest (DCF) is a 2nd-order stream draining a headwater wetland and forested landscape and is characterized by the highest concentrations of dissolved organic carbon (DOC). The two main stem Lamprey River sites, LMP72 and LMP73, exhibit moderate concentrations of both DOC and NO3 and are located approximately 1 km apart. LMP72 is located at a low-head run-of-river dam while LMP73 is free-flowing water downstream of the reservoir. Our dataset includes weekly water chemistry and dissolved gas data collected from April 2014 through May 2023, except for DCF where data collection ended in 2021, resulting in a total of 1,179 observations across the four different sites.
Small reservoir grab sample data, Parker, Ipswich, Lamprey, and Oyster River Watersheds, 2015 - 2020
This dataset contains water quality data from the inputs and outputs of eight reservoirs located in southeastern New Hampshire and northeastern Massachusetts. Samples were filtered in the field using Whatman GF/F filters with a nominal pore size of 0.7 µm and stored on ice until returned to the lab where they were frozen until analysis. Samples were analyzed for anions (NO3-, Cl-, SO4-, Br-) via ion chromatography on a Dionex Ion Chromatograph; NH4+ using a colorimetric method on a SmartChem Chemistry Analyzer; and total dissolved nitrogen (TDN) and dissolved organic carbon (DOC) via high-temperature oxidation on a Shimadzu TOC-V. DON was calculated as the difference between TDN and DIN (NO3- + NH4+). Samples correspond with individual sample names. Site (n = 8) indicate which reservoir each sample belongs to. Location indicates whether a sample was collected at the outflow or inflow ("UP", for reservoirs with one inflow) or "UP_1", "UP_2", or "UP_3" for sites with up to three inflows. CArea.km2 is the upstream drainage area estimated from the reservoir outflow while SArea.km2 is the surface area of each reservoir calculated via NHD+ polygons in GIS software. Temp.C is water temperature at the reservoir outflow on the day of sample collection while Discharge.m3s is the daily discharge scaled to the reservoir outflow from the nearest USGS gaging station. DIN.mgL, DON.mgL, and TDN.mgL are concentrations of dissolved inorganic nitrogen, dissolved organic nitrogen, and total dissolved nitrogen, respectively, in mg/L.
Chemistry of stream water for the Lamprey River Hydrologic Observatory
Stream water is collected at weekly to monthly intervals at several sites within the Lamprey River Hydrologic Observatory (LRHO). These data sets begin in 1999. Stream water grab samples are taken from a well-mixed portion of the stream channel on the routine sampling day (typically Tuesdays). Additional samples are collected during selected storm events. A continuous record of stream discharge is recorded by the United States Geological Survey (USGS 01073500) near the mouth of the Lamprey River and average daily and instantaneous stream discharge data are available. Hourly climate data are available from the NOAA NCDC U.S. Climate Reference Network (USCRN) at a station (NH Durham 2 SSW) in the lower part of the watershed. Field meters are used to determine dissolved oxygen, pH and conductivity in the stream and stream samples are filtered (pre-combusted 0.7 μm Whatman GF/F glass fiber filter) and frozen prior to analysis unless otherwise specified. All analyses were conducted at the Water Quality Analysis Laboratory at the University of New Hampshire.
Habitat Suitability Analysis of Larval Pacific Lamprey Habitat in the Columbia River Estuary
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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>
FIGURE 1 in Validity of Lampetra pacifica (Petromyzontiformes: Petromyzontidae), a brook lamprey described from the lower Columbia River Basin
FIGURE 1. Map of localities discussed in text. Type localities are indicated by species labels, and numbers correspond with identifiers in Table 1. Stars are localities for populations of L. pacifica; dots are localities for populations of L. richardsoni. The Tualatin River (4) includes three sampling sites, including McKay Creek.
FIGURE 3 in Validity of Lampetra pacifica (Petromyzontiformes: Petromyzontidae), a brook lamprey described from the lower Columbia River Basin
FIGURE 3. Percent sequence divergence (Kimura 2-parameter, K2P) in 1191 bp cyt b within and between Lampetra richardsoni and L. pacifica populations, including type localities (with*). All populations except the type locality of L. richardsoni (Smith Creek, Cultus Lake, BC) are in the Columbia Basin (see Map, Fig. 1). Tualatin specimens were from McKay Creek. Numbers of specimens in parentheses.
Data from: Riverscape genetics in brook lamprey: genetic diversity is less influenced by river fragmentation than by gene flow with the anadromous ecotype
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Phylogenetic and biogeographic history of brook lampreys (Lampetra: Petromyzontidae) in the river basins of the Adriatic Sea based on DNA barcode data
<p>Alignment used in Nexus format and resulting tree file from the ML analysis</p>
Data from: Low reproductive isolation and highly variable levels of gene flow reveal limited progress toward speciation between European river and brook lampreys
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FIGURE 2 in Validity of Lampetra pacifica (Petromyzontiformes: Petromyzontidae), a brook lamprey described from the lower Columbia River Basin
FIGURE 2. Trunk myomere counts for populations discussed in text. All populations except Lampetra richardsoni from British Columbia are from the Columbia Basin; those without citations are from the present study. Sample means are given in Results.
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