scholarly journals The Influence of Environmental Factors on the Population Structure and Reproductive Biology of <i>Idotea balthica basteri</i> (Isopoda, Valvifera) of the Bizerte Lagoon (Northern Tunisia)

2016 ◽  
Vol 06 (04) ◽  
pp. 206-218 ◽  
Author(s):  
Wahiba Zaabar ◽  
Faouzia Charfi-Cheikhrouha ◽  
Mohamed Sghaier Achouri
Keyword(s):  
Population Structure ◽  
Environmental Factors ◽  
Reproductive Biology ◽  
Bizerte Lagoon ◽  
Northern Tunisia ◽  
Idotea Balthica

scholarly journals Population structure and reproductive biology of Metamysidopsis neritica (Crustacea: Mysidacea) in a sand beach in south Brazil

2008 ◽  
Vol 25 (3) ◽  
pp. 403-412 ◽  
Author(s):  
Patrícia Calil ◽  
Carlos A. Borzone
Keyword(s):  
Population Structure ◽  
Reproductive Biology ◽  
Direct Relationship ◽  
Surf Zone ◽  
Population Characteristics ◽  
Egg Volume ◽  
Sand Beach ◽  
The World ◽  
Egg Number ◽  
South Brazil

Mysidacea are common sublittoral crustaceans that inhabit all coasts in the world. In this study, the population characteristics and the reproductive biology of Metamysidopsis neritica Bond-Buckup & Tavares, 1992 were studied in the surf zone of a south Brazilian beach (Atami). Mysids were sampled at monthly intervals from August, 1999 to July, 2000 (total of 29,490 individuals). Individuals were classified into six population categories. The highest abundance occurred in May (8,665) and August (6,415), and lowest in September (336) and December (368). Three main generations were identified, namely the summer, fall and winter generations. The winter generation was the longest (four to five months). The fall generation lasted four months, and the summer one extended from three to four months. Ovigerous females occurred throughout the year, with a greater proportion in July. The number of eggs or larvae varied from one to 16. Weak associations were found between female length and egg number, egg volume, and the number of larvae with and without eyes. Egg volume increased during the coldest season, whereas the smallest values were recorded during summer. These results suggest a possible direct relationship between egg volume and generation longevity.

Reproductive biology and population structure of Potimirim brasiliana Villalobos, 1959 (Decapoda, Atyidae) from a littoral fast-flowing stream, São Paulo State, Brazil

Crustaceana ◽  
2013 ◽  
Vol 86 (1) ◽  
pp. 67-83 ◽  
Author(s):  
Sergio Schwarz Da Rocha ◽  
Roberto Munehisa Shimizu ◽  
Sergio L. De Siqueira Bueno ◽  
Fernando L. Mantelatto
Keyword(s):  
Population Structure ◽  
Reproductive Biology ◽  
Sao Paulo ◽  
São Paulo ◽  
Paulo State ◽  
São Paulo State ◽  
Flowing Stream

Population Structure and Reproductive Biology of Saururus cernuus L. (Saururaceae)

1994 ◽  
Vol 9 (1) ◽  
pp. 47-55 ◽  
Author(s):  
LEONARD B. THIEN ◽  
ERIK G. ELLGAARD ◽  
MARGARET S. DEVALL ◽  
SARA E. ELLGAARD ◽  
PAUL F. RAMP
Keyword(s):  
Population Structure ◽  
Reproductive Biology

Reproduction and population structure of Achelous spinimanus (Crustacea: Portunoidea) in the northern coast of São Paulo, Brazil, and influence of environmental factors

Biologia ◽  
2019 ◽  
Vol 75 (9) ◽  
pp. 1373-1383 ◽  
Author(s):  
Camila Hipolito Bernardo ◽  
Veronica Pereira Bernardes ◽  
Thiago Elias da Silva ◽  
Aline Nonato de Sousa ◽  
Fabiano Gazzi Taddei ◽  
...  
Keyword(s):  
Population Structure ◽  
Environmental Factors ◽  
Sao Paulo ◽  
Northern Coast ◽  
São Paulo

Chromosomal changes in vertebrate evolution

1977 ◽  
Vol 199 (1136) ◽  
pp. 377-397 ◽  
Keyword(s):  
Population Structure ◽  
Reproductive Biology ◽  
Chromosome Banding ◽  
Chromosomal Rearrangements ◽  
Chromosomal Polymorphism ◽  
Vertebrate Evolution ◽  
Factors Influencing ◽  
Extant Species ◽  
Chromosomal Changes ◽  
Karyotypic Change

The immense variety of karyotypes found in extant species is unmistakable evidence that the process of evolution is associated with karyotypic change. The question whether the chromosome changes are a cause or a consequence of speciation has been debated intensely for many years and, as is often the case with biological problems, there has been no unequivocal answer. Evolution operates along different lines in different groups of organisms. In animals, reproductive biology and population structure are important factors influencing the rate of karyotypic change. Still, the most extreme chromosomal rearrangements are not necessarily found in the most specialized species. A great number of chromosome banding techniques has made it possible to study chromosomes of vertebrates in great detail. Some applications of these techniques to problems of chromosomal polymorphism in relation to mammalian speciation are presented.

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