Martin Renner

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Individual marking of birds is required in many studies. Lance Richdale pioneered marking of penguins in the 1930s (Richdale 195 1, 1957). His most reliable method was punching holes in the feet, but he also used homemade aluminium leg bands which had to be replaced every three years because of wear. Subsequently, researchers reported that leg bands used on(More)
Due to their marine habitats and distinctive foraging modes, seabirds face unique challenges with respect to flying that are negotiated differently by various species. One such challenge is taking off from the water with wet plumage. This study evaluated plumage wettability and takeoff performance in three seabird species: two wing-propelled divers with(More)
Timing of spring sea-ice retreat shapes the southeast Bering Sea food web. We compared summer seabird densities and average bathymetry depth distributions between years with early (typically warm) and late (typically cold) ice retreat. Averaged over all seabird species, densities in early-ice-retreat-years were 10.1% (95% CI: 1.1-47.9%) of that in(More)
EXECUTIVE SUMMARY Chagulak Island is one of the largest seabird colonies in the Aleutian Islands Unit of the Alaska Maritime National Wildlife Refuge. Nevertheless, seabirds there have seldom been counted because Chagulak lies at the edge of Amukta Pass, an area known for strong currents and rough seas. The island is round with no protected bays, so(More)
Power analyses are essential when developing a long-term monitoring program for a target species whose observation is logistically challenging and expensive. These analyses can be complicated when the observations have a complex variance structure reflecting many factors. Crevice-nesting seabirds such as least and crested auklets Aethia pusilla and Aethia(More)
Some of the largest seabird concentrations in the northern hemisphere are intersected by major shipping routes in the Aleutian Archipelago. Risk is the product of the probability and the severity incidents in an area. We build a seasonally explicit model of seabird distribution and combine the densities of seabirds with an oil vulnerability index. We use(More)
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