NDLI: Using light as a lure is an efficient predatory strategy in Arachnocampa flava, an Australian glowworm

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Using light as a lure is an efficient predatory strategy in Arachnocampa flava, an Australian glowworm

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Using light as a lure is an efficient predatory strategy in Arachnocampa flava, an Australian glowworm

Content Provider	Springer Nature Link
Author	Willis, Robyn E. White, Craig R. Merritt, David J.
Copyright Year	2010
Abstract	Trap-building, sit-and-wait predators such as spiders, flies and antlions tend to have low standard metabolic rates (SMRs) but potentially high metabolic costs of trap construction. Members of the genus Arachnocampa (glowworms) use an unusual predatory strategy: larvae bioluminesce to lure positively phototropic insects into their adhesive webs. We investigated the metabolic costs associated with bioluminescence and web maintenance in larval Arachnocampa flava. The mean rate of CO2 production ( $$ \dot{V}$$ CO2) during continuous bioluminescence was 4.38 μl h−1 ± 0.78 (SEM). The mean $$ \dot{V}$$ CO2 of inactive, non-bioluminescing larvae was 3.49 ± 0.35 μl h−1. The mean $$ \dot{V}$$ CO2 during web maintenance when not bioluminescencing was 8.95 ± 1.78 μl h−1, a value significantly lower than that measured during trap construction by other predatory arthropods. These results indicate that bioluminescence itself is not energetically expensive, in accordance with our prediction that a high cost of bioluminescence would render the Arachnocampa sit-and-lure predatory strategy inefficient. In laboratory experiments, both elevated feeding rates and daily web removal caused an increase in bioluminescent output. Thus, larvae increase their investment in light output when food is plentiful or when stressed through having to rebuild their webs. As light production is efficient and the cost of web maintenance is relatively low, the energetic returns associated with continuing to glow may outweigh the costs of continuing to attract prey.
Starting Page	477
Ending Page	486
Page Count	10
File Format	PDF
ISSN	01741578
Journal	Journal of Comparative Physiology B
Volume Number	181
Issue Number	4
e-ISSN	1432136X
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-12-07
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metabolic rate Bioluminescence Web Silk Sit-and-wait predator Human Physiology Biochemistry Animal Physiology Zoology Biomedicine general
Content Type	Text
Resource Type	Article
Subject	Physiology Biochemistry Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Endocrinology

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Using light as a lure is an efficient predatory strategy in Arachnocampa flava, an Australian glowworm

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Using light as a lure is an efficient predatory strategy in Arachnocampa flava, an Australian glowworm

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Using light as a lure is an efficient predatory strategy in Arachnocampa flava, an Australian glowworm