Since my last entry we’ve had one small and one larger “fall out” of migrating birds here along the Space Coast. A fall out happens when birds encounter a weather event that forces them from flight to stop and seek shelter or food – or both – for a time before resuming their paths. Flying takes a tremendous amount of energy. Over a long period of time, many birds have developed methods to save that energy in flight. Neotropical migrants, like warblers, use approaching winds and weather fronts to time their overnight flights. For much of this spring there have been unusually strong southerly winds along the entire peninsula of Florida, allowing many migrants to fly very long distances with a tail-wind, often bypassing the state altogether. That has made for another fairly quiet migration, for the most part.
At the beginning of April, a cold front did sweep across the state, and some early migrants were forced down into area hotspots. At Lori Wilson Park, that generated some excitement as a rare Black-whiskered Vireo stopped for a couple of weeks. This is likely the same bird that also stopped there last year, so it remembered the park as a safe haven and place to refuel.
The season’s first Red-eyed Vireos were also present, as well as familiar faces that hadn’t found their favorable winds quite yet. Prairie and Yellow-rumped Warblers were still there, as well as the park’s large contingent of Gray Catbirds.
A complication this spring for any migrants that do need to stop and “top-up their tanks” is the lack of rainfall since the end of winter. Many places around the state are in drought and fire hazard warnings were up for much of the first part of April. The conditions only got worse as the month has worn on. The marsh habitat of Black Point Wildlife Drive on Merritt Island caught fire last week and about 5,000 acres burned. Fire is a natural and necessary force in shaping central Florida’s natural landscape, but only in area adapted for it. The area around Black Point is a wetlands habitat, dominated by mangroves. A hot burn there stands to do damage, even to the soil. It’s early days yet to know how much damage may have been done. The fire is suspected to be human induced, though the origin might never be truly known. If you smoke, please properly extinguish whatever you’re smoking and don’t light up when in areas prone to fire (which in recent days is just about anywhere outside).
After the small fall out at the start of April, conditions returned to strong, southerly winds again, even through the Spring meeting of the Florida Ornithological Society. The FOS meeting was in Ruskin this year, near Tampa. I’ll have a little to say about that coming up in another blog entry.
Finally, this weekend we had another front come through. Though not as strong as the one a couple of weeks ago, there were more birds in the sky as we’ve reached peak migration time for many species. The results were dramatic. Over at Fort De Soto park (just days after I left the area after the FOS meeting), dozens of tanagers and grosbeaks descended on the park, though the warbler numbers were low.
Closer to home, Turkey Creek Sanctuary finally saw its largest number of migrant warblers of the season. Over two days this week I went out before work to see what made pit stops there.
Tuesday morning had large numbers of Black-and white Warblers on the move. This species winters in Florida, Mexico, Central America, and parts of South America. It breed throughout much of the eastern US and Canada. There were also Black-throated Blue Warblers, American Redstarts, and Blackpoll Warblers throughout Turkey Creek Sanctuary. Small numbers of Cape May and Worm-eating Warblers were also there, and at least one Black-throated Green Warbler – a long anticipated life bird for me!
Many of the birds were moving west, out of the sanctuary and into the adjacent neighborhood. I think this might be because of the limited food supplies in the park itself. The native and ornamental trees in the neighborhood might be irrigated, thus producing more fruit and attracting more insects.
The following morning saw much the same mix, except the predominate bird was the Blackpoll Warbler. I saw at least 3 dozen, mostly males, throughout the entire southern part of the Sanctuary (the northern area – specifically the Sand Pine and Turkey Oak trails – remain closed as trees and debris are being cleared, due to last Fall’s hurricane Matthew.
Here are three eBird lists from Monday, Tuesday, and Wednesday. I included Monday’s list for a comparison to what happened after the fall out conditions.
Monday 4/24/2017: http://ebird.org/ebird/view/checklist/S36227122
Tuesday 4/25/2017: http://ebird.org/ebird/view/checklist/S36254038
Wednesday 4/26/2017: http://ebird.org/ebird/view/checklist/S36281378
Food supplies in the sanctuary are still low, but these birds are finding enough for at least a brief stopover.
I expect things will taper off again as the winds are already turning more southerly. There are still a few weeks to go for migration, so hopefully there will be more chances for birds to make stops along the Space Coast. Many of these species won’t be seen here again until October.
I know this entry is a little light in the photographs, but such is the way with small, fast moving targets. I was excited that my Black-throated Green Warbler was as accommodating as he was!