Field Notes: The Polar Field Services Newsletter

Meet Team Spider

“Being at Toolik is one of greatest experiences a science teacher can have. Every researcher I worked with loved helping me figure out how to implement their science into my classroom. There are people studying lots of different things and they were all so welcoming to my questions and participation. The scientists working at Toolik were some of the hardest working people I’ve ever encountered. Everyone maximizes their time and has a lot of fun in the process.”—PolarTREC teacher, Nick LaFave

Meet Team Spider

Team Spider (Kiki Contreras, Amanda Koltz, and Nick LaFave) enjoying a day off in Atigun Valley near Toolik Field Station. All photos: Nick LaFave

This summer teacher Nick LaFave expanded his knowledge of habitats and community ecology as part of PolarTREC (Teachers and Researchers Exploring and Collaborating). The program pairs K-12 teachers with polar scientists for field research in the Polar Regions. Teachers typically spend two to six weeks working with researchers while reporting on their experience to students and community via the internet and satellite phone. LaFave spent six weeks working alongside ecologist Amanda Koltz and research assistant, Kiki Contreras (Duke University), at Toolik Field Station studying wolf spiders, the tundra’s most abundant invertebrate predator. The team is studying wolf spiders in order to better understand the ways in which the Arctic food web may change in response to a warming climate.

Female Wolf Spider

A penny-sized female wolf spider shows off her blue egg sac.

“In terms of biomass, there are 30-40 times more wolf spiders than wolves!” says LaFave, who teaches Environmental Science on Clover High School’s nearly 100-acre outdoor education area in Clover, South Carolina. “With climate warming, Arctic growing seasons are becoming longer and, consequently, body sizes in Greenland wolf spiders are becoming larger. We are studying wolf spiders in the Alaskan Arctic to see if they are changing in the same way because, if they are becoming larger, they could be having more offspring and the growth of populations could change. This could lead to other changes in Arctic food webs.”

Team Spider looked at wolf spider distribution in three locations. The primary site consisted of five plots located about a 10 minute walk from Toolik. In each plot six aluminum rings, each 1.5m in diameter, were buried several inches in the tundra to corral spiders and their surrounding ecosystems. Scientists then control and change variables (like the number of spiders and the temperature by way of ring-sized open top greenhouses) in each ring and compare ecosystem changes. Each ring is outfitted with three spider pitfall traps (a plastic cup) set into the soil, a temperature sensor, and soil nutrient probes. Soil temperature and moisture are also recorded. Screens placed over top of other plastic cups allowed Team Spider to catch and catalog other critters living in the plots that are likely wolf spider prey.

Nick LaFave measures soil temperature and moisture content in a Team Spider mesochasm.

The team also took soil samples, referred to as “tundra cake” from their plots. Back in the Toolik field lab, soil samples were weighed and placed in large funnels in five gallon buckets with lights placed over top. Heat from the lights drove organisms downward and out into the bucket. In this way, Team Spider discovered arthropods living in the top few inches of tundra.

Tundra cake

Tundra cake looks (almost) good enough to eat!

Plots in Atigun River Gorge provide a contrast to the Toolik plots because snow melts about a month earlier than at Toolik. The team hopes to learn how a longer growing season affects wolf spider populations.  Here the team laid out a 10m x 10m grid and placed a pitfall trap into the soil at every meter. Cups were collected 24 hours later and brought back to the lab and counted for total abundance, different species, females, and females with eggs. Similar experiments were also run at Imnavait Creek Research Site where snow melts a couple of weeks later than at Toolik (a shorter growing season).

“We tried to get as much of and as many different kinds of data as possible. The variability between our three areas really blew me away because they were not a great distance apart,” says LaFave. “Wolf spiders live mostly on the surface, at least in the summer, but not much is known about how they winter over. Some scientists think they might have some kind of antifreeze proteinds in their blood. Others think maybe they live under deeper snowpack where it’s warmer. So that remains a big unknown.”

Looking for critters in the microscopes

Amanda Koltz and Kiki Contreras have a look-see back in the Toolik lab.

Now back in South Carolina at the start of a new school year, LaFave is still developing activities from nearly every research group he talked with while at Toolik to integrate into his classes. He plans to take his Advanced Placement class to visit Koltz’s lab following her visit to work with his class as they establish some ongoing monitoring projects at Clover High.

“Wolf spiders really are everywhere – different species live all over North America, even South Carolina – the wolf spider is the South Carolina state spider! So, it will be fun to recreate our Toolik field study here at Clover High,” says LaFave.

LaFave also plans to share his experience with a number of area community groups.“The community really supports our outdoor classrooms. Not only do I teach science classes where students do real, hands-on field science, but art and English classes utilize the space as well. It’s very special,” says LaFave. “We’re all playing in the woods, but learning, too.”—Marcy Davis

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