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Recovery Strategy for the Basking Shark (Cetorhinus maximus) in Canadian Pacific Waters

Appendix C: Threat attributes Terminology

Table 6:   Details on Terms Used for Assessment of Threats to the Pacific Population of Basking Shark

AttributeLevel of EffectDescription
ExtentWidespreadAcross the species range.
Localized 
Unknown 
OccurrenceHistoricalContributed to decline but no longer affecting the species.
CurrentAffecting the species now.
ImminentIs expected to affect the species very soon.
AnticipatedMay affect the species in the future.
Unknown 
FrequencyOne-time 
SeasonalDue to migration or particular seasons.
ContinuousOngoing.
RecurrentReoccurs from time to time, but not on annual/seasonal basis.
Unknown 
SeverityHighVery large population-level effect.
Medium 
Low 
Unknown 
Causal CertaintyHighEvidence causally links the threat to stresses on population viability.
MediumCorrelation between the threat and population viability, expert opinion, etc.
LowAssumed or plausible threat only.
Level of ConcernHighOverall level of concern for recovery of the species, taking into account all of the above factors.
Medium 
Low 

Terms were obtained from Environment Canada’s “Guidelines for Identifying and Mitigating Threats to Species at Risk” (Environment Canada, 2008).

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