Zooplankton in lakes and grazing

1
Zooplankton in lakes and grazing

• AWER 4500
• 23 April 2007

2
Importance of zooplankton

• Grazers
• Nutrient recycling
• As fish food

3
Classifications and groups of zooplankton

• Protozoa
• Part of microbial loop
• Ciliates and heterotrophic nanoflagellates

4
Spatial segregation of protozoa
5
Classifications and groups of zooplankton

• Rotifers

http//images.google.com/imgres?imgurlhttp//bill
.srnr.arizona.edu/classes/182/Rotifers.jpegimgref
urlhttp//bill.srnr.arizona.edu/classes/182/Rotif
er.htmh480w640sz49hlenstart6tbnidG3QvB
9ql2uA3NMtbnh103tbnw137prev/images3Fq3Dro
tifers26gbv3D226svnum3D1026hl3Den26sa3DG
6
Rotifer Feeding With Corona Cilia
7
Rotifer Diversity
8
Crustacean zooplankton(1) Cladocera
0.7 mm

• Ceriodaphnia reticulata

9
Filter feeding by cladocera
SETAE
10
Crustacean filter feeders
0.5 um
0.5 mm
Typical filtration rates of 25 ml / individual /
day
11
Brine shrimp
Filtering Limb
Typical filtration rates of 300 ml / individual
/ day If 4 Artemia / liter 4 300 ml/L
1.2 L/L/day 120 / day
10 mm
12
Feeding rate dependant on algal food
concentration up to a point
Feeding rate of Daphnia (W. Lampert)
13
(No Transcript)
14
(No Transcript)
15
Cladoceran life history
Parthenogenic
16
Crustacean Zooplankton (2) Copepods
http//micro.magnet.fsu.edu/featuredmicroscopist/v
anegmond/images/copepodsmall.jpg
http//tidepool.st.usm.edu/pix/biginfectedacartia.
jpg
17
Copepod morphology
Cyclopoid
Calanoid
18
Copepod Life Cycle
Calanoid
Cyclopoid
19
Instar development of cyclopoid copepod
Nauplii
Copepodids
Adults
20
Insects

• Chaeoborous Phantom Midge!

Larvae Length 10 mm
Pupae