Nesting habitat characteristics of Marbled Murrelets occurring in near-shore waters of the Olympic Peninsula, Washington

2016 ◽  
Vol 87 (2) ◽  
pp. 162-175 ◽  
Author(s):  
Randall J. Wilk ◽  
Martin G. Raphael ◽  
Thomas D. Bloxton
Keyword(s):  
Habitat Characteristics ◽  
Nesting Habitat ◽  
Olympic Peninsula ◽  
Near Shore ◽  
Marbled Murrelets

TRENDS IN RADAR-BASED COUNTS OF MARBLED MURRELETS ON THE OLYMPIC PENINSULA, WASHINGTON, 1996–2004

The Condor ◽  
2006 ◽  
Vol 108 (4) ◽  
pp. 936 ◽  
Author(s):  
Brian A. Cooper ◽  
Martin G. Raphael ◽  
M. Zachariah Peery
Keyword(s):  
Olympic Peninsula ◽  
Marbled Murrelets

Nesting Habitat Characteristics of the Marbled Murrelet in Central California Redwood Forests

2006 ◽  
Vol 70 (4) ◽  
pp. 939-946 ◽  
Author(s):  
LAUREN M. BAKER ◽  
M. ZACHARIAH PEERY ◽  
ESTHER E. BURKETT ◽  
STEVEN W. SINGER ◽  
DAVID L. SUDDJIAN ◽  
...  
Keyword(s):  
Habitat Characteristics ◽  
Nesting Habitat ◽  
Central California ◽  
Marbled Murrelet ◽  
Redwood Forests

Productivity and Nesting Habitat Characteristics of the Black Tern in Northern New York

1997 ◽  
Vol 20 (3) ◽  
pp. 596 ◽  
Author(s):  
Irene M. Mazzocchi ◽  
Jeanne M. Hickey ◽  
Robert L. Miller
Keyword(s):  
New York ◽  
Habitat Characteristics ◽  
Nesting Habitat ◽  
Black Tern

scholarly journals Habitat modelling locates nesting areas of the Endangered Black-capped Petrel Pterodroma hasitata on Hispaniola and identifies habitat loss

2020 ◽  
pp. 1-18
Author(s):  
YVAN G. SATGÉ ◽  
ERNST RUPP ◽  
ADAM BROWN ◽  
PATRICK G. R. JODICE
Keyword(s):  
Habitat Loss ◽  
Forest Fires ◽  
Environmental Variables ◽  
Linear Models ◽  
Habitat Characteristics ◽  
Tree Cover ◽  
Suitable Habitat ◽  
Nesting Habitat ◽  
Understorey Vegetation ◽  
Breeding Sites

Summary The Black-capped Petrel or Diablotin Pterodroma hasitata has a fragmented and declining population estimated at c.1,000 breeding pairs. On land, the species nests underground in steep ravines with dense understorey vegetation. The only confirmed breeding sites are located in the mountain ranges of Hispaniola in the Caribbean, where habitat loss and degradation are continuing threats. Other nesting populations may still remain undiscovered but, to locate them, laborious in situ nest searches must be conducted over expansive geographical areas. To focus nest-search efforts more efficiently, we analysed the environmental characteristics of Black-capped Petrel nesting habitat and modeled suitable habitat on Hispaniola using openly available environmental datasets. We used a univariate generalized linear model to compare the habitat characteristics of active Black-capped Petrel nests sites with those of potentially available sites (i.e. random pseudo-absences). Elevation, distance to coast, and the influence of tree cover and density emerged as important environmental variables. We then applied multivariate generalized linear models to these environmental variables that showed a significant relationship with petrel nesting activity. We used the top performing model of habitat suitability model to create maps of predicted suitability for Hispaniola. In addition to areas of known petrel activity, the model identified possible nesting areas for Black-capped Petrels in habitats not previously considered suitable. Based on model results, we estimated the total area of predicted suitable nesting habitat for Black-capped Petrels on Hispaniola and found that forest loss due to hurricanes, forest fires, and encroachment from agriculture had severely decreased availability of predicted suitable habitat between 2000 and 2018.

scholarly journals Landscape-Scale Relationships Between Abundance of Marbled Murrelets and Distribution of Nesting Habitat

The Condor ◽  
2002 ◽  
Vol 104 (2) ◽  
pp. 331-342 ◽  
Author(s):  
Martin G. Raphael ◽  
Diane Evans Mack ◽  
Brian A. Cooper
Keyword(s):  
Spatial Configuration ◽  
Nesting Habitat ◽  
Road Density ◽  
Forest Patch ◽  
Brachyramphus Marmoratus ◽  
Marbled Murrelet ◽  
Restoration Technique ◽  
Patch Density ◽  
Density Patch ◽  
Marbled Murrelets

AbstractWe used radar to count numbers of Marbled Murrelets (Brachyramphus marmoratus) flying inland within 10 river drainages on the Olympic Peninsula, Washington, during 1998–2000. We tested whether the numbers of murrelets entering drainages could be predicted from the amount and spatial configuration of low-elevation, late-seral forest (potential murrelet nesting habitat) within drainages. The maximal number of murrelet radar targets was positively correlated with the amount of late-seral forest in each of the three years sampled; this relationship persisted in 1999 and 2000 when controlling for drainage size. Murrelet radar counts were not correlated with the combined amounts of harvested, developed, and agricultural lands in any year. Numbers of murrelets increased as the amount of core area of late-seral forest and proximity of patches increased, and decreased with increasing amounts of edge of late-seral patches. Numbers were not correlated with the percent of late-seral forest, patch density, patch size, road density, or the overall diversity of all habitat types within landscapes. Neither the maximal nor the mean number of inbound Marbled Murrelets differed among years; the effect of year was small relative to the effect of habitat on murrelet numbers. Our results suggest that changes in the amount or distribution of nesting habitat should result in detectable changes in murrelet numbers at the scale of individual drainages. Thus, the amount and distribution of nesting habitat may play a role in the regulation of Marbled Murrelet populations, supporting the contention that providing nesting habitat is an effective conservation and restoration technique for this species.Relaciones a Escala del Paisaje entre la Abundancia de Brachyramphus marmoratus y la Distribución de Hábitat de NidificaciónResumen. Durante 1998–2000 utilizamos radares para contar el número de individuos de Brachyramphus marmoratus que volaron tierra adentro a lo largo de 10 cuencas de ríos que desaguan en la Península Olímpica, Washington, USA. Evaluamos si el número de individuos de B. marmoratus que entran por las cuencas puede ser predicho por la cantidad y configuración espacial de bosques de baja elevación que se encuentran en estadíos sucesionales tardíos (potencial hábitat de nidificación para estas aves) en cada cuenca. En cada uno de los tres años, el máximo número de individuos de B. marmoratus detectados estuvo positivamente correlacionado con la cantidad de bosque sucesional tardío; luego de controlar por el área de las cuencas esta relación persistió en 1999 y 2000. Durante todos los años, los conteos de B. marmoratus mediante radares no se correlacionaron con la cantidad combinada de tierras cosechadas, desarrolladas y agrícolas. El número de individuos de B. marmoratus aumentó con el área núcleo de bosque sucesional tardío y con el aumento de la proximidad entre parches, y decreció con el aumento de la cantidad de borde en los parches sucesionales tardíos. El número de aves no se correlacionó con el porcentaje de bosque sucesional tardío, densidad y área de parches, densidad de calles, ni diversidad total de todos los tipos de hábitats en el paisaje. Ni el número máximo ni el promedio de individuos de B. marmoratus que volaron en dirección tierra adentro diferió entre años; el efecto del año fue pequeño en comparación con el efecto del hábitat o del número de aves. Nuestros resultados sugieren que los cambios en la cantidad o distribución de hábitat para la nidificación deberían resultar en cambios detectables en el número de individuos de B. marmoratus a la escala individual de cada cuenca. Por lo tanto, la cantidad y distribución de hábitat para nidificación puede jugar un papel importante en la regulación de poblaciones de B. marmoratus, lo cual apoya la idea que proveer de hábitat para nidificación es una técnica efectiva para la conservación y restauración de esta especie.

scholarly journals Trends in Radar-Based Counts of Marbled Murrelets on the Olympic Peninsula, Washington, 1996–2004

The Condor ◽  
2006 ◽  
Vol 108 (4) ◽  
pp. 936-947
Author(s):  
Brian A. Cooper ◽  
Martin G. Raphael ◽  
M. Zachariah Peery
Keyword(s):  
Power Analysis ◽  
High Probability ◽  
Sampling Design ◽  
Breeding Population ◽  
Olympic Peninsula ◽  
San Juan Islands ◽  
Marbled Murrelet ◽  
Marbled Murrelets ◽  
Oceanographic Conditions ◽  
Over Time

AbstractAbstractThe Marbled Murrelet (Brachyramphusmarmoratus) is a highprofile, federally threatened seabird, but noreliable estimates of population trends at inlandbreeding areas exist for this species. We conductedland-based radar studies of Marbled Murrelets at3–7 sites on the Olympic Peninsula,Washington, in 1996–2002 and 2004 to estimatepopulation changes and to examine relationshipsbetween our counts and oceanographic conditions,murrelet productivity, and regional at-sea countsof murrelets. Morning radar counts of murreletsvaried significantly among and within sites but didnot decline from 1996–2004, suggesting thatthe inland breeding population of murrelets isstable in this area. A retrospective power analysisindicated that we had a 25% and 56%chance of detecting 2% and 4% annualdeclines, respectively. Thus, if relatively smallannual declines did occur during our study period,there is a high probability that they would havegone undetected, even though they could add up to abiologically important decline over time. It isunlikely that murrelets on the Olympic Peninsuladeclined by ≥6% annually, however,because retrospective analyses indicated that powerto detect such declines was >88%. Therewas no significant relationship between radarcounts and at-sea counts or productivity ofmurrelets in the nearby San Juan Islands during thestudy period. We also did not detect a relationshipbetween radar counts and mean sea-surfacetemperatures or the Northern Oscillation Index,suggesting that variation in oceanographicconditions (e.g., the strong 1998 ElNiño event) was not associated withvariation in morning radar counts of MarbledMurrelets. A prospective power analysis indicatedthat small (2%–4%)annual declines could be detected with reasonablyhigh power (≥80%) with thecurrent radar sampling design by extending thestudy to 11–15 years.

scholarly journals Radar-Based Monitoring of Marbled Murrelets

The Condor ◽  
2001 ◽  
Vol 103 (2) ◽  
pp. 219-229 ◽  
Author(s):  
Brian A. Cooper ◽  
Martin G. Raphael ◽  
Diane Evans Mack
Keyword(s):  
General Pattern ◽  
Cost Effective ◽  
Error Rates ◽  
Olympic Peninsula ◽  
Brachyramphus Marmoratus ◽  
Marbled Murrelet ◽  
Major River ◽  
Marbled Murrelets ◽  
River Valleys ◽  
Index Of Abundance

Abstract We used radar to measure daily, monthly, and annual patterns of Marbled Murrelet (Brachyramphus marmoratus) abundance and movements at 12 major river valleys in the Olympic Peninsula of Washington. Landward movements of murrelets peaked from ∼75 min to ∼20 min before sunrise, followed by a seaward exodus from ∼20 min before sunrise to ∼65 min after sunrise. This general pattern of a landward movement followed by a seaward exodus varied little, but the timing of the seaward exodus gradually became later from May to July. Within a morning, numbers of landward radar targets averaged twice the numbers of seaward targets, and morning counts were approximately five times evening counts. Species identification error rates were lower for landward radar counts than for seaward counts. Radar counts varied through the season, with numbers increasing from May to July, then dropping in August. Seaward counts were more variable than landward counts. There was wide overlap among months in the amount of daily variation in both landward and seaward counts. Radar appears to be a powerful, cost-effective, and non-intrusive tool that can establish an index of abundance for murrelets at specific inland breeding areas.

scholarly journals Struktur Vegetasi dan Karakteristik Habitat Peneluran Penyu Hijau (Chelonia mydas) di Kawasan Konservasi Penyu Pangumbahan Sukabumi

2018 ◽  
Vol 4 (1) ◽  
pp. 36
Author(s):  
Yorianta Sasaerila ◽  
Dewi Elfidasari ◽  
Muhammad Qeis Tsal Sabil
Keyword(s):  
Green Turtle ◽  
Chelonia Mydas ◽  
Habitat Characteristics ◽  
Physical Analysis ◽  
Nesting Habitat ◽  
Conservation Area ◽  
Terminalia Catappa ◽  
Large Trees ◽  
C 30 ◽  
Commercial Trade

<p><em>Abstrak</em> - <strong>Penurunan populasi penyu hijau yang terjadi secara terus menerus dari tahun ke tahun, menyebabkan penyu termasuk dalam daftar CITES Appendiks I plus zero <em>quota of wild capture for commercial trade</em> saat ini. Oleh karena itu perlu dilakukan upaya konservasi yang baik untuk menjaga kelestarian penyu hijau. Salah satu proses yang penting diketahui bagi kelangsungan sirkulasi hidup penyu adalah proses bertelur. Oleh karena itu perlu diketahui </strong><strong>kondisi</strong><strong> pantai yang menjadi habitat penyu bertelur. Penelitian ini bertujuan untuk melakukan identifikasi terhadap jenis dan struktur vegetasi, serta karakteristik habitat </strong><strong>bertelur </strong><strong>penyu hijau di kawasan konservasi penyu pangumbahan sukabumi</strong><strong>. A</strong><strong>nalisa kuantitatif </strong><strong>yang dilakukan </strong><strong>berupa penghitungan indeks nilai penting vegetasi dan analisa fisik lingkungan sekitar </strong><strong>habitat bertelur</strong><strong> penyu. Berdasarkan letak sarang telur penyu, ditemukan sebanyak 12 spesies vegetasi yang terdiri dari 4 jenis berupa pohon besar, 3 jenis berupa pohon kecil, 3 jenis berupa perdu, 3 jenis berupa herba, 1 jenis berupa semak. terdapat lebih dari 3 jenis vegetasi yang sangat penting di pangumbahan yaitu <em>Callophyllum inophyllum, Terminalia catappa, Ipoemoea pes-caprae</em>. Karakteristik fisik pantai pangumbahan juga masih mendukung proses bertelur penyu hijau. Pantai Pangumbahan memiliki rata- rata suhu 20 <sup>o</sup>C-30 <sup>o</sup>C, intensitas cahaya rendah (0) dan kecepatan angin 2,2 knots serta komposisi pasir yang sesuai.</strong></p><p> </p><p><strong><em>Kata </em></strong><strong><em>K</em></strong><strong><em>unci</em></strong><em> -</em><em> </em><em>H</em><em>abitat </em><em>B</em><em>ertelur, </em><em>P</em><em>enyu </em><em>H</em><em>ijau, </em><em>V</em><em>egetasi, </em><em>Pantai </em><em>Pangumbahan</em><em>, Karakter Fisik</em></p><p align="center"><strong> </strong></p><p><em>Abstract</em> - <strong>The decline in green turtle populations that occur continuously from year to year, causing turtles to be included in the list of CITES Appendix I plus zero quotes of wild capture for commercial trade today. Therefore it is necessary to do a good conservation efforts to maintain the sustainability of green turtles. Therefore it is necessary to know the condition of the beach that turtles laying habitat. This study aims to identify the type and structure of vegetation, as well as the green turtle nesting habitat characteristics in turtle conservation area Pangumbahan sukabumi. Quantitative analysis is done by calculating the index of vegetation important values and physical analysis of the environment around turtle nesting habitat. Based on the location of turtle egg nest, found 12 species of vegetation consisting of 4 types of large trees, 3 species of small trees, 3 types of shrubs, 3 types of herbs, 1 species of shrubs. There are more than 3 important vegetation types in pangumbahan namely Callophyllum inophyllum, Terminalia catappa, Ipoemoea pes-caprae. Physical characteristics of pangumbahan beach also still support the process of laying green turtle. Pangumbahan Beach has an average temperature of 20<sup>o</sup>C-30<sup>o</sup>C, low light intensity (0) and wind speed of 2.2 knots and suitable sand composition.</strong></p><p><strong> </strong></p><p><strong><em>Keywords - </em></strong><em>Habitat lay eggs, Green Turtle, Vegetation, Pangumbahan Beach, Physical Character</em></p>

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