Showing papers in "Journal of Experimental Marine Biology and Ecology in 1973"

TL;DR: The phosphosulphovanillin method, previously used only for blood serum samples, is recommended for estimation of ‘total’ lipids in the tissue of marine animals, based on using a cholesterol standard which has previously been related to gravimetric values obtained on blood sera.

TL;DR: A general hypothesis is put forward in which it is proposed that the fish are able to select and maintain their position at a particular depth throughout a tidal cycle thereby being guided up and down the beach.

TL;DR: Samples of phytoplankton populations from the Trondheimsfjord, collected in 1970 and the first five months of 1971, have been analysed for carbohydrate, protein, lipid, and phosphorus.

TL;DR: Study of the uptake and loss of 65Zn and 54Mn by plaice, Pleuronectes platessa L., have shown that direct accumulation from water plays only a minor role relative to food in the metabolism of these metals.

TL;DR: Detailed faunal data relating to a sublittoral survey of kelp holdfasts in northeast Britain are presented and a primary correlation between the local composition of the holdfast fauna and turbidity is indicated.

TL;DR: Four annual reproductive cycles were followed in the echinoid, Strongylocentrotus purpuratus (Stimpson), at three places on the central Oregon coast near 44°45′N lat.

TL;DR: The unpredictable development of diatom blooms in the autumn seems to follow peaks in the discharge unless prevented by too low salinity and poor incident light, and on two occasions trace metals seemed to be the most limiting.

TL;DR: Lack of extreme change in the composition of the pyloric caeca with size through the year suggests that energy deposition in the organ is primarily by change in cell number and not by cell size, and that energy production came about through cell destruction rather than preferential utilization of cellular nutrient stores.

TL;DR: The results of experiments on substratum preference with adequately nourished juveniles suggest that the particle size of the sediment is more important than the food in the substratum in determining the distribution; the apparent preference of juveniles for a fine sandy substratum both in the laboratory and in the natural habitat may be attributed to the minimum threshold velocity of the sand particles.

TL;DR: The data suggest that the Dicathais found at the sites studied in this investigation are all part of the same ‘population’, the shell shape and shell characteristics of the adult populations being determined both by selection and phenotypic expressions caused by the selective force of the habitat at each site.

TL;DR: The hypothesis is developed that the high ratio of crustose corallines to corals at Waikiki may be partly due to increases in eutrophication, and experimental evidence shows that P. onkodes can withstand intense illumination and is thereby unique among Hawaiian crustose Corallinaceae.

TL;DR: Donax vittatus shows no evidence of complete acclimation to different temperatures; the metabolic rate is higher at higher temperatures and the increased rate is maintained even during periods of starvation by rapid utilization of reserves.

TL;DR: Great differences between three major habitats in concentrations of nutrients, standing crops of phyto- and Zooplankton, average temperatures and average salinities have been demonstrated and there appear to be some qualitative differences in fundamental ecological processes between these habitats.

TL;DR: Both seasonal changes in size and frequency distributions of stages of the oocytes indicate that in the intertidal populations studied, there is an abrupt increase in the growth rate of oocytes during October, accompanied by an increased in the rate at which oogonia become primary oocytes.

TL;DR: A study of the sublittoral kelp fauna in northeast Britain is described and the degree of holdfast branching is shown to be independent of age and to influence significantly (along with water movement external to the holdfast) the degreeof holdfast silting.

TL;DR: By means of gradual adaptation of the marine Bangia fuscopurpurea (Dillw.) Lyngb.

TL;DR: It is concluded that the proportion of chl a to T-chl a and the occurrence of chlorophyll derivatives in phytoplankton samples can give valuable information on the stage of development of the algal populations involved.

TL;DR: It is concluded that there are few clear-cut general differences between littoral and sublittoral species in their behavioural and physiological adaptations to hypoxia; the main distinguishing feature of littoran-adapted species is their ability to control air-gaping.

TL;DR: It is concluded that the responses of these larvae to gravity and hydrostatic pressure together with their characteristic passive sinking rates provide a mechanism for depth regulation in the absence of light that varies during ontogeny.

TL;DR: The rates (μg-at/l/g C animal) of regeneration of nutrients, especially total inorganic nitrogen, along with reported high biodeposition rates of bivalves suggest that multi-species aquaculture systems would be more efficient and productive than one-species systems.

TL;DR: L'auteur etudie l'effet des transformations logp(x+l),p variant, sur the liaison stochastique moyenne-variance, en echelle log-log, par une courbe dont the pente passe progressivement de la valeur 1 pour les petites moyennes, a la vALEur 2 pour les plus grandes.

TL;DR: It is found that non-photochemical metabolic processes related to photosynthesis such as diurnal variations, maximal photosynthesis rates, and dark oxygen uptake were quite different, and so these are the more significant factors in production and ecological distribution of diatoms, dinoflagellates, and coccolithophores.

TL;DR: Although the effect of limb loss and regeneration on the growth rate of C. pagurus has not been quantitatively determined, it is unlikely to be a factor greatly affecting the determination of growth for a yield assessment.

TL;DR: The ‘broken-up’ nature of the breakwaters with moderate wave action is the probable reason for the occurrence of large fish populations and hence the presence largely of grazing-tolerant algae.

TL;DR: Differences in response of feeding and biodeposition rates are important to the knowledge of food chain dynamics and may be used to optimize aquaculture systems.

TL;DR: Differences in values of the constant ( a ) in the regression equation suggest that there is some acclimation to temperature, resulting in rotation of the rate/temperature curve counterclockwise for warm-acclimated animals, and a reduction of Q 10 in cold-acClimated animals.

TL;DR: Biological half-times of the exchange with water have been calculated for many organs, although the rate of accumulation for some tissues could only be expressed as a linear function; however, for both radionuclides the direct accumulation from water resulted in concentration factors of less than 1 % of the values inferred from the stable element data.

TL;DR: Shell shape, as expressed in terms of log weight/log length, changes progressively as Thais lamellosa Gmelin grows, but the decrease is relatively rapid at localities with low food supply and correspondingly low growth rates.

TL;DR: A new numerical model is defined for the partition of three-dimensional data based on the analysis of variance, and is shown to be equivalent to an unstandardized Euclidean distance preceded by a specified form of standardization.

TL;DR: Results reported in the literature suggest that feeding behaviour in bivalve molluscs and some ascidians shows a similar sensitivity to some environmental conditions.