The trematodes of groupers (Serranidae: Epinephelinae): knowledge, nature and evolution

Parasitology ◽  
2002 ◽  
Vol 124 (7) ◽  
pp. 23-42 ◽  
Author(s):  
T. H. CRIBB ◽  
R. A. BRAY ◽  
T. WRIGHT ◽  
S. PICHELIN
Keyword(s):  
Marine Fishes ◽  
Major Determinant ◽  
Eastern Pacific ◽  
Host Switching ◽  
Geographical Proximity ◽  
Review Of The Literature ◽  
West Pacific ◽  
The World ◽  
Host Parasite ◽  
Trematode Parasites

Groupers (Epinephelinae) are prominent marine fishes distributed in the warmer waters of the world. Review of the literature suggests that trematodes are known from only 62 of the 159 species and only 9 of 15 genera; nearly 90% of host–parasite combinations have been reported only once or twice. All 20 families and all but 7 of 76 genera of trematodes found in epinephelines also occur in non-epinephelines. Only 12 genera of trematodes are reported from both the Atlantic–Eastern Pacific and the Indo–West Pacific. Few (perhaps no) species are credibly cosmopolitan but some have wide distributions across the Indo–West Pacific. The hierarchical ‘relatedness’ of epinephelines as suggested by how they share trematode taxa (families, genera, species) shows little congruence with what is known of their phylogeny. The major determinant of relatedness appears to be geographical proximity. Together these attributes suggest that host-parasite co-evolution has contributed little to the evolution of trematode communities of epinephelines. Instead, they appear to have arisen through localized episodes of host-switching, presumably both into and out of the epinephelines. The Epinephelinae may well be typical of most groups of marine fishes both in the extent to which their trematode parasites are known and in that, apparently, co-evolution has contributed little to the evolution of their communities of trematodes.

Larval trypanorhynch cestodes in teleost fish from Moreton Bay, Queensland

2017 ◽  
Vol 68 (11) ◽  
pp. 2123 ◽  
Author(s):  
I. Beveridge ◽  
T. H. Cribb ◽  
S. C. Cutmore
Keyword(s):  
Host Species ◽  
Teleost Fish ◽  
New Caledonia ◽  
The South ◽  
West Pacific ◽  
Moreton Bay ◽  
South West ◽  
Lizard Island ◽  
The World

During a helminthological examination of teleost fish of Moreton Bay (Qld, Australia), 976 fish from 13 orders, 57 families and 133 species were examined and nine species of trypanorhynch metacestodes were identified. Callitetrarhynchus gracilis (Rudolphi, 1819) was the most frequently encountered species, found in 16 species of fish, with Callitetrarhynchus speciosus (Linton, 1897), Pterobothrium pearsoni (Southwell, 1929), Otobothrium alexanderi Palm, 2004, Otobothrium mugilis Hiscock, 1954, Otobothrium parvum Beveridge & Justine, 2007, Proemotobothrium southwelli Beveridge & Campbell, 2001, Pseudotobothrium dipsacum (Linton, 1897) and Heteronybelinia cf. heteromorphi Palm, 1999 occurring in fewer host species and at lower prevalences. Comparisons are made with studies elsewhere in the world and specifically within the South-west Pacific. Of the best studied regions in the South-west Pacific (Heron Island, Lizard Island, New Caledonia and now Moreton Bay), the fauna from Moreton Bay was found to be the most distinctive, with fauna from the three reef locations sharing 35–48% of species between sites and just 12–24% with Moreton Bay. The fauna of trypanorhynch cestodes from Lizard Island and New Caledonia was found to be the most similar.

Note on host-parasite relationships observed in fluke infections of wild aquatic birds

Parasitology ◽  
1960 ◽  
Vol 50 (3-4) ◽  
pp. 323-327 ◽  
Author(s):  
B. P. Pande ◽  
S. S. Ahluwalia ◽  
J. S. Srivastava
Keyword(s):  
Wild Birds ◽  
Aquatic Species ◽  
Aquatic Birds ◽  
Representative Species ◽  
Helminthic Infections ◽  
House Crow ◽  
Host Parasite ◽  
Trematode Parasites

The last twenty-five years have witnessed an increasing output of significant work in this country on the trematode parasites of a number of wild birds, including aquatic species. These studies, which are mostly faunistic, and can be said to have commenced in 1926, when Bhalerao (1926) described from Burma (then a province of India) the flukes of the house crow, deal primarily with a large number of representative species of nearly twenty families of Digenea. Of these families, species assignable to the Clinostomidae Lühe, 1901, the Cyathocotylidae Poche, 1926, the Cyclocoelidae Kossack, 1911, the Diplostomidae Poirier, 1886, the Echinostomatidae Poche, 1926, the Notocotylidae Lühe, 1909, the Opisthorchiidae Braun, 1901, and the Strigeidae Railliet, 1919, were encountered in a survey conducted to assess the nature of helminthic infections in wild aquatic birds of the Mathura area.

A Spatial Model of Internal Displacement and Forced Migration

2020 ◽  
pp. 002200272095847
Author(s):  
Jon Echevarria-Coco ◽  
Javier Gardeazabal
Keyword(s):  
Spatial Model ◽  
Forced Migration ◽  
Real Data ◽  
Internal Displacement ◽  
Internally Displaced Persons ◽  
Geographical Proximity ◽  
Internally Displaced ◽  
Country Size ◽  
The World ◽  
Displaced People

This article develops a spatial model of internal and external forced migration. We propose a model reminiscent of Hotelling’s spatial model in economics and Schelling’s model of segregation. Conflict is modeled as a shock that hits a country at certain location and generates displacement of people located near the shock’s location. Some displaced people cross a border, thus becoming refugees, while others remain as Internally Displaced Persons (IDPs). The model delivers predictions about how the fractions of a country’s population that become refugees and IDPs ought to be related with the intensity of the shock, country size, terrain ruggedness and the degree of geographical proximity of the country with respect to the rest of the world. The predictions of the model are then tested against real data using a panel of 161 countries covering the period 1995-2016. The empirical evidence is mostly in line with the predictions of the model.

scholarly journals European Direct Investment in Brazil, 1860 to the Present

2010 ◽  
Vol 3 (1) ◽  
Author(s):  
Sérgio de Oliveira Birchal ◽  
Âmara Fuccio de Fraga e Silva
Keyword(s):  
United States ◽  
20Th Century ◽  
Direct Investment ◽  
World Economy ◽  
The United States ◽  
Geographical Proximity ◽  
Japanese Firms ◽  
The World ◽  
The Usa ◽  
Western European

European direct investment in Brazil dates back to the discovery of the country and has been since then either hegemonic or more important than a superficial observation can grasp, as this work aims at showing. During the 20th century, the United States has replaced Britain as the worlds economic superpower and the largest direct investor. US dominance in the world economy and geographical proximity to Brazil would suggest that US investments were by far the largest in the country during that century. Furthermore, as Japan had become the second largest economy in the world in the 1980s, we would expect that this would be reflected in the data of the largest multinationals in Brazil. However, as our investigation suggests, Western European direct investment has been as large (and in many occasions even larger) as that of the USA and Japanese firms have never had a prominent presence among the largest firms in Brazil, at least until the late 1990s.

scholarly journals Analysis of the Role of Female Hormones During Infection by COVID-19

2021 ◽  
Vol 43 (12) ◽  
pp. 940-948
Author(s):  
David Balbino Pascoal ◽  
Isabela Macêdo de Araujo ◽  
Lorenna Peixoto Lopes ◽  
Cristiane Monteiro da Cruz
Keyword(s):  
Relative Risk ◽  
Adverse Effects ◽  
Data Sources ◽  
Hormonal Contraceptives ◽  
Review Of The Literature ◽  
Sexual Hormones ◽  
Auxiliary Data ◽  
The World ◽  
Coronavirus Infection

AbstractWomen have metabolic, immunological, and genetic variables that ensure more protection from coronavirus infection. However, the indication of treatment for several pathologies and contraception is determined by hormones that have adverse effects and raise doubts about their use during the COVID-19 pandemic. Therefore, the present study searches women specificities and the relation between female sexual hormones and COVID-19, and reports the main recommendations in this background. To this end, a review of the literature was conducted in the main databases, auxiliary data sources, and official websites. Therefore, considering the hypercoagulability status of COVID-19, the debate about the use of contraceptives due to the relative risk of thromboembolic effects that they impose arises. However, the current available evidence, as well as the recommendations of main health organs around the world, demonstrate that the use of hormonal contraceptives must be maintained during the pandemic.

THE RHEUMATIC CHILD AND HIS WORLD

PEDIATRICS ◽  
1957 ◽  
Vol 19 (5) ◽  
pp. 916-922
Author(s):  
Iago Galdston
Keyword(s):  
Rheumatic Fever ◽  
External World ◽  
The Body ◽  
Statistical Analyses ◽  
Review Of The Literature ◽  
Question Asking ◽  
Claude Bernard ◽  
The World ◽  
Etiologic Research

IT IS PROVERBIAL that a fool can ask more questions than a wise man can answer. It is not proverbial that for the question-asking fool there is some hope and for the others, none. Now it is my intention on this occasion to play the fool awhile, to ask a great number of questions, and I cordially invite you to join me in this game. I want to inquire into The World of the Rheumatic Child, into his internal as well as into his external world, or, as Claude Bernard has phrased it, into his milieu interieur and into his milieu exterieur. Now there is some method to my folly, and it amounts to this. We know a great deal about the disease rheumatic fever and about its devastating effects within the body of its victim. But we do not know a great deal, indeed only a very little, about the victim within whose body the disease effects its devastations. I said—we know a great deal about the disease itself. In preparation for this talk I "re-surveyed the literature" and I found it, as I have known it to be, not only enormous in quantity but most impressive in quality. It is literally studded with masterpieces of etiologic research, of clinical surveys, of pathologic studies, of follow-up surveys, of epidemiologic analyses, and of therapeutic enterprises. In my review of the literature I came upon some old and esteemed friends whose works I had witnessed "in the making," the studies, for example, of Wyckoff, and those of Alfred Cohn; Claire Ling's penetrating statistical analyses, Pearl Raymond's biologic speculations, May Wilson's classical and encyclopedic résumé of knowledge—and upon a host of others, too numerous, really, to catalogue.

Inactivation of Sarcocystis bradyzoites in food; a review

2021 ◽  
Author(s):  
Hadi Valizadeh
Keyword(s):  
Systematic Review ◽  
Gamma Rays ◽  
Meat Industry ◽  
Review Of The Literature ◽  
Control Techniques ◽  
The World ◽  
Cardiac Muscles ◽  
Infected Meat ◽  
And Control ◽  
Internet Databases

The eradication of Sarcocystis-infected corpses costs the meat industry millions of dollars each year. Because this parasite is most commonly found in skeletal and cardiac muscles, preventative and control techniques such as inactivating or destroying the bradyzoites in infected meat are critical. The goal of this research was to look at the various methods for inactivating this parasite and to compare the results of these methods. Using internet databases from many fields and around the world, a systematic review of the literature was conducted. Heating, freezing, irradiation, and marination were all utilized to inactivate this parasite, and each had a distinct effect, according to the studies. Inactivation can be achieved by heating at 60°C for 20 min or freezing at -4ºC for 2 days. Also, 2 kGy of gamma rays and marination in 6% NaCl and 3% acetic acid for 48 h are enough.

Rigor, Relevance and Research Paradigms

2011 ◽  
pp. 117-132
Author(s):  
John C. Beachboard
Keyword(s):  
Social Science ◽  
Review Of The Literature ◽  
Science Field ◽  
The Social ◽  
The World ◽  
Conducting Research ◽  
Research Meeting ◽  
Social Science Field ◽  
Research Frameworks ◽  
Intellectual Journey

A practitioner leaves behind the world of failed multimillion-dollar information systems projects to seek solutions in academe. In making the transition from IS practitioner to IS researcher, the author encounters two fundamental tensions regarding the conduct of social science. The first tension concerns the challenge of conducting research meeting the criteria of scientific rigor while addressing issues relevant to practitioners. The second tension centers on the debate concerning the suitability of positivist and non-positivist approaches to research in the social sciences. A review of the literature discussing these tensions led the author to the observation that the two tensions appear to be related. This insight led to the investigation of multi-paradigmatic research frameworks as a means of reconciling these related tensions. The essay provides a personalized account regarding the author’s motivation for conducting practitioner-oriented research, the intellectual journey made through the literature to acquire tools of the social science field, and his observations concerning the advantages of multi-paradigmatic research in the IS field.

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