by Todd Pover, Senior Wildlife Biologist
Most people are surprised to hear that American oystercatchers are present in New Jersey in the winter. They usually associate the charismatic shorebird as a breeding species here. Our state’s wintering oystercatchers, a combination of breeders from further north and our own, are at the northern extent of the Atlantic coast wintering range.
Continue reading “CWF Assists the State with Wintering American Oystercatcher Survey”By: Meghan Kolk, CWF Wildlife Biologist
The Delaware Bay is well known for the spectacular phenomenon of spawning horseshoe crabs and migrating red knots every May, but in recent years the American oystercatchers (Haematopus palliatus) have also discovered the allure of the Bayshore and made it their home. American oystercatchers, a State Species of Special Concern, have been monitored and managed by CWF and the NJDFW’s Endangered and Non-game Species Program along the Atlantic coast beaches for nearly two decades, resulting in a steady population increase. However, the population that breeds along the Bayshore, first documented in 2016, has not received the same attention and had never been fully surveyed until this year.
CWF’s interest in this newly discovered population led to a small pilot study of a few known breeding pairs in 2018. Then this past May, we launched a bay-wide survey of the sandy beaches of the New Jersey side of the Bay from Cape May Point up to Seabreeze, the northernmost beach in Cumberland County. The purpose of the bay-wide survey is to determine a baseline of the number and distribution of breeding pairs along the Bayshore. The data gathered from this survey will add to the Statewide population estimate and help determine the amount of time and funding needed to fully monitor and manage the Bay’s population. More monitoring will be necessary to assess risk factors and reproductive success. Reproductive success can then be maximized by managing for risk factors such human disturbance, predation and tidal flooding.
This survey was made possible due to the efforts of dedicated volunteers and could not have been completed without their help. Unlike the Atlantic coast, the Bayshore beaches are often difficult to access, and many can only be reached by boat, making this survey more challenging. In fact, two sites that we planned to survey proved to be too difficult to reach and were skipped for this year. Each of the 33 remaining sites were surveyed just once within a specific timeframe, giving only a snapshot of the breeding season. We hope to be able to collect much more information in the future when more funding for this project is available. Based on the survey that was conducted, 13 pairs were documented at 8 different sites and 8 nests were documented at 5 different sites.
In addition to the formal survey, I was able to collect some observations as I spent every day in May on the Bay working with red knots. I took notice of the prey items that the oystercatchers were choosing. I often observed them feasting on oysters, which were plucked off exposed rubble at low tide. They also spent time at the man-made oyster reefs that were constructed at several beaches to act as breakwaters to slow the erosion of beaches. They also favored ribbed mussel beds, which become exposed as the tide recedes. The most interesting foraging behavior I witnessed was an oystercatcher plucking a fresh slipper shell off a horseshoe crab as it came to shore to spawn. It seems the Bay offers a variety of good food sources for a bird that mainly preys on bivalve mollusks.
I also noticed that flocks of up to 11 oystercatchers were traveling together up and down the Bayshore. This is a peculiar behavior since oystercatchers are highly territorial during the breeding season and are typically only seen in flocks once the breeding season is over. Could it be that the Bayshore is a popular spot for non-breeding young adults to hang out?
So much more research is needed to answer the many questions we have about the mysterious Bayshore oystercatchers.
by Ethan Gilardi, Wildlife Biologist
CWF biologists Todd Pover, Meghan Kolk, Ben Wurst, and Erin Foley have delivered a series of hands-on lessons – on the beach and in the classroom – in Asbury Park this summer. So far, students have learned about owls, beach nesting birds, and ospreys.
Conserve Wildlife Foundation is proud to partner with Asbury Park School District and New Jersey Natural Gas to teach students about Asbury Park’s rare wildlife, and how to protect and preserve the environment the kids – and the wildlife – call home.
Check out photos of this summer’s fun!
By Alison Levine
Update May 30, 2019: Another example of the dangers of fishing (or this time crabbing) line unfolded in dramatic fashion in Tuckahoe Wildlife Management Area. CWF biologist Ben Wurst was called upon to put his climbing skills to the test to help an osprey dangling high above the ground. Thankfully Ben was able to get to the bird in time, and our friends at Tri-State Bird Rescue and Research nursed the osprey back to health and were able to re-release him near where he was found. Read more about the daring rescue on our Facebook page.
As thousands of people plan their trips to the Jersey shore for Memorial Day weekend, it is a good time think about how to help out shore and sea birds. Enjoy the holiday weekend!
The 141 miles of seashore in New Jersey are home – or at least part-time host – to many of the birds Conserve Wildlife Foundation protects and nurtures. Osprey, oystercatchers, black skimmers, piping plovers, red knots, and many others rely on a healthy coast to thrive.
By Emily Heiser, Wildlife Biologist
Many piping plover and American oystercatcher pairs have been busy laying their eggs over the last few weeks. As beach nesting bird biologists, we invest a lot of time into every pair at our sites. We revel in their successes and feel defeated at their losses. Unfortunately, many nests did not fare well in the April 25th Nor’easter that was coupled with new moon tides. Luckily, it is early enough in the season that all of them have begun, or will soon begin, attempting new nests.
The breeding habitat of the American oystercatcher in New Jersey consists of coastal beaches, inlet systems, and salt marshes. Population estimates in New Jersey suggest 350-400 breeding pairs can be found here from March through August. Much of the monitoring and research done with American oystercatchers in New Jersey takes place on the coastal beaches where other beach nesting birds, such as piping plovers, least terns and black skimmers, are found. In 2016, more than 120 breeding pairs of beach nesting American oystercatchers successfully fledged 83 chicks. This was an especially productive year for those pairs and productivity levels were well above the target goal of .5 chicks per pair.
Oystercatchers arrive back on their breeding grounds here in New Jersey in early March to set up breeding territories and begin nesting. Once paired up, adults typically lay one to three eggs. Both the male and female will take turns incubating the nest for 28 days. Once chicks hatch, they are semi-precocial, which means they are born in an advanced state, but are still reliant on adults for food and protection. Oystercatcher chicks are fledged (or able to fly) 35 days after hatching. After fledging, most Oystercatchers migrate to the southeast, but a wintering population does remain here in New Jersey.
American oystercatchers are listed as a Species of Special Concern in New Jersey. A “Species of Special Concern” is a status determined by the New Jersey Division of Fish & Wildlife and applies to species that have an inherent threat to their population or have evidence of recent population declines. Since American oystercatchers share the same habitat as other endangered or threatened beach nesting birds (piping plovers, least terns, and black skimmers), they also share the same threats to their nests and young. Human disturbance, a host of predators, and flooding events, such as the one that took place last week, are just some of the many threats beach nesting birds face daily.
The Conserve Wildlife Foundation of New Jersey has long partnered with the New Jersey Division of Fish and Wildlife’s Endangered and Nongame Species program in the monitoring and management of New Jersey’s endangered beach nesting birds. Fencing and signage are placed in nesting areas to alert beachgoers to the presence of nesting American oystercatchers and other beach nesting birds. Throughout the summer, CWFNJ and partners will be out on the beaches monitoring and collecting data that will be used to track population trends and identify threats to oystercatchers and their young.
Emily Heiser is a wildlife biologist for Conserve Wildlife Foundation of New Jersey.
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by Todd Pover, Beach Nesting Bird Project Manager
There are many ways to gauge success for our beachnesting bird project. We look at how well our management tools work, the effectiveness of our partnerships, and how well our educational efforts work, to name a few qualitative measures we use. At some point, however, it comes down to cold hard numbers, how well did the birds do in a particular season and over the long-term. We are at that point in the season, and for the most part, I am happy to report it has been an excellent breeding year. I will caution that these are still preliminary figures, some quality checking of the data needs to be done before they are final, but the trends are clear.
First up are piping plovers. We will come in at ~115 pairs statewide, up modestly from the 108 pairs in 2015, and the second consecutive year of an increase after hitting our historic low of just 92 pairs in 2014. So, we have climbed back closer to our long-term average, but there is still room to improve. The really good news is our productivity this year – close to a statewide record at 1.37 chicks fledged per pairs – puts us in the position to continue our population increase. If trends hold, because piping plovers demonstrate high site (or region) fidelity, when we produce a lot of fledglings, our breeding population rises in the next year or two. With three straight years of well above average fledgling rates for New Jersey now in the books, our prospects look good in the short term for our breeding population levels.
Least terns and black skimmers, which nest in colonies, sometimes numbering hundreds (or even thousands), are more challenging to count and assess, but we had at least modest success this year for both species. As is typical, our least tern colonies were variable, with some completely failing and others being highly productive. The Monmouth County region, one of our strongholds for least terns in New Jersey, didn’t have one colony that was a standout but most of them had at least some success. In South Jersey, our two largest colonies at Holgate (EB Forsythe NWR) and Seaview Harbor were very successful and helped make up for losses and failures at other colonies. The majority of our state’s black skimmers are concentrated in one large colony at Seaview Harbor, and although skimmers are our latest nesters (so the season isn’t quite over for them), they appear to have been very successful there, which means a good season overall for the state.
We also track American oystercatchers, although only for the portion that nest on the barrier beaches and spits. Because the biggest percentage of oystercatchers in the state nest on back bay and marsh islands, we cannot determine true statewide population or productivity levels, but the population on the beach habitat appears to be rising in recent years. Typically breeding success is lower for oystercatchers on the beach habitat due to high levels of human disturbance and predators, but productivity has been relative high the past two years. Of particular note this year was Stone Harbor Point, where a record number of 27 pairs nested and produced over 30 fledglings.
The reality is our beachnester staff works just as hard in years when the birds do poorly, as when they do well like this year, but it is SO much more rewarding when we have a good season. So as we wrap up the season, we are all feeling in a bit of a celebratory mode now!
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by Todd Pover, Beach Nesting Bird Project Manager
Amazing transformation of a piping plover from tiny chick to fledgling in just 25 days. Both photos by Northside Jim.
The highlight of this past week was our first piping plover fledglings of the season. This means the first group of chicks has reached the stage where they can fly, which is our metric for success. Hatching the chicks is always great, but our goal is population recovery and the primary way we can increase our low population in New Jersey is to produce more fledglings to come back in future years to breed here.
The doubly exciting news is ALL four of the chicks that hatched at Barnegat Light reached the flying stage. This is notable because typically, on average, we only fledge about one chick per pair in New Jersey. This is not enough to grow or sustain our long-term population. Population modeling tells us we need to fledge about 1.5 chicks per pair range-wide to grow the population and about 1.25 chicks per pair to sustain it.
Of course, not all our piping plover pairs will fledge four chicks, in fact, some may not fledge any. So the Barnegat Light news was a good way to kick off our fledgling season and hopefully it is a sign of above average productivity this year.
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Todd Pover is the Beach Nesting Bird Project Manager for Conserve Wildlife Foundation of New Jersey.
by Todd Pover, Beach Nesting Bird Project Manager
The beach nesting bird field staff is firing on all cylinders now, frantically trying to keep up with nesting activity. In some regions of the New Jersey coast, piping plovers and American oystercatchers are still laying eggs, while at other sites there are chicks on the beach, even one site (Barnegat Light) where the chicks are already approaching their “fledgling” stage when they will be able to fly.
Most of the least tern and black skimmer colonies are now established, with least terns starting to hatch chicks and black skimmers just laying eggs. Counting the colonies is one of the most challenging parts of the job, imagine trying to count 1,000-1,500 birds at a time in some instances!
All the normal beachnester tasks are keeping us busy, but the main focus this past week was the annual piping plover “window” census, where field biologists all along the Atlantic coast count the number of birds present between June 1-9, so we can get a range-wide breeding population estimate. As for New Jersey, it looks like our population will go up, at least slightly, for the second year in a row. Although this is still a very preliminary estimate, it looks like we have weathered the statewide low in breeding pairs we recorded in 2014, thanks to good productivity the past two years.
Of special note is a spike in Monmouth County (outside Sandy Hook), where we have gone from 2 pairs the past several years to 12 pairs this year. Although a smaller bump, we also went from 1 pair to 4 pairs within Barnegat Inlet, an area we have long hoped for more pairs. It takes a tremendous effort to realize even small gains in our piping plover recovery effort, so we are especially excited about this news!
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Todd Pover is the Beach Nesting Bird Project Manager for Conserve Wildlife Foundation of New Jersey.
by Todd Pover, Beach Nesting Bird Project Manager
It has been a busy week on the beach nesting bird project! We had our first least tern nests of the season, as the brief spell of warmer weather (finally) made for a burst of breeding activity. The first American oystercatcher nests hatched, so we have chicks on the beach now, as well.
And there was a big spike in new piping plover nests all along the coast, so we were busy erecting “predator exclosures” to protect the eggs from predators, such as crows, cats, gulls, and foxes. While they are not effective or viable to use on every nest, these wire cage structures are one of our best management techniques to increase hatch success by deterring predators.
This week we will be even busier, as we make a mad scramble to protect the nests and colonies before the crowds of beachgoers arrive for the Memorial Day weekend!
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Todd Pover is the Beach Nesting Bird Project Manager for Conserve Wildlife Foundation of New Jersey.
Posted by: Lindsay McNamara, Communications Manager
Did you know barrier island beach makes up approximately 2% of the Edwin B. Forsythe National Wildlife Refuge? This area is the most productive for beach nesting birds. The federally threatened piping plover and other species such as least tern, black skimmer, and a species of special concern, the American oystercatcher, nest on Holgate Beach. The refuge closes the Holgate unit from April 1st to September 1st every year to provide undisturbed nesting habitat for these important species.
Not only is it important to protect nesting habitat for the birds, but it is also important to provide education opportunities to the public. Each summer, the refuge relies on volunteers during the summer months to talk to the public about the beach closure and bird management, and answer any general questions about Forsythe Refuge.
This year, Conserve Wildlife Foundation of New Jersey partnered with the refuge to assist in the collection of nesting data. “In the past, refuge staff has done all the beach nesting bird monitoring,” said Refuge Manager Virginia Rettig. “This year we are very excited to be working with our partners to monitor the population status of these birds. The work they are doing, combined with the data they collect, will improve our understanding of beach nesting birds on Forsythe Refuge.”
“Holgate provides highly suitable undisturbed natural habitat for at-risk beach nesting birds, especially piping plover – a rarity along the otherwise highly developed and recreated New Jersey Coast,” said Todd Pover, CWF Beach Nesting Bird Project Manager. “Maximizing productivity at this site is a high priority for regional and range-wide recovery efforts.”
Edwin B. Forsythe National Wildlife Refuge protects more than 47,000 acres of sensitive wetlands, marshes, and coastal habitats along the New Jersey shore. It is one of the most important habitats for migrating waterfowl and shorebirds east of the Mississippi River.
Learn more:
–Conserve Wildlife Foundation’s Beach Nesting Bird Project
–Edwin B. Forsythe National Wildlife Refuge
Lindsay McNamara is the Communications Manager for Conserve Wildlife Foundation of New Jersey.