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Table 2 Perception of the fishers in the region of Coroa do Avião Island with regard to the local population of migratory shorebirds

From: Do artisanal fishers perceive declining migratory shorebird populations?

Question Answer Gender Age (%) Colony Test
M% F% 40 % 40 + % IT% IP% IG%
Do you know what shorebirds are? no 40.9 54.0 31.1 59.5 38.5 43.7 50.8 Gender: (χ 2 = 3.919; n = 232; d.f. = 1; p = 0.0477)
Age: (χ 2 = 18.651; n = 232; d.f. = 1; p = 0.0001)
Colony: (χ 2 = 2.157; n = 232; d.f. = 2; p = 0.34)
yes 59.1 46.0 68.9 40.5 61.5 56.3 49.2
Do you know the areas where shorebirds can be found? no 21.6 46.7 37.3 29.1 54.1 20.0 32.2 Gender: (χ 2 = 15.326; n = 217; d.f. = 1; p = 0.0001)
Age: (χ 2 = 1.594; n = 217; d.f. = 1; p = 0.2067)
Colony: (χ 2 = 12.514; n = 217; d.f. = 2; p = 0.0019)
yes 78.4 53.3 62.7 70.9 45.9 80.0 67.8
Are these birds faithful to these sites? SS 50.5 61.5 45.5 58.7 54.5 45.5 59.8 Gender: (χ 2 = 1.931; n = 159; d.f. = 2; p = 0,3807)
Age: (χ 2 = 2.971; n = 159; d.f. = 2; p = 0.2264)
Colony: (G = 9.3748; n = 159; d.f. = 4; p = 0.0524)
DS 12.1 11.5 16.4 9.6 27.3 9.1 9.8
NS 37.4 26.9 38.2 31.7 18.2 45.5 30.5
What causes this behavior? LC 21.0 8.9 4.8 22.3 12.5 25.9 11.6 Gender: (G = 4.1926; n = 145; d.f. = 2; p = 0.1229)
Age: (G = 14.583; n = 145; d.f. = 2; p = 0.0007)
Colony: (G = 7.1067; n = 147; d.f. = 4; p = 0.1304)
HT 76.0 84.4 83.3 76.7 83.3 72.2 79.7
ED 3.0 6.7 11.9 1.0 4.2 1.9 8.7
Have their flocks decreased in size? No 46.8 43.2 40.0 42.9 43.3 39.1 41.2 Gender: (χ = 1.724; n = 194; d.f. = 1; p = 0.1892)
Age: (χ 2 = 0.199; n = 194; d.f. = 1; p = 0.6558)
Colony: (χ 2 = 0.322; n = 194; d.f. = 2; p = 0.8512)
Yes 53.2 56.8 60.0 57.1 56.7 60.9 58.8
Do you perceive any changes in the island? No 21.4 37.7 29 27.5 21.2 22.6 33 Gender: (χ 2 = 5.959;n = 189;d.f. = 1;p = 0,0146)
Age: (χ 2 = 0.048; n = 189; d.f. = 1; p = 0.8267)
Colony: (χ 2 = 3.357; n = 189; d.f. = 2; p = 0.1867)
Yes 78.6 62.3 71 72.5 78.8 77.4 66
What changes are these? HB 58.7 57.4 53.3 61.0 50.0 56.1 61.9 Gender: (χ 2 = 0.218; n = 252; d.f. = 2; p = 0.8969)
Age: (χ 2 = 0.839; n = 252; d.f. = 2; p = 0.6574)
Colony: (G = 5.7475; n = 122; d.f. = 4; p = 0.2188)
CE 25.3 23.4 28.9 22.1 44.4 24.4 19.0
DE 16.0 19.1 17.8 16.9 5.6 19.5 19.0
What changes have provoked a reduction in shorebird populations? 1 19.2 11.6 13.0 18.5 12.5 20.9 15.0 Gender: (χ 2 = 4.807; n = 199; d.f. = 5; p = 0.4399)
Age: (χ 2 = 5.474; n = 199; d.f. = 5; p = 0.3608)
Colony: (H = 10.7232; n = 199; d.f. = 2; p = 0.0047)
2 13.1 10.1 15.9 10.0 3.1 11.9 15.0
3 18.5 15.9 13.0 20.0 12.5 20.9 17.0
4 23.8 36.2 34.8 24.6 43.8 22.4 27.0
5 10.8 13.0 11.6 11.5 3.1 10.4 15.0
6 14.6 13.0 11.6 15.4 25.0 13.4 11.0
Which practices interfere with the presence of the birds? 7 13.8 13.2 16.8 11.8 14.6 12.8 13.8 Gender: (χ 2 = 3.958; n = 279; d.f. = 4; p = 0.4117)
Age: (χ 2 = 2.571; n = 279; d.f. = 4; p = 0.632)
Colony: (H = 9.5461; n = 279; d.f. = 2; p = 0.0085)
8 24.5 25.3 25.7 24.2 16.7 29.1 24.8
9 23.4 17.6 22.8 20.8 18.8 24.4 20.7
10 14.4 23.1 14.9 18.5 27.1 10.5 17.9
11 23.9 20.9 19.8 24.7 22.9 23.3 22.8
  1. M%: Percentage of male informants; F%: Percentage of female informants; −40 %: Percentage of informants less than 40 years of age; 40 + %: Percentage of informants older than 40 years of age; IT%: Percentage of the fishers from Itamaracá; IP%: Percentage of fishers from Itapissuma; IG%: Percentage of fishers from Igarassu
  2. Abbreviations: SS same sites, DS same sites and different sites, NS new sites, LC life cycle of the birds, HT habitat/environment, ED environmental degradation, HB housing boom, CE conservation of the environment, DE degradation of the environment
  3. 1: Hotel Amoaras/Gavôa; 2: Airfield; 3: Shrimp farms; 4: Housing boom; 5: Construction of factories; 6: Other; 7: Ultralight planes, helicopters and airplanes flying overhead; 8: Boat traffic around the island; 9: Movements of tourists on the island; 10: Accumulation of garbage on the island; 11: Sound pollution from bars and boats