scholarly journals Paedomorphosis in the Ezo salamander (Hynobius retardatus) rediscovered after almost 90 years

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Hisanori Okamiya ◽  
Ryohei Sugime ◽  
Chiharu Furusawa ◽  
Yoshihiro Inoue ◽  
Osamu Kishida
Keyword(s):  
The South ◽  
Caudal Fin ◽  
Fertilization Experiment ◽  
Artificial Fertilization

AbstractAlthough paedomorphosis is widespread across salamander families, only two species have ever been documented to exhibit paedomorphosis in Hynobiidae. One of these two exceptional species is Hynobius retardatus in which paedomorphosis was first reported in 1924, in specimens from Lake Kuttara in Hokkaido. This population became extinct after the last observation in 1932; since then, no paedomorphs of this species have been reported anywhere. Here, we report the rediscovery of paedomorphs of this species. Three paedomorph-like male salamanders were collected from a pond in the south Hokkaido in December 2020 and April 2021; in size, these specimens were similar to metamorphosed adults but they still displayed larval features such as external gills and a well-developed caudal fin. An artificial fertilization experiment demonstrated that they were sexually compatible with metamorphosed females, thus, confirming them to be paedomorphs. Future efforts to find additional paedomorphs in this and other populations are required to assess the prevalence of paedomorphosis in H. retardatus and to improve understanding of the ecology and evolution of paedomorphisis in Urodela.

Acanthurus tractus Poey, 1860, a valid western Atlantic species of surgeonfish (Teleostei, Acanthuridae), distinct from Acanthurus bahianus Castelnau, 1855

Zootaxa ◽  
2011 ◽  
Vol 2905 (1) ◽  
pp. 63 ◽  
Author(s):  
MOISÉS A. BERNAL ◽  
LUIZ A. ROCHA
Keyword(s):  
Distinct Species ◽  
South Atlantic ◽  
Genetic Differences ◽  
Southern Brazil ◽  
The South ◽  
Caudal Fin ◽  
Western Atlantic ◽  
Dorsal Fin ◽  
Bright Yellow ◽  
Central Atlantic

The ocean surgeonfish, Acanthurus bahianus, has been historically recorded from Bermuda and Massachusetts to southern Brazil and the islands of the central Atlantic. We have found that individuals in the southwestern and central Atlantic consistently have a posterior bright yellow margin on the caudal fin and an orange/red margin on the dorsal fin. This coloration is different from the characteristic white/blue fin margins on individuals from the northwestern Atlantic. In addition, there is a clear genetic distinction (d= 2.4% mtDNA, CytB) between these two lineages. With the corroborating coloration and genetic differences, we suggest that these two lineages represent distinct species. The South Atlantic species retains the name of A. bahianus and we propose to resurrect A. tractus (Poey 1860) as the valid name for the northwestern Atlantic species.

scholarly journals EVALUATION OF SIZE-WEIGHT COMPOSITION OF MACKEREL IN THE SOUTH-EAST ATLANTICS

2018 ◽  
pp. 25-29
Author(s):  
Don Kouame Raphael ◽  
Vladimir Ivanovich Fomenko
Keyword(s):  
Ivory Coast ◽  
Mean Value ◽  
Minimal Length ◽  
Fish Length ◽  
Commercial Fishing ◽  
The South ◽  
Atlantic Region ◽  
Caudal Fin ◽  
Study Objective ◽  
The Relationship

The article is devoted to evaluation of the dimensional composition of mackerel in the South-East part of the Atlantic ocean. The study was carried out in Abidjan on the Ivory coast, specifically, at the Abidjan Autonomous port. The study objective was to establish the relationship between the total length and the weight of mackerel, as well as between the length of the mackerel body without the caudal fin and its weight. Weight of mackerel caught during commercial fishing in autonomous port of Abidjan was within 447.64-794.05 g, mean value being 591.08 g. Maximum length of mackerel made 41.5 cm, minimum is 35.2 cm (general length), mean value was 38.85 cm. Maximal fish length without caudal fin was 37.9 cm, minimal length - 31.7 cm, mean value made 35.13 cm. There has been stated linear dependence between general fish length and its weight. The research results will be used to further investigating the issue of industrial mackerel catches in the southeast Atlantic region.

Presidential Republicanism in the South, 1960

1962 ◽  
Vol 24 (2) ◽  
pp. 303-322 ◽  
Author(s):  
Bernard Cosman
Keyword(s):  
The South

Long-term Cyclic Variations of Prominences, Green and Red Coronae over Solar Cycles

2000 ◽  
Vol 179 ◽  
pp. 201-204
Author(s):  
Vojtech Rušin ◽  
Milan Minarovjech ◽  
Milan Rybanský
Keyword(s):  
Emission Lines ◽  
High Latitudes ◽  
Green Line ◽  
Solar Cycles ◽  
The South ◽  
Coronal Emission ◽  
Local Maxima ◽  
The North ◽  
Cyclic Variations

AbstractLong-term cyclic variations in the distribution of prominences and intensities of green (530.3 nm) and red (637.4 nm) coronal emission lines over solar cycles 18–23 are presented. Polar prominence branches will reach the poles at different epochs in cycle 23: the north branch at the beginning in 2002 and the south branch a year later (2003), respectively. The local maxima of intensities in the green line show both poleward- and equatorward-migrating branches. The poleward branches will reach the poles around cycle maxima like prominences, while the equatorward branches show a duration of 18 years and will end in cycle minima (2007). The red corona shows mostly equatorward branches. The possibility that these branches begin to develop at high latitudes in the preceding cycles cannot be excluded.

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