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2 results for “Brachyramphus marmoratus”
Characterizing the diet of a threatened seabird, the Marbled Murrelet (Brachyramphus marmoratus), using high-throughput sequencing
<p class="blockindent">Understanding prey consumption patterns is critical to understanding the ways in which seabirds cope with a changing ocean. However, characterizing the dietary habitats of seabirds can be challenging. In this study, we investigated the diet of the Marbled Murrelet (<span class="bodyitalic"><em>Brachyramphus marmoratus</em>) </span>population that lives in waters off California, Oregon, and Washington, USA, using fecal DNA, custom metabarcoding, and high-throughput sequencing. Murrelets were captured at sea by dip-netting at night. Across this region, murrelets consumed highly diverse prey types including 17 fish species and 10 invertebrate species, in accord with previous work indicating the species' forage on a wide range of prey. Pacific Herring (<em><span class="bodyitalic">Clupea pallasii</span></em><span class="bodyitalic">)</span> was the most common prey in Washington and Oregon (frequency of occurrence = 0.84 and 0.69, respectively), replaced by Northern Anchovy <span class="bodyitalic">(Engraulis <em>mordax</em>) </span>in California (frequency of occurrence = 0.77). In Oregon, where our sample size was sufficient, diet composition differed between the 2017 and 2018 breeding seasons, with an apparent decline in the proportional consumption of energy-dense prey. Common and energy-dense prey were consumed in equal proportions by males and females, perhaps because of foraging in the same habitat. Diet did not vary between breeders and non-breeders. Our study offers the first detailed report on the diet of adult Marbled Murrelets in waters where they are listed as Threatened by the US federal government. This indicates that managing fisheries and conserving spawning habitat for high-occurrence prey species could benefit murrelet populations.</p>
Characterizing the diet of a threatened seabird, the Marbled Murrelet (Brachyramphus marmoratus), using high-throughput sequencing
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