scholarly journals EFFECTS OF SAND BAR GEOMORPHOLOGY AND WATER TEMPERATURE ON LIFE HISTORY OF CLAM IN THE BANJO ESTUARY

2005 ◽  
Vol 49 ◽  
pp. 1357-1362
Author(s):  
Satoquo SEINO ◽  
Makoto HIGASHINO ◽  
Tohru TAKAMI ◽  
Hanae HIRASHIMA ◽  
Yoshiaki NAKASHIGE ◽  
...  
Keyword(s):  
Life History ◽  
Water Temperature ◽  
History Of ◽  
Sand Bar

Observations on Phaeosaccion collinsii in culture

1971 ◽  
Vol 49 (4) ◽  
pp. 563-566 ◽  
Author(s):  
J. McLachlan ◽  
L. C.-M. Chen ◽  
T. Edelstein ◽  
J. S. Craigie
Keyword(s):  
Life History ◽  
Nova Scotia ◽  
Water Temperature ◽  
Spore Germination ◽  
Light Intensities ◽  
History Of ◽  
Single Locality

The life history of Phaeosaccion collinsii Farlow, a species which is known from a single locality in Nova Scotia, has been completed in culture. There was no indication of a sexual phase and zoospores gave rise directly to the tubular thallus. Completion of the life history occurred at 5 °C only. At higher temperatures spores failed to germinate, or growth and differentiation were suppressed. Light intensities exceeding 100 ft-c inhibited spore germination, although growth and differentiation were not similarly affected. In nature mature plants occur sublittorally, and are present only in spring when the water temperature is around 5 °C. Zoospore flagellation is of the typical heterokont type with the flimmer bearing bilateral hairs. On this basis P. collinsii can be placed either in the Chrysophyceae or Phaeophyceae.

Cycles de développement de Skistodiaptomus oregonensis, Tropocyclops prasinus et Cyclops scutifer dans la zone limnétique du lac Cromwell, Saint-Hippolyte, Québec

1982 ◽  
Vol 60 (2) ◽  
pp. 139-151 ◽  
Author(s):  
Michèle Paquette ◽  
Bernadette Pinel-Alloul
Keyword(s):  
Life History ◽  
Life Cycle ◽  
Water Temperature ◽  
Food Availability ◽  
Development Times ◽  
Decisive Importance ◽  
History Of ◽  
Cyclops Scutifer

A study of the life history of the three principal copepods (Skistodiaptomus oregonensis, Tropocyclops prasinus, Cyclops scutifer) in Lake Cromwell, Québec, demonstrated that these species are multivoltine. Skistodiaptomus oregonensis and T. prasinus have analogous life cycle strategies with two cohorts produced annually and active winter diapause as instar CV and adult; however, their reproductive periods are 2 months apart (May and July). Cyclops scutifer has two summer cohorts and a winter cohort without active diapause. The development times of cohorts are strongly related to water temperature but food availability and water oxygenation could also be of decisive importance for the development of summer cohorts.

Effects of climate‐induced water temperature changes on the life history of brachyuran crabs

2019 ◽  
Vol 12 (2) ◽  
pp. 1211-1216 ◽  
Author(s):  
Mohamad N. Azra ◽  
Mohd Amran Aaqillah‐Amr ◽  
Mhd Ikhwanuddin ◽  
Hongyu Ma ◽  
Khor Waiho ◽  
...  
Keyword(s):  
Life History ◽  
Water Temperature ◽  
Temperature Changes ◽  
History Of ◽  
Brachyuran Crabs

Quelques aspects de la biologie du grand corégone Coregonus clupeaformis des lacs Hélène et Nathalie, territoire de la Baie James

1978 ◽  
Vol 56 (6) ◽  
pp. 1402-1411 ◽  
Author(s):  
Pierre Dumont ◽  
Réjean Fortin
Keyword(s):  
Life History ◽  
Population Density ◽  
Water Temperature ◽  
Growth Rates ◽  
Aquatic Insects ◽  
Coregonus Clupeaformis ◽  
Main Food ◽  
Food Items ◽  
Relative Fecundity ◽  
History Of

The life history of lake whitefish in lakes Nathalie (53°27′ N; 77°27′ W) and Hélène (53°27′ N; 77°31′W) was studied between June 1974 and November 1975. The age of 840 specimens was determined from the scales. Growth rates are very slow, compared only with those of dwarf whitefish of certain North American lakes. Food varies with the length of the fish and with the season of the year. Main food items are aquatic insects (larvae and adults), mollusks, and small fishes. In 1975, spawning occurred in late October (water temperature: 4 °C), at depths of 2–4 m; substrates utilized were sand, gravel, and boulders. Spawning lasted less than 2 weeks. Males mature at 390 mm (age 8) and females at 400 mm (age 9). Lake Nathalie whitefish (N = 41) show a low relative fecundity (17 980 eggs/kg). In the fall of 1974, the population density of Lake Nathalie whitefish 350 mm and longer was estimated at 839 individuals (0.72 kg/ha).

scholarly journals Life history and instream distribution of the endangered estuarine goby Acanthogobius insularis from Okinawa-jima Island, Japan

2018 ◽  
Vol 99 (1) ◽  
pp. 229-237 ◽  
Author(s):  
Taiga Kunishima ◽  
Risa Iwamoto ◽  
Midori Iida ◽  
Katsunori Tachihara
Keyword(s):  
Life History ◽  
Water Temperature ◽  
Coastal Waters ◽  
Gonadosomatic Index ◽  
Conservation Status ◽  
Habitat Diversity ◽  
Reproductive Season ◽  
Basic Knowledge ◽  
Species Analysis ◽  
History Of

The genus Acanthogobius of gobiioid fish has been reported for six species from East Asia, and inhabits estuarine and coastal waters. Within this genus, Acanthogobius insularis is an endangered and endemic goby in the Amami-oshima and Okinawa-jima Islands, southern Japan, and its range is restricted to the lowermost course of a few river basins. Basic knowledge on this species is scarce in spite of its vulnerable conservation status. The purpose of this study was to elucidate the life history of A. insularis. Monthly sampling was conducted at five stations in the Taiho River, Okinawa-jima Island, from November 2014 to November 2015. Monthly standard length (SL) distributions were unimodal except in April during the recruiting period, suggesting that A. insularis is an annual species. Analysis of the gonadosomatic index and histological observations of the ovaries revealed that this species spawns from January to May. The beginning of the spawning season seems to be related to a decline in water temperature in December. Growth rates appeared to be lower from April to December and higher in winter months. From monthly collections, A. insularis was found to move upstream with growth, and gather at spawning grounds during the reproductive season. Acanthogobius insularis might be threatened by increasing water temperature due to climate change, since low water temperatures appear to be important for their reproduction and growth. Moreover, habitat diversity, from tidal flats for recruiting grounds to upstream sites with cobbles for spawning, is needed to complete their life cycle, and should be conserved.

Experimental life history of Echinostoma cinetorchis

1990 ◽  
Vol 28 (1) ◽  
pp. 39 ◽  
Author(s):  
S H Lee ◽  
J Y Chai ◽  
S T Hong ◽  
W M Sohn
Keyword(s):  
Life History ◽  
History Of
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