Feeds:
Posts
Comments

Posts Tagged ‘Herring Gulls’

Good morning everyone!

Life is busy here on Metinic. The terns have been creating more scrapes and laying more eggs by the day. It seems there is an egg everywhere you look! Walking around the colony reminds me of going on an Easter egg hunt, except you have to walk VERY carefully.

In addition to the terns, there are several other birds that nest on the island. Over the past couple weeks we have seen nests from Herring Gulls, Common Eiders, Spotted Sandpipers, Savannah Sparrows and Song Sparrows. One of my favorite parts about seeing each nest is the variation in the size of the eggs. There are eggs that are almost as large as your palm, like those of the Herring Gulls and the Common Eiders. Then there are eggs that are no bigger than the tip of your finger, such as the eggs of the Savannah Sparrows and the Song Sparrows. All of the eggs have variety of neutral colors and patterns that help to camouflage them from predators. It is incredible to see the attention to detail that birds have. Each nest is created in its own special way, and it is easy to see the time and energy that each bird puts into building their nest!

There are other birds that nest on the island, but they do not build the typical nest one would think of. These birds lay their eggs inside of small, hard to reach burrows. Some of the burrows are located in the rocks along the coastline. These burrows are home to Black Guillemots that will nest in a crevice no larger than your fist! Finding these burrows can especially difficult. I am amazed at how these birds can fit themselves into such a small space. I am even more amazed by the past technicians who have been able to locate these tiny nesting spots!

Last night we spent some time locating Leach’s Storm Petrel Burrows. Many of their burrows are made inside of the rock walls on the island. However, these small seabirds will also dig themselves burrows under down trees, large boulders, inside of small dirt mounds and even under our cabin. Believe it or not, we hear these small birds every night under our kitchen floor! Leach’s Storm Petrels are nocturnal, so locating their burrows requires going out on a late night adventure! We find each burrow by playing the “purr” calls of these birds. Then if we hear a response, we try to narrow down where the call is coming from so we can mark the entrance of the burrow. Once the burrows are located, we can go back in the daylight and use a burrow scope to look inside of the burrows and see what activity is going on. A burrow scope is a long, snake-like camera that we can use to see inside of the small burrows. 

So to recap – there are many different bird species that nest on Metinic! Living here during the breeding season is a magical experience. I feel especially grateful to have been chosen to work on this incredible island!

Today on Metinic it is raining sideways and the wind is blowing at over 20 mph. Needless to say, it is data entry day! Hopefully tomorrow we will be able to get back outside!

All the best,

Mary

 

 

IMG_4606

Song Sparrow Nest and Eggs (Photo by Mary Negri)

IMG_4607

Savannah Sparrow Nest and Eggs (Photo by Mary Negri)

IMG_4608

Spotted Sandpiper Nest and Eggs (Photo by Mary Negri)

IMG_4609

Herring Gull Nest and Eggs (Photo by: Mary Negri)

IMG_4610

Common Eider Nest and Eggs (Photo by Mary Negri)

 

Read Full Post »

It’s time to find out just what our gulls have been up to since we attached GPS tags.  In our first round of tagging, we sent out five tags on five separate Herring Gulls.  The tags we used are useful because they are lightweight, but they don’t transmit the data directly to us. Instead, we have to catch our gulls again.

We started by watching the nest. Both gull parents will help incubate the eggs, trading off throughout the day. The gull not on the nest generally heads out to forage for food. However, we only tagged one gull from each nest, so it’s important that we only set the trap up when the right gull of the pair is taking his or her turn at incubation. Thankfully, the GPS tags are easy to see from a distance.

Once we know the right gull is in the area, we set the gull trap up, just like before. We were hoping they wouldn’t get trap shy and refuse the sit on their eggs when the trap was present. Luckily, our first tagged gull was caught less than an hour after we set up the trap!

Success!

Success! A Herring Gull in a box trap

The tags were removed by cutting off the small tuft of feathers to which they were taped. Don’t worry – birds regularly replaced their feathers, so the cut ones will fall out and be replaced with new ones.

After downloading the data from the tag, what we found was pretty cool: our first gull’s foraging trips were more than 15 miles long. She stuck to the mainland coast, mostly between St. George and Rockland. Her trips sometimes took her more than four hours!

Gull 3 Map

The foraging routes of our first recaptured gull

In the end, we recovered three of the first five tags we sent out, and none of the gulls followed the same paths. One gull went straight up to Warren, ME several times over a few days. That’s a round-trip distance of almost 40 miles. We think he might have been looking for spawning alewives.

Gull 4 Map

Our second gull made a beeline for Warren every time!

The third gull stayed local and barely left the waters around Metinic Island – it looks like she preferred feasting on the spawning polychaete sand worms just offshore.

Gull 3 must have found plenty to eat in her own backyard

Gull 3 must have found plenty to eat in her own backyard

We also lost two tags – the gulls managed to pull them off, so it looks like we need to come up with a new way to attach the tags. Our next step is to design a harness for the tags that the gulls can’t rip or tear. Hopefully we’ll have more news about our wandering gulls before the season is over.

Metinic also has plenty of terns and guillemots – expect to start hearing about them soon!

-Amy

Read Full Post »