Pyropia suborbiculata (Bangiales, Rhodophyta): first records from the northeastern Atlantic and Mediterranean of this North Pacific species

Phycologia ◽  
2013 ◽  
Vol 52 (2) ◽  
pp. 121-129 ◽  
Author(s):  
Alba Vergés ◽  
Noemí Sánchez ◽  
César Peteiro ◽  
Lluís Polo ◽  
Juliet Brodie
Keyword(s):  
North Pacific ◽  
Pacific Species ◽  
Northeastern Atlantic ◽  
Pyropia Suborbiculata

Relationships between some North Atlantic and North Pacific species of Porphyra (Bangiales, Rhodophyta): evidence from isozymes, morphology, and chromosomes

1992 ◽  
Vol 70 (7) ◽  
pp. 1355-1363 ◽  
Author(s):  
Sandra C. Lindstrom ◽  
Kathleen M. Cole
Keyword(s):  
Key Words ◽  
Sibling Species ◽  
North Atlantic ◽  
North Pacific ◽  
Type Specimens ◽  
Pacific Species ◽  
Key Words Biogeography

Five pairs of putative sibling species of Porphyra are recognized between the boreal North Atlantic and North Pacific oceans on the basis of similarities in isozymes, morphology, and chromosomes. These pairs are North Atlantic P. amplissima and North Pacific P. miniata (recognized here as P. cuneiformis), North Atlantic P. "leucosticta" and North Pacific P. fucicola, North Atlantic P. "linearis" and North Pacific P. pseudolinearis, North Atlantic P. miniata and North Pacific P. variegata, and North Atlantic P. "purpurea" and North Pacific P. "purpurea." Species names in quotation marks are tentative, pending verification by further studies, since at least two species are currently recognized by each of these names. Evidence from isozymes and morphology is used to support separation of P. amplissima and P. cuneiformis from P. miniata, and reference is made to their type specimens. Key words: biogeography, chromosomes, isozymes, morphology, Porphyra, vicariance.

Anatomy of an invasion: the trans-Arctic interchange

Paleobiology ◽  
1991 ◽  
Vol 17 (3) ◽  
pp. 281-307 ◽  
Author(s):  
Geerat J. Vermeij
Keyword(s):  
North Pacific ◽  
Absolute Number ◽  
The Arctic ◽  
Bering Strait ◽  
Western Atlantic ◽  
Early Pliocene ◽  
The North ◽  
The Asymmetry ◽  
The North Pacific ◽  
Northeastern Atlantic

When the Bering Strait between Alaska and Siberia opened about 3.5 Ma during the early Pliocene, cool-temperate and polar marine species were able to move between the North Pacific and Arctic-Atlantic basins. In order to investigate the extent, pattern, and dynamics of this trans-Arctic interchange, I reviewed the Recent and fossil distributions of post-Miocene shell-bearing Mollusca in each of five northern regions: (1) the northeastern Atlantic (Lofoten Islands to the eastern entrance of the English Channel and the northern entrance of the Irish Sea), (2) northwestern Atlantic (southern Labrador to Cape Cod), (3) northeastern Pacific (Bering Strait to Puget Sound), (4) northwestern Pacific (Bering Strait to Hokkaido and the northern Sea of Japan), and (5) Arctic (areas north of the Lofoten Islands, southern Labrador, and Bering Strait).I have identified 295 molluscan species that either took part in the interchange or are descended from taxa that did. Of these, 261 are of Pacific origin, whereas only 34 are of Arctic-Atlantic origin. Various analyses of the pattern of invasion confirm earlier work, indicating that there is a strong bias in favor of species with a Pacific origin.A geographical analysis of invaders implies that, although trans-Arctic interchange contributed to a homogenization of the biotas of the northern oceans, significant barriers to dispersal exist and have existed for trans-Arctic invaders within the Arctic-Atlantic basin. Nevertheless, trans-Arctic invaders in the Atlantic have significantly broader geographical ranges than do taxa with a pre-Pliocene history in the Atlantic.Among the possible explanations for the asymmetry of trans-Arctic invasion, two hypotheses were explicitly tested. The null hypothesis of diversity states that the number of invaders from a biota is proportional to the total number of species in that biota. Estimates of Recent molluscan diversity show that the North Pacific is 1.5 to 2.7 times richer than is the Arctic-Atlantic, depending on how faunistic comparisons are made. This difference in diversity is much smaller than is the asymmetry of trans-Arctic invasion in favor of Pacific species. Rough estimates of regional Pliocene diversity suggest that differences in diversity during the Pliocene were smaller than they are in the Recent fauna. The null hypothesis was therefore rejected.The hypothesis of ecological opportunity states that the number of invaders to a region is proportional to the number of species that became extinct there. The post-Early Pliocene magnitude of extinction was lowest in the North Pacific, intermediate in the northeastern Atlantic, and probably highest in the northwestern Atlantic. The absolute number and faunistic importance of post-Early Pliocene invaders (including trans-Arctic species, as well as taxa previously confined to warm-temperate waters and western Atlantic species that previously occurred only in the eastern Atlantic) was lowest in the North Pacific, intermediate in the northeastern Atlantic, and highest in the northwestern Atlantic. Further support for the hypothesis of ecological opportunity comes from the finding that hard-bottom communities, especially those in the northwestern Atlantic, show a higher representation of molluscan species of Pacific origin, and are likely to have been more affected by climatic events, than were communities on unconsolidated sandy and muddy bottoms. Support for the hypothesis does not rule out other explanations for the observed asymmetry of trans-Arctic invasion.A preliminary study of species-level evolution within lineages of trans-Arctic invaders indicates that anagenesis and cladogenesis have been more frequent among groups with Pacific origins than among those with Atlantic origins, and that the regions within the Arctic-Atlantic basin with the highest absolute number and faunistic representation of invaders (western Atlantic and Arctic) are the regions in which speciation has been least common among the invaders. The asymmetry of invasion is therefore distinct from the asymmetry of species-level evolution of invaders in the various northern marine regions.

Key Kamchatkan collections provide new taxonomic and distributional insights for reportedly pan–North Pacific species of Rhodymeniophycidae (Rhodophyta)

Phycologia ◽  
2017 ◽  
Vol 56 (3) ◽  
pp. 296-302 ◽  
Author(s):  
Gina V. Filloramo ◽  
Amanda M. Savoie ◽  
Olga N. Selivanova ◽  
Michael J. Wynne ◽  
Gary W. Saunders
Keyword(s):  
North Pacific ◽  
Pacific Species

scholarly journals Trigonelline and other Betaines in Species of Laminariales

2012 ◽  
Vol 7 (7) ◽  
pp. 1934578X1200700 ◽  
Author(s):  
Gerald Blunden ◽  
Michael D. Guiry ◽  
Louis D. Druehl ◽  
Kazuhiro Kogame ◽  
Hiroshi Kawai
Keyword(s):  
Nmr Spectroscopy ◽  
North Pacific ◽  
Aminobutyric Acid ◽  
H Nmr ◽  
The North ◽  
The Family ◽  
Consistent Feature ◽  
The North Pacific ◽  
Pacific Species

A collection of Laminariales species was made with examples in each of the presently recognized families of the order. Extracts of each species were examined for betaines, using primarily 1H NMR spectroscopy for their identification. Glycinebetaine was detected in all species tested and would appear to be a consistent feature of the Laminariales. γ-Aminobutyric acid betaine was found in all species of Laminaria examined and in three of the five Saccharina species (family Laminariaceae), but was not detected in species of either other genera of the family or in those of other Laminariales families. Trigonelline was found in some Laminaria and Saccharina species, as well as in the north Pacific species Postelsia palmaeformis ( Laminariaceae), Pseudochorda nagaii ( Pseudochordaceae) and Akkesiphycus lubricus ( Akkesiphycaceae).

Description of Laboratory-Reared Larvae of Paralithodes platypus (Decapoda, Anomura, Lithodidae)

1968 ◽  
Vol 25 (3) ◽  
pp. 439-455 ◽  
Author(s):  
Ethelwyn G. Hoffman
Keyword(s):  
North Pacific ◽  
Dorsal Surface ◽  
The Other ◽  
Frontal Area ◽  
King Crab ◽  
Larval Stages ◽  
Blue King Crab ◽  
Paralithodes Platypus ◽  
Pacific Species ◽  
Branchial Region

Larvae of the blue king crab, Paralithodes platypus (Brandt), were hatched and reared in the laboratory. All larval stages obtained developed in a manner similar to the development reported for other lithodid anomurans. In culture, P. platypus had four zoeal stages and a single glaucothoeal stage. The feature which distinguishes all zoeal stages of this species from zoeae of the other two North Pacific species of Paralithodes — P. camtschatica and P. brevipes — is the presence of 9 + 9 telson processes (including a hair-like second process) rather than 8 + 8 telson processes. Glaucothoes of P. platypus have one more pair of spines in the branchial region of the carapace than do those of P. camtschatica. Glaucothoes of P. platypus have 15 pairs of spines on the dorsal surface of the carapace, not including the spines of the frontal area (rostral complex) or the suborbital spines, whereas glaucothoes of P. camtschatica have 14 pairs of spines, and those of P. brevipes have 13 pairs.

The “Cribrilina annulata" problem and new species of Juxtacribrilina (Bryozoa: Cheilostomata: Cribrilinidae) from the North Pacific

Zootaxa ◽  
2021 ◽  
Vol 5016 (3) ◽  
pp. 333-364
Author(s):  
MATTHEW H. DICK ◽  
ANDREI V. GRISCHENKO ◽  
DENNIS P. GORDON ◽  
ANDREW N. OSTROVSKY
Keyword(s):  
North Pacific ◽  
Gulf Of Alaska ◽  
Commander Islands ◽  
The North ◽  
The Pacific ◽  
Shikotan Island ◽  
North Pacific Region ◽  
Circumpolar Arctic ◽  
The North Pacific ◽  
Pacific Species

Originally described from Greenland, Juxtacribrilina annulata (Fabricius, 1780) (previously known as Cribrilina annulata) has long been regarded as having a circumpolar, Arctic-boreal distribution. The genus Juxtacribrilina Yang, Seo, Min, Grischenko & Gordon, 2018 accommodated J. annulata and three related North Pacific species formerly in Cribrilina Gray, 1848 that lack avicularia, have a reduced (hood-like, cap-like, or vestigial) ooecium closely associated with modified latero-oral spines to form an ooecial complex, and produce frontally or marginally positioned dwarf ovicellate zooids. While the recently described NW Pacific species J. mutabilis and J. flavomaris, which have a vestigial ooecium like a short, flattened spine, clearly differ from J. annulata, the differences between J. annulata and other Pacific populations remained unclear. Here we provide descriptions for five species from the North Pacific region. We identified a specimen from the Sea of Okhotsk as J. annulata. Among the other four species, J. ezoensis n. sp. has a trans-Pacific distribution (abundant at Akkeshi, Hokkaido, Japan; also detected in the Commander Islands and at Ketchikan, Southeast Alaska); J. pushkini n. sp. was found only at Ketchikan; J. dobrovolskii n. sp. was found only at Shikotan Island in the Lesser Kuril Chain; and J. tumida n. sp. was found only at Kodiak, Gulf of Alaska. These four species all differ from J. annulata in having one or two frontal pore chambers on the proximal gymnocyst of most zooids; in budding frontal dwarf ovicellate zooids from these chambers rather than from basal pore chambers; in producing dwarf zooids more abundantly; and in having ooecia that are somewhat to markedly more reduced (cap-like rather than hood-like) and more closely integrated with the modified latero-oral spines. Furthermore, in the Pacific species, the ooecium in basal zooids arises from the roof of the distal pore chamber of the maternal zooid; ovicellate zooids can thus also bud a distal autozooid and are often arranged in columnar series with other zooids. In J. annulata, the hood-like kenozooidal ooecium budded from the maternal zooid replaces the distal autozooid, and ovicellate zooids are thus usually not embedded in a columnar series.  

scholarly journals Epimeria liui sp. nov., a new calcified amphipod (Amphipoda, Amphilochidea, Epimeriidae) from a seamount of the Caroline Plate, NW Pacific

ZooKeys ◽  
2020 ◽  
Vol 922 ◽  
pp. 1-11
Author(s):  
Yanrong Wang ◽  
Chaodong Zhu ◽  
Zhongli Sha ◽  
Xianqiu Ren
Keyword(s):  
New Species ◽  
North Pacific ◽  
The North ◽  
The North Pacific ◽  
Pacific Species

A calcified individual of Epimeria Costa, 1851 collected from an unnamed seamount of the Caroline Plate, NW Pacific, is recognized as new to science herein. This increases the number of known Epimeria species of the North Pacific to nine. Epimeria liuisp. nov. differs from its similar congeners by having a rostrum hardly reaching to the end margin of first peduncular article of antenna 1, the presence of large pyriform eyes, the size-increasing mid-dorsal teeth starting from pereonite 6 to pleonite 2, the projection on coxa 5 not extending to epimeral plate 1, and by having a nearly quadrate telson notched medially. To facilitate identification the new species is included in a key to Pacific species of Epimeria.

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