Karl David Hyrenbach

Karl David Hyrenbach

Waimanalo, O'ahu

Research Associate, Oikonos Ecosystem Knowledge

Associate Professor of Oceanography, HPU


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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Published on Dec 06, 2016

No shearwater fallout after 3 days without tradewinds

We have documented 45 downed wedge-tailed shearwaters, during 12 road surveys conducted every three days since November 3.  Our last survey did not document any additional fallout, since the trades...

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Published on Dec 03, 2016

Tradewinds slacken... will fallout continue ?

After three weeks of persistent NE trades, they virtually stopped yesterday early afternoon. The wind remains weak and erratic, as a low pressure system moves across the islands. Currently, we have...

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Published on Nov 28, 2016

One Full Lunar Cycle

We have documented 36 downed wedge-tailed shearwaters, during 9 road surveys conducted every three days since November 3.  Today is day 28 of the study, and our surveys have spanned an entire moon ...

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Published on Nov 21, 2016

Half-way Point of the Road Surveys

Today we completed the 7th road survey of the season, and found 9 downed wedge-tailed shearwaters (WTSH) along the kanaliana'ole Highway along Waimanalo.  Overall, we have documented 21 dead shearw...

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Published on Nov 15, 2016

Tradewinds pick up and fallout increases

Despite the super moon, today's survey found 5 more downed shearwaters along the Kalaniana'ole Highway.  What has changed since the last survey, on November 12?Starting in the morning of November  ...

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Published on Nov 09, 2016

Three for three

All three Kalaniana'ole Highway surveys we have conducted to date (on 11/3, 11/6 and 11/9) have documented shearwater fallout.  Overall, we have found 3 downed shearwaters (a chick in each survey),...

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Show more updates
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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