Life history traits of Characidium pterostictum (Characiformes, Crenuchidae) along the longitudinal gradient of a Neotropical river in southern Brazil Author Fitz, Raquel C. Author Rodenbusch, Cesar A. . Setor de Ictiologia, Museu de Ciências Naturais, Fundação Zoobotânica do Rio Grande do Sul, Rua Dr. Salvador França, 1427, 90.690 - 000 Porto Alegre, RS, Brazil. (marco-azevedo @ fzb. rs. gov. br) Author Dala-Corte, Renato B. . Setor de Ictiologia, Museu de Ciências Naturais, Fundação Zoobotânica do Rio Grande do Sul, Rua Dr. Salvador França, 1427, 90.690 - 000 Porto Alegre, RS, Brazil. (marco-azevedo @ fzb. rs. gov. br) Author Azevedo, Marco A. . Programa de Pós-Graduação em Ecologia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, Caixa Postal 15007, 91501 - 970 Porto Alegre, RS, Brazil. text Iheringia, Série Zoologia 2017 e 2017002 2016-12-31 107 1 11 http://dx.doi.org/10.1590/1678-4766e2017002 journal article 10.1590/1678-4766e2017002 1678-4766 10525515

Tab. I. Total and monthly differences between male and female number of individuals of Characidium pterostictum Gomes, 1947, sampled in the intermediate and downstream sites, upper Sinos river, RS, between January and December 2007. Only females were collected in upstream site. Values with an asterisk indicate significant differences in sex ratio, according to the chi-square test (χ²).

		Intermediate			Downstream
	Males	Females	χ²	Males	Femaless	χ²
January	0	1		10	6	1.00
February	0	2		3	5	0.50
March	0	4		1	2	0.33
April	0	1		6	6	0.00
May	1	9	6.40*	2	6	1.00
June	3	6	1.00	5	8	0.69
July	1	11	8.33*	1	6	3.57
August	0	1		8	8	0.00
September	0	3		6	6	0.00
October	0	1		2	5	1.29
November	2	9	4.45*	4	7	0.82
December	6	16	4.55*	2	8	3.60
Total	13	64	23.1**	50	73	4.3*