K. David Hyrenbach

K. David Hyrenbach

Waimanalo, O'ahu

Research Associate, Oikonos Ecosystem Knowledge

Professor of Oceanography, HPU


Published on Aug 13, 2023

Shearwater Chicks are Hatching !

Over two thirds of the 64 nests we have been monitoring since late July have hatched chicks already and we are getting ready to start tagging the parent wedge-tailed shearwaters by the end of this ...

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Published on Jul 26, 2023

Marking Shearwater Nests for Tagging

WThis week, we are marking 120 shearwater nests at the Freeman Seabird Preserve: One "experimental" adult from 30 nests will be equipped with a geolocator (GLS) tag capable of recording the birds...

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Published on Jul 16, 2023

Record Count at Freeman Seabird Preserve

On July 14th we completed the annual census of active nests during the peak incubation period, and the count yielded a new record for the Freeman Seabird Preserve: 427 ! This week, we will start m...

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Published on Jan 02, 2023

Expanded Road Surveys into Kailua Town

The last thee years, we have continued our surveys of seabird fallout along the Kalaniana'ole Highway, using a modified route from the Makapu'u lighthouse to Lanikai. Our surveys during the shearw...

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Published on Apr 01, 2022

Looking back at a decade (2002-2010) of wedge-tailed shearwater fallout along SE O'ahu revealed that 2011 was a year with an unusually high number of grounded birds.

Looking back at a decade (2002-2010) of wedge-tailed shearwater fallout along SE O'ahu revealed that 2011 was a year with an unusually high number of grounded birds.Hyrenbach, K.D., Urmston, J. &am...

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Published on Mar 27, 2022

Our results have been published on PLoS ONE !!!

Our results have been published on PLoS ONE !!! HPU graduate Jennifer Urmston has published the first chapter of her MS thesis.  Working with U.S.F.W.S. special agent Keith Swindle and her HPU advi...

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Published on May 26, 2020

Completed 8-year project

We just completed an 8-year study (2012 - 2019) to compare seabird fallout before and after the switch from yellow high-pressure sodium (HPS) bulbs to white light-emitting diode (LED) highway light...

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Published on Dec 21, 2016

Unusually high Fallout in 2016. But Why ?

We completed the last road survey this morning, with a total of 46 downed wedge-tailed shearwaters documented during 17 surveys since November 1.  Overall, 2016 was a year of fairly high fallout, i...

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Published on Dec 12, 2016

Only a downed shearwater in the last 9 days

We have documented 46 downed wedge-tailed shearwaters, during 14 road surveys conducted every three days since November 3.  Our last three surveys only documented one bird, since the trade winds st...

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Help Alyssa solve this mystery: her goal is to raise $100 a day for 45 days !
Jul 13, 2023
Does El Niño affect the winter migration of Hawaiian Wedge-tailed Shearwaters?
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Aloha Cindy, In Hawai'i, October is the beginning of the fledging season for Newell's Shearwaters and Hawaiian Petrels, followed by the Wedge-tailed Shearwater fledging season in early November and running through early January. People living near seabird colonies need to be aware of their light pollution, especially during no moon nights. During the fledging season, you can avoid night-time sport games or events in lighted parks or recreational fields... especially if they are close to the shore. You can also be on the look-out for downed shearwaters on the side of coastal roads at night or in the early morning. Here are some hints for how to rescue a downed seabird: http://www.hawaiiwildlifecenter.org/rescue-injured-bird.html
Oct 05, 2016
Blinded by the light: reducing shearwater deaths along a coastal highway in O'ahu, Hawai'i
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