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Aquatic Ecology : Volume 47, Issue 4, December 2013

Microcystins derived from lysing Microcystis cells do not cause negative effects on crustacean zooplankton in Lake Taihu, China

Effects of macrophyte architecture and leaf shape complexity on structural parameters of the epiphytic algal community in a Pampean stream

Depth variation in isotopic composition of benthic resources and assessment of sculpin feeding patterns in an oligotrophic Alaskan lake

Lipid content in 19 brackish and marine microalgae: influence of growth phase, salinity and temperature

No apparent effects of soil inoculum on green frog (Lithobates clamitans Latreille) tadpole performance

Two species of Halimeda, a calcifying genus of tropical macroalgae, are robust to epiphytism by cyanobacteria

Suitability indices and habitat suitability index model of Caspian kutum (Rutilus frisii kutum) in the southern Caspian Sea

Disentangling the roles of spatial and environmental variables in shaping benthic algal assemblages in rivers of central and northern China

Vertical distribution and pigmentation of Antarctic zooplankton determined by a blend of UV radiation, predation and food availability

The tiny mayfly in the room: implications of size-dependent invertebrate taxonomic identification for biomonitoring data properties

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Vertical distribution and pigmentation of Antarctic zooplankton determined by a blend of UV radiation, predation and food availability

Content Provider	Springer Nature Link
Author	Hylander, Samuel Hansson, Lars Anders
Copyright Year	2013
Abstract	Selection pressure induced by simultaneously occurring environmental threats is a major evolutionary driver for organisms in terrestrial, as well as in aquatic ecosystems. For example, protection against ultraviolet radiation (UVR) and predation include both morphological and behavioral components. Here we address those selective pressures on zooplankton by performing a latitudinal monitoring, combined with mechanistic experiments in the Antarctic Southern Ocean, where the UVR-threat is extremely high. We assessed vertical distributions of zooplankton along the Antarctic coast showing that animals were most abundant at 20–80 m and tended to avoid the surface at sites with clear water. UVR-threat disappeared at between 9 and 15 m at sites with low and high water transparency, respectively. Light levels were, however, sufficient for visual fish predation down to approximately 19 and 37 m, respectively. The few zooplankton that were present in surface waters had high levels of non-pigmented UVR-protective compounds (mycosporine-like amino acids) compared to deeper dwelling zooplankton. Overall they had low levels of red pigmented UVR-protective compounds (carotenoids), suggesting high predation on pigmented individuals. In a complementary laboratory study we showed that levels of UVR-protective compounds increased considerably when zooplankton were exposed to UVR in the absence of predator cues. The recently developed transparency-regulator hypothesis predicts that UVR avoidance is an important driver to diel vertical migration in transparent waters, such as in Antarctica. We, however, conclude that copepods resided well below the level where UVR had diminished to very low levels and that predator avoidance or food availability are more likely drivers of zooplankton vertical depth distribution in transparent marine systems.
Starting Page	467
Ending Page	480
Page Count	14
File Format	PDF
ISSN	13862588
Journal	Aquatic Ecology
Volume Number	47
Issue Number	4
e-ISSN	15735125
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-10-02
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Zooplankton Ecology Vertical distribution Carotenoids MAAs Ultraviolet radiation Antarctica Diel vertical migration Freshwater & Marine Ecology Ecosystems
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Ecology, Evolution, Behavior and Systematics

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Vertical distribution and pigmentation of Antarctic zooplankton determined by a blend of UV radiation, predation and food availability

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