Conserve Wildlife Blog

Posts Tagged ‘Grassland Birds’

2023 JB McGuire Grassland Bird Survey

Friday, October 13th, 2023

by Meaghan Lyon, Wildlife Biologist

Each year since 2017, CWF has been teaming up with partners from the USFWS New Jersey Field Office to survey the JB McGuire Airfield for grassland birds during the breeding season.  Part of a long-term monitoring project, the airfield has been undergoing habitat restoration to maintain native warm season grassland habitat. The habitat restoration efforts are nearly 70% complete with roughly 700 acres seeded since 2017 and another 100 acres to be completed the following year.

Six of the ground-nesting bird species documented at the airfield are State-listed as either endangered, threatened, or of special concern.  The eastern meadowlark (Sternella magna), a member of the blackbird family, is a State Species of Concern.  It prefers a minimum of ten to twenty acres of unfragmented dense grasses of medium height for nesting.  The State-threatened grasshopper sparrow (Ammodramus savannarum) favors patches over 100 acres containing short- to medium-height bunch grasses interspersed with patches of bare ground, a shallow litter layer and scattered forbs. The savannah sparrow (Passerculus sandwichensis), also State-threatened, requires a mix of short and tall grasses, a thick litter layer, dense ground vegetation, and scattered forbs.  Another member of the blackbird family is the State-threatened bobolink (Dolichonyx oryzivorus).  Bobolinks prefer to place their nests in areas of greatest vegetative height and density and could potentially nest in patches as small as five to ten acres.  The State-threatened horned lark (Erimophila alpestrias) nests in areas of barren ground with short and sparse cover and are quick to abandon sites as vegetation grows thicker. 

Grasshopper sparrow nest located at McGuire Airfield, May 2023. The well-camouflaged nest was discovered after the adult bird flushed from the grass. The eggs were as tiny as a thumbnail.
(more…)

2022 Upland Sandpiper Survey Results

Tuesday, January 17th, 2023

by Meaghan Lyon, Wildlife Biologist

The results are in! It wasn’t a great year for upland sandpipers at the McGuire Airfield. Numbers of breeding pairs at this location have decreased to an estimated two pairs. Numbers can be variable from year to year so there is still hope for better news in 2023.

Upland sandpipers typically require a minimum of 100 acres for breeding habitat and so large expanses of open, grassy land is a high priority. Over the past five years, long term efforts have been ongoing to complete a large-scale grassland restoration at the McGuire Airfield. So far, roughly 500 acres have been converted to native warm season grasses with another 100 acres to be completed by next spring. Our goal is to help create and maintain grassland bird nesting habitat for Upland sandpipers and other species.

(more…)

Grassland Bird Survey Yields Promising Results

Friday, May 20th, 2022

by Meaghan Lyon

Earlier this week CWF and USFWS biologists joined forces to start off the season with a grassland bird survey in Burlington County, New Jersey. The vast grassland habitat, doubling as an airfield, is home to the state endangered upland sandpiper, state threatened grasshopper sparrow, savannah sparrow, and bobolink, as well as the eastern meadowlark, a species of concern. These bird species, among many others, can all be found nesting at this site in the clumps of grass during the months of May, June, and July. Many of the management practices at the airfield, like consistent mowing, help maintain this grassland habitat and keep it an early successional state for grassland birds to nest in year after year.

For the survey, biologist met on site just before sunrise with binoculars hanging from their necks and clipboards with data sheets in hand. Male birds were already perching on tall blades of grass and singing to attract mates and defend territory as we dispersed to our survey points. At each point it was our job to distinguish what bird song and calls we were hearing and record any focal species activity onto our data sheets.

Between the three surveyors and 25 survey points, all of the target species were identified as well as hundreds of red-winged black birds, two great egrets, and a few mallard ducks. Of particular note, one upland sandpiper pair was sighted in its usual nesting area.

Three more surveys will follow between now and the end of the grassland bird nesting season. Follow along for updates throughout the season!

Grassland Birds of New Jersey

Thursday, December 28th, 2017
Part II: Restoring Critical Breeding Habitat

by Meghan Kolk, Wildlife Biologist

In Part I of this series, I discussed the drastic loss of grasslands in New Jersey and the importance of preserving and restoring this disappearing habitat for grassland-dependent bird species.  Due to this habitat loss, in much of the northeastern United States (including New Jersey) airports have become significant breeding grounds for many threatened and endangered grassland birds.  In fact, airports are often the only suitable habitat available for New Jersey’s rarest grassland bird, the upland sandpiper.  If these large expanses of open fields are managed properly, they can support nesting birds while still remaining safe for aircraft operation.  This is the goal of CWF’s new restoration project at one of the most critical breeding sites in New Jersey.

Restoration site at Lakehurst breeding grounds, December 2017. Photo by Meghan Kolk.

The Joint Base McGuire-Dix-Lakehurst (JBMDL) in central New Jersey hosts the largest known breeding colony of the endangered upland sandpiper (Bartramia longicauda), and the second-largest known breeding colony of the threatened grasshopper sparrow (Ammodramus savannarum) in the State.  The bobolink (Dolichonyx oryzivorus), savannah sparrow (Passerculus sandwichensis), horned lark (Eremophila alpestris) (all threatened) and eastern meadowlark (Sturnella magna) (special concern) all make a home here as well during the nesting season.  CWF has  partnered with the U.S. Fish and Wildlife Service to restore hundreds of acres of this vital land to increase suitability and to alter management practices to benefit both wildlife and airfield operations. (more…)

Grassland birds of New Jersey

Wednesday, August 30th, 2017
Part I: The Importance of Grassland Habitat

By Meghan Kolk, Wildlife Biologist

In this blog series, my goal is to examine the importance of grassland habitat in our state, introduce CWF’s new habitat restoration project, and highlight many of the species of grassland birds our project aims to benefit. So, first I’ll start off with a little background information about grasslands and why we need to preserve, restore and create more of this critical habitat. (more…)