Spyvalve chronicles daily: Update for Mediterranean Mussels at ManMarina on 2025-04-23

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 2025-04-23. 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 18.7 to 24.1 degrees C. Total rainfall was 1.4 mm. Humidity ranged from 60 to 90% (Fig.1). Maximum wind speed was 28 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 ~100 % of possible records for this station.

There were 5 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 27 to 97 %. The number of closures for the day ranged from 10 to 51 and the number of micro-closures from 28 to 175. 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	492	505	13	91	10	30
A001	Active	503	530	27	96	34	36
A002	Down	487	494	7	NA	NA	NA
A003	Active	493	509	16	96	32	175
A004	Active	500	519	19	27	51	55
A005	Down	493	502	9	NA	NA	NA
A006	Active	507	530	23	97	15	28
A007	Down	470	478	8	NA	NA	NA

Mean of shell gaping activity

Figure 4. Average of mussel gape activity recorded for 5 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 5 relaible agents and water temperature at ManMarina.

Appendix

Appendix 1. Raw valve gape activity for ManMarina.