Table 4.
Prevalence (%, positive individuals/screened individuals) of Haplosporidia spp., Minchinia tapetis, M. mercenariae-like, Vibrio spp. and Vibrio aestuarianus screening in Cerastoderma edule at each sample site by season
| Sample site | Pathogen identification | Spring 2018 | Summer 2018 | Autumn 2018 | Winter 2018/19 | Spring 2019 | Totals |
|---|---|---|---|---|---|---|---|
| Cork Harbour – Ringaskiddy and Cuskinny | Haplosporidia spp. | 45.0% (27/60)a | 15.4% (6/39) | 41.7% (25/60) | 21.1% (8/38) | 28.3% (17/60) | 32.3% (83/257) |
| Minchinia tapetis | 15.0% (9/60) | 7.7% (3/39) | 18.3% (11/60)a | 2.6% (1/38) | 1.7% (1/60) | 9.7% (25/257) | |
| Minchinia mercenariae-like | 23.3% (14/60)a | 0% (0/39) | 8.3% (5/60) | 0% (0/38) | 10.0% (6/60) | 9.7% (25/257) | |
| Vibrio spp.b | 13.3% (8/60) | 12.8% (5/39) | 15.0% (9/60)a | 5.3% (2/38) | 11.7% (7/60) | 12.1% (31/257) | |
| V. aestuarianus | 1.7% (1/60)a | 0% (0/39) | 0% (0/60) | 0% (0/38) | 1.7% (1/60)a | 0.8% (2/257) | |
| Youghal Bay | Haplosporidia spp. | – | 9.1% (1/11) | 12.5% (2/16) | 56.7% (17/30)a | 8.33% (1/12) | 30.4% (21/69) |
| Minchinia tapetis | – | 0% (0/11) | 0% (0/16) | 0% (0/30) | 0% (0/12) | 0% (0/69) | |
| Minchinia mercenariae-like | – | 0% (0/11) | 12.5% (2/16)a | 3.3% (1/30) | 0% (0/12) | 4.3% (3/69) | |
| Vibrio spp.b | – | 27.3% (3/11) | 43.8% (7/16)a | 16.7% (5/30) | 33.3% (4/12) | 27.5% (19/69) | |
| V. aestuarianus | – | 27.3% (3/11)a | 6.3% (1/16) | 0% (0/30) | 0% (0/12) | 5.8% (4/69) | |
| Dungarvan Harbour | Haplosporidia spp. | – | 39.2% (20/51)a | 10.3% (6/58) | 30% (9/30) | 40% (12/30) | 27.8% (47/169) |
| Minchinia tapetis | – | 2.0% (1/51)a | 0% (0/58) | 0% (0/30) | 0% (0/30) | 0.6% (1/169) | |
| Minchinia mercenariae-like | – | 0% (0/51) | 0% (0/58) | 0% (0/30) | 10.0% (3/30)a | 1.8% (3/169) | |
| Vibrio spp.b | – | 56.9% (29/51)a | 56.9% (33/58)a | 6.7% (2/30) | 36.7% (11/30) | 44.4% (75/169) | |
| V. aestuarianus | – | 43.1% (22/51)a | 0% (0/58) | 0% (0/30) | 3.3% (1/30) | 13.6% (23/169) | |
| Dundalk Bay – Annagassan and Cooley | Haplosporidia spp. | – | 98.3% (59/60)a | 28.3% (17/60) | 45.0% (27/60) | 38.3% (23/60) | 52.5% (126/240) |
| Minchinia tapetis | – | 70.0% (42/60)a | 23.3% (14/60) | 0% (0/60) | 0% (0/60) | 23.3% (56/240) | |
| Minchinia mercenariae-like | – | 11.7% (7/60)a | 0% (0/60) | 1.7% (1/60) | 3.3% (2/60) | 4.2% (10/240) | |
| Vibrio spp.b | – | 38.3% (23/60)a | 33.3% (20/60) | 3.3% (2/60) | 26.7% (16/60) | 25.4% (61/240) | |
| V. aestuarianus | – | 3.3% (2/60) | 10% (6/60)a | 0% (0/60) | 0% (0/60) | 3.3% (8/240) | |
| Totals by season | Haplosporidia spp. | 45.0% (27/60) | 53.4% (86/161)a | 25.8% (50/194) | 38.6% (61/158) | 32.7% (53/162) | 37.7% (277/735) |
| Minchinia tapetis | 15.0% (9/60) | 28.6% (46/161)a | 12.9% (25/194) | 0.6% (1/158) | 0.6% (1/162) | 11.2% (82/735) | |
| Minchinia mercenariae-like | 23.3% (14/60)a | 4.3% (7/161) | 3.6% (7/194) | 1.3% (2/158) | 6.8% (11/162) | 5.6% (41/735) | |
| Vibrio spp.b | 13.3% (8/60) | 37.3% (60/161)a | 35.6% (69/194) | 7.0% (11/158) | 23.5% (38/162) | 25.3% (186/735) | |
| V. aestuarianus | 1.7% (1/60) | 16.8% (27/161)a | 3.6% (7/194) | 0.0% (0/158) | 1.2% (2/162) | 5.0% (37/735) |
(–) No samples.
a
The highest prevalence (%) for each pathogen group at each site/season is highlighted in bold.
b
Potential Vibrio species were defined in Table 5.