Harry Butler Institute, Murdoch University, Perth, Western Australia

\(\\\) To cite this article: Cottingham A, Beatty S, Tweedley J. (2024). Spyvalve chronicles daily: Update for Mediterranean Mussels at ManMarina on 2025-03-24. Spyvalve Repositories, Vol. 1.

Spyvavle chronicles daily for ManMarina provides updates on weather and bivalve (Agents) activity for the previous 24h period (from midnight). The report provides information on data aquisition, number of active agents (individuals providing sufficient data), and valve gaping activities, incuding average activity, amount of time valves remained closed, number of full and micro-closures and synchronised closing events.

\(\\\) Monitoring station location.

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Weather conditions

The following weather report is autogenerated based on data obtained from the Bureau of Meteorology for Mandurah. The contents of this report have not undergone rigorous assessment and thus care must be taken when drawing conclusions.

Air temperatures recorded at Mandurah ranged from 21 to 31.4 degrees C. Total rainfall was 0 mm. Humidity ranged from 35 to 75% (Fig.1). Maximum wind speed was 19 km/h (Fig.2).

Figure 1. Weather conditions recorded for Mandurah.

Figure 2. Wind conditions (direction and speed) recorded at Mandurah.

Data records for last day

WARNING. This report is autogenerated daily for data collected at ManMarina. The contents of this report have not undergone rigorous assessment. Care must be taken when drawing conclusions from the following analyses.

Figure 1. Approximate frequency of data records received by the network. This represents ~99 % of possible records for this station.

There were 7 active agents sending data (Table 1). These are based on the difference between the minimum and maximum mV values for each Agent, with a minimum difference of 10 mV being sufficient to deem those data relaible. Unreliable Agents are removed from analyses. Over the day percentage open ranged from 0 to 91 %. The number of closures for the day ranged from 1 to 113 and the number of micro-closures from 0 to 146. The maximum time all mussels closed at once was 1 minutes.

Active Min (mV) Max(mV) Diff(mV) % open n closures n micro-closures
A000 Active 494 506 12 83 24 83
A001 Active 503 537 34 47 46 55
A002 Down 490 495 5 NA NA NA
A003 Active 499 513 14 82 113 133
A004 Active 505 523 18 53 54 54
A005 Active 495 505 10 81 97 146
A006 Active 510 538 28 91 11 6
A007 Active 33 507 474 0 1 0

Mean of shell gaping activity

Figure 4. Average of mussel gape activity recorded for 7 relaible agents. Data were transformed, with values of 1.0 corresponding to shells being open to their greatest extent and values <0.2 (red-dashed line) considered as shell being closed

Shell closures by the hour

Figure 5. Number of closures and total time each agent spent closed.

Figure 6. Transformed mussel gape activity for the 7 relaible agents and water temperature at ManMarina.

Appendix

Appendix 1. Raw valve gape activity for ManMarina.