1,720,956 research outputs found
Feeding scorpionfish (Scorpaena porcus), from the Medulin Bay
No full textU ovom radu istraživan je sastav i intenzitet ishrane škrpoča, Scorpaena porcus (Linneaus, 1758) u Medulinskom zaljevu, na južnoj i jugozapadnoj strani otočića Bodulaš. Sadržaj probavila analiziran je na 163 jedinki, ukupne duljine (TL) od 12,4 do 27,2 cm, uzrokovanih metodom trostrukih mreža stajaćica (poponica), s dvije različite veličine oka mahe 32 mm i 40 mm pri ribolovu na doček. Intenzitet hranjenja kod škrpoča u Medulinskom zaljevu najniži je u ljetnom razdoblju, odnosno u vrijeme mrijesta. Glavnu hranu škrpoču predstavljaju deseteronožni rakovi (Decapoda), dok se ribljim plijenom hrani manje. Od deseteronožnih rakova (Decapoda) po svim indeksima hranidbe najzastupljenija je vrsta Liocarcinus corrugatus. U proljeće su u hranidbi zastupljeniji rakovi tvrđeg okolopa, dok na jesen prevladavaju kozice (rakovi mekšeg oklopa). Dob ulovljenih jedinki škrpoča varira od 2 do 10 godina. Odnos spolova, mužjaka prema ženkama bio je 1:17,1. Starost škrpoča je u slabijoj vezi sa svojtama plijena, ali su plijen s mekanim oklopom češće konzumirale mlađe jedinke, dok su plijen s tvrdim oklopom češće konzumirale starije jedinke škrpoča. Uz navedeno, riba je više bila prisutna u želudcima mlađih jedinki.In this research, the composition and feeding intensity of the black scorpionfish, Scorpaena porcus (Linneaus, 1758) in the Medulin Bay, on the south and southwest side of the islet Bodulaš, was investigated. The content of the digestive tract was analyzed on 163 individuals whose total length (TL) varied from 12.4 to 27.2 cm, collected by the method of "poponica" mesh, different mesh sizes of 32 mm and 40 mm.The feeding intensity of the black scorpionfish in the Medulin Bay is lowest in the summer, ie during spawning. In the Medulin Bay, the main prey of the black scorpionfish are crustaceans from the order Decapoda, while fish prey is eaten less. Of the order Decapoda, according to all indices, the most important is the species Liocarcinus corrugatus. In the spring, crabs of harder shells are present in the diet, while in autumn, shrimps (crabs of softer shells) predominate. The age of the caught black scorpionfish varies from 2 to 10 years.
The sex ratio of males to females was 1: 17.1. The age of the black scorpionfish is less closely related to the prey species, but soft-shelled prey was more often consumed by younger specimens, while hard-shelled prey was more often consumed by older specimens. In addition, fish was more present in the stomachs of younger individuals
Morphological and ecological characteristics of bluefish, Pomatomus saltatrix (Linnaeus, 1766) from the northern Adriatic
No full textStrijelka, Pomatomus saltatrix (Linnaeus, 1766) je termofilna, pelagička i migratorna vrsta koja
posljednjih godina postaje sve prisutnija i na području sjevernog Jadrana. Analizirano je 112 jedinki,
prikupljenih od ribara s područja Istre i Kvarnera u razdoblju od travnja 2022. do travnja 2023. godine.
Statistički značajne razlike (p<0,05) utvrđene su između spolova za sljedeće morfometrijskih omjere:
duljina baze druge dorzalne peraje (D2)/ukupna duljina (TL), duljina baze analne peraje (LA)/ukupna
duljina (TL), preanalna duljina (PA)/ukupna duljina (TL), maksimalna tjelesna širina (BW)/ukupna
duljina (TL) i visina njuške (SH)/duljina glave (CL). Metodom vezane mreže nije pronađena statistički
značajna razlika između spolova. Perajna formula strijelke u sjevernom Jadranu je D: VII+25, P: 15, V:
VI, A: 26. Iako su utvrđene sezonske razlike, u ukupnom uzorku zabilježen je negativan alometrijski
rast za mužjake (b = 2,83), ~enke (b =2,79) i sve jedinke zajedno (b = 2,81). Prosječne vrijednosti
Fultonovog faktora kondicije (CF) za mužjake, ženke i sve jedinke zajedno su iznosile 0,84±0,07,
0,80±0,07 odnosno 0,82 ± 0,07 g/cm3. Najstarija jedinka u ovom istraživanju imala je 8 godina, a
parametri von Bertallanfyjeve krivulje dužinskog rasta strijelki u ovom radu su: L> = 105,3194 cm, K
= 0,1664 godina-1, t0 = -1,6421 godina. Intenzitet ishrane strijelke najvibi je u toplijem periodu godine,
a najznačajniji plijen bila je srdela (Sardina pilchardus). Prema vrijednostima gonadosomatskog
indeksa (GSI) u ovom istraživanju, mrijest strijelke u sjevernom Jadranu odvija se ljeti. Zabilježena je
značajna razlika u vrijednostima hepatosomatskog indeksa (HSI) između mužjaka i ženki tijekom
mrijesta.The bluefish, Pomatomus saltatrix (Linnaeus, 1766) is a thermophilic, pelagic and migratory species that has become more present in the area of the northern Adriatic in recent years. A total of 112 individuals, collected from fishermen in the area of Istria and Kvarner in the period from April 2022 to April 2023, were analyzed. Statistically significant differences (p = 105.3194 cm, K = 0.1664 year- 1, t0 = -1.6421 years. The feeding intensity of the bluefish is highest in the warmer period of the year, and the most important prey was the sardine (Sardina pilchardus). According to the gonadosomatic index (GSI) values in this study, spawning of the bluefish in the northern Adriatic takes place in summer. There wasa a significant difference in HSI values between males and females during spawning
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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