This week I had the opportunity to join Dr. Jennifer Smith’s Marine Biology course at Mills College in Oakland, CA. The students, Dr. Smith, and I spent the afternoon talking about how Game Theory can help us understand behavioral interactions in Marine Ecosystems. We had a great time playing “Fighting Eel – Displaying Eel” (Hawk-Dove game) and a Producer – Scrounger game based on algal farming in damselfish. In addition to hearing a lot about many cool marine organisms, the students also learned about Evolutionarily Stable Strategies, and how the costs and benefits impact the outcome of games. We also explored how the order of decisions in sequential games may influence the outcome of games depending on whether or not players have shared interests. On top of it all, we ate a lot of candy!
Dr. Smith has an amazing class. I was honored to get to meet and interact with such a bright group of young scientists and tell them about some of my work on cichlid fishes, as well as the research of several of my colleagues Julie Zill (University of Hawaiʻi at Mānoa), Dr. Michael Gil (University of California, Santa Cruz), and research done by several of my undergraduate students from a Marine Ecology course I co-taught this spring!
The 2018 meeting of the International Society for Behavioral Ecology was a wonderful conference. In addition to hearing about lots of great research, I had the opportunity to catch up with a number of colleagues from current and past projects. I also finally met other researchers from around the world who I’d only known from their research. I got a lot of great feedback on my postdoctoral research, which will undoubtedly improve the forthcoming manuscripts on it.
Minneapolis was a great host city. The venue was convenient, the food was delicious, and we had a great time visiting the Como Park Zoo & Conservatory, the Bell Museum, and catching a Twins game.
Postdoctoral researcher position at Ohio State University
Since my NSF postdoctoral research fellowship ended in July 2018, I’ve begun a postdoctoral researcher position at Ohio State University working with Dr. Ian Hamilton in the Department of Evolution, Ecology, and Organismal Biology. Generally, we’re investigating the robustness and resilience of social networks facing perturbations. While working on this project I’ll be splitting time between Ohio State, UC Davis, and Lake Tanganyika in Zambia for field research on the cichlid fishes there. I spent a few weeks in Columbus following ISBE to meet and train new team members, and set up experiments that will be running this fall. I am now back in Davis until late November.
Team Gambusia Undergrads graduating!
In 2018 six members of Team Gambusia graduated. They’ve moved on to diverse career opportunities including working for government agencies in California, positions at UC Davis, and in industry as environmental consultants. Good luck to all of you!
Before they left, they developed and carried out an experiment of their own on mosquitofish anti-predator behavior. In their spare time are scoring behavioral videos and running hormone assays. They’re doing great work – look for their results in the not too distant future!
I had a wonderful time at the 2018 SICB meeting in San Francisco. As usual, there were plenty of great presentations, and this year there was also a special Editors Challenge workshop on stress. This workshop was one of the highlights of the week for me, in the coming weeks you’ll be able to read a summary, find links to presentation slides, as well as video links to some of the presentations and discussions on the Integrative and Comparative Biology blog which I contribute to.
I had the opportunity to share some new insights on some old questions regarding territory defense in the cichlid fish Neolamprologus pulcher for my talk on Thursday. Additionally, along with recent Team Gambusia and UC Davis graduate Rechelle Viernes, I presented some new results on the behavioral and neuroendocrine impacts of pesticide exposure on the western mosquitofish during Saturday’s poster sessions. Look out for both papers in the not too distant future!
The major goal of my postdoctoral fellowship project is investigating the impacts of human induced rapid environmental changes (HIREC) on natural selection in wild populations. To do so, I’m comparing modern populations of western mosquitofish (Gambusia affinis) to historical populations of fish collected at these same sites. These sites are unique from one another in the extent to which they’ve been influenced by human impacts they’ve faced.
Thus far, I’ve collected fish at each site twice, first in the spring, and again this summer. At each site, my amazing team and I caught fish, photographed them for morphometric analysis, and collected tissue samples from a subset of them for future molecular analysis (look for more info on that in future post!).
In the spring, we were delayed due to near-record rainfall we received this year in California. At one site, we literally couldn’t get within miles of the collection site because of flooded roadways. Eventually, the water receded enough that we could catch the fish in the parking lot at the site.
In spite of the amount of rain winter brought, it was a typical California summer and on our second visit to sites we were working in mid to high 90 degree heat. Finding fish was much easier however, and we only had to return to one site for a second day.
We’re looking forward to seeing and sharing the results of this work!
The rest of SICB was great, as was the rest of the time in New Orleans. The second day of the conference was rainy day, followed by a few unseasonably cold days, so it’s fitting that many of the talks I attended revolved around environmental stressors and measuring their impacts on organisms.
Behavioral and physiological responses to stress – Dr. Kimberly Rosvall, Indiana University
Dr. Rosvall described a study she performed on male Dark Eyed Juncos to understand how they responded to perceived territorial intrusions by other male birds. A common and well-accepted way to bird researchers trick birds into thinking another bird is intruding on their territory is to play audio samples of those birds singing. One experimental group had heard song clips the entire day before samples were taken (persistent social intrusion group), another heard 25 minutes of song before sampling took place (acute social intrusion group); both groups were compared to a control group which heard no songs.
Male birds in both experimental groups sang more than control group birds, indicating that they believed a competing male to be in the area. That males in the persistent social intrusion group sang frequently was interesting because they hadn’t heard a competitor’s song that day; it was a residual effect of the previous day’s songs. Physiologically, males that had heard songs were upregulating genes that indicated they were producing more sperm (a common response in many species to perceived competition over mates). These males that had heard songs also were upregulating particular genes in their brains associated with sending signals from the brain. Most interestingly, the spleens of birds in the persistent social intrusion group had shifted gene expression of genes associated with the immune system, suggesting that there is an actual cost to engaging in competition with other males.
Measuring Hormones in Whale Baleen – Dr. Kathleen Hunt,N. Arizona University
Dr. Hunt studies the hormone levels in baleen whales, but as you can imagine acquiring blood samples from whales can be a bit difficult. One method that is frequently used (but inherently difficult) is to follow whales in a boat and collect fecal samples as they float to the surface. Dr. Hunt described a new method she is utilizing to measure hormone levels in baleen whales – measuring the baleen itself.
Hair samples are used to measure hormones in many animals, and these samples are especially useful because as hair grows, it can give you a historical record of hormone levels over time. Because baleen is a modified hair, Dr. Hunt predicted she could measure hormone levels in baleen. She was correct, and her preliminary findings indicate that a number of hormones can be measured by examining baleen samples. This is especially useful because baleen can represent up to 10 years of the whale’s life, and there are abundant baleen samples in museums around the world!
Alternative Mating Strategies and Parasites – Dr. Susan Balenger, University of Mississippi
Many species have parasites that specialize on them, and often these species evolve adaptations to avoid succumbing to these parasites. A species of cricket that lives on Pacific Islands face a predicament because a parasitic fly that specializes on crickets is attracted to the chirp male crickets use to attract mates. If a male cricket tries to attract mates, he becomes more vulnerable to the parasitic fly laying eggs on him which will eventually hatch and eat his internal organs before erupting out of his body – killing him in the process.
On two Hawaiian Islands, a “flat wing” mutation has emerged in cricket populations leaving them unable to chirp. This mutation is advantageous in that males are less vulnerable to the parasitic fly, but they cannot attract mates. In order to breed, these males are more likely to wander in search of mates. On islands where the parasitic fly is abundant, these “flat wing” males have been very successful and have become more abundant (~95% of males on one Hawaiian Island).
Dr. Balenger raised some of these crickets in environments in which they heard other males chirp, and others without any chirping males. While all of the experimental crickets were capable of chirping, males from islands that had a large number of “flat wing” males were more likely to wander in search of mates if they had been raised without the sound of chirping males. Dr. Balenger attributed this plastic behavioral trait to the evolutionary pressure imposed by the parasitic flies – if there aren’t chirping males, there may be lots of flies and that male may be better off wandering rather than calling.
Lizards and Fire Ants: Effects of Maternal Stress – David Ensminger, Penn State University
Fire Ants are a problematic invasive species in many parts of the world, including the southeastern United States. There they share habitat with the Eastern Fence Lizard. Fire Ants are known to bite, kill, and eat fence lizards (as well as a number of other native species), and pose a real threat to ecosystems which they invade. It is clear that fire ant presence and bites are a stressor for these lizards, but David and his colleagues were interested in whether such stressful situations may have a lasting impact on the offspring of these individuals.
To test this, David collected gravid females and dosed half of them with the stress hormone corticosterone. These females then laid eggs, and David confirmed that indeed some of that corticosterone had transferred into the eggs by testing for its presence in the yolk (it was there). He then let these eggs develop and hatch, and found a number of differences between the experimental and control groups, including that those whose mothers had been stressed had lower corticosterone levels, and were longer than the control lizards. In future studies, David will be investigating whether these changes are beneficial to the offspring, or maladaptive and indicate that fire ants could be problematic for fence lizards.
Some amazing dinner at Gumbo Shop, and great music at Bourbon Maison!