摘要:

From 1961 to 1965, 14,137 sea-bed drifters were released over the Continental Shelf from the Gulf of St. Lawrence to the Gulf of Maine–Bay of Fundy to investigate the residual drift along the bottom. A total of 2772 drifters were recovered either from the sea floor or along the shores. The recovery pattern, in time and in space, is studied for various portions of the Shelf.The inferred residual bottom drift is shown in a series of three charts. The estimated rate of drift lies between 0.2 and 0.7 nautical mile/day. The continuity of bottom drift over large areas is indicated. The relationship of surface to bottom drift is studied. Areas of convergence and upwelling are emphasized. No seasonal variations in the direction of bottom drift and in the speed have as yet been detected.

ISSN:0706-652X    

DOI:10.1139/f67-154

出版商:NRC Research Press    

年代:1967

数据来源: NRC

摘要:

Primary production measurements (C14) and phytoplankton counts were made in an arctic lake between June and September 1963. Annual carbon fixation was estimated at 8.5 g/m2(4.0 g/m3), of which approximately 22% occurred under the ice. Phytoplankton numbers varied between 2.4 and 24.1 × 106cells/liter. The proportion of small nannoplankton (≤ 10 μ) fluctuated between 51.0 and 100% and averaged 84.5%. Few of the organisms were larger than 20 μ. The highest numbers of phytoplankton were found near the lake bottom when between 1.20 and 1.75 m of ice covered the lake. Some evidence is provided suggesting that the organisms near the bottom lived heterotrophically when the lake was ice-covered. Insufficient light rather than nutrient deficiencies appears to have limited autotrophic carbon fixation under the ice.

ISSN:0706-652X    

DOI:10.1139/f67-155

出版商:NRC Research Press    

年代:1967

数据来源: NRC

摘要:

TheCalanusexpeditions in Hudson Bay in 1953, 1954, and 1958–61 collected 2240 specimens comprising 13 species of decapod Crustacea. A review of previous collections from this bay indicates that all but one of these species (Eualus macilentus) has been reported from the bay but any one expedition has taken at most only 10 species. The present collections took greater numbers of specimens off the northwest coast than elsewhere but more species off the Belcher Islands where a greater number of hauls were made compared with other areas. The greatest number ofE.macilentuswas taken in Richmond Gulf.Eualus macilentusappeared to be more cold-adapted than the other species, seven of which showed environmental stress by their apparently low reproductive potential. Most species in the bay, including the only brachyuran crab (Hyas coarctalus), were smaller than their counterparts from adjacent arctic and subarctic areas. As in the same species from other areas in the northwest Atlantic, selective feeding was apparent on detritus and phytobenthos in eight species, on crustaceans in six, on polychaetes in three, and on foraminiferans in two species. The origin of the decapod crustacean fauna in Hudson Bay is suggested to have been from the Pacific but by way of the northern Atlantic after the last great Ice Age.

ISSN:0706-652X    

DOI:10.1139/f67-156

出版商:NRC Research Press    

年代:1967

数据来源: NRC

摘要:

Evidence suggests thatMembraniporella corbiculaO'Donoghue and O'Donoghue, 1923, described from Vancouver Island, belongs toCribrilina annulata(Fabricius), a common northern marine cheilostome. The terminology as applied to female individuals in the Cheilostomata is defined here to include three principal types: ovicelled zooids, gonoecia, and gonozooids. The occurrence of dimorphic female zooids inC.annulatais documented, comprising ovicelled zooids as well as accessory dwarf zooids with ovicells (gonozooids). The gonozooids are usually recumbent on the frontal shields of the underlying autozooids and are budded off from frontal dietellae located on the proximal gymnocysts. It is suggested that the term "dietella," formerly restricted to a pore chamber marginally positioned near the base of the zooecial wall, be emended to include frontal and basal chambers as well. The presence of adventitious gonozooids in this species constitutes an important new addition to the range of polymorphism in the Cribrilinidae. No similar instance of dimorphic female individuals occurring simultaneously are recorded for the Cheilostomata. An increase in larval productivity may result from frontal budding of gonozooids.

ISSN:0706-652X    

DOI:10.1139/f67-157

出版商:NRC Research Press    

年代:1967

数据来源: NRC

摘要:

A survey was made of the parasites of freshwater game fishes in Insular Newfoundland. A total of 304 fish from five species (Salvelinus fontinalis,Salmo salar(grilse, landlocked, parr, smolt),Salmo gairdneri,Salmo trutta, andCoregonus clupeaformis) was examined from 43 sampling stations covering the main watersheds of the island. Twenty-six parasitic species are recorded. Two new species,Phyllodistomum limnosaandSalmincola exsanguinata, are described. Descriptions are given and the systematic positions of the following discussed:Trichophrya piscium,Crepidostomum farionis,Apophallus brevis(metacercariae),Dibothriocephalussp.,Echinorhynchus lateralis,Metabronema salvelini,Philonema agubernaculum,Salmincola salmonea, andArgulus canadensis. A host–parasite list with percentage infections is given for all species of fish and a table showing the distribution between river and lake fish over the island as a whole is given for the commoner parasites ofS.fontinalis. Distribution and host specificity are discussed.

ISSN:0706-652X    

DOI:10.1139/f67-158

出版商:NRC Research Press    

年代:1967

数据来源: NRC

摘要:

A new scorpaenid species,Sebastodes reedi(yellowmouth rockfish), is described by conventional and biochemical methods (starch gel electrophoresis of proteins from hemoglobin and muscle).Sebastodes reediresemblesS.alutus,S.crameri, andS.proriger, but is readily separated from these morphologically and biochemically. It differs from all of these in having yellow and black blotches in the mouth, and individually in respect to numbers of scales, gill rakers, and spines, and electrophoretic patterns.Sebastodes reediappears to exist in two variant forms based on hemoglobin electropherograms, although no corresponding morphometric or meristic differences have been detected.Present geographical range extends from Cape Blanco, Oregon, to Sitka, Alaska, and the bathymetric range, 77–200 fath (141–366 m). Substantial aggregations of this species have been discovered in three areas off British Columbia, all of which are virtually unfishable with conventional groundfish trawls. Otolith readings suggest an age range of 5–34 years for specimens 25–53 cm in fork length. No mature fish were less than 31–33 cm long or 9 years old.

ISSN:0706-652X    

DOI:10.1139/f67-159

出版商:NRC Research Press    

年代:1967

数据来源: NRC

摘要:

Anadromous Skeena River sockeye mature and spawn mainly at ages 42and 52. Lesser numbers of 32, 53, and 63and 64fish, and non-anadromous kokanee, may spawn in the same stream. Mate selection by the different types was studied by observing salmon of known length and using the relationship found between length and age in dead, spawned fish.Fish of all lengths tended to mate with similar sized fish. Small males were less successful in holding mates than were large males because they could not successfully defend redds against larger intruders. Small males spent more time alone than large ones and frequently lay in groups behind mating pairs. The term "satellite male" is used in describing the behaviour. Small females mated with large males but spent more time alone than did large females.The genetic implications of mating within age-groups are considered.

ISSN:0706-652X    

DOI:10.1139/f67-160

出版商:NRC Research Press    

年代:1967

数据来源: NRC

摘要:

not available

ISSN:0706-652X    

DOI:10.1139/f67-161

出版商:NRC Research Press    

年代:1967

数据来源: NRC

摘要:

not available

ISSN:0706-652X    

DOI:10.1139/f67-162

出版商:NRC Research Press    

年代:1967

数据来源: NRC

摘要:

not available

ISSN:0706-652X    

DOI:10.1139/f67-163

出版商:NRC Research Press    

年代:1967

数据来源: NRC