Oxygen uptake in a barnacle: scaling to body size from nauplius to adult

1982 ◽  
Vol 60 (6) ◽  
pp. 1231-1235 ◽  
Author(s):  
D. D. Jorgensen ◽  
W. B. Vernberg
Keyword(s):  
Body Weight ◽  
Life Cycle ◽  
Oxygen Uptake ◽  
Naupliar Stage ◽  
Life Cycle Stages ◽  
Stage 1 ◽  
Balanus Eburneus ◽  
Adult Mass ◽  
The Relationship ◽  
Large Adult

We measured the oxygen uptake of the barnacle Balanus eburneus Gould during the following stages of its life cycle: (1) naupliar stages 1, 4 and 6; (2) cyprid; (3) postmetamorphosis adult (pinhead); and (4) large adult. Mass specific oxygen uptake [Formula: see text] increased by 60% during development from naupliar stage 1 to stage 6. An eightfold drop in [Formula: see text] occurred with the molt from stage 6 to cyprid. [Formula: see text] increased by fourfold after metamorphosis of the cyprid into the pinhead, the smallest adult. The slopes of the regression lines describing the relationship between nonmass specific O2 uptake and dry body weight (Wb) were (1) 1.27 for nauplii, (2) 0.87 for large adults, and (3) 0.75 for all life cycle stages studied except cyprids.

scholarly journals Cnidome and Morphological Features of Pelagia noctiluca (Cnidaria: Scyphozoa) Throughout the Different Life Cycle Stages

2021 ◽  
Vol 8 ◽  
Author(s):  
Ainara Ballesteros ◽  
Carina Östman ◽  
Andreu Santín ◽  
Macarena Marambio ◽  
Mridvika Narda ◽  
...  
Keyword(s):  
Life Cycle ◽  
Developmental Stages ◽  
Later Life ◽  
Life Stages ◽  
Accurate Identification ◽  
Early Stages ◽  
Pelagia Noctiluca ◽  
Life Cycle Stages ◽  
Advanced Stages ◽  
Stage 1

Pelagia noctiluca is considered the most important jellyfish in the Mediterranean Sea, due to its abundance and the severity of its stings. Despite its importance in marine ecosystems and the health problems caused by its massive arrival in coastal areas, little is known about its early life stages and its cnidome has never been described. This study of the morphological and anatomical features throughout the life cycle identifies four early stages: two ephyra and two metaephyra stages. Ephyra stage 1, newly developed from a planula, has no velar canals, gastric filaments or nematocyst batteries. Ephyra stage 2, has velar canals, a cruciform-shaped manubrium and gastric filaments. Metaephyra stage 3 has eight tentacle buds and nematocyst clusters for the first time. Lastly, in metaephyra stage 4, the eight primary tentacles grow nearly simultaneously, with no secondary tentacles. Complete nematocyst battery patterns gradually develop throughout the later life stages. Four nematocyst types are identified: a-isorhiza, A-isorhiza, O-isorhiza and eurytele. Of these, a-isorhiza and eurytele are the most important throughout the entire life cycle, while A-isorhiza and O-isorhiza have a more important role in advanced stages. All nematocysts show a positive correlation between increasing capsule volumes and increasing body diameter of the ephyrae, metaephyrae, young medusae and adult medusae. In the early stages, the volumes of euryteles in the gastric filaments are larger than those in the exumbrella, indicating that the capsule volume is critical in the absence of marginal tentacles, specialized for feeding. This study provides updated information, the most extensive description to date, including high-resolution photographs and schematic drawings of all the developmental stages in the life cycle of P. noctiluca. Additionally, the first cnidome characterization is provided for each stage to facilitate accurate identification of this species when collected in the water column, and to raise awareness of the potential for human envenomation.

The relationship between cirral activity and oxygen uptake in Balanus balanoides

1965 ◽  
Vol 45 (2) ◽  
pp. 387-403 ◽  
Author(s):  
R. C. Newell ◽  
H. R. Northcroft
Keyword(s):  
Body Weight ◽  
Oxygen Consumption ◽  
Oxygen Uptake ◽  
Mantle Cavity ◽  
The Body ◽  
Effect Of Temperature ◽  
Zero Rate ◽  
Rate Of Oxygen Consumption ◽  
The Relationship ◽  
Balanus Balanoides

The rate of cirral beat of Balanus balanoides is related to the logarithm of the body weight as an exponential function. In any one animal, there is little effect of temperature on cirral activity between 7·5° and 10° C. Between 10° and 20° C, however, there is a rapid increase in cirral beat with temperature followed by a fall at temperatures above 20° C.Balanus balanoides exhibits a fast, medium and zero rate of oxygen consumption. These rates of oxygen consumption correspond with (a) normal cirral beating, (b) ‘testing’ activity with no cirral movement, and (c) with the closure of the mantle cavity. Both of the possible levels of oxygen uptake are related to the logarithm of the body weight in a logarithmic fashion over the temperature range 7·5°–22·5° C. Temperature affects the two rates of oxygen consumption differently. In the slower rate (rate B) there is an increase in the rate of oxygen consumption between 7·5° and 14° C but there is no significant increase in the rate of oxygen consumption between 14° and 22·5 C°.

The dividend signaling hypothesis and the corporate life cycle

2020 ◽  
Vol 46 (12) ◽  
pp. 1569-1587
Author(s):  
Narcisa Meza ◽  
Anibal Báez ◽  
Javier Rodriguez ◽  
Wilfredo Toledo
Keyword(s):  
Life Cycle ◽  
Growth Stages ◽  
Content Type ◽  
Future Earnings ◽  
Life Cycle Stages ◽  
Dividend Signaling ◽  
Corporate Life Cycle ◽  
Firm’S Life Cycle ◽  
Signaling Hypothesis ◽  
The Relationship

PurposeThis paper aims to examine the relationship between the dividend signaling hypothesis and a firm's life cycle.Design/methodology/approachThe authors use Dickinson's (2011) methodology to develop a proxy for the firm's stages in its life cycle and to examine the relationship between dividends and future earnings following a nonlinear setting.FindingsUsing a sample of US firms during the 2000–2014 period, the authors find that the signaling hypothesis can be dependent on firm-specific characteristics, such as life cycle stages. The authors report that the relationship between dividend changes and subsequent earnings changes is different for different life stages. They also find that changes in the amount of the dividend provide some information about future earnings, especially during the early (introductory and growth) stages. These results are consistent with the use of earnings or return on assets as the dependent variables in models of earnings expectations.Originality/valueThe authors believe that this is the first time that the dividend signaling hypothesis has been linked to the life cycle of the firm.

Studies on the relationship between Eimeria acervulina and Eimeria mivati

Parasitology ◽  
1973 ◽  
Vol 67 (2) ◽  
pp. 143-155 ◽  
Author(s):  
P. L. Long
Keyword(s):  
Life Cycle ◽  
Chorioallantoic Membrane ◽  
Distinct Species ◽  
Cross Protection ◽  
Eimeria Acervulina ◽  
Size And Shape ◽  
Life Cycle Stages ◽  
Shape Characteristics ◽  
High Degree ◽  
The Relationship

Two strains each of Eimeria acervulina and Eimeria mivati were examined for their ability to develop in the chorioallantoic membrane (CAM) of chicken embryos and the caeca of chickens. It was found that between 100 and 1000 times more sporozoites of E. acervulina were needed to produce infections in the caeca and the embryo CAM respectively. The reproduction of both species in infections of chickens was similar and a high degree of cross-protection occurred.It was found that oocysts of E. mivati differed in size and shape depending upon whether they were produced from infections of embryos or chickens. When maintained by passage in chickens they assumed size and shape characteristics of E. acervulina.These findings, with the known similarity of the life-cycle stages, pathogenicity and pathology, indicate that E. mivati is not sufficiently different from E. acervulina to be a distinct species. It is suggested that it is best referred to as E. acervulina var. mivati.

THE RELATIONSHIP BETWEEN BODY WEIGHT AND SUBMAXIMAL OXYGEN UPTAKE IN FEMALE COLLEGIATE BASKETBALL PLAYERS

1992 ◽  
Vol 24 (Supplement) ◽  
pp. S100
Author(s):  
J. L. Lettunich ◽  
K. Burrhus ◽  
K. R. Turley ◽  
C. M. Mier ◽  
P. J. McBride ◽  
...  
Keyword(s):  
Body Weight ◽  
Oxygen Uptake ◽  
Basketball Players ◽  
Collegiate Basketball ◽  
The Relationship

Oxygen Uptake by Zebrafish (Brachydanio rerio) of Different Ages in Relation to Zinc Sulphate Resistance

1967 ◽  
Vol 24 (6) ◽  
pp. 1253-1267 ◽  
Author(s):  
J. F. Skidmore
Keyword(s):  
Life Cycle ◽  
Oxygen Uptake ◽  
Survival Time ◽  
Zinc Sulphate ◽  
Dry Weight ◽  
Brachydanio Rerio ◽  
Different Ages ◽  
The Relationship

The routine rate of oxygen uptake, of 12 groups of zebrafish aged 0 to 100 days, was measured in well-aerated water free of zinc. The relationship between the rate of oxygen uptake (X) and survival time (T) in four toxic solutions of zinc was[Formula: see text]throughout the life cycle, where Ts, Xs, and K were constants. T was also related to the dry weight of the fish (W) in fish aged 5 days or over.[Formula: see text]

scholarly journals PERSPEKTIF SIKLUS HIDUP PERUSAHAAN DALAM HUBUNGAN ANTARA INVENTORI DAN KINERJA FINANSIAL

2019 ◽  
Vol 20 (1) ◽  
pp. 40
Author(s):  
Ferry Setiawan ◽  
Nofrisel Nofrisel
Keyword(s):  
Life Cycle ◽  
Financial Performance ◽  
Inventory Management ◽  
Growth Stage ◽  
Organizational Life ◽  
Organizational Life Cycle ◽  
Life Cycle Stages ◽  
And Cluster Analysis ◽  
The Relationship ◽  
Organization Life Cycle

Research regarding the relationship between inventory management and financial performanceis so far inconclusive: some found it to be positive, others found it to be negative. One ofthe many factors that influence the variance, the organizational life cycle, will be exploredin this research. Organizational life cycle might influence the relationship between inventorymanagement and financial perfomance due to the different strategies and designs pursuedby the organizations along each of their life cycle stages. This study use a sample set of 33manufacturing companies listed in BEI, with 7 years observation period. A regression analysisis performed with dummy variables of organizational life cycle, resulting from a cluster analysiswith k-mean method. Regression analysis and cluster analysis are all done with Stata. Theresult shows that the relationship between inventory and financial performance is positive inthe early growth stage of organization life cycle and turns to negative at late growth stage. Therelationship is inconclusive at the conception and stability stage of organizational life cycle.Therefore, we can conclude that in making decisions about inventory, firms should considerwhat stage of organizational life cycle they are currently in so that the decisions made canimpact the financial performance positively.Keywords: Organizational Life Cycle, Financial Performance, Inventory Management

scholarly journals Toward a better comprehension of external environment factors and life cycle stages importance on SME failure in Brazil

2021 ◽  
pp. 25-39
Author(s):  
Edmundo Escrivão Filho ◽  
Alexandre Farias Albuquerque ◽  
Marcelo Seido Nagano ◽  
Luiz Philippsen Jr
Keyword(s):  
Life Cycle ◽  
External Environment ◽  
Life Cycle Stage ◽  
Exploratory Research ◽  
Mortality Factors ◽  
Comprehensive Description ◽  
Life Cycle Stages ◽  
Analysis Technique ◽  
The Relationship ◽  
Organization Life Cycle

Although importance of small and medium-sized enterprises (SME) is relatively well established in the literature, little research exists on life cycle stage at the time of SME failure or closure. This exploratory research builds a comprehensive description of SME mortality factors related to the external environment to analyse the changing importance of these factors throughout the SME’s organization life cycle stages (OLC). Seven case studies are used to develop a more complete understanding of the relationship between external environment and mortality factors. Data were collected through interviews and analysed based on inductive content analysis technique. The results indicate that failure SME did not adequately assimilate nine main factors: non-payment of the clients, competition with big business, seasonality of sells during the year, minimum amount of purchase required by suppliers, tributary load, government economic plans, national economy crisis, and headquarter/office robbery and asymmetric relationship with the franchisor. Regarding SME’s OLC, environmental factors’ relevance changed throughout the SME life cycle. Additional result suggests that exists more stages than discussed in the literature, reported by sample SME owner-managers studied.

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