scholarly journals The accuracy of field sex determination in the Common Whitethroat Sylvia c. communis

Ornis Svecica ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 67-70 ◽  
Author(s):  
Jonas Waldenström ◽  
Ulf Ottosson

The accuracy of field sex determination of Common Whitethroats captured during spring migration in Nigeria was tested with a genetic sex determination technique. Among both age classes males were more often correctly sexed than females. In total, one out of four birds were incorrectly sexed, and the ability to sex correctly varied considerably between ringers. Hence, a cautious attitude must be held at all times towards the use of field sex assessment in Common Whitethroats.

1999 ◽  
Vol 43 (3) ◽  
pp. 284-291 ◽  
Author(s):  
Melinda J. Portelli ◽  
Shane R. de Solla ◽  
Ronald J. Brooks ◽  
Christine A. Bishop

2014 ◽  
Vol 13 (1) ◽  
pp. 50-59
Author(s):  
A NisreenYasirJasim ◽  
Tahir A. Fahid ◽  
Talib Ahmed Jaayid

2012 ◽  
Vol 3 (1) ◽  
pp. 384-386
Author(s):  
Dr. Sudarshan Gupta ◽  
◽  
Dr. Bhadresh Vaghela ◽  
Dr. Deepak Howale ◽  
Dr. Mehul Tandel

2010 ◽  
Vol 5 (2) ◽  
pp. 59-66
Author(s):  
Kelven Lopes ◽  
Helder Lima de Queiroz

This study examined the traditional knowledge of fishermen at Mamirauá Reserve about sex determination of pirarucus, Arapaima gigas Schinz 1822. We evaluated the criteria used for by fishermen in the sector Jarauá at Mamirauá Reserve for this determination, during the fisheries season, from October to November 2004. We analyzed responses of a group of about 15 fishermen collected in structured interviews regarding 109 individual pirarucus, 65 males and 44 females. From this sample, only 64 fish have their sex correctly predicted by the fishermen. Although the traditional knowledge of local fishermen is a key component of the sustainable fisheries of this species, this knowledge is not functional in all ranges and aspects, as in sex distinction. We found that the local fishermen evaluated are not able to recognize the sex of pirarucus, although some criteria applied for this purpose are consistent with their biology. The rates of correct forecasts for recognition of males and females were similar to those obtained by chance, even when the criteria applied were consistent, as the criterion “coloration”, which was significantly consistent for identification of males. Yet the group of fishermen interviewed in this study apparently did not apply this criterion correctly.


1989 ◽  
Vol 30 (2) ◽  
pp. 155-164 ◽  
Author(s):  
Birthe Avery ◽  
Mette Schmidt

1989 ◽  
Vol 30 (2) ◽  
pp. 147-153
Author(s):  
Birthe Avery ◽  
Mette Schmidt ◽  
Torben Greve

2011 ◽  
Vol 73 (12) ◽  
pp. 1611-1616 ◽  
Author(s):  
Shoki YAMAZAKI ◽  
Yuta MOTOI ◽  
Kazuya NAGAI ◽  
Tsuyoshi ISHINAZAKA ◽  
Makoto ASANO ◽  
...  

1906 ◽  
Vol 26 ◽  
pp. 32-45
Author(s):  
J. G. Milne
Keyword(s):  

During the excavations of Messrs. Hogarth Grenfell and Hunt for the Egypt Exploration Fund in the winter of 1895–6 on the site of Karanis (Kom Ushim) in the Fayum, a considerable number of clay-sealings were found, mainly in the cellars of the Roman houses. These were recently put in my hands for investigation and offer some interesting material.The sealings have evidently come from various kinds of articles: in many instances the clay is too much broken for any determination of the shape which it had taken to be possible; but among the better preserved pieces are examples from the mouths of bottles, some of which have been squeezed down into the neck like a cork, others placed over a linen covering, sometimes tied down with cord: others are from the flat sides of wooden boxes, often showing the marks of cord: others again from parcels of irregular shape, in some cases seemingly wrapped in papyrus. The common points of all are that they consist of lumps of Nile-mud, and that they have been impressed, while the clay was damp, with signets, which were presumably those of the merchants who forwarded the goods upon which the sealings were placed.


Food Control ◽  
2010 ◽  
Vol 21 (5) ◽  
pp. 726-731 ◽  
Author(s):  
W.L. Bai ◽  
R.H. Yin ◽  
S.J. Zhao ◽  
C. Li ◽  
Z.J. Ma ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document