LAMPRITREMA NIPPONICUM YAMAGUTI (TREMATODA) FROM NEW HOSTS IN THE NORTH PACIFIC OCEAN, THE RELATIONSHIP OF DISTOMUM MIESCHERI ZSCHOKKE, AND THE STATUS OF THE FAMILY LAMPRITREMATIDAE

1962 ◽  
Vol 40 (5) ◽  
pp. 941-950
Author(s):  
L. Margolis
Keyword(s):  
North Pacific ◽  
North Pacific Ocean ◽  
Oncorhynchus Gorbuscha ◽  
The North ◽  
The Family ◽  
The Status ◽  
New Hosts ◽  
Relationship Of ◽  
The Relationship ◽  
The North Pacific

Lampritrema nipponicum is recorded from three new hosts in the North Pacific: Brama rayi (Bloch), Oncorhynchus nerka (Walbaum), and Oncorhynchus gorbuscha (Walbaum). Only immature specimens were found in the last two (evidently accidental) hosts. Distomum miescheri Zschokke is transferred to Lampritrema, becoming Lampritrema miescheri (Zschokke) nov. comb. This species possibly is identical with L. nipponicum. Lampritrematidae is considered a valid family, distinct from Hemiuridae sensu lato.

scholarly journals The Difference of Sea Level Variability by Steric Height and Altimetry in the North Pacific

2020 ◽  
Vol 12 (3) ◽  
pp. 379
Author(s):  
Qianran Zhang ◽  
Fangjie Yu ◽  
Ge Chen
Keyword(s):  
Sea Level ◽  
Ocean Circulation ◽  
North Pacific ◽  
Two Dimensions ◽  
Sea Level Variability ◽  
The North ◽  
Relationship Of ◽  
Along Track ◽  
The Relationship ◽  
The North Pacific

Sea level variability, which is less than ~100 km in scale, is important in upper-ocean circulation dynamics and is difficult to observe by existing altimetry observations; thus, interferometric altimetry, which effectively provides high-resolution observations over two swaths, was developed. However, validating the sea level variability in two dimensions is a difficult task. In theory, using the steric method to validate height variability in different pixels is feasible and has already been proven by modelled and altimetry gridded data. In this paper, we use Argo data around a typical mesoscale eddy and altimetry along-track data in the North Pacific to analyze the relationship between steric data and along-track data (SD-AD) at two points, which indicates the feasibility of the steric method. We also analyzed the result of SD-AD by the relationship of the distance of the Argo and the satellite in Point 1 (P1) and Point 2 (P2), the relationship of two Argo positions, the relationship of the distance between Argo positions and the eddy center and the relationship of the wind. The results showed that the relationship of the SD-AD can reach a correlation coefficient of ~0.98, the root mean square deviation (RMSD) was ~1.8 cm, the bias was ~0.6 cm. This proved that it is feasible to validate interferometric altimetry data using the steric method under these conditions.

scholarly journals Transhemispheric ecosystem disservices of pink salmon in a Pacific Ocean macrosystem

2018 ◽  
Vol 115 (22) ◽  
pp. E5038-E5045 ◽  
Author(s):  
Alan M. Springer ◽  
Gus B. van Vliet ◽  
Natalie Bool ◽  
Mike Crowley ◽  
Peter Fullagar ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Pink Salmon ◽  
Oncorhynchus Gorbuscha ◽  
Geographic Scale ◽  
The North ◽  
Basin Scale ◽  
Ecosystem Disservices ◽  
The North Pacific

Pink salmon (Oncorhynchus gorbuscha) in the North Pacific Ocean have flourished since the 1970s, with growth in wild populations augmented by rising hatchery production. As their abundance has grown, so too has evidence that they are having important effects on other species and on ocean ecosystems. In alternating years of high abundance, they can initiate pelagic trophic cascades in the northern North Pacific Ocean and Bering Sea and depress the availability of common prey resources of other species of salmon, resident seabirds, and other pelagic species. We now propose that the geographic scale of ecosystem disservices of pink salmon is far greater due to a 15,000-kilometer transhemispheric teleconnection in a Pacific Ocean macrosystem maintained by short-tailed shearwaters (Ardenna tenuirostris), seabirds that migrate annually between their nesting grounds in the South Pacific Ocean and wintering grounds in the North Pacific Ocean. Over this century, the frequency and magnitude of mass mortalities of shearwaters as they arrive in Australia, and their abundance and productivity, have been related to the abundance of pink salmon. This has influenced human social, economic, and cultural traditions there, and has the potential to alter the role shearwaters play in insular terrestrial ecology. We can view the unique biennial pulses of pink salmon as a large, replicated, natural experiment that offers basin-scale opportunities to better learn how these ecosystems function. By exploring trophic interaction chains driven by pink salmon, we may achieve a deeper conservation conscientiousness for these northern open oceans.

Number of Circuli and Time of Annulus Formation on Scales of Pink Salmon (Oncorhynchus gorbuscha)

1966 ◽  
Vol 23 (5) ◽  
pp. 747-756 ◽  
Author(s):  
Roger E. Pearson
Keyword(s):  
North America ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Pink Salmon ◽  
Fork Length ◽  
Oncorhynchus Gorbuscha ◽  
Pink Salmon Oncorhynchus Gorbuscha ◽  
Annulus Formation ◽  
Relationship Of ◽  
The Relationship

Mean numbers of circuli on scales of juvenile pink salmon collected along the coast of North America in 1964 increased from 1.7 on June 23 to 17.4 on September 10. On scales of adults collected from the eastern North Pacific Ocean from 1962 to 1965, mean numbers of circuli ranged from 24.1 on January 23 (1964) to 46.9 on September 2 (1962). The fork length at time of scale formation was approximately 60 mm. Mean fork length increased with the total number of circuli. The relationship of fork length to number of scale circuli showed some variation between stocks. The winter ring was present or was being formed on the majority of scales taken in late January. The development of the annulus varied considerably among individual fish.

Revision of the Alitta virens species complex (Annelida: Nereididae) from the North Pacific Ocean

Zootaxa ◽  
2018 ◽  
Vol 4483 (2) ◽  
pp. 201 ◽  
Author(s):  
TULIO F. VILLALOBOS-GUERRERO ◽  
TORKILD BAKKEN
Keyword(s):  
Pacific Ocean ◽  
North Pacific ◽  
Species Complex ◽  
North Pacific Ocean ◽  
Valid Species ◽  
Distinctive Features ◽  
The North ◽  
The Status ◽  
First Time ◽  
The North Pacific

Alitta virens species complex encompasses elongate nereidids appreciated commercially both in the fishing and aquaculture industries. This complex has been well studied in biological and ecological terms. Nevertheless, detailed taxonomic analyses have scarcely been addressed, to the extent that only a few species in the complex have been recognized as valid but with some difficulties: Alitta brandti Malmgren, 1865 (Sea of Okhotsk), A. grandis (Stimpson, 1853) (northeastern USA) and A. virens (Sars, 1835) (Norway). Whereas, other several species have typically been regarded as synonyms, including those originally described from the North Pacific Ocean: Nereis (Alitta) virens plenidentata Moore, 1909 (California, USA), Nereis dyamusi Izuka, 1912 (Japan) and Nereis foliata Baird, 1863 (Vancouver, Canada). In this study, an examination of the immature and epitoke type and non-type material available for the A. virens species complex from the North Pacific was carried out. Herein, the status of A. brandti as a valid species is reinforced being clearly distinct from A. virens and related species. Alitta dyamusi n. comb., A. plenidentata n. comb. and A. williami nom. nov. are reinstated and transferred to Alitta, the specific epithet of the latter species is a replacement name for Nereis foliata Baird, 1863, which is a junior, primary homonym of Nereis foliata Dalyell, 1853. Lectotypes for A. plenidentata n. comb. and A. williami nom. nov. are designated. The North Pacific species of the A. virens complex, excluding A. plenidentata n. comb. which has several distinctive features that differ from all the Alitta species, are characterized by having homogomph spinigers in both supracicular and subacicular neurochaetae, oral ring with a larger number of rows and paragnaths, and epitoke males with unmetamorphosed pygidium and epitoke-modified chaetae in both neuropodial fascicles. The morphology of epitoke females in the A. virens complex is described for the first time. Identification keys to atoke and epitoke species of this complex are also provided. 

Preliminary Description of an Unusual Gonatid Squid (Cephalopoda: Oegopsida) from the North Pacific

1971 ◽  
Vol 28 (11) ◽  
pp. 1796-1801 ◽  
Author(s):  
W. Gordon Fields ◽  
Veronica A. Gauley
Keyword(s):  
New Species ◽  
North Pacific ◽  
New Genus ◽  
North Pacific Ocean ◽  
The North ◽  
The Family ◽  
The North Pacific ◽  
Preliminary Description ◽  
A New Species ◽  
Unusual Type

Descriptions are given of two specimens of an unusual type of gonatid squid taken from the North Pacific Ocean. A discussion is made of their relationship to two existing genera, Gonatus and Berryteuthis, of the family Gonatidae, and a note is included on a North Pacific gonatid larva that may be a related earlier stage of these two specimens. Because of their size and condition, neither a new genus nor a new species is declared; however, on the basis of these records, it is suggested that there is a need for a redefinition of the genera of the family Gonatidae.

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