Marbled Murrelet (Brachyramphus marmoratus)

Nelson, S. Kim

doi:10.2173/bna.276

Cited by 42 publications

(70 citation statements)

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“…Statistical tests are given here only when they are not available in the cited references. The multi-authored compendium produced by Ralph et al (1995a) and the more condensed review by Nelson (1997) remain excellent resources, but there has been much ground-breaking research in BC and the U.S. since their publication. This review is therefore an attempt at updating these publications with information relevant to BC.…”

Section: Reasons For the Conservation Assessment And Biological Reviementioning

confidence: 99%

“…Marbled Murrelets are restricted to the Pacific coast of North America, with breeding occurring from Attu and other islands of the Aleutian archipelago, through southern Alaska, BC, Washington, and Oregon, to Santa Cruz county in central California (Ralph et al 1995b, Nelson 1997. The bulk of the population is found in southern and south-eastern Alaska and BC (see Population Size; sections 3.2 and 3.4 below).…”

Section: Geographical Distributionmentioning

confidence: 99%

“…The winter range is poorly documented but includes most of the marine areas used in the breeding season, and extends south into southern California (Nelson 1997). …”

Section: Geographical Distributionmentioning

confidence: 99%

“…The species has a diverse diet, but small schooling fish and large pelagic crustaceans (euphausiids, mysids, amphipods) are the main prey items (see summaries by Sealy 1975a, Carter 1984, Vermeer et al 1987, Burkett 1995, Nelson 1997, Day and Nigro 2000. The most common fish are Pacific sand lance (Ammodytes hexapterus), northern anchovy (Engraulis mordax), immature Pacific herring (Clupea harengus), capelin (Mallotus villosus), and smelt (Hypomesus sp.).…”

Section: Diet Nutrition and Energeticsmentioning

confidence: 99%

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Relating Microclimate to Epiphyte Availability: Edge Effects on Nesting Habitat Availability for the Marbled Murrelet

Rooyen

Malt²,

Lank

2011

Northwest Science

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Section: Reasons For the Conservation Assessment And Biological Reviementioning

confidence: 99%

Section: Geographical Distributionmentioning

confidence: 99%

“…The winter range is poorly documented but includes most of the marine areas used in the breeding season, and extends south into southern California (Nelson 1997). …”

Section: Geographical Distributionmentioning

confidence: 99%

Section: Diet Nutrition and Energeticsmentioning

confidence: 99%

See 2 more Smart Citations

Relating Microclimate to Epiphyte Availability: Edge Effects on Nesting Habitat Availability for the Marbled Murrelet

Rooyen

Malt²,

Lank

2011

Northwest Science

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“…The Marbled Murrelet (Brachyramphus marmoratus) is a northeastern Pacific seabird that utilizes coastal old-growth forest between southeast Alaska and central California for nesting habitat (Nelson 1997, Burger 2002). The species is classified as "threatened" under the Species at Risk Act in Canada, and southern populations have similar status under the Endangered Species Act in the United States, recently reconfirmed (USFWS 2009).…”

Section: Introductionmentioning

confidence: 99%

Patch Scale Nest-Site Selection by Marbled Murrelets (Brachyramphus marmoratus)

Silvergieter¹,

Lank²

2011

ACE

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ABSTRACT. The Marbled Murrelet (Brachyramphus marmoratus) is a threatened alcid that nests almost exclusively in old-growth forests along the Pacific coast of North America. Nesting habitat has significant economic importance. Murrelet nests are extremely difficult and costly to find, which adds uncertainty to management and conservation planning. Models based on air photo interpretation of forest cover maps or assessments by low-level helicopter flights are currently used to rank presumed Marbled Murrelet nesting habitat quality in British Columbia. These rankings are assumed to correlate with nest usage and murrelet breeding productivity. Our goal was to find the models that best predict Marbled Murrelet nesting habitat in the ground-accessible portion of the two regions studied. We generated Resource Selection Functions (RSF) using logistic regression models of ground-based forest stand variables gathered at plots around 64 nests, located using radio-telemetry, versus 82 random habitat plots. The RSF scores are proportional to the probability of nests occurring in a forest patch. The best models differed somewhat between the two regions, but include both ground variables at the patch scale (0.2-2.0 ha), such as platform tree density, height and trunk diameter of canopy trees and canopy complexity, and landscape scale variables such as elevation, aspect, and slope. Collecting ground-based habitat selection data would not be cost-effective for widespread use in forestry management; air photo interpretation and low-level aerial surveys are much more efficient methods for ranking habitat suitability on a landscape scale. This study provides one method for ground-truthing the remote methods, an essential step made possible using the numerical RSF scores generated herein.RÉSUMÉ. Le Guillemot marbré (Brachyramphus marmoratus) est un Alcidé menacé qui niche presque exclusivement dans les vieilles forêts de la côte nord-américaine du Pacifique. L'étude de son habitat de nidification exige des ressources financières importantes. En effet, les nids de guillemots sont très difficiles à trouver, de sorte que cette activité est coûteuse, conférant à la planification de l'aménagement et à la conservation un caractère incertain. Les modèles fondés sur des cartes du couvert forestier provenant de la photointerprétation ou encore sur des évaluations faites à partir de vols en hélicoptère à basse altitude sont actuellement utilisés pour classer l'habitat de nidification des Guillemots marbrés en ColombieBritannique en fonction de sa qualité présumée. Cette approche repose sur la présomption que ce classement est corrélé à l'occupation des nids et à la productivité des guillemots. L'objectif de cette étude était de déterminer les meilleurs modèles pour prévoir l'habitat de nidification des guillemots dans la partie accessible au sol des deux régions étudiées. Nous avons élaboré des fonctions de sélection des ressources (FSR) au moyen de modèles de régression logistique, à partir de variables de peuplements forestiers récoltées a...

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Ecological significance of residual exposures and effects from theExxon Valdezoil spill

Harwell¹,

Gentile²

2006

Integr Envir Assess & Manag

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An ecological significance framework is used to assess the ecological condition of Prince William Sound (PWS), Alaska, USA, in order to address the current management question: 17 y following the Exxon Valdez oil spill (EVOS), are there any remaining and continuing ecologically significant exposures or effects on the PWS ecosystem caused by EVOS? We examined the extensive scientific literature funded by the Exxon Valdez Trustees or by ExxonMobil to assess exposures and effects from EVOS. Criteria to assess ecological significance include whether a change in a valued ecosystem component (VEC) is sufficient to affect the structure, function, and/or health of the system and whether such a change exceeds natural variability. The EVOS occurred on 24 March 1989, releasing over 250,000 barrels of crude oil into PWS. Because PWS is highly dynamic, the residual oil was largely eliminated in the first few years, and now only widely dispersed, highly weathered, or isolated small pockets of residual contamination remain. Many other sources of polycyclic aromatic hydrocarbons (PAHs) exist in PWS from past or present human activities or natural oil seeps. Multiple-lines-of-evidence analyses indicate that residual PAHs from EVOS no longer represent an ecologically significant exposure risk to PWS. To assess the ecological significance of any residual effects from EVOS, we examined the literature on more than 20 VECs, including primary producers, filter feeders, fish and bird primary consumers, fish and bird top predators, a bird scavenger, mammalian primary consumers and top predators, biotic communities, ecosystem-level properties of trophodynamics and biogeochemical processes, and landscape-level properties of habitat mosaic and wilderness quality. None of these has any ecologically significant effects that are detectable at present, with the exception of 1 pod of orcas and possibly 1 subpopulation of sea otters; however, in both those cases, PWS-wide populations appear to have fully recovered. Many other stressors continue to affect PWS adversely, including climate and oceanographic variability, increased tourism and shipping, invasive species, the 1964 earthquake, and overexploitation of marine resources, with associated cascading effects on populations of PWS fish and predators. We conclude that the PWS ecosystem has now effectively recovered from EVOS.

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Marbled Murrelet (Brachyramphus marmoratus)

Cited by 42 publications

References 0 publications

Relating Microclimate to Epiphyte Availability: Edge Effects on Nesting Habitat Availability for the Marbled Murrelet

Relating Microclimate to Epiphyte Availability: Edge Effects on Nesting Habitat Availability for the Marbled Murrelet

Patch Scale Nest-Site Selection by Marbled Murrelets (Brachyramphus marmoratus)

Ecological significance of residual exposures and effects from theExxon Valdezoil spill

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