Spyvalve chronicles daily: Update for Mediterranean Mussels at Murray_River_1 on 2025-09-18

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_1 on 2025-09-17. Spyvalve Repositories, Vol. 1.

Spyvavle chronicles daily for Murray_River_1 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.

\(\\\)

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 13 to 19.1 degrees C. Total rainfall was 3.2 mm. Humidity ranged from 50 to 86% (Fig.1). Maximum wind speed was 20 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_1. 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 10 to 71 %. The number of closures for the day ranged from 0 to 11 and the number of micro-closures from 0 to 29. The maximum time all mussels closed at once was 6 minutes and this occurred at 05:09.

	Active	Min (mV)	Max(mV)	Diff(mV)	% open	n closures	n micro-closures
A000	Active	346	423	77	28	2	10
A001	Down	458	467	9	NA	NA	NA
A002	Down	407	415	8	NA	NA	NA
A003	Down	356	363	7	NA	NA	NA
A004	Active	437	473	36	10	11	17
A005	Active	311	327	16	71	0	0
A006	Down	431	437	6	NA	NA	NA
A007	Active	486	514	28	68	8	29

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_1.

Appendix

Appendix 1. Raw valve gape activity for Murray_River_1.