Sex ratio determination and worker reproduction in the slave-making ant Harpagoxenus sublaevis

Abstract Previous studies have shown that in most pair matings of Mytilus edulis, M. trossulus, and M. galloprovincialis there is a large sex-ratio bias in favor of either males or females. The degree of bias is a characteristic property of the female parent, as matings of the same female with different males produce the same sex ratio, but matings of the same male with different females produce different sex ratios. All three species possess the unusual feature of doubly uniparental inheritance of mitochondrial DNA (mtDNA); i.e., they contain two distinct types of mtDNA, one that is transmitted matrilinearly and one that is transmitted patrilinearly. This coupling of sex and mtDNA transmission raises the possibility that the mechanism of sex-ratio determination in mussels might be under the control of the mtDNA of the female parent. Here we present data from pedigreed crosses that confirm the previous observations that in mussel matings there is a strong sex-ratio bias and that the bias is under the control of the female parent. In addition, these data strongly suggest that this control is exercised by the mother's nuclear rather than mitochondrial genotype. Making use of these findings we develop a model of mother-dependent sex determination and use data from crosses involving wild females to test the model's predictions at the population level.

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ANALISIS HUBUNGAN PANJANG BERAT DAN NISBAH KELAMIN UDANG KARANG (Panulirus spp) DI KEPULAUAN SPERMONDE SULAWESI SELATAN

JOURNAL OF INDONESIAN TROPICAL FISHERIES (JOINT-FISH) : Jurnal Akuakultur, Teknologi Dan Manajemen Perikanan Tangkap, Ilmu Kelautan ◽

10.33096/joint-fish.v1i1.14 ◽

2018 ◽

Vol 1 (1) ◽

pp. 1-10

Author(s):

Hasrun Abdullah ◽

Kasmawati Saleh

Keyword(s):

Sex Ratio ◽

Coral Reefs ◽

Spiny Lobster ◽

Biological Parameters ◽

Biological Resources ◽

Weight Relationship ◽

Pattern Growth ◽

Ratio Determination

The Spermonde Island consists of 120 is one of the island's territory the spread of coral reefs is quite extensive, which is located in the territorial waters of Makassar Strait is a wealth of biological resources that are potential good flora as well as fauna among them are Spiny Lobster (Panulirus spp). The purpose of this research is to know the kinds of Spiny Lobster, length-weight relationship and the sex ratio in the spermonde Island. To achieve these goals then performed the measurement of biological parameters, namely the measurement of length, weight, and sex ratio determination. The method to be used is the measurement of the length of the carapace with uses measurent board, heavy with weights, and to sex by looking at the characteristics on the abdomen. Observations made on the island was the location of a 6 catching Spiny Lobster by dividing three (3) Zones based on the distance from the coast and the population.Was found that there were three types of Spiny Lobster namely spiny lobster pearls (P. Ornatus) as 334 individual lobster or 39,06 %, Spiny Lobster bamboo (P. versicolor) as many as 312 individual lobster or 36,49 %, and Spiny Lobster batik (P. Longipes) as 209 individual lobster or 24,44 % .The sex ratio of spiny lobster of spiny lobster batik (P. longipes) is 0,51:0,49, or (1:1) , Spiny Lobster pearls (P.ornatus) is 0,51: 0,49 or (1:1) and Spiny Lobster bamboo (P. Versicolor) is 0,63: 0,37 or (2:1). Pattern growth Spiny Lobster bamboo is allometrik negative, and the pattern growth Spiny Lobster pearls and Spiny Lobster batik is allometrik major .

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Determination of the Sexual Maturity of Threadfins Polydactylus quadrifilis (Cuvier, 1829), Galeoides decadactylus (Bloch, 1795) and Pentanemus quinquarius (Linné, 1758) of the Artisanal Marine Fishery of Grand-Lahou (Ivory Coast)

Journal of Scientific Research and Reports ◽

10.9734/jsrr/2019/v23i130112 ◽

2019 ◽

pp. 1-9

Author(s):

Kouassi Sylvain Konan ◽

Ebram Luc Gervais Djadji ◽

Yao Nicolas Amon ◽

Konan N’da

Keyword(s):

Sex Ratio ◽

Sexual Maturity ◽

Warm Season ◽

Cold Season ◽

First Year ◽

Marine Fishery ◽

Ratio Determination ◽

First Maturity ◽

First Year Of Life

Reproduction of the threadfins of the costal shelf of Grand-Lahou was studied with a monthly sampling frequencies range from may 2009 to april 2011. 534 specimens of Polydactylus quadrifilis, composed of 315 males and 219 females and 648 Galeoides decadactylus composed of 420 males and 228 females, then 453 individuals of Pentanemus quinquarius composed of 210 males and 243 females were used. The sexual maturity parameters of threadfins fishes indicate a size of first maturity (L50 = 67.5 cm) for females of Polydactylus quadrifilis and (L50 = 55.5 cm) with their males. Concerning the specimens of Pentanemus quinquarius, females present (L50 = 15 cm) and their males (L50 = 14.5 cm). This parameter has identical values with the females of Galeoides decadactylus (L50 = 15.5 cm) and their males (L50 = 15.5 cm). The individuals of Polydactylus quadrifilis and the specimens of Galeoides decadactylus and Pentanemus quinquarius become mature at 1 year of age. The sex ratio determination show that specimens of Polydactylus quadrifilis show a predominance of males during the warm season, from October (73.68%) to March (64.28%) which weakens during the cold season, from May (30%) to July (58%). For Galeoides decadactylus, the sex ratio shows a predominance of males, from August (88%) to March (94.73%). Concerning specimens of Pentanemus quinquarius, the sex ratio is in favor of the females whose lowest value is during the cold season in July (21.74%). All threafin species reach sexual maturity from their first year of life with different sex ratios variations.

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