Table 1 Summary of A. senhousia population data from sites within the Solent region of the UK, recorded from 2007–2019. Site numbers correlate with Fig. 1. Gonad stages based on those of Sgro et al.19: “1–2” = spent or developing; “3–4” = ripe or spawning; “–” = data not collected.
Habitat | Location | Site | Year | Count | Density (m−2): range, mean, + /− SD | Shell length (mm): range, mean, + /− SD | Gonad stage | Surveying organisation |
|---|---|---|---|---|---|---|---|---|
Subtidal | Southampton Water | 1–45 | 2007 | 0 | – | – | – | Environment Agency |
46–70 | 2011 | 18 | 0–70, 7.2 + /− 18.6 | – | – | |||
71–95 | 2013 | 10 | 0–70, 4 + /− 14.1 | – | – | |||
96–120 | 2016 | 51 | 0–290, 20.4 + /− 58.8 | – | – | |||
Intertidal | Hythe, River Test | 121 | 2016 | 1 | – | 17 | – | Pisces Conservation Ltd |
2019 | 1 | – | 18 | – | ||||
Intertidal | Brownwich | 122 | 2017 | 5 | – | 14.1–20.8, 17.9 + /− 2.5 | – | University of Portsmouth |
2019 | 169 | 0.06 | 9–32, 20.1 + /− 3.9 | March–May: 1–2; July: 3–4; Sept/Oct: 1–4 (in 2019) | ||||
Intertidal | Weston Shore, River Itchen | 123 | 2018 | 2 | – | – | – | University of Southampton |
Marina; suspended hard surfaces | Saxon Wharf, River Itchen | 124 | 2018 | 3 | 0.67 | 7–13, 8.7 + /− 3.1 | – | University of Portsmouth |
14 | – | 13–23, 17.6 + /− 3.0 | – | |||||
Marina; suspended hard surfaces | Port Hamble, River Hamble | 125 | 2019 | – | – | – | – | University of Portsmouth |
Intertidal | Lepe | 126 | 2019 | 1 | – | – | – | Hampshire and Isle of Wight Wildlife Trust volunteer |
Intertidal; Zostera marina, Z. noltei beds | Portsmouth Harbour | 127 | 2019 | 1 | 4 | 18 | – | University of Portsmouth |
Intertidal; highly sheltered | Chichester Harbour | 128 | 2019 | 1 | – | 4 | – | University of Portsmouth |
Marina; suspended hard surfaces | Shamrock Quay, River Itchen | 129 | 2019 | 2 | – | 19, 28 | – | University of Portsmouth |
Subtidal | Newtown, Isle of Wight | 130 | 2019 | 1 | – | 21 | – | University of Portsmouth |
