Table 1.
Lochs on North Uist sampled in 1980 and 2010–12 with estimates of dissolved calcium concentration (mg/L), stickleback morph (see text for definitions), and rank predator abundance (1 = low abundance, 4 = high)
| 1980 | 2010–12 | |||||
|---|---|---|---|---|---|---|
| Site | OS grid reference | Dissolved calcium (mg/L) | Morph | Dissolved calcium (mg/L) | Morph | Rank trout abundance |
| Loch Fada | 875 705 | 2.25 | spine-deficient plateless | 3.06 | spine-deficient plateless | 4 |
| Loch á Bharpa1 | 837 664 | 1.90 | spine-deficient plateless | 1.42 | spine-deficient plateless | 1 |
| Loch nan Eun1 | 845 675 | 2.50 | spine-deficient plateless | 3.83 | spine-deficient plateless | 4 |
| Loch Huna1 | 813 665 | 1.65 | spine-deficient plateless | 1.87 | spine-deficient plateless | 4 |
| North Sgadabhagh | 868 685 | 1.40 | spine-deficient plateless | 1.00 | spine-deficient plateless | 3 |
| Loch na Maighdein1 | 893 683 | 0.94 | spine-deficient plateless | 1.49 | spine-deficient plateless | 2 |
| Loch na Moracha1 | 846 665 | 2.50 | spine-deficient plateless | 1.14 | spine-deficient plateless | 4 |
| Loch á Bhuird1 | 883 675 | 2.20 | spine-deficient plateless | 2.18 | spine-deficient plateless | 4 |
| Loch nan Geadh1 | 888 706 | 1.80 | spine-deficient plateless | 1.87 | spine-deficient plateless | 2 |
| Loch Tormasad | 820 650 | 2.50 | plateless | 2.90 | plateless | 3 |
| Loch Bhereagbhat | 882 723 | 0.94 | plateless | 1.80 | plateless | 2 |
| Loch Bruist | 775 683 | 1.80 | plateless | 2.82 | fish absent | – |
| Loch an Daimh1 | 889 678 | 3.55 | low | 3.24 | low | 1 |
| Loch nan Geireann1 | 845 725 | 1.80 | low | 1.87 | low | 2 |
| Loch Croghearraidh | 716 712 | 20.70 | low | 10.78 | low | 2 |
| Loch Sgaraigh1 | 717 705 | 16.90 | low | 13.49 | low | 2 |
| Loch Sanndaraigh1 | 735 685 | 23.50 | low | 11.19 | low | 2 |
| Loch Steineabhat | 875 743 | 2.80 | low | 3.95 | low | 3 |
| Loch na Morgha1 | 870 743 | 4.70 | low | 3.50 | low | 3 |
| Loch Hosta1 | 727 727 | 28.30 | low | 13.72 | low | 4 |
| Loch Dubhasairidh | 772 673 | 3.30 | low | 3.38 | low | 2 |
| Loch nan Athan1 | 778 668 | 9.40 | low | 4.06 | low | 3 |
| Loch á Charra | 779 689 | 4.50 | low | 3.31 | low | 2 |
| Loch nan Strùban | 808 647 | 4.00 | low | 3.27 | plateless | 4 |
| Loch an Toim | 794 658 | 3.30 | low | 1.63 | plateless | 4 |
| Loch na Creige | 883 737 | 3.70 | low | 3.55 | low | 2 |
| Bogach Maari1 | 860 719 | – | – | 1.01 | spine-deficient plateless | 1 |
| Loch Eubhal1 | 725 713 | – | – | 12.57 | low | 3 |
| South Sgadabhagh | 878 665 | – | – | 2.5 | spine-deficient plateless | 3 |
| Loch nan Cethir Eilean | 858 664 | – | – | 3.2 | spine-deficient plated | 2 |
| Loch Hungabhat | 873 724 | – | – | 2.92 | low | 3 |
| Wee Fada | 793 667 | – | – | 3.26 | plateless | 1 |
| Loch Deòireabhat | 892 662 | – | – | 2.35 | spine-deficient plateless | 3 |
| Loch Eisiadair | 807 728 | – | – | 4.21 | low | 2 |
Data for 1980 from Giles (1983), and 2010–12 the present study.
1
Populations used in boldness assay.