Historical Harvest and Incidental Capture of Fishers in California
نویسندگان
چکیده
Recent petitions to list the fisher (Martes pennanti) under the Endangered Species Act have brought attention to fisher conservation. Although commercial trapping of fishers in California ended in 1946, summarizing the commercial harvest data can provide a historical perspective to fisher conservation and may indicate the prevalence of incidental fisher captures in traps set for other species. We investigated the relationships between historical fisher harvests and the price paid for fisher pelts, number of trapping licenses sold, cost of a trapping license, total number of 5 sympatric species harvested, and their pelt prices in California. The frequency of incidental captures was also assessed by interviewing trappers, biologists, and wardens in California. Between 1919-1946, relatively few fishers were legally trapped in California (n = 462, X = 18.5 annually), and their harvest declined steadily. Fisher harvests were positively related to fisher pelt price but were more strongly related to the number of trapping licenses sold, indicating that fishers were vulnerable to trappers in general as opposed to only those trappers specifically targeting them. We estimated an incidental capture rate of 1 per 407 set-nights and a mortality-injury rate of 24% from data obtained from 5 trappers in California. Trappers are an important source of information on the distribution of fishers and their cooperation is necessary to determine the effects of incidental capture on fisher populations.
منابع مشابه
Genetic Structure of a Recolonizing Population of Fishers (Martes pennanti)
We present the results of 769 fisher genotypes (Martes pennanti) studied across 35 landscapes in and around Ontario, Canada. Fishers were extirpated from much of southern Ontario prior to the 1950s. The recent recolonization of southern Ontario has been highly successful. We hypothesised that this recent expansion and recolonization originated from Algonquin Provincial Park, an area that has hi...
متن کاملEstimating Trends of Population Decline in Long-Lived Marine Species in the Mediterranean Sea Based on Fishers' Perceptions
We conducted interviews of a representative sample of 106 retired fishers in Italy, Spain and Greece, asking specific questions about the trends they perceived in dolphin and shark abundances between 1940 and 1999 (in three 20 year periods) compared to the present abundance. The large marine fauna studied were not target species of the commercial fleet segment interviewed (trawl fishery). The f...
متن کاملMonitoring Martes Populations in California: Survey Design and Power Analysis
Fishers (Martes pennanti) and American martens (M. americana) have been protected from trapping in California since the mid19OOs, yet in portions of each of their historic ranges their numbers are extremely low, perhaps due to the effects of timber harvest. We propose a method capable of detecting declines in the occurrence and distribution of fishers or martens using baited track-plate station...
متن کاملThe economic losses of small-scale fishers caused by Mediterranean monk seals, Monachus monachus (Hermann, 1779) in the Southern Aegean Sea: Muğla coasts
This study analyzed the interaction between the small-scale fishers and the Mediterranean Monk Seal (MMS) in an important Peninsula and two important marine protected areas on the southwest coast of Turkey. The survey was carried out from January 2014 to December in 2015 in the Muğla Province. Small-scale fishers in the study sites were interviewed to assess the interactions between small-scale...
متن کاملReview Papers:Species diversity and distribution pattern of marine mammals of the Persian Gulf and Gulf of Oman - Iranian Waters
A total of 98 marine mammal records from Iranian coastal waters of the Persian Gulf and Gulf of Oman were compiled of which 66 are previously unpublished new records. Seventy-nine were from the Persian Gulf and 16 from the Gulf of Oman coast. The largest numbers of records were from Qeshm Island and Bushehr Provinces. Records of finless porpoise (Neophocaena phocaenoides), Indo-pacific humpba...
متن کامل