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

Alexandre M. Almeida
Alexandre M. Almeida
 et 
Ricardo M. Souza
Ricardo M. Souza
   | 24 nov. 2020
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Publié en ligne: 24 nov. 2020
Pages: 1 - 12
DOI: https://doi.org/10.21307/jofnem-2020-100
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© 2020 Alexandre M. Almeida et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1:

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

Figure S1.

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.
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.

Figure 2:

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.
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.

Figure 3:

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

Figure 4:

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.
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 ODa(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) 13.7b (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 194.6aa 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) 62.8a (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
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