California Fish and Wildlife Journal最新文献_第6页

Comparing camera traps and visual encounter surveys for monitoring small animals 比较相机陷阱和视觉相遇调查监测小动物

IF 0.5 4区生物学

California Fish and Wildlife Journal Pub Date : 2021-08-09 DOI: 10.51492/cfwj.107.9

Madison K. Boynton, Matthew Toenies, Nicole Cornelius, L. Rich

{"title":"Comparing camera traps and visual encounter surveys for monitoring small animals","authors":"Madison K. Boynton, Matthew Toenies, Nicole Cornelius, L. Rich","doi":"10.51492/cfwj.107.9","DOIUrl":"https://doi.org/10.51492/cfwj.107.9","url":null,"abstract":"Amphibian and reptile species face numerous threats including disease, habitat loss and degradation, invasive species, and global climate change. However, effective management and conservation of herpetofauna largely depends upon resource-intensive survey methodologies. Recent research has shown promise in the use of camera trapping techniques, but these methods must be tested alongside traditional methods to fully understand their advantages and disadvantages. To meet this research need, we tested two herpetofauna survey methods: a modified version of the Adapted-Hunt Drift Fence Technique, which combines a drift fence with camera traps; and a traditional method of visual encounter surveys (VES) with cover boards. Between June and August 2020, we conducted two VES and installed one drift fence with camera traps at ten sites in Monterey County, CA, USA. The drift fence/camera setup outperformed the VES in terms of number of observations and herpetofauna species detected. Drift fences with cameras produced a mean of 248 images of three to six species per site, while VES and cover objects produced a mean of 0.6 observations of zero to one species per site. Across all sites, we detected seven reptile and one amphibian species with the drift fence/camera setup, while VES resulted in identifications of two reptile and one amphibian species. In addition, drift fence/camera setups recorded a minimum of nine nonherpetofauna species including small mammals, birds, and invertebrates. Our research supports that drift fences combined with camera traps offer an effective alternative to VES for large-scale, multi-species herpetofauna survey efforts. Furthermore, we suggest specific improvements to enhance this method’s performance, cost-effectiveness, and utility in remote environments. These advances in survey methods hold great promise for aiding efforts to manage and conserve global herpetofauna diversity.","PeriodicalId":29697,"journal":{"name":"California Fish and Wildlife Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43910355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The distribution of anadromy and residency in steelhead/rainbow trout in the Eel River, northwestern California 加州西北部鳗鱼河中虹鳟和钢头鳟鱼雌雄同体的分布和居住习性

IF 0.5 4区生物学

California Fish and Wildlife Journal Pub Date : 2021-08-09 DOI: 10.51492/cfwj.107.7

B. Harvey, R. J. Nakamoto, A. Kent, C. Zimmerman

{"title":"The distribution of anadromy and residency in steelhead/rainbow trout in the Eel River, northwestern California","authors":"B. Harvey, R. J. Nakamoto, A. Kent, C. Zimmerman","doi":"10.51492/cfwj.107.7","DOIUrl":"https://doi.org/10.51492/cfwj.107.7","url":null,"abstract":"To inform management and conservation of the species, we investigated the distribution of anadromy and residency of steelhead/rainbow trout (Oncorhynchus mykiss) in the Eel River of northwestern California. We determined maternal anadromy versus residency for 106 juvenile O. mykiss using otolith microchemistry. To attempt to relate patterns of anadromy with environmental factors known to influence its distribution in O. mykiss in other places, fish were collected from 52 sites throughout the drainage covering a range of stream size (0.1–7.7 m3/s estimated mean annual run-off) and distance from the ocean (23–219 km). Sixty-one of 91 fish sampled below prospective barriers had anadromous mothers, while 1 of 15 fish sampled above barriers had an anadromous mother. We did not detect any influence of stream size or distance from the ocean on the occurrence of anadromy. Fish with resident mothers were found at 21 of 46 sites below barriers. The current broad distribution of fish with resident mothers indicates the importance of maintaining freshwater conditions suitable for resident adults and juveniles age-1 and older, such as preserving dry-season streamflows.","PeriodicalId":29697,"journal":{"name":"California Fish and Wildlife Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41698908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Protecting a displaced species in an altered river: a case study of the endangered Sacramento River winter-run Chinook Salmon 在改变的河流中保护一个流离失所的物种:濒危的萨克拉门托河冬季迁徙奇努克鲑鱼的案例研究

IF 0.5 4区生物学

California Fish and Wildlife Journal Pub Date : 2021-07-06 DOI: 10.51492/CFWJ.CESASI.8

Erica M. Meyers

引用次数: 1

Home range and movements of San Joaquin antelope squirrels in the San Joaquin Desert of California 圣华金羚羊和松鼠在加州圣华金沙漠的活动范围

IF 0.5 4区生物学

California Fish and Wildlife Journal Pub Date : 2021-07-06 DOI: 10.51492/CFWJ.CESASI.19

D. Germano, G. Rathbun, L. Saslaw, B. Cypher

引用次数: 3

Observations on the phenology of the threatened Alameda whipsnake 濒危阿拉米达鞭蛇物候学观察

IF 0.5 4区生物学

California Fish and Wildlife Journal Pub Date : 2021-07-06 DOI: 10.51492/CFWJ.CESASI.15

J. Alvarez, Derek S. Jansen, Cyndy Shaffer, Joseph Didonato

引用次数: 0

The explicit integration of Species Conceptual Models and Species Distribution Models as a best practice for systematic conservation planning in California 物种概念模型和物种分布模型的明确整合作为加州系统保护规划的最佳实践

IF 0.5 4区生物学

California Fish and Wildlife Journal Pub Date : 2021-07-06 DOI: 10.51492/CFWJ.CESASI.2

Monica D. Parisi, S. Greco

引用次数: 1

A conservation conundrum: protecting bumble bees under the California Endangered Species Act 一个保护难题:根据加州濒危物种法案保护大黄蜂

IF 0.5 4区生物学

California Fish and Wildlife Journal Pub Date : 2021-07-06 DOI: 10.51492/CFWJ.CESASI.5

Rich Hatfield, Sarina J. Jepsen

引用次数: 1

Status of the Amargosa niterwort (Amaranthaceae) in California and Nevada 标题加利福尼亚和内华达苋菜科植物的现状

IF 0.5 4区生物学

California Fish and Wildlife Journal Pub Date : 2021-07-06 DOI: 10.51492/CFWJ.CESASI.4

N. Fraga, A. L. Miller, S. D. De Groot, Corey Lee, Christina L. Lund, K. Moore-O’Leary

{"title":"Status of the Amargosa niterwort (Amaranthaceae) in California and Nevada","authors":"N. Fraga, A. L. Miller, S. D. De Groot, Corey Lee, Christina L. Lund, K. Moore-O’Leary","doi":"10.51492/CFWJ.CESASI.4","DOIUrl":"https://doi.org/10.51492/CFWJ.CESASI.4","url":null,"abstract":"The Amargosa niterwort is a narrow endemic restricted to alkali wetlands of the northern Mojave Desert in Inyo County, California and Nye County, Nevada. Groundwater pumping and subsequent hydrological alteration within the Amargosa groundwater basin has been identified as the most significant threat to the long-term persistence of the species. Parallel monitoring programs were established in California (2010) and Nevada (2014) to establish baseline trends in abundance, measured as ramet (stem) number, and to aid in determining management actions that are needed to ensure the long-term viability of populations. Monitoring in California shows significant variation in abundance between years; however, there are consistent trends, indicating that factors influencing increase or decrease in abundance is similar across the population. However, this pattern is not shared in Nevada, where following a sharp decline between 2014 and 2015 the population has remained relatively stable. Two of the three Nevada macroplots are downstream from Crystal Reservoir and are likely influenced by discharge from the reservoir including periodic water releases and leakage from the earthen dam. Significant increases and decreases in abundance within macroplots are not correlated with climate variables including precipitation, thus it is important to understand how groundwater flow and spring discharge impacts abundance of plants within and between populations.","PeriodicalId":29697,"journal":{"name":"California Fish and Wildlife Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44155511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Development of a morphological key for the southern salt marsh harvest mouse using genetically verified individuals 利用基因验证的个体开发南部盐沼收获鼠的形态学关键

IF 0.5 4区生物学

California Fish and Wildlife Journal Pub Date : 2021-07-06 DOI: 10.51492/CFWJ.CESASI.22

M. Statham, L. Barthman-Thompson, S. Fresquez, B. Sacks

{"title":"Development of a morphological key for the southern salt marsh harvest mouse using genetically verified individuals","authors":"M. Statham, L. Barthman-Thompson, S. Fresquez, B. Sacks","doi":"10.51492/CFWJ.CESASI.22","DOIUrl":"https://doi.org/10.51492/CFWJ.CESASI.22","url":null,"abstract":"The salt marsh harvest mouse (SMHM; Reithrodontomys raviventris) is a state and federally listed endangered species endemic to the coastal marshes of the San Francisco Estuary of California. Of two subspecies, the southern (R. r. raviventris) is most endangered and lacks reliable morphological field tools to distinguish from the sympatric western harvest mouse (WHM; R. megalotis). We trapped and collected genetic samples and morphological data from 204 harvest mice from 14 locations from across the range of the southern SMHM. Genetic species identification indicated these to be composed of 48 SMHM and 156 WHM, which we compared at ten morphological characters. Most continuous characters overlapped between species. Color characters were significantly differentiated and we identified a number of species-specific diagnostic pelage categories in both species. A random forest analysis indicated that ventral coloration of the abdomen and the ventral tail hair color were the most useful for differentiating between species. We used these two morphological characters to develop a decision tree which correctly classified 94% of harvest mice to species with 99% accuracy. These findings suggest that our decision tree can be used to reliably identify the species of most harvest mice in the range of the southern SMHM, with a small proportion (6% in our study) needing genetic confirmation. The decision tree should be tested on additional harvest mice that were not used in its development, particularly from novel locations across the range.","PeriodicalId":29697,"journal":{"name":"California Fish and Wildlife Journal","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43843009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

An overview of the listing process under the California Endangered Species Act 概述加州濒危物种法案下的上市程序

IF 0.5 4区生物学

California Fish and Wildlife Journal Pub Date : 2021-07-06 DOI: 10.51492/CFWJ.CESASI.1

P. Weiland, S. Clark, Ashley J. Remillard

引用次数: 0