# Hobsons Bay > Cite as: PLOT record p/hobsons-bay v1, compiled by PLOT (1961-01-01 to 2025-12-31), place summary - **Address:** p/hobsons-bay (https://www.plot.eco/p/hobsons-bay) - **Kind:** Place summary (compiled from the published claims listed) - **Who said it:** Compiled by PLOT from the published claims listed - **Period:** Claims cover 1850–2027 (5 of 15 undated) - **Checked:** Reviewed (step 3 of 4): Its least-checked claim is reviewed. PLOT checked the claim against its source. This is not independent verification. - **Open questions:** None open - **Evidence shown:** Reviewed and from approved sources. 15 claims shown, all reviewed. The City of Hobsons Bay, a local government area in Melbourne's west. In PLOT it groups the places below; it is not itself assessed. ## Summary - **Period:** Claims cover 1850–2027 (5 of 15 undated) - **Checked:** 15 reviewed - **One next step:** Overlay the Ramsar and KBA boundaries with the Hobsons Bay boundary (https://www.plot.eco/n/CRB2-RR) - **Related places:** Cherry Lake (within it), Jawbone Flora and Fauna Reserve (within it), Jawbone Marine Sanctuary (adjacent) ## What's here (2) Coverage: Native vegetation extent and types: not looked for yet; Threatened species recorded or likely: reviewed claims; Threatened ecological communities: not looked for yet. ### About Cherry Lake, within this place #### Hobsons Bay City Council says the western and northern areas around Cherry Lake include salt marsh habitats used by a range of water birds. > Cite as: PLOT record c/899M-WX v1, Hobsons Bay City Council (undated), reported association - **Address:** c/899M-WX, version 1 of 1 (https://www.plot.eco/c/899M-WX) - **About:** Cherry Lake → Cherry Lake salt marsh habitats - **Kind:** Reported association - **Who said it:** Reported by government - **Period:** undated - **Checked:** Reviewed (step 3 of 4): PLOT checked the claim against its source. This is not independent verification. Checked by a person. - **Open questions:** None open - **Source:** Cherry Lake (Parks and reserves) (Hobsons Bay City Council), Cherry Lake heading (paragraph on the 3.5 km trail) - **The snippet in PLOT:** - **Editions:** hobson-s-bay-pilot-1 - **How we found this:** Found before PLOT's sourcing protocol v0.1 existed. Extracted with Claude Opus 5.5 (Claude Code); a person reviewed it before publication. - **Section:** placed by rule: relationship "contains_habitat": what lives or grows here ### About Jawbone Flora and Fauna Reserve, within this place #### Parks Victoria describes Jawbone Flora and Fauna Reserve as wetlands, open grasslands, a saltmarsh and a mangrove conservation area. > Cite as: PLOT record c/KX0T-E0 v1, Parks Victoria (undated), reported association - **Address:** c/KX0T-E0, version 1 of 1 (https://www.plot.eco/c/KX0T-E0) - **About:** Jawbone Flora and Fauna Reserve → Jawbone Flora and Fauna Reserve saltmarsh and mangrove conservation area - **Kind:** Reported association - **Who said it:** Reported by government - **Period:** undated - **Checked:** Reviewed (step 3 of 4): PLOT checked the claim against its source. This is not independent verification. Checked by a person. - **Open questions:** None open - **Source:** Jawbone Flora and Fauna Reserve (site page) (Parks Victoria), Explore heading - **The snippet in PLOT:** - **Editions:** hobsons-bay-pilot-1-test - **How we found this:** Found before PLOT's sourcing protocol v0.1 existed. Extracted with Claude Opus 5.5 (Claude Code); a person reviewed it before publication. - **Section:** placed by rule: relationship "contains_habitat": what lives or grows here ## Condition and change (1) Coverage: Vegetation and habitat condition: not looked for yet; Gross vegetation loss and change: not looked for yet; Waterway, wetland and coastal condition: not looked for yet. #### Mean sea level at Stony Point rose about 2.6 mm a year from 1993 to 2025 (95% interval 1.49–3.64). > Cite as: PLOT record c/BN1F-2M v1, PSMSL, National Oceanography Centre (1993-01-01 to 2025-12-31), derived - **Address:** c/BN1F-2M, version 1 of 1 (https://www.plot.eco/c/BN1F-2M) - **Value:** 2.56 mm/yr (Mean sea level trend) - **About:** Hobsons Bay - **Kind:** derived - **Who said it:** PLOT model - **Period:** 1993-01-01 to 2025-12-31 - **Checked:** Reviewed (step 3 of 4): PLOT checked the claim against its source. This is not independent verification. Checked by a person. - **Open questions:** None open - **Source:** Permanent Service for Mean Sea Level: monthly mean sea level (Williamstown 93, Stony Point 1033) (PSMSL, National Oceanography Centre), Station 1033 Stony Point, RLR monthly - **The snippet in PLOT:** - **How they know:** climate.sealevel.trend@0.1: least squares on deseasonalised monthly means, 95% interval widened for autocorrelation. - **Uncertainty:** 95% interval 1.49 to 3.64 mm a year. - **Limitations:** A gauge in Western Port, not in Port Phillip; relative to the land it stands on. - **Editions:** october-26th-release - **How we found this:** not recorded - **Section:** placed by rule: measure "Mean sea level trend": condition or change - Chart: Chlorophyll a, annual mean: Hobsons Bay and Central Port Phillip Bay (https://www.plot.eco/v/Z59Y-RA) ## Pressures (0) Coverage: Invasive species pressure: not looked for yet; Development, land use and major projects: not looked for yet. Nothing published in this section yet. That is not the same as nothing being there. ## Protection, rules and obligations (1) Coverage: Protected and conserved areas: reviewed claims; Offsets, credits and conservation obligations: not looked for yet; Local strategies, targets and commitments: not looked for yet. ### About Cherry Lake, within this place #### The council lists the Cherry Lake ornamental pond bushland as a 0.36 hectare conservation area it manages. > Cite as: PLOT record c/XTHA-27 v1, Hobsons Bay City Council (2023-12-01 to 2023-12-31), reported by source - **Address:** c/XTHA-27, version 1 of 1 (https://www.plot.eco/c/XTHA-27) - **Value:** 0.36 ha (Reserve area) - **About:** Cherry Lake - **Kind:** Reported by source - **Who said it:** Reported by government - **Period:** 2023-12-01 to 2023-12-31 - **Checked:** Reviewed (step 3 of 4): PLOT checked the claim against its source. This is not independent verification. Checked by a person. - **Open questions:** None open - **Source:** Biodiversity Strategy 2024-34 (Hobsons Bay City Council), p. 21, p. 21, table 'Conservation Areas managed by Hobsons Bay', row 'Cherry Lake ornamental pond bushland' - **The snippet in PLOT:** - **How they know:** As listed by the council - **Limitations:** Covers a small bushland area only; easy to misread as Cherry Lake's total area. - **Editions:** hobsons-bay-update - **How we found this:** not recorded - **Section:** placed by rule: measure "Reserve area": protected area or rule ## Who's involved (0) Coverage: Place frame and governance: reviewed claims; Who works on nature here: not looked for yet. Nothing published in this section yet. That is not the same as nothing being there. ## NextSteps (0) Coverage: Restoration and management activity: not looked for yet. Nothing published in this section yet. That is not the same as nothing being there. - Overlay the Ramsar and KBA boundaries with the Hobsons Bay boundary (https://www.plot.eco/n/CRB2-RR). Cite as: PLOT record n/CRB2-RR v1, claude-opus-5-5, via Claude chat, prompt research_place@1, started by Rob (PLOT owner) (as of 2026-10-21), proposal ## Open questions and gaps (3) Coverage: Biodiversity data coverage: not looked for yet. - **Evidence gap:** No condition measures found for council conservation areas. Council material gives areas and actions but no vegetation quality, habitat hectare or similar condition scores. What would close it: Any condition assessment of council reserves, with method and date - **Evidence gap:** No total counts of plant, animal or threatened species for Hobsons Bay. The council strategy lists examples of threatened species but gives no totals. What would close it: A species list for the municipality with its source and date, for example from the Victorian Biodiversity Atlas, counted by code - **Evidence gap:** Unknown whether any Ramsar-listed land lies inside the City of Hobsons Bay. The boundary description includes parts of the Cheetham Wetlands but names no local government areas. The KBA factsheet places part of the Cheetham Wetlands between Altona and Altona Meadows. What would close it: An overlay of the Ramsar boundary with the Hobsons Bay LGA boundary, computed by code ## Not yet placed in a section (8) #### At +2 °C of global warming, Hobsons Bay's annual rainfall would be about 576 mm (models range 536 mm–614 mm). > Cite as: PLOT record c/F0B0-BT v1, Queensland Government (Department of Environment, Science and Innovation) (at +2 °C global warming above 1850–1900), modelled or forecast - **Address:** c/F0B0-BT, version 1 of 1 (https://www.plot.eco/c/F0B0-BT) - **Value:** 576.14 mm (Annual rainfall) - **About:** Hobsons Bay - **Kind:** Modelled or forecast - **Who said it:** PLOT model - **Period:** at +2 °C global warming above 1850–1900 - **Checked:** Reviewed (step 3 of 4): PLOT checked the claim against its source. This is not independent verification. Checked by a person. - **Open questions:** None open - **Source:** SILO gridded climate data (daily and monthly, 0.05°) (Queensland Government (Department of Environment, Science and Innovation)), PLOT climate series plot:climate:place:hobsons-bay:self:pr-annual, reference 1961–1990 - **The snippet in PLOT:** - **How they know:** climate.gwl.delta@0.1: IPCC Atlas region SAU, SSP3-7.0, per-model monthly change at the level applied to 1961–1990; median across models. - **Uncertainty:** 10th–90th percentile across models: 536 mm–614 mm. - **Limitations:** Regional change factors, not downscaled. - **Editions:** october-26th-release - **How we found this:** not recorded - **Section:** not yet placed #### At +2 °C of global warming, Hobsons Bay's mean annual temperature would be about 16.4 °C (models range 16.0 °C–16.6 °C). > Cite as: PLOT record c/F3H3-EV v1, Queensland Government (Department of Environment, Science and Innovation) (at +2 °C global warming above 1850–1900), modelled or forecast - **Address:** c/F3H3-EV, version 1 of 1 (https://www.plot.eco/c/F3H3-EV) - **Value:** 16.38 °C (Mean annual temperature) - **About:** Hobsons Bay - **Kind:** Modelled or forecast - **Who said it:** PLOT model - **Period:** at +2 °C global warming above 1850–1900 - **Checked:** Reviewed (step 3 of 4): PLOT checked the claim against its source. This is not independent verification. Checked by a person. - **Open questions:** None open - **Source:** SILO gridded climate data (daily and monthly, 0.05°) (Queensland Government (Department of Environment, Science and Innovation)), PLOT climate series plot:climate:place:hobsons-bay:self:tas-mean-annual, reference 1961–1990 - **The snippet in PLOT:** - **How they know:** climate.gwl.delta@0.1: IPCC Atlas region SAU, SSP3-7.0, per-model monthly change at the level applied to 1961–1990; median across models. - **Uncertainty:** 10th–90th percentile across models: 16.0 °C–16.6 °C. - **Limitations:** Regional change factors, not downscaled. - **Editions:** october-26th-release - **How we found this:** not recorded - **Section:** not yet placed #### Hobsons Bay City Council's Biodiversity Strategy says the council manages over 336 hectares of conservation area across 28 sites. > Cite as: PLOT record c/8X6E-1V v1, Hobsons Bay City Council (2023-12-01 to 2023-12-31), reported by source - **Address:** c/8X6E-1V, version 1 of 1 (https://www.plot.eco/c/8X6E-1V) - **Value:** \> 336 ha (Conservation area managed by the council) - **About:** Hobsons Bay - **Kind:** Reported by source - **Who said it:** Reported by government - **Period:** 2023-12-01 to 2023-12-31 - **Checked:** Reviewed (step 3 of 4): PLOT checked the claim against its source. This is not independent verification. Checked by a person. - **Open questions:** None open - **Source:** Biodiversity Strategy 2024-34 (Hobsons Bay City Council), p. 7, p. 7 - **The snippet in PLOT:** - **How they know:** As stated by the council - **Uncertainty:** The council's 2023 consultation page gives a different figure (over 360 ha, same 28 sites). - **Limitations:** Includes a 33 ha seagrass bed, so it is not all land. - **Editions:** hobsons-bay-update - **How we found this:** not recorded - **Section:** not yet placed #### Hobsons Bay's annual rainfall averaged 501 mm in 1996–2025 (SILO grid). > Cite as: PLOT record c/VRH1-8M v1, Queensland Government (Department of Environment, Science and Innovation) (1996-01-01 to 2025-12-31), derived - **Address:** c/VRH1-8M, version 1 of 1 (https://www.plot.eco/c/VRH1-8M) - **Value:** 500.72 mm (Annual rainfall) - **About:** Hobsons Bay - **Kind:** derived - **Who said it:** PLOT model - **Period:** 1996-01-01 to 2025-12-31 - **Checked:** Reviewed (step 3 of 4): PLOT checked the claim against its source. This is not independent verification. Checked by a person. - **Open questions:** None open - **Source:** SILO gridded climate data (daily and monthly, 0.05°) (Queensland Government (Department of Environment, Science and Innovation)), PLOT climate series plot:climate:place:hobsons-bay:self:pr-annual, now 1996–2025 - **The snippet in PLOT:** - **How they know:** climate.series.grid\_extract@0.1: area-weighted mean of cell means, each cell needing 27 of 30 years. - **Uncertainty:** Interpolated grid. - **Limitations:** Grid cells miss microclimate. - **Editions:** october-26th-release - **How we found this:** not recorded - **Section:** not yet placed #### Hobsons Bay's annual rainfall averaged 591 mm in 1961–1990 (SILO grid). > Cite as: PLOT record c/48SZ-GW v1, Queensland Government (Department of Environment, Science and Innovation) (1961-01-01 to 1990-12-31), derived - **Address:** c/48SZ-GW, version 1 of 1 (https://www.plot.eco/c/48SZ-GW) - **Value:** 590.79 mm (Annual rainfall) - **About:** Hobsons Bay - **Kind:** derived - **Who said it:** PLOT model - **Period:** 1961-01-01 to 1990-12-31 - **Checked:** Reviewed (step 3 of 4): PLOT checked the claim against its source. This is not independent verification. Checked by a person. - **Open questions:** None open - **Source:** SILO gridded climate data (daily and monthly, 0.05°) (Queensland Government (Department of Environment, Science and Innovation)), PLOT climate series plot:climate:place:hobsons-bay:self:pr-annual, reference 1961–1990 - **The snippet in PLOT:** - **How they know:** climate.series.grid\_extract@0.1: area-weighted mean of cell means, each cell needing 27 of 30 years. - **Uncertainty:** Interpolated grid. - **Limitations:** Grid cells miss microclimate. - **Editions:** october-26th-release - **How we found this:** not recorded - **Section:** not yet placed #### Hobsons Bay's mean annual temperature averaged 14.8 °C in 1961–1990 (SILO grid). > Cite as: PLOT record c/R2YP-0Y v1, Queensland Government (Department of Environment, Science and Innovation) (1961-01-01 to 1990-12-31), derived - **Address:** c/R2YP-0Y, version 1 of 1 (https://www.plot.eco/c/R2YP-0Y) - **Value:** 14.85 °C (Mean annual temperature) - **About:** Hobsons Bay - **Kind:** derived - **Who said it:** PLOT model - **Period:** 1961-01-01 to 1990-12-31 - **Checked:** Reviewed (step 3 of 4): PLOT checked the claim against its source. This is not independent verification. Checked by a person. - **Open questions:** None open - **Source:** SILO gridded climate data (daily and monthly, 0.05°) (Queensland Government (Department of Environment, Science and Innovation)), PLOT climate series plot:climate:place:hobsons-bay:self:tas-mean-annual, reference 1961–1990 - **The snippet in PLOT:** - **How they know:** climate.series.grid\_extract@0.1: area-weighted mean of cell means, each cell needing 27 of 30 years. - **Uncertainty:** Interpolated grid. - **Limitations:** Grid cells miss microclimate. - **Editions:** october-26th-release - **How we found this:** not recorded - **Section:** not yet placed #### Hobsons Bay's mean annual temperature averaged 15.4 °C in 1996–2025 (SILO grid). > Cite as: PLOT record c/SFY3-0J v1, Queensland Government (Department of Environment, Science and Innovation) (1996-01-01 to 2025-12-31), derived - **Address:** c/SFY3-0J, version 1 of 1 (https://www.plot.eco/c/SFY3-0J) - **Value:** 15.44 °C (Mean annual temperature) - **About:** Hobsons Bay - **Kind:** derived - **Who said it:** PLOT model - **Period:** 1996-01-01 to 2025-12-31 - **Checked:** Reviewed (step 3 of 4): PLOT checked the claim against its source. This is not independent verification. Checked by a person. - **Open questions:** None open - **Source:** SILO gridded climate data (daily and monthly, 0.05°) (Queensland Government (Department of Environment, Science and Innovation)), PLOT climate series plot:climate:place:hobsons-bay:self:tas-mean-annual, now 1996–2025 - **The snippet in PLOT:** - **How they know:** climate.series.grid\_extract@0.1: area-weighted mean of cell means, each cell needing 27 of 30 years. - **Uncertainty:** Interpolated grid. - **Limitations:** Grid cells miss microclimate. - **Editions:** october-26th-release - **How we found this:** not recorded - **Section:** not yet placed #### The council's strategy sets the objective of an overall increase in biodiversity, ecosystems and habitats by 2027. > Cite as: PLOT record c/GGYK-MJ v1, Hobsons Bay City Council (? to 2027-12-31), target (not achieved performance) - **Address:** c/GGYK-MJ, version 1 of 1 (https://www.plot.eco/c/GGYK-MJ) - **Value:** Overall increase by 2027 (Stated objective (as written by the responsible body)) - **About:** Hobsons Bay - **Kind:** Target (not achieved performance) - **Who said it:** Reported by government - **Period:** ? to 2027-12-31 - **Checked:** Reviewed (step 3 of 4): PLOT checked the claim against its source. This is not independent verification. Checked by a person. - **Open questions:** None open - **Source:** Biodiversity Strategy 2024-34 (Hobsons Bay City Council), p. 18, p. 18, Restore - **The snippet in PLOT:** - **Limitations:** No indicator or baseline was found next to this objective, so progress can't be measured from the strategy alone. - **Editions:** hobsons-bay-update - **How we found this:** not recorded - **Section:** not yet placed ## Sources (7) - SILO gridded climate data (daily and monthly, 0.05°) (Queensland Government (Department of Environment, Science and Innovation)): 6 claims - Biodiversity Strategy 2024-34 (Hobsons Bay City Council): 3 claims - Cherry Lake (Parks and reserves) (Hobsons Bay City Council): 2 claims - Jawbone Flora & Fauna Reserve (Parks and reserves) (Hobsons Bay City Council): 1 claim - Jawbone Flora and Fauna Reserve (site page) (Parks Victoria): 1 claim - Jawbone Marine Sanctuary Management Plan (June 2007) (Parks Victoria): 1 claim - Permanent Service for Mean Sea Level: monthly mean sea level (Williamstown 93, Stony Point 1033) (PSMSL, National Oceanography Centre): 1 claim --- Machine-readable: https://www.plot.eco/p/hobsons-bay.json Cite as: PLOT record p/hobsons-bay v1, compiled by PLOT (1961-01-01 to 2025-12-31), place summary