Spyvalve chronicles daily: Update for Mediterranean Mussels at Murray_River_2 on 2025-09-13

Harry Butler Institute, Murdoch University, Perth, Western Australia

\(\\\) To cite this article: Cottingham A, Beatty S, Tweedley J. (2025). Spyvalve chronicles daily: Update for Mediterranean Mussels at Murray_River_2 on 2025-09-12. Spyvalve Repositories, Vol. 1.

Spyvavle chronicles daily for Murray_River_2 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 16.9 to 20.8 degrees C. Total rainfall was 2.8 mm. Humidity ranged from 44 to 92% (Fig.1). Maximum wind speed was 32 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 Murray_River_2. 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 4 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 58 to 97 %. The number of closures for the day ranged from 17 to 27 and the number of micro-closures from 26 to 35. 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	Down	349	358	9	NA	NA	NA
A001	Down	371	372	1	NA	NA	NA
A002	Active	388	409	21	58	19	26
A003	Down	374	376	2	NA	NA	NA
A004	Active	266	310	44	97	17	35
A005	Down	346	354	8	NA	NA	NA
A006	Active	263	332	69	84	27	34
A007	Active	254	311	57	74	19	35

Mean of shell gaping activity

Figure 4. Average of mussel gape activity recorded for 4 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 4 relaible agents and water temperature at Murray_River_2.

Appendix

Appendix 1. Raw valve gape activity for Murray_River_2.