Diatomáceas de sedimentos superficiais e fitoplanctônicas ao longo de um gradiente trófico em reservatórios tropicais: novos registros para o Brasil e Estado de São Paulo

Bartozek, Elaine Cristina Rodrigues; Zorzal-Almeida, Stéfano; Bicudo, Denise C.

doi:10.1590/2236-8906-51/2017

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ARTICLES • Hoehnea 45 (1) • Mar 2018 • https://doi.org/10.1590/2236-8906-51/2017 copiar

Diatomáceas de sedimentos superficiais e fitoplanctônicas ao longo de um gradiente trófico em reservatórios tropicais: novos registros para o Brasil e Estado de São Paulo

Autoria SCIMAGO INSTITUTIONS RANKINGS

RESUMO

Este estudo visou inventariar a flora diatomológica de represas tropicais em condições oligo- a hipereutróficas da região sudeste do Brasil. As amostras abrangeram diatomáceas do sedimento superficial e fitoplâncton (verão e inverno) em 41 locais (dez represas). Setenta e oito táxons, distribuídos em 28 gêneros, foram identificados nas amostras de sedimento superficial e fitoplanctônicas. Nitzschia foi o gênero mais representativo, com um total de nove espécies. Seis táxons representam novas citações para o Brasil e seis para o Estado de São Paulo; dez táxons foram identificados em nível de gênero e provavelmente representam novas espécies. Adicionalmente, este estudo contribuiu com informações sobre a ecologia dessas espécies e permite enfatizar a necessidade de estudos florísticos para ampliar o conhecimento da biodiversidade de diatomáceas tropicais.

Palavras-chave:
biodiversidade; ecologia; flora diatomológica

Watershed	Reservoirs	Sampling sites	Coordinates	Number of samples
Alto Tietê	Paiva Castro (oligotrophic)	PC1	S 23º 19' 30" W 46º 36' 03"	01 SS 02 P
		PC2	S 23º 19' 44" W 46º 38' 12"	01 SS 02 P
		PC3	S 23º 20' 08W 46º 39' 39"	01 SS 02 P
		PC4	S 23º 19' 55" W 46º 40' 35"	01 SS 02 P
Médio Tietê and Alto Sorocaba	Santa Helena (oligotrophic)	SH1	S 23º 34' 50" W 47º 25' 32"	01 SS 02 P
		SH2	S 23º 34' 58" W 47º 25' 50"	01 SS 02 P
		SH3	S 23º 34' 54" W 47º 26' 12"	01 SS 02 P
	Itupararanga (mesotrophic)	IT1	S 23º 37' 11" W 47º 13' 59"	01 SS 02 P
		IT2	S 23º 36' 52" W 47º 18' 5"	01 SS 02 P
		IT3	S 23º 37' 13" W 47º 19' 37"	01 SS 02 P
		IT4	S 23º 38' 0.3" W 47º 22' 14"	01 SS 02 P
		IT5	S 23º 36' 53" W 47º 23' 35"	01 SS 02 P
	Ipaneminha (mesotrophic)	IP1	S 23º 32' 34" W 47º 30' 57"	01 SS 02 P
		IP2	S 23º 32' 38" W 47º 31' 4"	01 SS 02 P
		IP3	S 23º 32' 34" W 47º 31' 9"	01 SS 02 P
	Hedberg (eutrophic)	HB1	S 23º 25' 56" W 47º 35' 33"	01 SS 02 P
		HB2	S 23º 25' 41" W 47º 35' 31"	01 SS 02 P
		HB3	S 23º 25' 34" W 47º 35' 42"	01 SS 02 P
	Barra Bonita (hypereutrophic)	BB1	S 22º 38' 9" W 48º 21' 11"	01 SS 02 P
		BB2	S 22º 36' 42" W 48º 19' 15"	01 SS 02 P
		BB3	S 22º 36' 9" W 48º 21' 16"	01 SS 02 P
Médio Tietê and Alto Sorocaba	Barra Bonita (hypereutrophic)	BB4	S 22º 34' 9" W 48º 24' 31"	01 SS 02 P
Médio Tietê and Alto Sorocaba	Barra Bonita (hypereutrophic)	BB5	S 22º 31' 56" W 48º 27' 37"	01 SS 02 P
Piracicaba, Capivari and Jundiaí	Atibainha (oligotrophic)	AT1	S 23º 08' 50" W 46º 18' 50"	01 SS 02 P
		AT2	S 23º 09' 42" W 46º 21' 44"	01 SS 02 P
		AT3	S 23º 11' 11" W 46º 22' 51"	01 SS 02 P
		AT4	S 23º 10' 31" W 46º 23' 29"	01 SS 02 P
		AT5	S 23º 12' 46" W 46º 22' 54"	01 SS 02 P
		AT6	S 23º 10' 46" W 46º 21' 25"	01 SS 02 P
	Cachoeira (oligotrophic)	CA1	S 23º 00' 06" W 46º 16' 05"	01 SS 02 P
		CA2	S 23º 00' 37" W 46º 17' 11"	01 SS 02 P
		CA3	S 23º 01' 56" W 46º 17' 20"	01 SS 02 P
		CA4	S 23º 03' 00" W 46º 19' 07"	01 SS 02 P
		CA5	S 23º 04' 11" W 46º 18' 41"	01 SS 02 P
	Tatu (mesotrophic)	TU1	S 22º 38' 45" W 47º 17' 09"	01 SS 02 P
		TU2	S 22º 39' 17" W 47º 17' 01"	01 SS 02 P
		TU3	S 22º 39' 36" W 47º 16' 45"	01 SS 02 P
	Salto Grande (eutrophic)	SG1	S 22º 43' 43" W 47º 13' 56"	01 SS 02 P
		SG2	S 22º 42' 59" W 47º 14' 26"	01 SS 02 P
		SG3	S 22º 43' 05" W 47º 16' 02"	01 SS 02 P
		SG4	S 22º 42' 04" W 47º 16' 51"	01 SS 02 P

Variables	Summer		Standard deviation	Winter		Standard deviation
Variables	Range	Mean	Standard deviation	Range	Mean	Standard deviation
Depth (m)	2.0-24.0	10.7	5.8	1.5-25.2	11.0	6.3
Secchi (m)	0.3-3.2	1.2	0.8	0.4-2.9	1.5	0.6
Temp (ºC)	21.0-29.7	25.7	1.9	11.4-26.1	17.8	3.7
pH	5.8-9.6	7.2	1.0	6.2-9.5	7.2	0.9
Cond (µS cm^-1)	18.0-361.0	114.1	98.5	38.0-481.0	151.3	139.9
DO (mg L^-1)	3.7-12.7	6.3	1.7	2.4-12.2	7.6	1.8
DIN (µg L^-1)	23.0-4968.0	536.6	1066.0	69.5-7548.2	811.8	1362.1
TN (µg L^-1)	67.0-9859.1	1337.9	2262.5	145.9-8136.6	1307.5	1500.1
PO₄ (µg L^-1)	4.0-90.0	12.8	17.6	4.0-428.1	32.3	74.7
TP (µg L^-1)	6.9-567.7	68.4	124.8	6.5-590.6	77.3	124.9
SRS (mg L^-1)	2.6-6.6	3.8	0.9	1.0-5.7	3.5	1.6
Chl-α (µg L^-1)	0.9-363.9	32.2	66.5	0.5-518.5	38.9	92.9
Trophic State Index (TSI)	48.2-72.8	56.0	7.1	45.7-75.3	55.8	8.2

Species	Oligotrophic			Mesotrophic			Eutrophic
Species	f	min	max	f	min	max	f	min	max
Achnanthidium catenantum (Bily & Marvan) Lange-Bertalot	68.0	0.00	18.38	60.0	0.00	15.31	42.1	0.0	13.6
Achnanthidium exiguum (Grunow) Czarnecki	50.0	0.00	26.80	20.0	0.00	25.58	5.3	0.0	0.2
*Achnanthidium jackii Rabenhorst	76.0	0.00	6.57	37.1	0.00	6.84	34.2	0.0	24.7
*Achnanthidium lineare Smith	-	-	-	14.3	0.00	6.47	5.3	0.0	0.8
**Achnanthidiumcf. macrocephalum (Hustedt) Round & Bukhtiyarova	30.0	0.00	2.58	20.0	0.00	3.00	13.2	0.0	17.1
Achnanthidium minutissimum (Kützing) Czarnecki	72.0	0.00	17.33	71.4	0.00	22.93	31.6	0.0	3.4
Achnanthidium tropicocatenatum Marquardtet al.	-	-	-	11.4	0.00	44.04	10.5	0.0	2.9
Achnanthidium sp.	2.0	0.00	0.97	17.1	0.00	6.28	5.3	0.0	0.9
Asterionella formosa Hassal	-	-	-	2.9	0.00	0.21	13.2	0.0	2.3
Aulacoseira ambigua (Grunow) Simonsen	96.0	0.00	20.90	97.1	0.00	44.05	86.8	0.0	63.6
Aulacoseira calypsi Tremarin et al.	2.0	0.00	0.44	14.3	0.00	4.05	5.3	0.0	1.1
Aulacoseira granulata var. angustissima (Müller) Simonsen	84.0	0.00	8.27	91.4	0.00	47.23	97.4	0.0	64.0
Aulacoseira granulata var. granulata (Ehrenberg) Simonsen	82.0	0.00	15.42	85.7	0.00	22.43	94.7	0.0	88.4
Aulacoseira herzogii (Lemmermann) Simonsen	4.0	0.00	0.94	14.3	0.00	1.22	18.4	0.0	2.5
Aulacoseira tenella (Nygaard) Simonsen	90.0	0.00	83.95	28.6	0.00	34.24	18.4	0.0	18.9
Aulacoseria veraluciae Tremarin et al.	-	-	-	-	-	-	2.6	0.0	2.1
Brachysira brebissonii Ross	-	-	-	-	-	-	2.6	0.0	3.1
Brachysira microcephala (Grunow) Compère	52.0	0.00	3.84	37.1	0.00	3.46	23.7	0.0	2.0
Brashysira sp.	16.0	0.00	5.28	5.7	0.00	0.75	-	-	-
Cyclotella meneghiniana Kützing	26.0	0.00	1.23	57.1	0.00	3.62	89.5	0.0	68.5
**Cymbella affinisvar. neoprocera Silva	2.0	0.00	0.40	22.9	0.00	6.91	10.5	0.0	0.9
Cymbopleura naviculiformis (Auerswald ex Heiberg) Krammer	2.0	0.00	0.40	22.9	0.00	3.08	5.3	0.0	1.1
Diadesmis confervaceaKützing	4.0	0.00	0.67	14.3	0.00	7.45	34.2	0.0	8.5
Discostella pseudostelligera (Hustedt) Houk & Klee	10.0	0.00	48.95	17.1	0.00	46.80	15.8	0.0	9.5
Discostella stelligera (Cleve & Grunow) Houk & Klee	100.0	0.60	65.92	97.1	0.00	91.99	73.7	0.0	33.4
Encyonema silesiacum (Bleisch) Mann	60.0	0.00	7.11	28.6	0.00	5.49	18.4	0.0	3.0
Encyonema sp.	26.0	0.00	2.19	5.7	0.00	2.49	-	-	-
*Encyonopsis thienemannii (Hustedt) Krammer	4.0	0.00	3.63	5.7	0.00	0.98	-	-	-
Eunotia botulitropica Wetzel & Costa	48.0	0.00	5.74	28.6	0.00	17.65	15.8	0.0	2.6
Eunotia desmogonioides Metzeltin & Lange-Bertalot	-	-	-	2.9	0.00	4.41	-	-	-
Eunotia intricans Lange-Bertalot & Metzeltin	32.0	0.00	4.38	37.1	0.00	28.64	5.3	0.0	2.3
Eunotialongicamelus Costa et al.	14.0	0.00	18.78	17.1	0.00	3.67	-	-	-
Eunotia meridiana Metzeltin & Lange-Bertalot	12.0	0.00	2.29	5.7	0.00	2.00	-	-	-
Fragilaria aquaplus Lange-Bertalot & Ulrich	4.0	0.00	1.62	14.3	0.00	2.29	15.8	0.0	18.2
Fragilaria crotonensis Kitton	24.0	0.00	2.75	11.4	0.00	2.73	2.6	0.0	0.4
*Fragilaria grunowii Lange-Bertalot & Ulrich	4.0	0.00	1.20	37.1	0.00	2.73	21.1	0.0	4.5
Fragilaria longifusiformis (Hains & Sebring)Siver et al.	16.0	0.00	9.00	31.4	0.00	12.27	13.2	0.0	14.1
Fragilaria parva (Grunow) Tuji & Williams	10.0	0.00	0.98	5.7	0.00	8.96	-	-	-
Fragilaria spectra Almeida et al.	4.0	0.00	19.45	22.9	0.00	38.18	10.5	0.0	46.4
**Fragilaria teneravar. nanana (Lange-Bertalot) Lange-Bertalot & Ulrich	-	-	-	25.7	0.00	30.42	7.9	0.0	26.5
Fragilaria sp.	22.0	0.00	7.52	20.0	0.00	18.36	-	-	-
Geissleria punctifera (Hustedt) Metzeltin et al.	12.0	0.00	2.99	2.9	0.00	0.21	-	-	-
Geissleria lateropunctata (Wallace) Potapova & Winter	42.0	0.00	7.65	20.0	0.00	1.49	-	-	-
Gomphonema hawaiense Reichardt	16.0	0.00	0.74	11.4	0.00	1.33	5.3	0.0	2.0
Gomphonema lagenula Kützing	40.0	0.00	1.50	34.3	0.00	11.03	21.1	0.0	3.2
**Gomphonema naviculoides Smith	10.0	0.00	2.94	14.3	0.00	2.49	-	-	-
Gomphonema parvulum (Kützing) Kützing	10.0	0.00	2.06	5.7	0.00	3.23	5.3	0.0	0.3
Hantzschia amphioxys (Ehrenberg) Grunow	4.0	0.00	1.96	5.7	0.00	3.46	-	-	-
Humidophila contenta (Grunow) Lowe	58.0	0.00	8.37	40.0	0.00	3.63	18.4	0.0	2.8
Navicula cryptocephala Kützing	6.0	0.00	1.72	34.3	0.00	14.38	10.5	0.0	18.1
Navicula cryptotenella Lange-Bertalot	4.0	0.00	1.36	20.0	0.00	5.65	10.5	0.0	1.7
Navicula kuseliana Lange-Bertalot & Rumrich	8.0	0.00	2.67	14.3	0.00	5.80	5.3	0.0	0.5
Navicula neomundana (Lange-Bertalot & Rumrich) Lange-Bertalot et al.	42.0	0.00	7.00	11.4	0.00	1.75	-	-	-
Navicula notha Wallace	94.0	0.00	19.73	54.3	0.00	18.20	31.6	0.0	7.1
Navicula rostellata Kützing	4.0	0.00	0.40	25.7	0.00	12.92	21.1	0.0	7.9
Navicula symmetrica Patrick	4.0	0.00	2.00	-	-	-	-	-	-
Nitzschia amphibia Grunow	-	-	-	2.9	0.00	0.25	18.4	0.0	2.7
Nitzschia gracilis Hantzch	4.0	0.00	2.59	20.0	0.00	2.07	5.3	0.0	0.4
Nitzschia palea (Kützing) Smith	38.0	0.00	3.19	37.1	0.00	2.99	42.1	0.0	83.1
Nitzschia palea var. debilis (Kützing) Grunow	28.0	0.00	2.25	8.6	0.00	1.50	-	-	-
**Nitzschia perminuta (Grunow) Peragallo	8.0	0.00	2.04	-	-	-	-	-	-
*Nitzschia semirobusta Lange-Bertalot	74.0	0.00	2.18	20.0	0.00	2.24	-	-	-
*Nitzschia* sp. 1	-	-	-	25.7	0.00	7.06	13.2	0.0	4.9
Nitzschia sp. 2	4.0	0.00	0.33	11.4	0.00	20.25	-	-	-
Nitzschia sp. 3	-	-	-	-	-	-	18.4	0.0	12.0
**Placoneis exigua (Gregory) Mereschkovsky	-	-	-	-	-	-	5.7	0.0	3.7
Planothidium rostratum (Østrup) Lange-Bertalot	6.0	0.00	0.44	42.9	0.00	11.46	5.3	0.0	1.9
Pseudostaurosira brevistriata (Grunow) Williams & Round	20.0	0.00	2.30	17.1	0.00	2.47	-	-	-
Pseudostaurosira sp.	2.0	0.00	2.43	37.1	0.00	2.42	21.1	0.0	3.8
Punctastriata lancettula (Schumann) Hamilton & Siver	8.0	0.00	73.97	25.7	0.00	81.84	5.3	0.0	0.9
Rimoneis sp.	6.0	0.00	2.63	20.0	0.00	6.94	5.3	0.0	2.1
Sellaphora nigri (De Notaris) Wetzel & Ector	4.0	0.00	2.46	-	-	-	-	-	-
*Sellaphora rostrata (Hustedt) Johansen	14.0	0.00	1.47	17.1	0.00	5.43	2.6	0.0	0.2
Sellaphora sassiana (Metzeltin & Lange-Bertalot) Wetzel	40.0	0.00	3.58	14.3	0.00	9.48	-	-	-
Spicaticribra kingstonii Johansen et al.	82.0	0.00	67.17	42.9	0.00	5.99	26.3	0.0	5.5
Staurosirella sp.	4.0	0.00	0.40	34.3	0.00	3.92	13.2	0.0	3.7
Ulnaria acus (Kützing) Aboal	8.0	0.00	0.65	17.1	0.00	2.67	18.4	0.0	3.9

Species	Surface sediment		Summer phytoplankton		Winter phytoplankton
Species	Min	Max	Min	Max	Min	Max
Achnanthidium catenantum (Bily & Marvan) Lange-Bertalot	0.00	18.38	0.00	8.73	0.00	13.57
Achnanthidium exiguum (Grunow) Czarnecki	-	-	0.00	26.80	0.00	25.58
*Achnanthidium jackii Rabenhorst	0.00	5.66	0.00	24.69	0.00	10.04
*Achnanthidium lineare Smith	0.00	6.47	-	-	-	-
***Achnanthidium cf. macrocephalum*** (Hustedt) Round & Bukhtiyarova	-	-	0.00	2.58	0.00	17.10
Achnanthidium minutissimum (Kützing) Czarnecki	0.00	13.24	0.00	19.85	0.00	22.93
Achnanthidium tropicocatenatum Marquardt et al.	-	-	0.00	2.95	0.00	44.04
Achnanthidium sp.	0.00	6.28	-	-	0.00	0.86
Asterionella formosa Hassal	0.00	2.01	-	-	0.00	2.33
Aulacoseira ambigua (Grunow) Simonsen	0.21	63.56	0.00	26.93	0.00	44.42
Aulacoseira calypsi Tremarin et al.	0.00	4.05	0.00	0.68	0.00	0.48
Aulacoseira granulata var. angustissima (Müller) Simonsen	0.21	63.74	0.00	33.92	0.00	63.99
Aulacoseira granulata var. granulata (Ehrenberg) Simonsen	0.00	51.64	0.00	19.90	0.00	88.36
Aulacoseira herzogii (Lemmermann) Simonsen	0.00	2.47	0.00	0.94	0.00	1.22
Aulacoseira tenella (Nygaard) Simonsen	0.00	54.72	0.00	38.40	0.00	83.95
Aulacoseria veraluciae Tremarin et al.	-	-	0.00	2.07	-	-
Brachysira brebissonii Ross	-	-	-	-	0.00	3.11
Brachysira microcephala (Grunow) Compère	0.00	3.46	0.00	3.84	0.00	2.67
Brashysira sp.	0.00	5.28	-	-	-	-
Cyclotella meneghiniana Kützing	0.00	40.74	0.00	36.10	0.00	68.47
**Cymbella affinisvar. neoprocera Silva	0.00	6.91	0.00	0.45	0.00	0.50
Cymbopleura naviculiformis (Auerswald ex Heiberg) Krammer	0.00	3.08	0.00	0.95	0.00	1.39
Diadesmis confervacea Kützing	0.00	7.45	0.00	3.23	0.00	8.46
Discostella pseudostelligera (Hustedt) Houk & Klee	-	-	0.00	48.95	0.00	6.51
Discostella stelligera (Cleve & Grunow) Houk & Klee	0.00	49.88	0.00	91.99	0.00	73.15
Encyonema silesiacum (Bleisch) Mann	0.00	7.11	0.00	2.29	0.00	3.67
Encyonema sp.	0.00	2.19	0.00	2.49	0.00	1.11
*Encyonopsis thienemannii (Hustedt) Krammer	-	-	0.00	0.45	0.00	3.63
Eunotiabotulitropica Wetzel & Costa	0.00	2.55	0.00	17.65	0.00	5.74
Eunotia desmogonioides Metzeltin & Lange-Bertalot	-	-	0.00	4.41	-	-
Eunotia intricans Lange-Bertalot & Metzeltin	0.00	28.64	0.00	1.50	0.00	3.33
Eunotialongicamelus Costa et al.	0.00	2.49	0.00	18.78	0.00	3.67
Eunotia meridiana Metzeltin & Lange-Bertalot	-	-	0.00	2.29	0.00	0.50
Fragilaria aquaplus Lange-Bertalot & Ulrich	0.00	18.23	0.00	5.80	0.00	11.63
Fragilaria crotonensis Kitton	-	-	0.00	2.75	0.00	0.37
*Fragilaria grunowiiLange-Bertalot & Ulrich	0.00	2.70	0.00	2.73	0.00	4.46
Fragilaria longifusiformis (Hains & Sebring) Siver et al.	0.00	7.80	0.00	14.08	0.00	1.86
Fragilaria parva (Grunow) Tuji & Williams	0.00	8.96	-	-	-	-
Fragilaria spectra Almeida et al.	-	-	0.00	46.38	0.00	0.96
**Fragilaria teneravar. nanana (Lange-Bertalot) Lange-Bertalot & Ulrich	0.00	3.93	0.00	3.62	0.00	30.42
Fragilaria sp.	0.00	4.98	0.00	18.36	0.00	17.33
Geissleria punctifera (Hustedt) Metzeltin et al.	-	-	0.00	1.17	0.00	2.99
Geissleria lateropunctata (Wallace) Potapova & Winter	0.00	3.27	0.00	1.88	0.00	7.65
Gomphonema hawaiense Reichardt	-	-	0.00	1.33	0.00	2.00
Gomphonema lagenula Kützing	0.00	1.96	0.00	11.03	0.00	1.48
**Gomphonema naviculoidesSmith	0.00	2.94	0.00	2.33	0.00	0.67
Gomphonema parvulum (Kützing) Kützing	0.00	3.23	-	-	-	-
Hantzschia amphioxys (Ehrenberg) Grunow	0.00	3.46	-	-	-	-
Humidophila contenta (Grunow) Lowe	0.00	2.78	0.00	8.37	0.00	3.32
Navicula cryptocephala Kützing	0.00	4.94	0.00	1.47	0.00	18.10
Navicula cryptotenella Lange-Bertalot	0.00	5.65	-	-	0.00	4.85
Navicula kuseliana Lange-Bertalot & Rumrich	0.00	5.80	0.00	1.20	0.00	2.67
Navicula neomundana (Lange-Bertalot & Rumrich) Lange-Bertalot et al.	0.00	7.00	0.00	1.79	0.00	2.99
Navicula notha Wallace	0.00	13.13	0.00	19.73	0.00	7.80
Navicula rostellata Kützing	0.00	2.55	0.00	3.30	0.00	12.92
Navicula symmetrica Patrick	0.00	2.00	-	-	-	-
Nitzschia amphibia Grunow	-	-	0.00	2.24	0.00	2.74
Nitzschia gracilis Hantzch	-	-	0.00	2.59	-	-
Nitzschia palea (Kützing) Smith	0.00	3.19	0.00	83.06	0.00	5.50
Nitzschia palea var. debilis (Kützing) Grunow	-	-	0.00	2.25	0.00	0.33
**Nitzschia perminuta(Grunow) Peragallo	0.00	2.04	-	-	-	-
*Nitzschia semirobusta Lange-Bertalot	0.00	2.18	0.00	2.24	0.00	1.00
Nitzschia sp. 1	0.00	7.06	0.00	1.23	0.00	1.11
Nitzschia sp. 2	0.00	20.25	-	-	0.00	3.32
Nitzschia sp. 3	-	-	0.00	4.04	0.00	12.00
**Placoneis exigua (Gregory) Mereschkovsky	0.00	3.73	0.00	0.49	-	-
Planothidium rostratum(Østrup) Lange-Bertalot	0.00	11.46	0.00	1.77	0.00	2.29
Pseudostaurosira brevistriata (Grunow) Williams & Round	0.00	2.47	0.00	0.72	0.00	0.97
Pseudostaurosira sp.	0.00	2.97	0.00	3.77	0.00	1.46
Punctastriata lancettula (Schumann) Hamilton & Siver	0.00	81.84	0.00	23.49	0.00	15.87
Rimoneis sp.	0.00	6.94	0.00	0.45	0.00	1.39
Sellaphora nigri (De Notaris) Wetzel & Ector	0.00	2.46	-	-	-	-
*Sellaphora rostrata(Hustedt) Johansen	0.00	5.43	0.00	0.25	0.00	2.66
Sellaphora sassiana (Metzeltin & Lange-Bertalot) Wetzel	0.00	3.58	0.00	9.48	0.00	0.33
Spicaticribra kingstonii Johansen et al.	0.00	67.17	0.00	12.56	0.00	3.23
Staurosirella sp.	0.00	3.92	0.00	2.36	0.00	1.49
Ulnaria acus (Kützing) Aboal	-	-	0.00	2.67	0.00	3.89

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[1] 3Corresponding author: elaine.bartozek@gmail.com