scholarly journals Population structure of Sardinella gibbosa (Bleeker, 1849) with special reference to spawning ground in the Gulf of Suez, Egypt

2021 ◽  
Vol 25 (3) ◽  
pp. 353-365
Author(s):  
Tamer A. El-Betar ◽  
Hanan M. Osman
Keyword(s):  
Population Structure ◽  
Special Reference ◽  
Gulf Of Suez ◽  
Spawning Ground ◽  
Sardinella Gibbosa

Matrimonial migration: a review, with special reference to India

1977 ◽  
Vol 9 (4) ◽  
pp. 381-401 ◽  
Author(s):  
Partha Pratim Manjumder
Keyword(s):  
Population Structure ◽  
Special Reference ◽  
Human Population ◽  
Cultural Economic

SummaryThe study of the distribution of matrimonial distances is extremely important in the understanding of human population structure. The existing models of matrimonial migration are reviewed here. An assessment of the roles played by various social, cultural, economic, religious and linguistic factors in shaping the distribution of matrimonial distances has been made, with special reference to India.

Age, growth and population structure of jumbo flying squid, Dosidicus gigas, off the Costa Rica Dome

2012 ◽  
Vol 93 (2) ◽  
pp. 567-573 ◽  
Author(s):  
Xinjun Chen ◽  
Jianhua Li ◽  
Bilin Liu ◽  
Yong Chen ◽  
Gang Li ◽  
...  
Keyword(s):  
Population Structure ◽  
Costa Rica ◽  
Instantaneous Growth Rate ◽  
Spawning Ground ◽  
Dosidicus Gigas ◽  
Specific Population ◽  
Daily Growth ◽  
Growth Zones ◽  
Costa Rica Dome ◽  
Jumbo Flying Squid

Based on the samples collected in Chinese scientific surveys off the Costa Rica Dome from July to August in 2009, statolith microstructure of the jumbo flying squid, Dosidicus gigas, was analysed for studying their age, growth and population structure. Three typical growth zones (postnuclear, dark and peripheral zones), abnormal increments (checks) and aberrant microstructure (additional centre and additional rings) were found in the statoliths examined. Squid sizes ranged from 205 to 429 mm dorsal mantle length (ML) with ages no more than 10 months for females and 8 months for males. Back-calculated hatching dates were from November 2008 to April 2009. Growth in ML was best described by a linear function for both the sexes, while growth in body weight was best quantified by an exponential function for females and a power curve for males. The maximum absolute daily growth rates and instantaneous growth rate in ML were reached during 181–210 and 151–180 days for females and males, respectively. The Costa Rica Dome and its adjacent waters were considered as a potential spawning ground because of presence of not only high proportion of mature squid but also rhynchoteuthion paralarvae, and high primary productivity from the strong upwelling. This study suggests that D. gigas have complicated intra-specific population structure and large spatial variability in the key life history parameters.

Genetic diversity and population structure of Indian melon (Cucumis melo L.) landraces with special reference to disease and insect resistance loci

2016 ◽  
Vol 135 (3) ◽  
pp. 384-390 ◽  
Author(s):  
Lakshamana Reddy D. C. ◽  
Sudarshini K Venkat ◽  
Anand C Reddy ◽  
C. Aswath ◽  
K. N. Avinash ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Special Reference ◽  
Insect Resistance ◽  
Cucumis Melo ◽  
Cucumis Melo L

scholarly journals Inter- and intra-specific genetic divergence of Asian tiger frogs (genus Hoplobatrachus), with special reference to the population structure of H. tigerinus in Bangladesh

2016 ◽  
Vol 91 (4) ◽  
pp. 217-227
Author(s):  
Nasrin Sultana ◽  
Takeshi Igawa ◽  
Mohammed Mafizul Islam ◽  
Mahmudul Hasan ◽  
Mohammad Shafiqul Alam ◽  
...  
Keyword(s):  
Population Structure ◽  
Special Reference ◽  
Genetic Divergence ◽  
Asian Tiger

scholarly journals The first investigation record of threatened horseshoe crabs in the Banyuasin estuarine, South Sumatra, Indonesia

2019 ◽  
Vol 24 ◽  
pp. 17-24
Author(s):  
Fauziyah . ◽  
Anna I.S. Purwiyanto ◽  
Wike A.E. Putri ◽  
Fitri Agustriani ◽  
Apon Z. Mustopa ◽  
...  
Keyword(s):  
Population Structure ◽  
Geographical Distribution ◽  
Spawning Ground ◽  
Spawning Activity ◽  
Body Weights ◽  
Horseshoe Crabs

The first investigation of the Asian horseshoe crabs in the Banyuasin Estuarine (Indonesia) was carried out during July 16-31, 2019. Sampling was conducted together with local fishermen using a trammel net.  Two species of the Asian horseshoe crabs have been identified from 52 obtained specimens, namely Carcinoscorpius rotundicauda (♂ = 18, ♀ = 27) and Tachypleus gigas (♂ = 5, ♀ = 6). The prosoma width for the two species was 100-150 mm and 115-210 mm respectively, with body weights of 72- 285 grams and 99- 918 grams, respectively. All specimens of C. rotundicauda were adults (their prosomal width ≥ 8 cm). Female was larger in size than male for both species. Its geographical distribution was from the waters near mangroves up to 4.2 km towards the sea. These results indicated that Banyuasin Waters was included in the geographical distribution coverage for both species. Further studies were needed to assess population structure, abundance, spawning ground, spawning activity, growth aspects as well as morphometric and DNA studies.

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