Habitat Assessment of the Pacific Sideband (Monadenia fidelis) In ...

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Pacific Sideband 8• “Coniferous forest - This area has a natural tree crown cover of 20% or more ofthe total polygon area, and at least 80% of the trees are conifers.• Broadleaf forest - This area has a natural tree crown cover of 20% or more of thetotal polygon area, and at least 65% of the trees are broadleaf.• Mixed forest - This area has a natural tree crown cover of 20% or more of thetotal polygon area, but of the total trees no more then 80% can be conifer and nomore then 65% can be broadleaf.• Shrubs - The area has less than 10% tree crown cover and natural shrubsconstitute 20% or more of the ground cover. Shrubs are defined as multi-stemmedwoody perennial plants, both evergreen and deciduous.• Herbs/grasses - The area has less than 20% tree cover, less than 20 % shrub cover,and 20% or more natural herbaceous cover. Herbs for this classification aredefined as grass-like vascular plants, including ferns and forbs, without a woodystem. Some dwarf woody plants may be included in this category.”Data was collected from plots centered on live snails or snail shells. The plots did nothave fixed areas; rather they were based on visual areas of homogenous forest type,disturbance, vegetation species, etc. As the habitat patch size of the species is not wellknown, it was thought that a fixed plot size may not accurately describe the actual habitatof the species. Therefore, the variable plots size was considered to be a more appropriateassessment of the habitat being used by the snail at the time of the survey.In each plot the number of live snails and shells were counted. This data was notconsidered to be accurate counts of the total number of snails in the plot. Counting wastypically undertaken by one crew member while the other entered data and fixed a GPSlocation. Counting stopped when the data was collected, regardless of how much of theplot was surveyed.3.0 ResultsField surveys were conducted from January 2006 to August 2007. In total, 159 plots weresurveyed in a variety of locations. The majority of the plots were located on McKee Peak,lower Sumas Mountain and Vedder Mountain within the City of Abbotsford. Additionalplots were located in the City of Abbotsford, Little Mountain (Chilliwack) and the lowerRyder Creek watershed in the Chilliwack River Valley. Due to the sensitivity of thespecies and the large number of plots that were located on private property, the specificlocations will not be made public. As the survey methodology was not standardized anddid not use fixed plots, statistical analysis of the results has been kept to a minimum.
Pacific Sideband 93.1 Number ObservedFrom the 159 plots a total of 154 live snails and 49 shells were observed. Counts of livesnails per plots ranged from 0 to 5 while shell counts per plot ranged from 0 to 3. Aspreviously mentioned, these counts are not considered to be an accurate representation ofthe number of individuals or shells per plot. Large numbers of live or dead snails werenot found within a given plot, but within larger areas or similar habitat types severaldozen or more were often observed. This result is consistent with our general fieldobservations working throughout the Fraser Valley. Furthermore, the majority ofobservations of multiple live snails occurred during known breeding times.3.2 VegetationData on the vascular vegetation present at each site were collected. Tree and shrubspecies were well inventoried, but herbaceous species were limited to commonoccurrences and do not represent the true diversity of species. Moss and lichens were notinventoried. Due to the length of the field survey, the following results were influencedby seasonal changes which affected the number and type of herbaceous species recorded.3.2.1 Forest CoverThe forest cover of 77 plots was estimated (Table 1). Broadleaf forest and mixed forestsaccounted for 61.0% and 25.9% of the plots while coniferous forests were only found in9.1% of the plots. A variety of other forest cover types comprised the remainder of theplots.Table 1. Forest CoverForest Cover # Plots PercentShrubs 2 2.6Mixed Forest 20 25.9Wetland 0 0.0Broadleaf Forest 47 61.0Exposed Soil 0 0.0Herbs/Grass 1 1.3Coniferous Forest 7 9.1TOTAL 773.2.2 Stand AgeThe estimated forest stand age was recorded for 77 plots. Young forests accounted for79.2% of the plots while mature forests accounted for 14.3%. Tall shrubs and saplingswere found in 3.9% and 2.6% respectively.This data is likely skewed towards younger stands as the majority of the plots werelocated within, or in close proximity too, urban areas where mature stands areuncommon.
Page 3 and 4: Pacific Sideband 3AcknowledgementsT
Page 5 and 6: Pacific Sideband 5List of TablesTAB
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Page 17: Pacific Sideband 17Figure 4 shows a

Habitat Assessment of the Pacific Sideband (Monadenia fidelis) In ...

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