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Video ViewAttendees 3

Student 10-Minute Paper

On-Demand

Systematics, Evolution, and Biodiversity

Student Competition

Student

On-Demand Student Competition 10-Minute Papers

(1st Place) Speed in tropical wolf spiders is driven by external temperature rather than the morphological variation of carrying an egg sac

On-Demand
On-Demand Student Competition

Ectothermic animals depend on ambient temperature to regulate internal temperature. This dependence affects many aspects of their behavior, including locomotion, foraging, and reproduction. Additionally, ectotherms are more vulnerable in environments with extreme hourly temperature fluctuations, and their activity patterns likely match those of favorable temperatures. Here, we studied Pardosa wolf spiders (Lycosidae) in the highland tropical paramos of Costa Rica. We tested two hypotheses to elucidate the factors that influence variation in locomotor behavior. First, we tested if locomotor behavior is driven by temperature variation. Female spiders experimentally exposed to higher temperatures (30 °C) moved ~4 times faster than those exposed to lower temperatures (7 °C). Second, we tested if locomotor behavior is modulated by the maternal care strategy of these spiders. Females carry an egg sac externally by holding it with the distal spinnerets. The egg sac can represent up to 36% of the spider's body size. However, females moved at the same speed regardless of whether they carried an egg sac or not. This demonstrates that the maternal care strategy does not affect their locomotor performance. In contrast, temperature plays a crucial role in driving locomotion. Our findings expand our understanding of how temperature fluctuations in extreme environments challenge ectotherms’ ability to move and, by extension, escape predators and locate mates and food.