Osprey season has begun!

The first Osprey has been sighted! So it's time to begin checking some nests! Keep looking up, checking those lights and cell towers, and please, please, please, report new nests to us by emailing osprey.mn@gmail.com!

2014 Summary...

Here is the 2014 summary...

The 2014 Osprey season in the eight county metro area surrounding Minneapolis and St Paul began late after a very long, cold winter. We did receive reports of Ospreys as early as March 1, but we were not able to confirm any Osprey sightings until April 6. Some eggs were laid unusually late and there were chicks which did not fledge until late August. The adult male stayed and cared for these late chicks for a full month, not departing until early October. The overall number of known occupied nests dropped this year. (There may be more nests we do not know about.) There were 12 nests which were occupied last year but were empty this year. Four pairs from those nests moved to a new nests and six additional single birds moved to a new nest with a new partner. There were 101 nests which were occupied* by a pair of adult ospreys. One additional nest had only a single osprey observed. Eggs were laid in 89 nests (94 in 2013) and 71 of these nests had at least one chick that was confirmed to have fledged successfully or survived to fledging age (70 in 2013). There were 30 nests which failed (33 in 2013). There are two distinct subcategories under failures; nests where a pair was present but no eggs were laid (12) and nests where eggs were laid but they failed to successfully fledge a single chick (18). (Not laying eggs is considered to be a kind of nest failure.) There were three additional nests, discovered late in the season, where it was not known if eggs were laid or not, but no chicks were ever observed. There were 126 chicks that were known to have fledged successfully or survived to fledging age. There was a high mortality rate in 2014 with 33 additional chicks which were known to have died or disappeared before fledging. Three adults also died or disappeared midseason; two from one nest and another at a nest very near. There were 94 adult Ospreys identified by their bands. Two of these were from Iowa, one was from southern Ontario. There were only 9 new nesting territories that we know of. Only three of these new nests successfully fledged chicks. There were 9 banded Ospreys which were believed to have bred successfully for the first time and their average age was 4.10 years old. (Average age of first successful breeding for males this year was 4.29 years and for females it was 3.67 years).
The overall productivity of occupied nests which were successful this year was 70%, (67% in 2013, 77% in 2012, 70% in 2011, 73% in 2010). The mean number of young fledged per successful nest was 1.77 (2.08 in 2013). The mean number of young fledged per active nest was 1.41 (1.55 in 2013) and the mean number of young fledged per occupied nest was 1.25 (1.39 in 2013). These numbers reflect a drop in productivity per nest, largely due to the high mortality rate. The causes for the mortalities are not clear. A few losses can be attributed to storms, but many cannot. Swarming of black flies were observed at some bandings and one chick that was being viewed on a web cam, seemed to have jumped to its death to escape the flies.

Vanessa Greene
(Any use of this data should have its source appropriately acknowledged.)

soon...

I know many of you are anxious to see our Ospreys back on their nests. Migration studies have shown that they often make their turn trip in a shorter time than the fall southerly migration. They are fueled by hormones. The older experienced Ospreys, who have bred successfully in the past, seem to know that the sooner they return to defend their territory, fix up the nest and get the eggs laid, the better chance their offspring will have for survival. The more time the young ones have to build their skills and prepare for the first migration, the better. This year in Minnesota, they will not be hampered as much as last year by frozen lakes and deep snow. Any day now...

2014 ACKNOWLEDGEMENTS...

There are so many people who have been instrumental in helping Twin Cities Metro Osprey Watch continue this Osprey research. A very special thanks to Alice Stoddard and Barb Ankrum for their steadfast help, support and encouragement. You have no idea how much it has meant to me personally and to the research. It is not always easy to keep going and you both have supplied needed inspiration with your passion and dedication. Many thanks also to Sonja Axness, Dick Allen, Don Steinke, Perry Westphal, Bruce and Virginia Bernin, Faith Christine, Margaret Wurtele, Ellie Crosby,  Grace and Roger Pass, Phyllis Bofferding, Debbie Engelmann, Jim Radford, Larry Waldhauser, Tedd Clauson, Tom Morris, Krista Wilkowske, Marty Osborn, Jason Bolish,  Karen Connolly, Derek Burns, Melinda Grahl, Margaret Hutchinson, Tom Schmelzer, Sean and Karen Akins, Meriah Jacobs-Frost, Lee Bakewell, Steven Steinborn, Luke VandenBergh, Linda Radimecky, Carol  Fischenich, and Mary Meyer, for sharing their observations, their committment to this effort, their photos, and their love for these birds with me. Thanks to Tom Burrrows at Aggregate Industries, Mary Lee and Janice Hawkins at the National Guard, Roger Stanton at Bolander Construction, for all their cooperation in allowing me to monitor nests.

Thanks to Marlyn Anderson for technical assistance with computer issues and data organization. 

I am sure I have forgotten someone and I will post an addendum when I remember!

A very special and heartfelt thanks to Virginia and Bruce Bernin, Don Stienke, Perry Westphal, and Jo Beuhler Maltman, for their financial donations which helped me continue this research.

And finally a thanks to all the osprey fans around the world who have written to me, hit the "like" button, shared their stories, enthusiasm and love for these birds and generally offered support in ways that cannot be described. I appreciate all the kindness and camaraderie. 

Vanessa Greene

Mid March...they are on their way...

Here it is mid March. I know many of you are anxiously awaiting the return of our winged friends. I want to once again, express my gratitude to all who helped me watch over all the nests last year. I am hoping you will all return this year to document all the milestones, behaviors, nesting success or failure and those precious chicks! Please drop me an email if you intend to watch your nests again. If there are new people who would like to jump in and adopt a nest or two to watch over this year, also drop me an email so we can decide where to plug you in. We always need help monitoring this growing population of Ospreys! I will have some new posts soon with final numbers from last year and acknowledgements of all the wonderful people who contributed so much. I am still putting on the finishing touches and rechecking data one more time. There is so much data collected and so much to pull together! 

So keep your eyes to the sky and stay tuned! 

Feb 14, 2015

Well folks, I got a lovely card today from an unidentified osprey, somewhere in South America...who said it is nice and warm, but his heart is in Minnesota, he misses me and will see us all soon! I am not kidding! Some wonderful person must have helped him send it! 

Happy Valentines Day to you all!

Return migration

I just received a question about the return migration of our Ospreys. We often get unconfirmed reports starting in early to mid March, but I think personally I have not seen an osprey before the end of the third week or the fourth week of March. Last year my first sighting was on April 6. But as you know, we had a loooooong cold winter. It depends on whether or not we still have frozen lakes. Ospreys usually make the return trip quicker than their fall migration. It is the urge to breed that brings them back and they know that returning early, defending their territory from other Ospreys and laying the eggs early will be a more successful breeding strategy. They can make it back from South and Central America in about two weeks, but if they run into snow and frozen lakes, they seem to slow down and hang out where fish are available. Sometimes, if lakes are frozen here, we will see the resident birds show up at their nest sites, but since they have to travel to open water for food, they may only be seen sporadically in the early days of the breeding season. 
I am working hard on the annual report now...gathering, organizing and analyzing the data collected last year. A lot of work! Fun tho!