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LIFETIME MEMBERS OF THE SOCIETY FOR NORTHWESTERN VERTEBRATE BIOLOGY 西北脊椎动物生物学学会终身会员
Pub Date : 2021-11-26 DOI: 10.1898/1051-1733-102.3.269
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引用次数: 0
ACTINEMYS MARMORATA (NORTHWESTERN POND TURTLE) FEEDING ON DICAMPTODON TENEBROSUS (COASTAL GIANT SALAMANDER) 西北塘龟捕食dicamptodon tenebrosus(海岸大鲵)
Pub Date : 2021-11-26 DOI: 10.1898/1051-1733-102.3.261
R. Peek, S. Kupferberg, A. Catenazzi, Philip Georgakakos, M. Power
Abstract When unexpected predator-prey interactions are observed, abiotic conditions can reveal insights about the ecology of the species involved. During one of the warmest months of May in the last 30 y (2008), we observed an adult Northwestern Pond Turtle, Actinemys marmorata, preying upon a paedomorphic Coastal Giant Salamander, Dicamptodon tenebrosus, in the South Fork Eel River. Compiled records of temperatures when moribund, bitten, or dead D. tenebrosus were found in the sunny mainstem river highlight their vulnerability when facing thermal stress beyond their usual habitat in cool shaded tributaries.
当观察到意想不到的捕食者-猎物相互作用时,非生物条件可以揭示有关物种生态学的见解。在过去30年(2008年)最温暖的5月份之一,我们观察到一只成年西北塘龟(actiemys marmorata)在南福克鳗鱼河(South Fork Eel River)捕食一只幼年海岸大鲵(Dicamptodon tenebrosus)。在阳光充足的主干河中发现的濒死、被咬伤或死亡的腾趾龙的温度汇编记录突出了它们在面临热压力时的脆弱性,这些温度超出了它们通常的栖息地,即阴凉的支流。
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引用次数: 0
MIXED EVIDENCE FOR NICHE CONSERVATISM IN MOUNTAIN BEAVER (APLODONTIA RUFA) LINEAGES 山狸(aplodontia rufa)谱系生态位保守性的混合证据
Pub Date : 2021-11-26 DOI: 10.1898/1051-1733-102.3.196
Jennie Jones Scherbinski, A. Piaggio, W. Bean
Abstract Range shifts in response to past climatic changes have been documented in a variety of species and have often resulted in the isolation of relict populations. Understanding how these isolated populations develop local adaptations or maintain their historic climatic niche is crucial to creating effective management plans in the face of current climate change. While Mountain Beavers (Aplodontia rufa) have endured through major climatic shifts in the past, they maintain physiological constraints that limit their distribution to cool, humid climates. Increasing temperatures since the last glacial maximum likely had a strong influence in reducing their range. The species now persists as 5 genetically distinct clades, but it is not clear to what extent climatic differences have driven genetic isolation compared to other factors like topography. We compared species-distribution models (SDMs) for the 5 clades of Mountain Beaver to understand whether this species tends towards niche conservatism or adapts to local climates. Presence points from the Global Biodiversity Information Facility were divided into clades and combined with climatic layers from BioClim to develop SDMs for each clade. Niche overlap was then compared to genetic relatedness between all pairings of clades. High temperatures were a limiting factor in distribution for all clades and, despite a low level of niche overlap at broad scales, Mountain Beavers appeared to display some level of niche conservatism. These landscape level SDMs showed that some clades do exist in a warmer climate than other Mountain Beavers; however, fine-scale models for the Point Arena subspecies suggested they persist by selecting the coolest places within that range. This suggests that niche overlap between clades may be higher than what is detected at the coarser scale. Further research is needed to understand the mechanisms limiting the distribution of these subspecies.
在过去的气候变化中,各种物种的范围变化已经被记录下来,并且经常导致孑遗种群的隔离。面对当前的气候变化,了解这些孤立的种群如何发展当地适应性或维持其历史气候生态位对于制定有效的管理计划至关重要。虽然山狸(Aplodontia rufa)在过去经历了重大的气候变化,但它们保持着生理上的限制,限制了它们在凉爽潮湿的气候下的分布。自最后一次冰期极大期以来,气温的升高很可能对缩小它们的活动范围产生了强烈影响。该物种现在以5个遗传上不同的分支存在,但与地形等其他因素相比,尚不清楚气候差异在多大程度上推动了遗传隔离。我们比较了山狸5个分支的物种分布模型(SDMs),以了解该物种是倾向于生态位保守主义还是适应当地气候。来自全球生物多样性信息设施的存在点被划分为支系,并结合BioClim的气候层为每个支系开发sdm。然后将生态位重叠与所有进化枝对之间的遗传亲缘关系进行比较。高温是所有进化支分布的限制因素,尽管在大尺度上生态位重叠程度很低,但山海狸似乎表现出一定程度的生态位保守性。这些景观水平的SDMs表明,一些分支确实存在于比其他山地海狸更温暖的气候中;然而,角竞技场亚种的精细模型表明,它们通过选择该范围内最冷的地方来生存。这表明,进化支之间的生态位重叠可能比在较粗的尺度上检测到的要高。需要进一步的研究来了解限制这些亚种分布的机制。
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引用次数: 0
WEST NILE VIRUS IMPACTS ON BLACK-BILLED MAGPIE POPULATIONS 西尼罗河病毒对黑嘴喜鹊种群的影响
Pub Date : 2021-11-26 DOI: 10.1898/1051-1733-102.3.239
Daniel M. Taylor, C. Trost
Abstract West Nile Virus (WNV) is an epizootic virus known to effectively kill Black-billed Magpies (Pica hudsonia). After WNV infection of humans appeared in the western United States, Black-billed Magpies birds per party-hours on Christmas Bird Counts (CBC) declined significantly. Trends for both CBC and Breeding Bird Surveys (BBS) shifted from positive before WNV infections of humans to negative during WNV infections, then rebounded to positive after WNV infection declined. Black-billed Magpies in Canada had no significant differences on CBC before or after WNV infections of humans. Canadian magpies had positive trends both before and after WNV infections on both CBC and BBS, but with negative trends during WNV infections. WNV invasion varied temporally across the continent, and Black-billed Magpies consistently showed significant and often dramatic declines soon after WNV invasion of a region. The southern Prairie region was severely hit, with Prairie states such as Kansas and Nebraska showing significant declines on CBC after WNV invasion, shifting from positive trends on CBC and BBS before invasion to negative trends during and after WNV invasion. WNV has potentially triggered or accelerated a retraction of Black-billed Magpie range in this region. The northern part of the Prairie region was less affected. Most southern and central Rocky Mountain, Intermountain, and Pacific region Black-billed Magpie populations showed significant negative effects from WNV infections. States in these regions with higher densities of Black-billed Magpies such as Colorado, Nevada, and Idaho showed significant dramatic declines during WNV invasion, but positive trends after WNV infections declined, a sign of recovering populations. California populations significantly declined with WNV invasion and have not recovered. Populations in northern and higher-elevation regions had little or no impact from WNV and populations were often stable or increasing.
摘要西尼罗病毒(WNV)是一种已知能有效杀死黑嘴喜鹊(Pica hudsonia)的动物传染病病毒。在美国西部出现人类感染西尼罗河病毒后,圣诞节鸟类计数(CBC)上黑嘴喜鹊每派对小时的鸟类数量显著下降。CBC和种鸟调查(BBS)的趋势从人类感染西尼罗河病毒前的阳性转变为西尼罗河病毒感染期间的阴性,然后在西尼罗河病毒感染下降后反弹为阳性。加拿大黑嘴喜鹊在人类感染西尼罗河病毒前后的CBC无显著差异。在感染西尼罗河病毒前后,加拿大喜鹊的CBC和BBS呈阳性趋势,而在西尼罗河病毒感染期间呈阴性趋势。西尼罗河病毒的入侵在整个大陆的时间上是不同的,在西尼罗河病毒入侵一个地区后,黑嘴喜鹊一直表现出显著的、经常是戏剧性的下降。南部草原地区受影响较为严重,堪萨斯州和内布拉斯加州等草原州的CBC和BBS在西尼罗河病毒入侵后出现明显下降,从入侵前的正趋势转变为入侵期间和入侵后的负趋势。西尼罗河病毒可能引发或加速了该地区黑嘴喜鹊活动范围的缩小。草原北部地区受影响较小。大部分南部和中部落基山脉、山间和太平洋地区的黑嘴喜鹊种群受到西尼罗河病毒感染的负面影响显著。在这些黑嘴喜鹊密度较高的地区,如科罗拉多州、内华达州和爱达荷州,在西尼罗河病毒入侵期间,黑嘴喜鹊数量急剧下降,但西尼罗河病毒感染下降后,黑嘴喜鹊数量呈上升趋势,这是种群恢复的迹象。随着西尼罗河病毒的入侵,加利福尼亚的种群数量显著下降,并没有恢复。北部和高海拔地区的种群很少或没有受到西尼罗河病毒的影响,种群数量通常稳定或增加。
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引用次数: 0
NINETEEN ROCKY MOUNTAIN ELK (CERVUS CANADENSIS NELSONI) KILLED IN AN AVALANCHE IN THE THREE SISTERS WILDERNESS 19头落基山麋鹿(cervus canadensis nelsoni)在三姐妹荒野的一次雪崩中丧生
Pub Date : 2021-11-26 DOI: 10.1898/1051-1733-102.3.265
Mike J Skladanowski, E. Weidner, Jamie L Bowles, M. Hebblewhite
Abstract On 10 August 2018 we investigated reports of dead Rocky Mountain Elk (Cervus canadensis nelsoni) melting out of the snow above No Name Lake in the Three Sisters Wilderness, Oregon. We identified 15 elk partially lodged in the snow and 4 elk submerged in the lake. The elk were scattered across the slope and had suffered multiple compound fractures of the leg bones, suggestive of a traumatic incident. Soft tissues, such as eyes and tongue, were well preserved and had not been subject to scavenging or extensive decomposition
2018年8月10日,我们调查了俄勒冈州三姐妹荒野无名湖(No Name Lake)上方积雪融化的落基山麋鹿尸体。我们发现15头麋鹿部分陷在雪地里,4头麋鹿淹没在湖里。这些麋鹿散落在山坡上,腿骨上有多处复合性骨折,表明这是一次创伤性事件。软组织,如眼睛和舌头,保存得很好,没有受到腐食或广泛分解
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引用次数: 0
REVIEWERS FOR VOLUME 102 第102卷的审稿人
Pub Date : 2021-11-26 DOI: 10.1898/1051-1733-102.3.270
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引用次数: 0
DISTINCT WHITE FACIAL-FUR PATTERNS OF DEER MOUSE (PEROMYSCUS MANICULATUS) POPULATIONS IN NORTHERN NEVADA 内华达北部鹿鼠(peromyscus maniculatus)种群的明显白色面部皮毛图案
Pub Date : 2021-11-26 DOI: 10.1898/1051-1733-102.3.254
D. C. Miles, Kelsey R Burrus, K. Shoemaker
Abstract We report photo documentation of a newly discovered fur variation on the face of American Deer Mice, Peromyscus maniculatus, in populations across northern Nevada. American Deer Mice usually have all-brown facial fur with dark-colored ears, whereas these novel records show white fur patches at the base of the ears, sometimes with bicolored ears and white fur extending behind, and more rarely with a white strip of fur down the middle of the face. Across all field sites, we captured 1685 Deer Mice; of these, 216 had some variation of the white facial fur patterns. These facial patterns are most prominent in northeastern Nevada, comprising 13 to 16% of all Deer Mice captured.
摘要:我们报道了在内华达州北部种群中发现的美洲鹿鼠(Peromyscus maniculatus)面部皮毛变异的照片记录。美国鹿鼠的面部毛通常是全棕色的,耳朵是深色的,而这些新记录显示耳朵底部有白色的斑块,有时耳朵是双色的,后面有白色的毛,更罕见的是脸中间有白色的毛。在所有的现场,我们捕获了1685只鹿鼠;其中,216只狗有不同的白色面部皮毛图案。这些面部图案在内华达州东北部最为突出,占捕获鹿鼠总数的13%至16%。
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引用次数: 0
LITTLE BROWN MYOTIS ACTIVITY PATTERNS IN SOUTH-CENTRAL ALASKA 阿拉斯加中南部的小棕色肌炎活动模式
Pub Date : 2021-11-26 DOI: 10.1898/1051-1733-102.3.216
M. Snively, G. Pendleton, K. Christie, K. Blejwas
Abstract In this study, we investigated how Little Brown Myotis (Myotis lucifugus), North America's northernmost bat species, adjusted to variable spring and autumn conditions and very little darkness during the boreal summer. We recorded bat activity around Anchorage and the lower Matanuska-Susitna Valley, Alaska. Initiation of bat activity in the spring varied among years and was affected by minimum nightly temperatures in late April and, to a lesser extent, precipitation. Cessation of bat activity in the autumn was consistent among years, with a weak association with early-October minimum temperature. During summer, bat activity was highest on warm, clear nights, but was reduced by wind or rain. Bat activity was positively related to open water and forest cover and negatively related to human development. Most bat activity occurred between sunset and sunrise, even during very short nights in mid-summer. Although there was some activity prior to sunset, bat activity after sunrise was very rare. Pre-sunset bat activity was almost exclusively at sites with high forest cover. After sunset, moderately forested sites were also used, but sites with little forest cover were rarely used before or after sunset.
摘要:本研究研究了北美最北端的蝙蝠物种小棕蝠(Myotis lucifugus)如何适应多变的春秋季环境和北方夏季很少的黑暗。我们记录了阿拉斯加安克雷奇和马塔努斯卡-苏西特纳山谷下游的蝙蝠活动。蝙蝠在春季开始活动的年份各不相同,受4月下旬夜间最低气温的影响,在较小程度上受降水的影响。蝙蝠在秋季停止活动的年份是一致的,与10月初的最低气温有较弱的关联。在夏季,蝙蝠活动在温暖、晴朗的夜晚最高,但受到风或雨的影响而减少。蝙蝠活动与开阔水域和森林覆盖呈正相关,与人类发展负相关。大多数蝙蝠的活动发生在日落和日出之间,即使是在仲夏非常短的夜晚。虽然在日落之前有一些活动,但日出之后的蝙蝠活动非常罕见。日落前蝙蝠活动几乎只发生在森林覆盖率高的地点。日落后,森林覆盖率适中的地点也会被利用,但在日落后很少利用森林覆盖率低的地点。
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引用次数: 1
DENSITY OF FISHERS (PEKANIA PENNANTI) AT THE SOUTHWESTERN EDGE OF THE SPECIES' RANGE IN BRITISH COLUMBIA
Pub Date : 2021-11-26 DOI: 10.1898/1051-1733-102.3.232
Lawrence R. Davis, R. Weir
Abstract Fishers (Pekania pennanti) are a species of conservation concern in central British Columbia for which distribution and abundance information is needed to help guide conservation efforts. We conducted a DNA-based spatial capture-recapture study in the Bridge River watershed to gain a better understanding of their density in the dry forests at the southwestern edge of the species' range in the province. We established and monitored baited hair traps at 152 sites spread throughout 771.4 km2 over 4 mo in early 2012, detecting 8 individual Fishers (3 females, 5 males) at 16 different sites. We used spatially explicit capture-recapture methods to estimate the density of Fishers to be 13.1 Fishers/1000 km2 (95% CI: 6.3 to 27.4 Fishers/1000 km2) when we constrained the plausible sampling area to biogeoclimatic zones that are known to support Fishers. This study provides resource managers and trappers with a snapshot of local Fisher densities at the southern edge of the species range in British Columbia that will help estimate sustainable harvest levels and refine the estimate of the provincial population of Fishers.
摘要:佩卡尼亚(Pekania pennanti)是不列颠哥伦比亚省中部一个受保护的物种,其分布和丰度信息需要帮助指导保护工作。我们在桥河流域进行了一项基于dna的空间捕获-再捕获研究,以更好地了解其在该省物种范围西南边缘的干燥森林中的密度。2012年初,在4个月的时间里,我们在771.4平方公里的152个地点建立并监测了诱饵毛发陷阱,在16个不同的地点发现了8名个体渔民(3名雌性,5名雄性)。我们使用空间明确的捕获-再捕获方法来估计渔民的密度为13.1渔民/1000平方公里(95% CI: 6.3至27.4渔民/1000平方公里),当我们将合理的采样区域限制在已知支持渔民的生物地理气气区时。这项研究为资源管理者和捕鲸者提供了不列颠哥伦比亚省物种范围南部边缘当地渔民密度的快照,这将有助于估计可持续收获水平,并改进对该省渔民人口的估计。
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引用次数: 0
LIMB MALFORMATION IN A FOOTHILL YELLOW-LEGGED FROG (RANA BOYLII) FROM SONOMA COUNTY, CALIFORNIA 加州索诺玛县一只山麓黄腿蛙的肢体畸形
Pub Date : 2021-11-26 DOI: 10.1898/1051-1733-102.3.258
J. Alvarez, Kyla M. Garten, David G. Cook
Abstract Reports of limb malformations in amphibians have increased in the last 20 y. In California, this includes anuran species in the families Hylidae and Ranidae. While working with Foothill Yellow-legged Frogs in Sonoma County, we observed a malformation of a hind limb in 1 individual, the source of which was undetermined. We believe this to be only the second such report of a malformation in this declining species.
在过去的20年里,关于两栖动物肢体畸形的报道有所增加。在加州,这包括了水螅科和蛙科的无脊椎动物。在索诺玛县与山麓黄腿蛙一起工作时,我们观察到1只蛙的后肢畸形,其来源尚未确定。我们相信这只是第二次这样的畸形报告,在这个日益衰落的物种。
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引用次数: 0
期刊
Northwestern Naturalist
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