Spyvalve chronicles daily: Update for Mediterranean Mussels at ManMarina on 2025-03-11

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 2025-03-11. 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 19.1 to 31.1 degrees C. Total rainfall was 0 mm. Humidity ranged from 36 to 77% (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 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 8 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 40 to 90 %. The number of closures for the day ranged from 17 to 69 and the number of micro-closures from 11 to 105. 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	499	519	20	59	19	35
A001	Active	506	538	32	51	17	11
A002	Active	503	519	16	60	69	50
A003	Active	493	508	15	40	31	100
A004	Active	504	526	22	66	59	66
A005	Active	497	509	12	90	62	105
A006	Active	517	542	25	51	17	26
A007	Active	499	522	23	45	36	43

Mean of shell gaping activity

Figure 4. Average of mussel gape activity recorded for 8 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 8 relaible agents and water temperature at ManMarina.

Appendix

Appendix 1. Raw valve gape activity for ManMarina.