Nematode trophic structure in the phytotelma of Neoregelia cruenta (Bromeliaceae) in relation to microenvironmental and climate variables Cover

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Nematode trophic structure in the phytotelma of Neoregelia cruenta (Bromeliaceae) in relation to microenvironmental and climate variables

Journal of Nematology

Volume 52 (2020): Issue 1 (January 2020)

By: Alexandre M. Almeida and Ricardo M. Souza

Open Access

|Nov 2020

Figures & Tables

Bromeliads sampled in Restinga de Jurubatiba National Park. (A) Neoregelia cruenta; (B) Aechmea nudicaulis.

Number of nematodes recovered by sampling methods M1 through M5 from the phytotelma of Aechmea nudicaulis (left graphs) and Neoregelia cruenta (right). Different lowercase letters indicate different means by the Tukey test at 5%. Values are means of 16 plants for each method and each bromeliad species.

Fluctuation of nematode abundance (total and per trophic group) during seasons in the phytotelma of N. cruenta. Numbers in the columns indicate the standard error of the mean. Values are means of eight bromeliads sampled per season.

Monthly accumulated rainfall and monthly mean temperatures (air and water retained in the bromeliad phytotelma) in Restinga de Jurubatiba National Park.

Regression analysis between nematode abundance (total and per trophic group), organic matter impounded in the phytotelma, and physico-chemical variables of the water in the phytotelma of Neoregelia cruenta. OD: organic debris; DO2: Dissolved oxygen.

Descriptive statistics of impounded organic debris and physico-chemical variables of the water in the phytotelma of N_ cruenta_

	Variables
Statistics	OD^a(g)	Volume (ml)	DOC (mg.L⁻¹)	N (mg.L⁻¹)	Temp (°C)	pH	DO₂ (mg.L⁻¹)	DS (mg.L⁻¹)	EC (mS.cm⁻¹)
Mean (min–max)	13.7^b (1–51)	222.5 (37–910)	97.4 (15.9–574)	4.2 (0.1–12.8)	22.1 (20–29)	5.6 (3.5–8.1)	5.7 (3.2–8)	80 (8–247)	0.1 (0.01–0.4)
SD	10.4	157.8	108.5	2.9	2.6	0.7	1	56.6	0.1
CV %	75.8	71	111.4	68.2	11.7	12.5	17.6	70.7	72.7

Nematode abundance (total and per trophic groups) recovered from the phytotelma of mature N_ cruenta and A_ nudicaulis, in two phenological stages_

	Abundance
Species/phenological stage	Total	Bacterial feeders		Hyphal feeders	Carnivores
N. cruenta with inflorescence	194.6^aa		42.1a	48.8a	103.7a
N. cruenta without inflorescence	139.6b		15.2b	22.3ab	102.1a
A. nudicaulis with inflorescence	40.7c		1.2b	9.7b	29.8b
A. nudicaulis without inflorescence	49.9c		3.7b	10.2ab	36b

Statistical parameters for the correlation analysis between nematode abundance and climate variables in the phytotelma N_ cruenta_

	Statistical parameters
Abundance	p value	F test	r ²
Rainfall
Total	0.39	0.87	0.13
Bacterial feeders	0.78	0.08	0.01
Hyphal feeders	0.09	4.17	0.4
Carnivores	0.82	0.06	0.01
Air temperature
Total	0.97	0.001	0.0002
Bacterial feeders	0.77	0.09	0.02
Hyphal feeders	0.85	0.04	0.01
Carnivores	0.35	1.04	0.15

Descriptive statistics of nematode abundance (total and per trophic group) recovered from the phytotelma of N_ cruenta_

	Abundance
Statistics	Total	Bacterial feeders	Hyphal feeders	Carnivores
Mean (min–max)	62.8^a (1-534)	30 (1-504)	13.3 (0-201)	14.2 (0-87)
SD	14	15.6	47.7	11
CV%	22.3	52	358.6	77.5

DOI: https://doi.org/10.21307/jofnem-2020-100 | Journal eISSN: 2640-396X | Journal ISSN: 0022-300X

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Language: English

Page range: 1 - 12

Published on: Nov 24, 2020

Published by: Society of Nematologists, Inc.

In partnership with: Paradigm Publishing Services

Publication frequency: 1 issue per year

Keywords:

Freshwater ecosystem,

Nematode trophic structure,

Related subjects:

Life sciences, other

© 2020 Alexandre M. Almeida, Ricardo M. Souza, published by Society of Nematologists, Inc.
This work is licensed under the Creative Commons Attribution 4.0 License.

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