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133 results for “lamprey”
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.
Figure 2 in The Importance Of Natura 2000 Sites And Their Management For The Conservation Of Freshwater Fish, Lamprey And Crayfish In Latvia
Figure 2. Occurrence of threatened freshwater fish, lamprey and crayfish species (n=15) in N2000 and outside N2000 at GC5, grouped by 0–10 %; 10–25 %; 25–50 %;>50 % with species numbers 0–1; 2–3; 4–7; 8–12.
Figure 1 in The Importance Of Natura 2000 Sites And Their Management For The Conservation Of Freshwater Fish, Lamprey And Crayfish In Latvia
Figure 1. Occurrence of freshwater fish, lamprey and crayfish species (n=46) within Natura 2000 outside N2000 at GC5, grouped by 0–10 %; 10–25 %; 25–50 %;>50 % with species numbers 0–4; 5–11; 12–23; 24–40.
Figure 3 in The Importance Of Natura 2000 Sites And Their Management For The Conservation Of Freshwater Fish, Lamprey And Crayfish In Latvia
Figure 3. Occurrence of migratory freshwater fish and lamprey species (n=5) in N2000 and outside N2000 at GC5 cells, grouped by 0–10 %; 10–25 %; 25–50 %;>50 % with species numbers 0; 1; 2; 3–5.
Figure 4 in The Importance Of Natura 2000 Sites And Their Management For The Conservation Of Freshwater Fish, Lamprey And Crayfish In Latvia
Figure 4. Occurrence of introduced freshwater fish, lamprey and crayfish species (n=6) in N2000 and outside N2000 at GC5 cells, grouped by 0–10 %; 10–25 %; 25–50 %;>50 % with species numbers 0; 1; 2–3; 4.
Fig. 1 in Five Trophically-transmitted Parasites from Adult Arctic Lampreys Lethenteron camtschaticum (Petromyzontiformes: Petromyzontidae): Biological Indicators of the Host's Marine Life as a Predator
Fig. 1. Endoparasites from adult Arctic lampreys Lethenteron camtschaticum (Tilesius, 1811) from the Ishikari River, Hokkaido. A, Brachyphallus crenatus (Rudolphi, 1802); B, Lecithaster gibbosus (Rudolphi, 1802); C, Nybelinia surmenicola (Okada in Dollfus, 1929); D, metabasal armature of a tentacle of N. surmenicola; E, tetraphyllidean plerocercoid; F, male specimen of Bolbosoma sp.; G, female specimen of Bolbosoma sp. Scale bars: A–B, 500 µm; C, E–G, 2 mm; D, 50 µm.
FIG. 3 in A new look at the Cretaceous Lamprey Mesomyzon Chang, Zhang & Miao, 2006 from the Jehol Biota
FIG. 3. — Mesomyzon mengae Chang, Zhang & Miao, 2006, head, branchial region, and fins. Photographs of: A, IVPP V 15027A; B, IVPP V 15035A; photograph (C) and line drawing (D) of IVPP V 15449; photograph (E) and line drawing (F) of IVPP V 15450.3; G, photograph of the tail of IVPP V 15449, the arrow points to the anal fold; H, close-up of middle trunk of IVPP V 14981B. Abbreviations: ac, annular cartilage; adc, anterior dorsal cartilage; adf, anterior dorsal fin; ao, anterior pillar of subocular cartilage; ap, apicalis and the laminae it carries; atr, naso-hypophysial atrium; ba, imprints of brain; bb, branchial basket; cot, circumoral teeth; da, dorsal aorta; dt, detritus in intestine; eh, extra hyal arch; m, mouth; gp1, gp7, 1st and 7th gill pouch; il, infraoral lamina; lv, liver; no, external narial opening; nhp, hypophysial pouch; gl, gill filaments; gf(l, r), gill filaments of left and right gills; gp, infillings of gular pouch; lo, olfactory organ; my, myomeres; nlp, posterior lateral nerve; ns, nasal sac; oc, otic capsule; oca, oral cavity; op, oral papillae; of, oral fimbriae; p, piston cartilage; paf, preanal skin fold; pc, pericardial cartilage; pdc, posterior dorsal cartilage; sl, supraoral lamina; st, styliform; tel, telencephalon; vs, velar skeleton; I, olfactory nerve or tract; V1, ophthalmic ramus of trigeminal nerve; VII. uc, buccal ramus of facial nerve; VII.rec, recurrent ramus of facial nerve surrounding labyrinth; IX, glossopharyngeus nerve; X, vagus nerve. See Figure 2 for other abbreviations. Anterior facing left in all figures. Scale bars: 10 mm.
FIG. 2 in A new look at the Cretaceous Lamprey Mesomyzon Chang, Zhang & Miao, 2006 from the Jehol Biota
FIG. 2. — Mesomyzon mengae Chang, Zhang & Miao, 2006, new adult individuals and morphological restoration: A, photograph of IVPP V 15027; B, photograph of IVPP V 15449; C, photograph of IVPP V 14981B; D, restoration of the general appearance of Mesomyzon, dotted circle behind the eyes representing the otic capsule. Abbreviations: adf, anterior dorsal fin; bp, branchial pouches; cf, caudal fin; cl, cloaca; e, eye(s); egp, external gill pores; od, oral disc; pdf, posterior dorsal fin. Scale bars: 10 mm.
FIG. 1 in A new look at the Cretaceous Lamprey Mesomyzon Chang, Zhang & Miao, 2006 from the Jehol Biota
FIG. 1. — Generalized anatomy of living lampreys: A, schematic sagittal section through head and pharyngeal region; the vessels, esophagus, respiratory tube, and parts of the heart are shown with portions cut away, rather than in sagittal section; redrawn after De Iuliis & Pulerà 2011, with the structures of the nasohypophysial complex labelled after Janvier 1974; B, the cranial skeleton of an adult lamprey, redrawn after Hardisty & Potter 1981; C, arrangement pattern of the cranial nerves, redrawn after Marinelli & Strenger 1954; D, oral disc of an adult lamprey showing the keratinous teeth and other associated structures. The dotted lines delineate the various fields. Redrawn after Renaud 2011.
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).
Figure 3 in Presence of larvae of lampreys, Lampetra sp. (Cephalaspidomorphi, Petromyzontiformes), in a French Catalan basin
Figure 3. – Neighbourg-Joining barcoding tree with the COI marker (642 bp) of European Lampetra spp. and Petromyzon marinus (94 specimens) iden- tifying the three ammocoetes caught at Nefiach. Numbers at nodes correspond to bootstrap values. Grey box refers to the complex [Lampetra fluviatilis + Lampetra planeri].
Figure 1 in Presence of larvae of lampreys, Lampetra sp. (Cephalaspidomorphi, Petromyzontiformes), in a French Catalan basin
Figure 1. – The Têt River in the Pyrénées-Orientales department and the lamprey location at Nefiach (square).
Figure 2. – A in Presence of larvae of lampreys, Lampetra sp. (Cephalaspidomorphi, Petromyzontiformes), in a French Catalan basin
Figure 2. – A: Three of the six lamprey larvae, or ammocoetes, belonging to the genus Lampetra caught in the Têt River at Nefiach (MNHN 2016-0363). B, C: Enlargement of the head and tail showing the absence of pigmentation respectively on the snout and on the extremity of the caudal fin (arrows). Scale bars = 1 cm.
Figure 1. - Study stream locations where lamprey were collected. 1 in A genetic method to differentiate Petromyzon marinus ammocoetes from those of the paired species Lampetra fluviatilis and L. planeri
Figure 1. - Study stream locations where lamprey were collected. 1: Gironde basin; 1a: Livenne River; 1b: Dronne River; 1c: Dordogne River; 1d: Cere River; 2: Loire basin; 3: Meuse basin.
Figure 13 in REVIEW Vertebrate origins are informed by larval lampreys (ammocoetes): a response to Miyashita et al., 2021
Figure 13. Yolk-sac hatchling of the Carboniferous lamprey Pipiscius, drawn from the fossil specimen in figure 2 of Miyashita et al. (2021). Its mouth opening, in the oral funnel, is the secondary mouth-opening of adult lampreys. To indicate this, it is coloured blue as in Figure 12C.
Figure 9 in REVIEW Vertebrate origins are informed by larval lampreys (ammocoetes): a response to Miyashita et al., 2021
Figure 9. The three clades of ostracoderm fishes that had bony head shields, with impressions from or on the inner surfaces of these head shields. This shows my interpretations of the specific branchial arches and gill pouches, with yellow marking the first ones. A, heterostracan Protopteraspis (Simopteraspis) primaeva Kiaer, 1928 (after fig. 197A in Stensio, 1958); B, osteostracan Scolenaspis signata Wangsjo, 1952 (after fig. 7 in Janvier, 1985); C, galeaspid Shuyu zhejiangensis, natural endocast (after fig. 1a in Gai et al., 2011).
Figure 8 in REVIEW Vertebrate origins are informed by larval lampreys (ammocoetes): a response to Miyashita et al., 2021
Figure 8. Pharynxes of lampreys and a jawed shark, compared. Frontal sections. A, ammocoete; B, adult lamprey; C, shark; D, an enlarged gill of each. The similarities are emphasized by colour-coding. The blue arrows in (A–C) show the direction of flow of the ventilatory water. In (A) the green skeletal arches are made of mucocartilage and the purple arches consist of typical, cellular cartilage (hyaline). The extrabranchial cartilages of sharks are comparable to the external branchial arches of lampreys. (A) is redrawn from Mallatt & Ridgway (1984), (B) from various sources including Randall (1972), (C) from Mallatt (1997/98) and (D) from Mallatt (1996).
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
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OpenNeuro
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