Atributos populacionais de <i>Littoraria angulifera</i> (Gastropoda: Littorinidae) em manguezais no estado da Bahia, Nordeste do Brasil

Boehs, G.; Freitas, L. A. de

G. Boehs ^**e-mail: gboehs@uesc.br; guislaboehs@hotmail.com

Universidade Estadual de Santa Cruz – UESC, Departamento de Ciências Biológicas – DCB, Ilhéus, BA, Brasil

Universidade Estadual de Santa Cruz – UESC, Departamento de Ciências Agrárias e Ambientais – DCAA, Programa de Pós-graduação em Ciência Animal, lhéus, BA, Brasil

http://orcid.org/0000-0002-2601-5599

L. A. de Freitas

Universidade Estadual de Santa Cruz – UESC, Departamento de Ciências Agrárias e Ambientais – DCAA, Programa de Pós-graduação em Ciência Animal, lhéus, BA, Brasil

http://orcid.org/0000-0001-5474-963X

*e-mail: gboehs@uesc.br; guislaboehs@hotmail.com

Figuras (3)
Tabelas (4)

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Figure 1
Map of northeastern Brazil showing the location of the Bahia State and the sampling stations (M1 and M2).

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Figure 2
Monthly absolute frequency of males and females of Littoraria angulifera collected throughout 2018 on trunks of Rhizophora mangle in two localities (A = M1; B = M2) in the coast of the Bahia State, northeastern Brazil.

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Figure 3
Total specimens of Littoraria angulifera collected monthly throughout 2018 on the grass Spartina alterniflora in a mangrove (M1) in Ilhéus, Bahia State, northeastern Brazil, distributed by size classes (shell height), being: C1 (less than 2.99 mm), C2 (3-5.9 mm), C3 (6-8.99 mm), C4 (9-11.99 mm), C5 (12-14.99 mm), C6 (15-17.99 mm) and C7 (18-20.99 mm); A-L: January to December.

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Table 1
Mean values and standard deviation (± SD) of the height and circumference of the red mangrove Rhizophora mangle on two horizontal levels (L1 and L2) of mangroves M1 and M2 on the coast of Bahia State, northeastern Brazil, based on the monthly biometry of 10 trees in each mangrove (5 L1 and 5 L2; n total = 120/ locality) throughout 2018.

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Table 2
Total number of Littoraria angulifera individuals (males and females) obtained throughout 2018 on Rhizophora mangle trunks in two mangroves (M1 and M2) on the coast of Bahia State, northeastern Brazil, showing the spatial distribution, being horizontal (levels L1 and L2) and vertical (H1 = 0-1 m height and H2 = 1-2 m height on the trunks).

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Table 3
Means and standard deviation (± SD) of shell height (mm) and total weight (g) of Littoraria angulifera in 2018, being sums of males and females, in horizontal (L1 and L2) and vertical (H1 and H2) levels of two mangroves (M1 and M2) on coast of Bahia, northeastern Brazil.

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Table 4
Monthly mean values of shell height (mm) and standard deviation (± SD) throughout 2018 of Littoraria angulifera, indicating, in parentheses, the smallest and largest individual in the samples, and showing the p values (by Tukey test with decision level of α = 0.05) where * indicates significantly different results (p<0.05), in two mangroves (M1 and M2) in the coast of Bahia State, northeastern Brazil.

Mangroves	Levels	Height (m)	Circumference (m)
M1	L1	4.63±0.88	0.19±0.08
	L2	4.55±0.58	0.32±0.24
	L1+L2	4.61±0.72	0.25±0.18
M2	L1	6.05±1.43	0.24±0.14
	L2	6.95±1.48	0.70±0.25
	L1+L2	6.59±1.49	0.30±0.21

Mangroves	Horizontal levels	Males	Females	Totals	Vertical levels	Males	Females	Totals
M1	L1	452	704	1,156	H1	904	1,445	2,349
M1	L2	731	1,048	1,779	H2	279	307	586
M2	L1	722	975	1,697	H1	707	1,215	1,922
M2	L2	462	693	1,155	H2	477	453	930

Parameters	Mangroves	Horizontal levels		Vertical levels
Parameters	Mangroves	L1	L2	H1	H2
Height (mm)	M1	17.60±7.50	16.31±4.43	16.57±6.17	17.81±4.28
	M2	21.28±3.47	22.82±6.61	21.75±5.75	22.21±3.07
Weight (g)	M1	0.84±0.55	0.76±0.79	0.78±0.75	0.82±0.49
	M2	1.67±0.93	1.94±1.06	1.92±1.12	1.98±0.64

Months	Mangroves
	M1			M2
	Males	Females	p values	Males	Females	p values
Jan	18.41±4.38	15.91±4.75	0.0000*	22.04±2.15	22.07±2.3	0.8848
Jan	(6.58-30.23)	(5.39-30.22)	0.0000*	(14.3-28.25)	(15.44-29.72)	0.8848
Feb	18.68±3.2	17.63±4.32	0.0210*	21.94±2.1	22.2±2.15	0.3019
Feb	(10.71-27.8)	(7.13-28.95)	0.0210*	(16.24-27.93)	(14.7-27.13)	0.3019
Mar	19.5±4.37	17.86±5.46	0.0148*	21.7±2.16	21.54±2.35	0.5414
Mar	(8.45-29.99)	(7.21-30.35)	0.0148*	(15.05-27.58)	(15.27-30.63)	0.5414
Apr	15.56±4.27	14.19±4.52	0.0011*	22.88±2.54	23.46±2.69	0.1651
Apr	(5.6-24.68)	(0.55-25.4)	0.0011*	(10.89-29.38)	(11.0-29.7)	0.1651
May	18.19±3.88	16.64±4.49	0.0110*	22.19±2.45	21.54±4.19	0.2114
May	(8.74-24.4)	(7.37-25.6)	0.0110*	(13.69-26.2)	(9.34-30.82)	0.2114
June	17.78±3.08	16.51±3.86	0.0022*	22.02±3.07	20.64±4.49	0.0191*
June	(11.19-25.29)	(8.36-26.47)	0.0022*	(10.97-29.08)	(9.12-28.66)	0.0191*
July	16.16±3.5	14.59±3.81	0.0050*	21.09±4.3	20.91±4.97	0.7857
July	(8.5-23.55)	(6.6-24.0)	0.0050*	(11.42-29.9)	(9.58-31.62)	0.7857
Aug	18.87±3.18	17.98±3.85	0.0062	23.26±3.52	22.25±5.23	0.1071
Aug	(10.93-24.54)	(8.54-29.25)	0.0062	(10.86-28.73)	(8.11-32.12)	0.1071
Sep	16.06±4.09	15.11±4.86	0.1432	22.46±3.19	21.16±4.55	0.0042*
Sep	(7.03-23.77)	(5.68-26.74)	0.1432	(13.07-29.93)	(12.19-33.28)	0.0042*
Oct	17.73±4.34	16.46±4.51	0.0526	22.06±4.17	22.05±4.67	0.9821
Oct	(6.83-26.23)	(6.75-25.49)	0.0526	(10.86-29.62)	(9.76-32.12)	0.9821
Nov	18.5±4.94	16.77±5.18	0.0329*	21.79±3.65	20.32±4.56	0.0324*
Nov	(2.03-29.99)	(5.94-29.97)	0.0329*	(12.34-28.09)	(9.58-28.85)	0.0324*
Dec	16.69±3.72	16.4±4.74	0.7493	21.67±2.08	22.04±2.08	0.2392
Dec	(7.13-22.75)	(6.37-25-35)	0.7493	(16.24-27.48)	(14.7-28.42)	0.2392

[1] *e-mail: gboehs@uesc.br; guislaboehs@hotmail.com

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Atributos populacionais de Littoraria angulifera (Gastropoda: Littorinidae) em manguezais no estado da Bahia, Nordeste do Brasil

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