Date: 6/11/18 10:07 am From: Wayne Hoffman <whoffman...> Subject: [obol] Re: Oystercatchers
I have seen this in the past; e.g. at Destruction Island WA in 1974, and a few times over the years in Oregon.
IMO these "adults" are birds that have not been able to secure territories. I suspect many are younger (SY, TY?) and others may be socially "losers" (incels?). Based on these observations, and observations of territorial oystercatchers almost everywhere that looks like acceptable habitat, I think that the breeding habitat is full.
This implies that nesting success and juvenile survival, as poor as they seem when you monitor individual nests, is more than adequate to replace adult mortality. In other words, this is an indicator of a pretty healthy population.
On 6/11/2018 9:42:40 AM, Roy Lowe <roy.loweiii...> wrote:
Saturday evening I paused at Yachats to take in the dramatic sunset with thunder cells moving through. I first heard a black oystercatcher call then observed 10 adults roosting together on the rocks below me. I don’t remember ever seeing a group of oystercatchers roosting together during peak breeding season.
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