The Canadian Field-Naturalist最新文献_第10页

Paedomorphic Blotched Tiger Salamander (Ambystoma mavortium melanostictum) in ovo counts, British Columbia, Canada 加拿大不列颠哥伦比亚省卵群中的紫胚斑虎蝾螈(Ambystoma mavortium melanotictum)

The Canadian Field-Naturalist Pub Date : 2022-04-28 DOI: 10.22621/cfn.v135i4.2116

S. Ashpole, Marissa Nati

{"title":"Paedomorphic Blotched Tiger Salamander (Ambystoma mavortium melanostictum) in ovo counts, British Columbia, Canada","authors":"S. Ashpole, Marissa Nati","doi":"10.22621/cfn.v135i4.2116","DOIUrl":"https://doi.org/10.22621/cfn.v135i4.2116","url":null,"abstract":"Reproductively mature larval morphs, known as paedogens, are a rare occurrence in Blotched Tiger Salamander (Ambystoma mavortium melanostictum). The Southern Mountain population of this subspecies, confined to the southern interior of British Columbia, is listed federally as Endangered and has been facing increasing pressures from anthropogenic stressors in both their aquatic and terrestrial landscapes. In 2017, we examined a subset of 36 frozen Blotched Tiger Salamander paedogens collected in September 1985 after rotenone treatment in preparation for a recreational fishery near Oliver, British Columbia. We estimated total in ovo numbers in nine gravid individuals to gain insight into paedogen reproductive condition. The number of eggs per individual averaged 227 ± 109 [SD]; range 28–421), with larger dark eggs accounting for 133 ± 69 and smaller pale eggs (possibly follicles or colour may be an artifact of storage) accounting for 94 ± 49. Salamanders were collected in September after the expected egg-laying period for the terrestrial form (early spring); thus, the reproductive stage of the eggs is unclear, but is assumed to be post-breeding and representative of developing eggs and follicles. Canadian data on in ovo counts within the body cavity have not been reported for Blotched Tiger Salamander paedogens and our study provides valuable information on the reproductive condition of paedogens. Although terrestrial forms have been observed, the presence of paedogens in the treated wetland has yet to be detected.","PeriodicalId":56136,"journal":{"name":"The Canadian Field-Naturalist","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74197345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Status and declining trend of Sparrow’s-egg Lady’s-slipper (Cypripedium passerinum) orchids in Pukaskwa National Park, Ontario, Canada 加拿大安大略省Pukaskwa国家公园雀蛋蛱蝶兰花的现状及下降趋势

The Canadian Field-Naturalist Pub Date : 2022-04-28 DOI: 10.22621/cfn.v135i4.2723

Courtney Irvine, L. Patterson

引用次数: 0

Another mention of Meadow Vole (Microtus pennsylvanicus) found in pellets of Snowy Owl (Bubo scandiacus) in northern Ungava Peninsula, Canada 在加拿大昂加瓦半岛北部的雪鸮(Bubo scandiacus)的颗粒中发现了另一个提到的草地田鼠(Microtus pennsylvanicus)

The Canadian Field-Naturalist Pub Date : 2022-04-28 DOI: 10.22621/cfn.v135i4.2719

L. Arbez, A. Royer, J. Therrien, S. Montuire

引用次数: 0

Assessing migration strategies and cause specific mortality of adult female White-tailed Deer (Odocoileus virginianus) in North Dakota, USA 美国北达科他州成年雌性白尾鹿(Odocoileus virginianus)迁徙策略及特定死亡原因评估

The Canadian Field-Naturalist Pub Date : 2022-04-28 DOI: 10.22621/cfn.v135i4.2104

Brian A. Schaffer, J. Jenks, W. Jensen, Eric S. Michel

{"title":"Assessing migration strategies and cause specific mortality of adult female White-tailed Deer (Odocoileus virginianus) in North Dakota, USA","authors":"Brian A. Schaffer, J. Jenks, W. Jensen, Eric S. Michel","doi":"10.22621/cfn.v135i4.2104","DOIUrl":"https://doi.org/10.22621/cfn.v135i4.2104","url":null,"abstract":"Life-history characteristics of White-tailed Deer (Odocoileus virginianus) have been documented in areas of the Northern Great Plains, but limited information is available in grassland dominated regions. We documented migration strategy, home range use, and survival of adult female White-tailed Deer in central North Dakota. We monitored 62 radio-collared adult (>1.5 year-old) female White-tailed Deer from February 2010 to December 2012. We documented 86 summer home ranges and classified deer as resident, migratory, or exhibiting a late season movement. Mean migration distance between non-overlapping summer and winter home ranges was 11.76 km (SE 0.86, n = 21). Mean late season movements were 20.69 km (SE 2.94, n = 7) and were likely the result of deer exhausting food resources throughout winter. We also developed five competing models that represented variation in survival among time periods (e.g., pre-hunt, hunt, and post-hunt in 2010 and 2011). Our top model indicated that survival (S) was similar between hunt 2010 and post-hunt 2011 periods but was lower (S = 0.82; SE 0.04, 95% CI 0.73–0.89) than the remaining time periods (S = 0.97; SE 0.01, 95% CI 0.93–0.99). Our results suggest that deer migration strategies and survival are likely influenced by a combination of winter severity and food availability. Mortalities attributed to hunter harvest were low during our study, which may indicate that increased recreational opportunities could be made available, even after severe winters.","PeriodicalId":56136,"journal":{"name":"The Canadian Field-Naturalist","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82625114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Gimme shelter: anthropogenic structures as resting sites for American Marten (Martes americana) 给我庇护:作为美洲貂休息场所的人为结构

The Canadian Field-Naturalist Pub Date : 2022-04-28 DOI: 10.22621/cfn.v135i4.2725

T. Jung, B. Slough

引用次数: 0

Diet and reproductive success of Great Horned Owl (Bubo virginianus) at its northern breeding limit 大角鸮(Bubo virginianus)北部繁殖极限的饮食和繁殖成功

The Canadian Field-Naturalist Pub Date : 2022-04-28 DOI: 10.22621/cfn.v135i4.2445

Madison Reynolds, J. Shook, G. Breed, K. Kielland

{"title":"Diet and reproductive success of Great Horned Owl (Bubo virginianus) at its northern breeding limit","authors":"Madison Reynolds, J. Shook, G. Breed, K. Kielland","doi":"10.22621/cfn.v135i4.2445","DOIUrl":"https://doi.org/10.22621/cfn.v135i4.2445","url":null,"abstract":"We studied the diet and reproductive success of Great Horned Owl (Bubo virginianus) at its northern range limit during an apparent high in the Snowshoe Hare (Lepus americanus) population. We performed diet analyses using images from fixed motion sensor cameras and pellet and prey remains collected at active nests, and gathered data on breeding success through camera and visual observations. Pellet data at 14 nests produced 1277 prey records consisting of 65–95% Snowshoe Hare biomass. Great Horned Owls ate 18 different prey types, with overall biomass consisting of 93% mammal, 7% bird, and less than 1% insects, frogs, and fish. The mean prey mass of 714 g (± 34 SE) was 2–25 times the mean prey mass of studies of this species at more southerly latitudes. Camera observations showed that Great Horned Owls delivered an average of 459 g/chick/d (± 75) throughout nesting. This was significantly (P = 0.005) higher than observations from Alberta, at 328–411 g/chick/d. Pellet/prey remains data showed that Great Horned Owls delivering a higher proportion of hares to their nestlings successfully raised more chicks (χ21 = 6.3, P = 0.012), highlighting the importance of this prey in the population dynamics of Great Horned Owl. In addition, we observed Snowshoe Hare removing pellets beneath nest sites, revealing an apparently undocumented bias to the use of pellet analysis.","PeriodicalId":56136,"journal":{"name":"The Canadian Field-Naturalist","volume":"60 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86052697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

New Titles 新书

The Canadian Field-Naturalist Pub Date : 2022-04-28 DOI: 10.22621/cfn.v135i4.2981

W. Halliday

引用次数: 0

"We Are All Whalers: the Plight of Whales and our Responsibility" by Michael J. Moore, 2021 [book review] 《我们都是捕鲸者:鲸鱼的困境和我们的责任》，作者:迈克尔·j·摩尔，2021年出版[书评]

The Canadian Field-Naturalist Pub Date : 2022-04-28 DOI: 10.22621/cfn.v135i4.2975

W. Halliday

引用次数: 0

Continuing expansion of Narrow-leaved Cattail (Typha angustifolia) and decline of a provincially rare fen in the Holland Marsh, Ontario 窄叶香蒲(Typha angustifolia)的持续扩张和安大略省荷兰沼泽的省级稀有沼泽的减少

The Canadian Field-Naturalist Pub Date : 2022-04-28 DOI: 10.22621/cfn.v135i4.2793

B. Thompson

{"title":"Continuing expansion of Narrow-leaved Cattail (Typha angustifolia) and decline of a provincially rare fen in the Holland Marsh, Ontario","authors":"B. Thompson","doi":"10.22621/cfn.v135i4.2793","DOIUrl":"https://doi.org/10.22621/cfn.v135i4.2793","url":null,"abstract":"At the time of European settlement, an extensive graminoid wetland existed at the confluence of the East and West Holland Rivers at the southern end of Lake Simcoe, Ontario. However, by 1925, clearing and draining of the marsh for specialty agriculture (i.e., market gardens) had begun and, by the 1940s, ~46% of the wetland had been cleared and another 13% was lost before 2016. Concurrent with marsh conversion has been an increase in Narrow-leaved Cattail (Typha angustifolia) in the remnant wetland. This study documents the change in the Holland Marsh wetland by delineating boundaries between marsh, fen, and shrub communities on aerial photographs taken at ~10-year intervals between 1946 and 2015 and documenting vegetation change along transects running perpendicular to tributaries bisecting the wetland. The extent of fen habitat within the Holland Marsh has been decreasing since 1946 at an average rate of 0.24 ha/year because of increases in both shrub and marsh (i.e., T. angustifolia) communities. Typha angustifolia expansion has been predominantly from along the margins of the Holland River where soil phosphorus concentration is significantly higher than in the core of the fen. Beyond 30 m from the river, vegetation dominance shifts from T. angustifolia to sedges (Cyperaceae). Managing phosphorus loading from upstream land uses will be of critical importance in protecting this habitat, which is rare in southern Ontario.","PeriodicalId":56136,"journal":{"name":"The Canadian Field-Naturalist","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86581777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Apparent winterkill of Painted Turtle (Chrysemys picta) 彩龟的明显冬杀性

The Canadian Field-Naturalist Pub Date : 2022-04-28 DOI: 10.22621/cfn.v135i4.2709

David C. Seburn, M. Burns, Iyanuoluwa Akinrinola, Sara Cecile, T. Farquharson, Charlotte Hung, Payton McIntyre

{"title":"Apparent winterkill of Painted Turtle (Chrysemys picta)","authors":"David C. Seburn, M. Burns, Iyanuoluwa Akinrinola, Sara Cecile, T. Farquharson, Charlotte Hung, Payton McIntyre","doi":"10.22621/cfn.v135i4.2709","DOIUrl":"https://doi.org/10.22621/cfn.v135i4.2709","url":null,"abstract":"Around the margin of an artificial pond in Ottawa, Ontario, we found 25 Painted Turtles (Chrysemys picta) that appeared to have died over the course of two winters (17 during the first winter and eight during the second). We examined meteorological data to try to determine the cause of the mortality. Summer and fall rains were only slightly below normal in both years, suggesting water levels should have been close to normal. The winter air temperature was warmer than normal and winter snowfall was slightly above normal in both years. Unseasonable weather does not appear to be responsible for the winter mortality and the pond’s maximum depth of 1.7 m should prevent freezing to the bottom. It is possible that the artificial nature of the pond creates suboptimal overwintering habitat, rendering the site an ecological trap; however, there is no direct evidence to support this theory. It is also possible that winter mortality of turtles is widespread at temperate wetlands, but that dead turtles were more detectable at this site because of the bare shoreline around the pond. Winter mass mortality events, if common, may represent an additional threat to turtle populations, which are declining from various anthropogenic threats.","PeriodicalId":56136,"journal":{"name":"The Canadian Field-Naturalist","volume":"80 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80441574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0