Week 2 - Nudibranchs, and Molluscs, and Crabs, Oh My!

Monday, April 8

We started this week off by going out to several spots on the mud flats around the HMSC campus and helping Dr. Sylvia Yamada collect and record captured Carcinus maenas, and five other species of crabs including Cancer magister, Cancer antennarius, Cancer productus, Hemigrapsus nudus, and Hemigrapsus oregonensis. We collected eight traps by the pump house docks that had been placed over the weekend. After taking record of the species we found there, any C. maenas were kept for Marine Science Day and all other species were released. We then headed to the exposed mudflats near the aquarium where we collected about 20 traps of three different types. A couple of the traps had fish in them, and some had as many as eight C. maenas. The exciting find was a Cancer magister that had molted in one of our traps. The size difference between the crab and its molted exoskeleton was significant. The reason for this change in size is a process known as ecdysis, during which they form a new exoskeleton beneath their old one, absorb nutrients and minerals from their old exoskeleton, then back out of their old shell and then swell with water while their bodies are soft. This leaves them vulnerable until their carapace hardens. Lucky for this little guy, we found him and meant him no harm.

Tuesday, April 9

Unfortunately, our hike to Cascade Head was cancelled after being postponed due to inclement weather. Instead of this trip, we decided to get through our last two lectures on the Phyla Echinodermata and Chordata. We were then given the rest of the day to study for the upcoming finals and work on our “favorite marine invertebrate” papers and presentations.

Wednesday, April 10

First thing in the morning we had donuts and coffee with the staff, where we were able to purchase some awesome HMSC Student Organization swag. The rest of the day was available for work on our presentations for the evening meeting and wrapping up our other assignments. The presentations went great! Everyone had a great time feasting on cheesecake, cookies, and mussels, while enjoying marine invertebrate game shows and presentations. Some crowd favorites included Geoduck Jeopardy, Gumboot Chiton Bingo, and Blue Ringed Octopus Family Feud, with the last of these pictured below.

Thursday, April 11

On Thursday, we had multiple study sessions for both the lecture final and the lab practicum. Everyone then spent the rest of the day studying as hard as they could for the next day. Some even pulled late hours at the library, trying learn as much of the material as possible. Here we found Emily, Ashley, Hannah, and Megan all working incredibly hard and filling whiteboards with knowledge.

Friday, April 12

Today was the day of the final exam and lab practicum. We had all studied hard and it was amazing to see how far we had come in the last week. We learned the natural history of the Oregon coast, discovered the defining traits and anatomy of the invertebrate phyla, and memorized the scientific names of ~55 organisms we collected throughout the previous week. The lecture final exam began at 1pm and was followed by the practicum, so we had all morning to cram those last few scientific names into our brains. The exams were over by 4pm and after we cleaned up the lab for the next session we were ready to enjoy our weekend of freedom. The sun was even shining after two straight weeks of rain!

Saturday, April 14

Saturday was Marine Science Day at Hatfield, and the campus was full of people excited to learn about the center, marine science, and the programs offered at Hatfield. All of the labs and classrooms had been transformed into demonstrations for visitors. About six of us came out to volunteer in the wetlab, and it was a fun and rewarding experience to be able to teach the public some of the things we had learned in class and in the field. We had consolidated the organisms we collected into four tanks and released organisms that we had multiples of. The visitors were very interested in what we had to show them, and there were some very curious kids who were eager to see the organisms. We were able to show visitors how to identify different crab species, particularly the invasive green crab species we learned about earlier in the week with Sylvia Yamada. Other big hits were the nudibranchs, echinoderms, and skeleton shrimp. It was a fantastic way to wrap up the invertebrate unit and demonstrate how much we had learned, by teaching it to the public.

HMSC Marine Science Day!

One of our very own marine biology students, Ryan, was featured on the News of Lincoln County for Hatfield's Marine Science Day last weekend: http://www.newslincolncounty.com/?p=48382. Awesome!

The sun sets on algae!

After two days of algae last week, we jumped into a full, and final week of algae after a very relaxing weekend. Students were frantically working to complete their species identifications on time, and we were beginning to think of the impending final that lay before us at the end of the week. Lecture and lab carried on as usually, but this week was a little different because we went on another field trip, displayed and discussed projects on algal groups, and finally had our finals on Friday to finish the section that is... Algae.

On Friday of last week, after our lecture on algal systematic, we met at the lab at 2pm for our trip to seal rock. Once each seaweed team had equipped themselves with scrappers, clipboards, Zip-lock bags and buckets of various sorts, we divided into two groups, one for each van, and were off. Twenty minutes later we had passed the local fudge shops and were wondering just what went into an “Evil Brownie”, when we arrived at our destination. We got out of the vans and made our way to the viewpoint where our instructor, Annette, pointed out the various features of the landscape. As we made our way down the slope, we noticed the spectacular waves crashing against the rocks in the distance. This caused many of our group to stop and take pictures.

Students gather as Annette describes the various species at different elevations.

While there, we noted many varieties of seaweed from the three phyla. Red, or Rhodophyta, was most prominent as we neared the tide pools. There we saw Mazzaella splendens, M. parksii, multiple coralline species, Mastocarpus species, as well as a variety of kelps and green algae.

Various Algae in a large tide pool at Seal Rock

Then on Wednesday morning we embarked on our second field trip to Boiler Bay. It was a dark and stormy morning when we met Annette at the lab at 6am for our trip to Boiler Bay. At this point in the section we had collected many samples already, so our mission this time around was to collect species we did not have or to collect specimens to replace the ones dying in our lab. The drive up was interesting. As we went farther north, we encountered heavy rain mixed with hail and began questioning the sanity of our instructor when, all of a sudden, the weather cleared up. We came to the public view point where Annette and our TA, Orissa, got out to talk strategy. We soon learned two things: 1) one of the benches was no longer available due to increased sea levels, and 2) we had not quite arrived at low tide as expected, so we couldn’t go as far out as planned.

Once down there, we split up into our groups and searched for new specimens. Every once in a while, Annette would summon us with her whistle to look at an interesting specimen or feature we couldn’t see in lab. It was nice to see our knowledge of invertebrates was still with us, as many of our number either sought out or happened across many different species. After a few hours it soon started to rain (harder), so it was time then to leave. When we got back to the lab, it was discovered that a Pacific Rock Crab, Cancer antennarius, had hitch-hiked its way back with us in Caleb’s sweatshirt pocket.

Wednesday afternoon finally rolled around and we all needed to present our projects that night at 7:00 pm, the only problem was that none of us were done! The good news is that after a brief lecture in the morning Annette let us have the rest of the day to prepare. The groups consisted of 2-3 students, and each group was responsible for a lab-like presentation of a specific group of algae. The groups were dominated by red algae, which seems to be the most common in these here parts, and the groups were as follows; green algae, small brown algae, coralline red algae, filamentous red algae, finely branched red axes, coarsely branched red axes, coarsely branched red blades, thin red blades, and finally the thick red blades... phew, that's a mouth full of algae!

Melissa, Shay, and Em showing off their Filamentous Reds

Once each group was organized and ready for a lot of research, they set about creating notecards for the species of algae that belonged to their group. The notecards were used in lab, along with fresh specimens from our previous field trips, to help explain to the other students the general information on those species, what to look for in the field and lab when identifying them, and of course similar taxa to look out for. Along with the thoroughly descriptive notecards, each group was also in charge of keying out two tricky taxa in their group that are both similar in looks and morphology, and explaining the minute differences between the two. Before 7:00pm the groups set up their stations to look like a normal lab, complete with pictures, descriptions, specimens, dissecting scopes, and even cross sections of the species in their group (we got awesome pictures seen below), and when everything was finally ready to go at 7:00, the fun filled algae fest began! Annette and Orissa provided the snacks and the students provided the entertainment, and between the excellent descriptions and first hand experience, all the students went away with a lot more than they came in with. The night provided a great experience for us all to get intimately acquainted with the diversity of of algal species along the Oregon Coast, and we all felt a little more prepared for the lab final that was scheduled for Friday afternoon.

Cross section of Acrosiphonia coalita hooks at 40x magnification.

By far, week 5 was the most demanding and stressful week yet...Half the class came down with a cold, sleep was a rarity (and commonly accompanied by nightmares of algal ID sheets), and to top it off, the weather took a slight turn for the worst. However, Annette's energy, enthusiasm, and poetry helped us through the gloomy week. Of course, getting a few hours of extra sleep due to a cancelled field trip always helps too. Caleb found a small pacific rock crab that hitchhiked back to the lab in his coat pocket, we became masters of keying out algae, learned about the various life cycles, and even got an ecology lecture on how summer neap tides and limpet grazing effect algal zonation.

(Note: not a Rock Crab, this is a very red Kelp Crab)

It was a lecture on a field study that Annette herself did and it was very interesting as it showed the natural history of the area by showing us how different climates can have differing affects on the local diversity. Because the summer tides are often so calm, even the high tides don't splash essential water to the higher growing algae, and in short, they die, which sends the limpets to lower zones to find food. Yes, it was an action-packed week of algae to say the least. And congratulations to Orissa Moulton on completing her masters program, and good luck with whatever the future may hold!! We had a great time with you as a T.A., and we know everyone here at HMSC will miss you greatly.