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Table 4 Calculation of the change in Trichinella spp. biomass in raccoon dogs and red foxes in Estonia

From: Trichinella spp. biomass has increased in raccoon dogs (Nyctereutes procyonoides) and red foxes (Vulpes vulpes) in Estonia

 

Raccoon dog

Red fox

Reference

Hunting bag 1995, n animals

1723

3326

[67]

Hunting bag 2001, n animals

4259

6628

[67]

Hunting bag 2011, n animals

12,577

7144

[13]

With Trichinella larvae (%)

1992–2000

45.5

42.9

[14]

2000–2002

42.0

40.6

[4]

2011–2012

57.5

69.0

Present study

Mean body weight of host, g

4830

4890

[68, 69]

Muscle tissue of body weight, %

60

60

[70]

Median (mean) Trichinella lpg

1992–1996

nd (13.4)

nd (43.1)

[2]

2000–2002

7.2 (nd)

3.0 (nd)

[4]

2011–2012

98.0 (161.1)

8.2 (48.0)

Current study

Trichinella biomass 1992–2000, median (mean) n larvae

in 1000 animals

nd (17,669,106)

nd (54,249,367)

 

in the hunting baga

nd (30,443,870)

nd (180,433,393)

 

Trichinella biomass 2000–2002, median (mean) n larvae

in 1000 animals

8,763,552 (nd)

3,573,612 (nd)

 

in the hunting bagb

37,323,968 (nd)

23,685,900 (nd)

 

Trichinella biomass 2011–2012, median (mean) n larvae

in 1000 animals

163,302,300 (268,448,985)

16,600,572 (97,174,080)

 

in the hunting bagc

2,053,853,027 (3,376,282,884)

118,594,486 (694,211,628)

 

Increase in Trichinella biomass from 1992 to 2000 to 2011–2012, calculated from median (mean) n larvae

in 1000 animals

nd (15.2-fold)

nd (1.8-fold)

 

in the hunting bag

nd (110.9-fold)

nd (3.8-fold)

 

Increase in Trichinella biomass from 2000 to 2002 to 2011–2012, calculated from median (mean) n larvae

in 1000 animals

18.6-fold (nd)

4.6-fold (nd)

 

in the hunting bag

55.0-fold (nd)

5.0-fold (nd)

 
  1. Abbreviations: nd, no data; lpg, larvae per gram of muscle tissue
  2. a n larvae = n animals 1995 × % with larvae 1992–2000 × (mean body weight of host, g × muscle tissue of body weight, %) × median (mean) lpg (1992–1996)
  3. b n larvae = n animals 2001 × % with larvae 2000–2002 × (mean body weight of host, g × muscle tissue of body weight, %) × median (mean) lpg (2000–2002)
  4. c n larvae = n animals 2011 × % with larvae 2011–2012 × (mean body weight of host, g × muscle tissue of body weight, %) × median (mean) lpg (2011–2012)