Effects of hydro-electrically induced water level fluctuations on benthic communities in Lake Hawea, New Zealand

Ross Thompson, G. Ryder

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Artificially inducedlake level fluctuations influence benthic communities in numerous lakes, but their effects are relatively poorly understood. Littoral communities were described from three habitat types in two oligotrophic lakes in New Zealand, one subject to a natural hydrological regime with limited lake level fluctuations, the other subject to >5 m fluctuations as a result of hydro-electric management. The fluctuated lake showed evidence of littoral compression and the replacement of macrophyte beds at shallow and intermediate depths by green filamentous algae. Macroinvertebrate biomass was higher in the fluctuated lake, despite this lake having a lower standing crop of primary producers compared with the unfluctuated lake. Disturbance of the littoral zone may reduce macrophyte biomass but may maintain high levels of primary producer productivity through an increase in benthic algae such as diatoms.
Original languageEnglish
Pages (from-to)197-206
Number of pages10
JournalNew Zealand Journal of Marine and Freshwater Research
Volume42
Publication statusPublished - 2008
Externally publishedYes

Fingerprint

benthos
surface water level
water level
lakes
algae
lake
macrophyte
biomass
filamentous alga
hydrological regime
lake level
Bacillariophyceae
green alga
intertidal environment
habitat type
littoral zone
macroinvertebrate
effect
macroinvertebrates
diatom

Cite this

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title = "Effects of hydro-electrically induced water level fluctuations on benthic communities in Lake Hawea, New Zealand",
abstract = "Artificially inducedlake level fluctuations influence benthic communities in numerous lakes, but their effects are relatively poorly understood. Littoral communities were described from three habitat types in two oligotrophic lakes in New Zealand, one subject to a natural hydrological regime with limited lake level fluctuations, the other subject to >5 m fluctuations as a result of hydro-electric management. The fluctuated lake showed evidence of littoral compression and the replacement of macrophyte beds at shallow and intermediate depths by green filamentous algae. Macroinvertebrate biomass was higher in the fluctuated lake, despite this lake having a lower standing crop of primary producers compared with the unfluctuated lake. Disturbance of the littoral zone may reduce macrophyte biomass but may maintain high levels of primary producer productivity through an increase in benthic algae such as diatoms.",
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TY - JOUR

T1 - Effects of hydro-electrically induced water level fluctuations on benthic communities in Lake Hawea, New Zealand

AU - Thompson, Ross

AU - Ryder, G.

PY - 2008

Y1 - 2008

N2 - Artificially inducedlake level fluctuations influence benthic communities in numerous lakes, but their effects are relatively poorly understood. Littoral communities were described from three habitat types in two oligotrophic lakes in New Zealand, one subject to a natural hydrological regime with limited lake level fluctuations, the other subject to >5 m fluctuations as a result of hydro-electric management. The fluctuated lake showed evidence of littoral compression and the replacement of macrophyte beds at shallow and intermediate depths by green filamentous algae. Macroinvertebrate biomass was higher in the fluctuated lake, despite this lake having a lower standing crop of primary producers compared with the unfluctuated lake. Disturbance of the littoral zone may reduce macrophyte biomass but may maintain high levels of primary producer productivity through an increase in benthic algae such as diatoms.

AB - Artificially inducedlake level fluctuations influence benthic communities in numerous lakes, but their effects are relatively poorly understood. Littoral communities were described from three habitat types in two oligotrophic lakes in New Zealand, one subject to a natural hydrological regime with limited lake level fluctuations, the other subject to >5 m fluctuations as a result of hydro-electric management. The fluctuated lake showed evidence of littoral compression and the replacement of macrophyte beds at shallow and intermediate depths by green filamentous algae. Macroinvertebrate biomass was higher in the fluctuated lake, despite this lake having a lower standing crop of primary producers compared with the unfluctuated lake. Disturbance of the littoral zone may reduce macrophyte biomass but may maintain high levels of primary producer productivity through an increase in benthic algae such as diatoms.

KW - lake levels

KW - macrophytes

KW - macroinvertebrates

KW - New Zealand.

M3 - Article

VL - 42

SP - 197

EP - 206

JO - New Zealand Journal of Marine and Freshwater Research

JF - New Zealand Journal of Marine and Freshwater Research

SN - 0028-8330

ER -