Three of the species without significant responses at this site--fourhorn sculpin (Myoxocephalus quadricornis
), rainbow smelt (Osmerus mordax), and Arctic flounder (Pleuronectes glacialis)-are nearshore marine species that are less tolerant of low salinities than the other species assessed in BACI analyses, all of which were anadromous or amphidromous.
Observations of a wild polar bear (Ursus maritimus) successfully fishing arctic charr (Salvelinus alpinus) and fourhorn sculpin (Myoxocephalus quadricornis
Cottidae: Myoxocephalus quadricornis
(fourhorn sculpin), UAMZ4645 (two specimens); M.
Bioaccumulation of mercury in Myoxocephalus quadricornis
Vertebral deformities and physiological effects in fourhorn sculpin (Myoxocephalus quadricornis
) after long-term exposure to a simulated heavy metal-containing effluent.
The waters of the taiga zone also contain species of recent marine origin, such as some sponges, the polychaete Manayunka baicalensis (in the basin of the Yenisey), the fish called the fourhorn sculpin Myoxocephalus quadricornis
, as well as two subspecies of the ringed Baltic seal, the Ladoga ringed seal (Phoca hispidas ladogensis) and the Saimaa ringed seal (P.
Dietary data for lake trout (Salvelinus namaycush) and common prey fish species of lake trout ("pelagic forage fish"): Coregonids (Coregonus sp., Prosopium sp.), smelt (Osmerus mordax), alewife (Alosa pseudoharengus), sculpins (Cottus sp., Myoxocephalus quadricornis
), ninespine stickleback (Pungitius pungitius), and trout-perch (Percopsis omiscomaycus) were collected from the literature, Ontario and Quebec Government files and documents, and our own data (lake trout: n = 92 lakes, 47 681 individual fish; forage fish species; n = 117 lakes, 47 734 individual fish).
75 Fourhorn sculpin (Myoxocephalus quadricornis
) * 255(7) Arctic sculpin (Myoxocephalus scorpioides) * 3 Shorthorn sculpin (Myoxocephalus scorpius) 11(1) Ribbed sculpin (Triglops pingelii) * 1 Tubenose poacher (Pallasina barbata) 1 Liparis sp.
In Norton Bay, there are several runs of salmon of different species, herring (Clupea pallasi), tomcod (Eleginus gracilis), flounder (Liopsetta glacialis, Platichthys stellatus), smelt (Osmerus mordax), sculpins (Cottus spp., Myoxocephalus quadricornis
), other species of fish, and shrimp (Pandalus spp.).
4; see below), sculpins (Cottus spp., Myoxocephalus quadricornis
) were found in their stomachs.
Arctic cod (Boreogadus saida), fourhorn sculpin (Myoxocephalus quadricornis
), and arctic flounder (Liopsetta glacialis) are the most abundant marine species.
We analyzed abundance indices, as logetransformed catch-per-unit-effort (CPUE), of four marine species (arctic cod, Boreogadus saida; fourhorn sculpin, Myoxocephalus quadricornis
; arctic flounder, Pleuronectes glacialis; saffron cod, Eleginus gracilis); two freshwater species (round whitefish, Prosopium cylindraceum; arctic grayling, Thymallus arcticus); and the anadromous rainbow smelt, Osmerus mordax, to determine whether there were increases in the abundances of marine species and declines in anadromous and freshwater species.