scholarly journals Lady Crabs, Ovalipes ocellatus, in the Gulf of Maine

2006 ◽  
Vol 120 (1) ◽  
pp. 106
Author(s):  
J. C. A. Burchsted ◽  
Fred Burchsted
Keyword(s):  
Gulf Of Maine ◽  
Cape Cod ◽  
Massachusetts Bay ◽  
North Shore ◽  
The North ◽  
Cape Cod Bay ◽  
Continuous Range ◽  
Local Habitat

The Lady Crab (Ovalipes ocellatus), mainly found south of Cape Cod and in the southern Gulf of St. Lawrence, is reported from an ocean beach on the north shore of Massachusetts Bay (42°28'60"N, 70°46'20"W) in the Gulf of Maine. All previously known Gulf of Maine populations north of Cape Cod Bay are estuarine and thought to be relicts of a continuous range during the Hypsithermal. The population reported here is likely a recent local habitat expansion.

Surface foraging behaviour of the North Atlantic right whale, Eubalaena glacialis, and associated zooplankton characteristics

1990 ◽  
Vol 68 (10) ◽  
pp. 2214-2220 ◽  
Author(s):  
Charles A. Mayo ◽  
Marilyn K. Marx
Keyword(s):  
Foraging Behaviour ◽  
Rate Of Change ◽  
Calanus Finmarchicus ◽  
Cape Cod ◽  
North Atlantic Right Whale ◽  
Right Whale ◽  
The North ◽  
Cape Cod Bay ◽  
Zooplankton Density ◽  
Right Whales

Right whales in Cape Cod Bay, Massachusetts, were studied to determine the relationship between their surface feeding behaviour and the density and composition of their planktonic prey. The swimming path characteristics of whales feeding, socializing, and travelling were compared. Zooplankton samples collected in the feeding path were contrasted with those from areas where whales were not present. Surface prey patches where right whales fed were dominated by Calanus finmarchicus (21 samples), Pseudocalanus minutus (n = 13), Centropages sp. (n = 3), and larval barnacles (n = 2). The zooplankton density in the feeding path of the whales tested significantly higher (Mann–Whitney U-test, P < 0.001) than at stations where whales were not present (mean total densities were 6.54 × 103 (SE = 1.03 × 103) and 0.87 × 103 (SE = 0.19 × 103) organisms/m3, respectively). Feeding was rarely observed in locations where the total zooplankton density was less than 1000 organisms/m3. The rate of change of direction in the feeding path (mean 19.3°/10 m of path) was significantly higher (P < 0.001) than for paths of whales travelling (mean 5.3°/10 m of path), reflecting area-restricted foraging behaviour.

Humpback Whales (Megaptera novaeangliae) Fatally Poisoned by Dinoflagellate Toxin

1989 ◽  
Vol 46 (11) ◽  
pp. 1895-1898 ◽  
Author(s):  
Joseph R. Geraci ◽  
Donald M. Anderson ◽  
Ralph J. Timperi ◽  
David J. St. Aubin ◽  
Gregory A. Early ◽  
...  
Keyword(s):  
New England ◽  
Marine Mammals ◽  
Gulf Of Maine ◽  
Paralytic Shellfish Poisoning ◽  
Megaptera Novaeangliae ◽  
Humpback Whales ◽  
Cape Cod ◽  
Shellfish Poisoning ◽  
Atlantic Mackerel ◽  
Cape Cod Bay

During a 5–wk period beginning in late November, 1987, 14 humpback whales, Megaptera novaeangliae, died in Cape Cod Bay after eating Atlantic mackerel, Scomber scombrus, containing saxitoxin (STX), a dinoflagellate neurotoxin responsible for paralytic shellfish poisoning in humans. We propose a line of evidence to explain how whales, by virtue of their diving adaptations, may be particularly vulnerable to this systemic neurotoxin. Absence of STX in New England waters and shellfish during the episode suggests that the mackerel, representing the northern stock which spawns in the Gulf of St. Lawrence, accumulated the toxin there and delivered it to the Gulf of Maine and Cape Cod Bay in the fall of 1987. These findings challenge common perceptions of the manner in which planktonic toxins move through the food chain, and offer new insights into natural mortality and standings of marine mammals. It seems appropriate to search for STX and other phytotoxins when investigating marine mammal mortalities.

On Riccia marginata and related species (Ricciaceae, Marchantiophyta)

2012 ◽  
Vol 46 ◽  
pp. 298-305 ◽  
Author(s):  
A. D. Potemkin ◽  
T. Ahti
Keyword(s):  
Related Species ◽  
Lake Ladoga ◽  
Leningrad Region ◽  
Sem Images ◽  
North Shore ◽  
The North ◽  
Molecular Studies ◽  
The Future ◽  
The Town

Riccia marginata Lindb. was described by S. O. Lindberg (1877) from the outskirts of the town of Sortavala near the north shore of Lake Ladoga, Republic of Karelia, Russia. The species has been forgotten in most recent liverwort accounts of Europe, including Russia. Lectotypification of R. marginata is provided. R. marginata shares most characters with R. beyrichiana Hampe ex Lehm. It differs from “typical” plants of R. beyrichiana in having smaller spores, with ± distinctly finely areolate to roughly papillose proximal surfaces and a narrower and shorter thallus, as well as in scarcity or absence of marginal hairs. It may represent continental populations of the suboceanic-submediterranean R. beyrichiana, known in Russia from the Leningrad Region and Karelia only. The variability of spore surfaces in R. beyrichiana is discussed and illustrated by SEM images. A comparison with the spores of R. bifurca Hoffm. is provided. The question how distinct R. marginata is from R. beyrichiana needs to be clarified by molecular studies in the future, when adequate material is available. R. marginata is for the time being, provisionally, included in R. beyrichiana.

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