THE INFLUENCE OF TIDAL AND RAINFALL CYCLES ON INTERTIDAL NEMATODES: A CASE STUDY IN A TROPICAL SANDY BEACH

Venekey, Virag; Santos, Paulo Jorge Parreira dos; Fonsêca-Genevois, Verônica Gomes da

doi:10.1590/S1679-87592014061706204

Brasil

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Articles • Braz. j. oceanogr. 62 (4) • Oct-Dec 2014 • https://doi.org/10.1590/S1679-87592014061706204 linkcopy

THE INFLUENCE OF TIDAL AND RAINFALL CYCLES ON INTERTIDAL NEMATODES: A CASE STUDY IN A TROPICAL SANDY BEACH

Authorship SCIMAGO INSTITUTIONS RANKINGS

The present study describes the nematode assemblage of the bay of Tamandaré (Brazil), a tropical sandy beach, during the low, flood, high and ebb tides of two consecutive tidal cycles in four different months of the year (May, July, September and November). The nematode assemblage was dominated by Metachromadora and Perepsilonema and varied significantly between months and tides. Densities were lower in July, and changes in assemblage structure occurred during the transitional periods between rainy and dry months, which showed the influence of rainfall. Flood and ebb tides appeared to exercise the greatest influences over the tidal cycle, although the patterns were not very clear. Identification at genera/species level is recommended for future studies, to better understand the patterns of nematode assemblages during tidal cycles.

Brazil; Intertidal environment; Marine nematodes; Meiobenthos; Seasonal variations; Tides

Factor	DF	MS	Pseudo-F	P(perm)
Months	3	21127	19.393	0.0001*
Tides	3	1762	1.6173	0.0449*
Days	1	1268.5	1.1643	0.3296
Months x Tides	9	2052	1.8835	0.0001*
Months x Day	3	2084.2	1.9131	0.0103*
Periods
Tides x Day Periods	3	1598.1	1.4669	0.0783
Months x Tides x	9	1518.5	1.3938	0.0319*
Day Periods
Residue	62	1089.5
Total	93

Factor	T	P(perm)
May x July	4.1038	0.0001*
May x September	4.5083	0.0001*
May x November	6.6653	0.0001*
July x September	2.7109	0.0002*
July x November	4.613	0.0001*
September x November	3.6815	0.0001*
Ebb x Low	1.1234	0.2746
Ebb x Flood	1.507	0.0329*
Ebb x High	0.539	0.9336
Low x Flood	0.847	0.6465
Low x High	1.3024	0.1223
Flood x High	1.7884	0.0074*

Factor	T	P(perm)
May
Ebb x Low	0.701	0.775
Ebb x Flood	1.298	0.159
Ebb x High	1.313	0.174
Low x Flood	1.746	0.012*
Low x High	2.146	0.004*
Flood x High	1.459	0.132
July
Ebb x Low	1.471	0.099
Ebb x Flood	1.821	0.021*
Ebb x High	0.798	0.758
Low x Flood	0.735	0.727
Low x High	1.652	0.048*
Flood x High	2.037	0.006*
September
Ebb x Low	1.473	0.056
Ebb x Flood	1.057	0.372
Ebb x High	1.011	0.461
Low x Flood	1.264	0.114
Low x High	1.237	0.152
Flood x High	0.522	0.978
November
Ebb x Low	1.007	0.443
Ebb x Flood	2.044	0.006*
Ebb x High	0.498	0.909
Low x Flood	1.547	0.043
Low x High	0.721	0.841
Flood x High	1.937	0.003*

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Universidade de São Paulo, Instituto Oceanográfico Praça do Oceanográfico, 191 , 05508-120 Cidade Universitária, São Paulo - SP - Brasil, Tel.: (55 11) 3091-6501, Fax: (55 11) 3032-3092 - São Paulo - SP - Brazil
E-mail: io@usp.br

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