Geoscience Reference
In-Depth Information
Fig. 11.8
The distribution of main ecological groups in core ZG 345580-11 (11-16 cm)
1. Allochthonous diatoms typical for acid dystrophic waters, represented by
Eunotia bilunaris
,
Tabellaria flocculosa
, and
Pinnularia
spp. - the most common
species.
2. Autochthonous diatoms inhabiting waters rich in dissolved nutrients and organic
matter, with low oxygen content. This group is represented by euryhaline
forms
Amphora copulata
,
Cocconeis neodiminuta
,
C. placentula
var.
lineata
,
C. placentula
var.
euglypta
,
Cavinula scutelloides
,
Cymbella cistula
,
Diatoma
vulgaris
,
Fragilaria martyi
,
Gomphonema acuminatum
,
G. angustatum
,
G. trun-
catum
,
Navicula oblonga
,
Pseudostaurosira brevistriata
,
Rhopalodia gibba
,
Staurosira construens
and
Ulnaria ulna.
Except for the latter species, these taxa
have high potential of preservation.
Moreover, benthic allochthonous forms preferring more saline water were also
Fig. 11.9
The frequency of main diatoms belonging to a group of brackish-marine benthos in core
ZG 345580-11 (11-16 cm)
