Regional Differences in Otolith Morphology of the Deep Slope Red Snapper Etelis carbunculus

1992 ◽  
Vol 49 (4) ◽  
pp. 795-804 ◽  
Author(s):  
M. Kimberly Smith
Keyword(s):  
Growth Rate ◽  
Regional Differences ◽  
Maximum Size ◽  
Dry Weight ◽  
French Polynesia ◽  
Red Snapper ◽  
Fish Length ◽  
Otolith Shape ◽  
The Pacific ◽  
Wide Range

Sagittal otoliths from four populations of the Pacific deep slope red snapper Etelis carbunculus Cuvier were compared using Fourier descriptors and other shape indices, linear proportions, and dry weight. Otoliths from Hawaii, Vanuatu, Fiji and French Polynesia and a small number from the Commonwealth of the Northern Marianas Islands (NMI) were examined. Regional shape and weight characteristics were distinguishable, despite the wide range of individual variation and limited available size range from some regions. Size-specific differences in otolith shape were found for the four regions for which a sufficient sample was available. Otoliths from Hawaii, French Polynesia, and NMI showed a significant shape affinity. Otoliths from Fiji and Vanuatu were similarly shaped and were distinct from those from the other three regions. Interregional otolith shape affinities for the stocks examined parallel similarities in maximum size and growth rate from the literature, suggesting that growth rate may influence otolith shape. Observed trends in otolith weight as a function of fish length support growth-related regional differences in otolith shape.

scholarly journals Ontogenetic and intraspecific variability in otolith shape of anchoveta (Engraulis ringens) used to identify demographic units in the Pacific Southeast off Chile

2019 ◽  
Vol 70 (12) ◽  
pp. 1794 ◽  
Author(s):  
Francisco Cerna ◽  
Juan Carlos Saavedra-Nievas ◽  
Guido Plaza-Pasten ◽  
Edwin Niklitschek ◽  
Beatriz Morales-Nin
Keyword(s):  
Intraspecific Variability ◽  
Additive Models ◽  
Fish Length ◽  
Adult Fish ◽  
Otolith Shape ◽  
Total Percentage ◽  
The Pacific ◽  
Sampling Zone ◽  
Engraulis Ringens ◽  
Fourier Harmonics

The phenotypical variability in otolith shape of anchoveta (Engraulis ringens) was analysed in three zones (I, II and III) from north to south along the Chilean coast, using juvenile and adult fish. Generalised additive models were used to analyse shape indices and canonical discriminant analysis was used to analyse elliptical Fourier harmonics. The form factor and ellipticity indices varied significantly among the three zones, whereas roundness, circularity and rectangularity indices only showed differences between Zones I and III. Fourier reconstructed outlines for five ontogenetic stages suggested important differences among sampling zones, which were larger for sampling Zone III, where, at the same fish length, otoliths were smaller than those sampled in Zones I and II, at least at the pre-recruit stage. Elliptical Fourier descriptors showed significant differences among the three units, with a total percentage of correct classifications for juveniles of 89 and 74% for raw data and cross-validated cases respectively, compared with >85 and ~65% respectively for adult fish. The results support the hypothesis that juveniles and adults of anchoveta have remained segregated throughout their entire, or at least a fraction of, their life cycle, mainly between the extreme northward and southward zones.

Growth rates of the lichen Lobaria oregana as determined from sequential photographs

1977 ◽  
Vol 55 (16) ◽  
pp. 2226-2233 ◽  
Author(s):  
Frederick M. Rhoades
Keyword(s):  
Growth Rate ◽  
Pacific Northwest ◽  
Dry Weight ◽  
Similar Species ◽  
The Pacific ◽  
Lobaria Oregana ◽  
Relationship Of ◽  
Non Destructive ◽  
Epiphyte Community

The foliose lichen Lobaria oregana (Tuck.) Müll. Arg. is an important nitrogen-fixing component of the canopy epiphyte community in old-growth Douglas fir forests of the Pacific Northwest. This paper presents a non-destructive method for estimating the growth rate (grams per year) for L. oregana thalli of different weights.Photographs were made over a 2-year period of six in situ thalli. From a relationship of the photographic thallus area and weight of these and 31 other thalli, the dry weight of each of the six thalli is estimated through time. A growth rate is computed for each thallus and a relationship between growth rate and initial thallus weight is determined. Growth rate (grams per year) = exp (−0.8581 + 0.8444 (loge initial weight (grams))). The maximum radial growth rate of lobes of L. oregana determined from the photographs (9.4 mm/year) is comparable with rates for similar species.

Growth and biomass allocation of Ruppia occidentalis in three lakes, differing in salinity

1985 ◽  
Vol 63 (11) ◽  
pp. 2004-2014 ◽  
Author(s):  
Brian C. Husband ◽  
Michael Hickman
Keyword(s):  
Growth Rate ◽  
Biomass Allocation ◽  
Dry Weight ◽  
Maximum Growth ◽  
Freshwater Lake ◽  
Lake Chemistry ◽  
Shoot Dry Weight ◽  
Wide Range ◽  
Total Dry Weight ◽  
Root:Shoot Ratios

The hypothesis that the growth and distribution of Ruppia occidentalis S. Wats. increases with increasing salinity in Alberta lakes was investigated by comparing populations of Ruppia from three lakes, spanning a wide range of total dissolved solids (0.3–6.2‰). Growth and biomass allocation of individuals were correlated with lake chemistry. Plants from the freshwater lake exhibited characters associated with moderate chemical deficiency, including decreased growth rate, decreased reproductive output, and high root:shoot ratios. The proportion of total dry weight decreased in roots and increased in shoots with salinity but varied little among depths within the lake. Changes in shoot dry weight were the result of vertical growth in the saline lakes but the result of horizontal growth through tiller production in the freshwater lake. Although salinity did not affect the reproductive effort in flowering individuals, the number of flowering individuals in the population increased with salinity. The frequency of occurrence and percentage cover of Ruppia within each lake reflect its respective growth rate and reproduction. The within-lake distributions are characterized by significant interactions between salinity and both depth distribution and substratum type. Saline conditions are required by Ruppia and not merely tolerated for maximum growth and reproduction. Its absence from many freshwater lakes is due most likely to chemical constraints on survival or on the competitive ability of Ruppia.

EFFECTS OF TEMPERATURE ON RATE AND DURATION OF KERNEL DRY MATTER ACCUMULATION OF MAIZE

1988 ◽  
Vol 68 (4) ◽  
pp. 935-940 ◽  
Author(s):  
M. TOLLENAAR ◽  
T. W. BRUULSEMA
Keyword(s):  
Growth Rate ◽  
Zea Mays ◽  
Dry Matter ◽  
Zea Mays L ◽  
Dry Weight ◽  
Controlled Environment ◽  
Dry Matter Accumulation ◽  
Linear Kernel ◽  
Effects Of Temperature ◽  
Kernel Growth

The response of rate and duration of kernel dry matter accumulation to temperatures in the range 10–25 °C was studied for two maize (Zea mays L.) hybrids grown under controlled-environment conditions. Kernel growth rates during the period of linear kernel growth increased linearly with temperature (b = 0.3 mg kernel−1 d−1 °C−1). Kernel dry weight at physiological maturity varied little among temperature treatments because the increase in kernel growth rate with increase in temperature was associated with a decline in the duration of kernel growth proportional to the increase in kernel growth rate.Key words: Zea mays L, period of linear kernel dry matter accumulation, controlled-environment conditions, kernel growth rate

Application of the otolith weight – age relationship for the pilchard, Sardinops sagax neopilchardus

1995 ◽  
Vol 52 (4) ◽  
pp. 657-664 ◽  
Author(s):  
W. J. Fletcher
Keyword(s):  
Maximum Size ◽  
Steady Increase ◽  
Average Weight ◽  
Fish Length ◽  
Natural Mortality ◽  
Length Frequency ◽  
Age Classes ◽  
Frequency Distributions ◽  
Southwestern Australia ◽  
Sardinops Sagax

Adult pilchard (Sardinops sagax neopilchardus) from southwestern Australia held in fish cages for 1 year showed minimal increase in mean length but a steady increase in mean otolith weight (1.61–1.83 mg); this increase (0.22 mg) closely parallels the previously calculated mean difference between adjacent age classes (0.24 mg). Modes in otolith weight frequency distributions of fishery-caught pilchards, previously suggested as corresponding with separate year classes, generally persisted and progressed through subsequent samples. By contrast, fish length frequency distributions of these samples showed no consistent modal progression. The average weight of otoliths for year classes 2–8 were used to calculate growth rates: following sexual maturity, at age 2, males grew to a significantly smaller maximum size than females (L∞ = 162 and 172 mm respectively). The otolith weight – age relationship, validated by following a cohort of unusually low abundance as it moved through the fishery, indicated that recruitment to the fishery generally began at age 2 but was not complete until age 4. These data have been successfully used in forecasting the catch rate of the fishery up to 2 years in advance and providing an estimate of the rate for natural mortality of 0.43.

The Energy-Sources in Ontogenesis

1927 ◽  
Vol 5 (1) ◽  
pp. 27-42
Author(s):  
JOSEPH NEEDHAM
Keyword(s):  
Growth Rate ◽  
Oxygen Consumption ◽  
Building Materials ◽  
Calorific Value ◽  
Dry Weight ◽  
Energy Sources ◽  
Chemical Analyses ◽  
Inorganic Substance ◽  
Absorption Intensity ◽  
Dry Substance

1. The percentage growth-rate curves for carbohydrate and protein in the chick enbryo have been determined and compared with those already in the literature for the percentage growth-rates of the whole embryo, the dry substance, the fat, and the calorific value. 2. The composition of the embryo in gm. per cent, of dry weight has been calculated and an ontogenetic succession of carbohydrate, protein, and fat, has been brought to light. These three cell-constituents are at their highest levels in the embryo at 4, 11 and 20 days of incubation respectively. This may be correlated with the succession of maximum intensities of combustion, which have the same order (about 5,8.5 and about 18 days). 3. By comparing the curves for absorption-intensity with those representing the constitution of the embryo, it has been possible to trace the passage of building-materials from the yolk and white into the embryo and to analyse still further the movements of the fat and carbohydrate fractions. 4. The concentration of the carbohydrate and protein in the water of the embryonic body has been calculated and compared with a curve already in existence for fat. 5. The curve for intensity of absorption of total foodstuff has been calculated from the results of chemical analyses. It agrees as well as can be expected at present with that calculated from the oxygen consumption and the increase of dry substance in the embryo. 6. The ratio Carbohydrate : Protein decreases during development, thus falling into line with the ratios Water : Solid, Inorganic Substance : Organic Substance, and Protein : Fat. Certain speculations arising out of these facts are discussed. 7. There is a relation of simultaneity between the combustion of carbohydrate, protein, and fat, and the part these types of molecule play in the constitution of the whole embryo.

Diet of European freshwater pearl mussels Margaritifera margaritifera (Mollusca: Bivalvia: Unionoida) in small river (Republic of Karelia, Russia)

2021 ◽  
Vol 325 (4) ◽  
pp. 502-515
Author(s):  
S.F. Komulaynen
Keyword(s):  
Algal Species ◽  
Dry Weight ◽  
Lake Ladoga ◽  
Total Biomass ◽  
Margaritifera Margaritifera ◽  
Pearl Mussel ◽  
Organic Detritus ◽  
Unicellular Algae ◽  
Wide Range ◽  
Intestinal Contents

The freshwater pearl mussel Margaritifera margaritifera (Linnaeus,1758) is endangered in Europe and is now listed in the Red Data Book of many countries and regions. The diet of the species in the Syskyänjoki River (a tributary of Lake Ladoga) has been studied. The contents of the intestine generally correspond to the composition of seston, and include organic detritus, filamentous and unicellular algae, fragments of invertebrates and macrophyte tissues mixed with silt and sand. The total biomass of the intestinal contents of varied from 0.8 to 30.6 mg per organism (absolutely dry weight). Margaritifera margaritifera consumes a wide range of particles, from 0.5 μm3 (bacteria and unicellular algae) to 200 000 μm3 (fragments of invertebrates and macrophyte tissues). About 90–95% (by volume) of the intestinal contents was consisted by fine organic detritus. The food composition did not differ significantly for mollusks of different sexes and size. In the intestinal contents, 63 taxa of algae were identified. The number of algal species in the content of one intestine varied from 3 to 17, with their abundance from 250 to 9560 cells per organism. The most abundant and constant in the contents of the intestines are unicellular algae. Diatoms are the most diverse, they make up 50.8% of the total number of species.

Third generation progress in breeding white clover for resistance to root-knot nematode

1996 ◽  
Vol 6 ◽  
pp. 163-166
Author(s):  
J. Van den Bosch ◽  
C.F. Mercer
Keyword(s):  
White Clover ◽  
Trifolium Repens ◽  
Egg Production ◽  
Control Method ◽  
Dry Weight ◽  
Third Generation ◽  
Root Knot Nematode ◽  
Root Dry Weight ◽  
Wide Range ◽  
Meloidogyne Sp

Root-knot nematode (Meloidogyne sp.) reduces growth and nutrition of white clover (Trifolium repens L.) in New Zealand, and breeding resistant cultivars (with low galls per gram of root) is the preferred control method. Resistant and susceptible selections were bred from a wide range of white clover lines for three generations. In the third generation there were significant differences between seed lines from the selections for number of galls, root dry weight, visual growth score and galls/gram of root dry weight. Resistant selections had 43% of the susceptible selections' galls per gram, and 50% of the number of galls. Germplasm showing resistance to Meloidogyne spp. in the USA showed partial resistance to the local Meloidogyne sp. Two resistant and two susceptible genotypes were also compared for nematode egg production; resistant genotypes had a mean of 3,460 eggs/plant, compared to 25,030 for susceptible genotypes. Keywords: breeding, Meloidogyne sp., resistance, rootknot nematode, screening, selection, Trifolium repens, white clover

Parasaissetia nigra. [Distribution map].

1997 ◽  
Author(s):  
Keyword(s):  
Tamil Nadu ◽  
New Caledonia ◽  
Solomon Islands ◽  
French Polynesia ◽  
American Samoa ◽  
Virgin Islands ◽  
Peninsular Malaysia ◽  
Distribution Map ◽  
Brunei Darussalam ◽  
Wide Range

Abstract A new distribution map is provided for Parasaissetia nigra (Nietner) Homoptera: Coccoidea: Coccidae Attacks a wide range of crops, fruit trees and ornamental plants. Information is given on the geographical distribution in EUROPE, Portugal, Azores, Madeira, Spain, Canary Islands, ASIA, Bangladesh, Bhutan, Brunei Darussalam, China, Yunnan, Hong Kong, India, Andaman and Nicobar Islands, Assam, Bihar, Gujarat, Haryana, Himachal Pradesh, Karnataka, Kerala, Maharashtra, Punjab, Tamil Nadu, Tripura, Uttar Pradesh, West Bengal, Indonesia, Java, Sulawesi, Sumatra, Israel, Japan, Ryukyu Archipelago, Lao, Malaysia, Peninsular Malaysia, Sabah, Sarawak, Maldives, Mongolia, Myanmar, Nepal, Pakistan, Philippines, Saudi Arabia, Singapore, Sri Lanka, Taiwan, Thailand, Vietnam, Yemen, AFRICA, Angola, Benin, Burkina Faso, Cameroon, Cape Verde, Chad, Comoros, Congo, Cote d'Ivoire, Egypt, Eritrea, Ghana, Guinea, Kenya, Madagascar, Mauritius, Mozambique, Namibia, Nigeria, Reunion, Sao Tome & Principe, Seychelles, Sierra Leone, South Africa, St Helena, Sudan, Tanzania, Uganda, Zaire, Zambia, Zimbabwe, NORTH AMERICA, Mexico, USA, Alabama, California, Florida, Hawaii, Kansas, Louisiana, Maryland, Missouri, New Mexico, New York, Ohio, Oklahoma, Pennsylvania, Texas, Virginia, CENTRAL AMERICA & CARIBBEAN, Antigua and Barbuda, Barbados, Bermuda, British Virgin Islands, Costa Rica, Cuba, Dominican Republic, El Salvador, Grenada, Guadeloupe, Guatemala, Honduras, Jamaica, Martinique, Nicaragua, Panama, Puerto Rico, St Lucia, St Vincent and Grenadines, Trinidad and Tobago, United States Virgin Islands, SOUTH AMERICA, Argentina, Bolivia, Brazil, Minas Gerais, Rio Grande do Sul, Colombia, Ecuador, Guyana, Peru, Venezuela, OCEANIA, American Samoa, Australia, New South Wales, Northern Territory, Queensland, Victoria, Western Australia, Cocos Islands, Cook Islands, Fed. Stales of Micronesia, Fiji, French Polynesia, Guam, Kiribati, Nauru, New Caledonia, New Zealand, Niue, Norfolk Island, Palau, Papua New Guinea, Samoa, Samoan Islands, Solomon Islands, Tonga, Tuvalu, Vanuatu, Wallis and Futuna Islands.

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