diff --git a/engine/src/modules/management/turn_processor.gd b/engine/src/modules/management/turn_processor.gd
index 0d42f8ca..cc27e4ad 100644
--- a/engine/src/modules/management/turn_processor.gd
+++ b/engine/src/modules/management/turn_processor.gd
@@ -30,6 +30,9 @@ const ClimateEffectsScript: GDScript = preload(
 	"res://engine/src/modules/climate/climate_effects.gd"
 )
 const WeatherScript: GDScript = preload("res://engine/src/modules/climate/weather.gd")
+const EcosystemScript: GDScript = preload(
+	"res://engine/src/modules/ecology/ecosystem.gd"
+)
 
 var unit_manager: RefCounted  # UnitManager — set by TurnManager._ready()
 var spell_system: RefCounted  # SpellSystem — set by TurnManager._ready()
@@ -38,6 +41,8 @@ var weather: RefCounted  # Weather — set by TurnManager._ready()
 var climate: RefCounted  # Climate — set by TurnManager._ready()
 var climate_effects: RefCounted  # ClimateEffects — set by TurnManager._ready()
 var marine_harvest: RefCounted  # MarineHarvest — set by TurnManager._ready()
+var ecosystem: RefCounted  # EcosystemOrchestrator — set by TurnManager._ready()
+var ecology_db: RefCounted  # EcologyDB — set by TurnManager._ready()
 
 
 func _process_production(player: RefCounted) -> void:  # Player
@@ -181,7 +186,7 @@ func _process_healing(player: RefCounted) -> void:  # Player
 		# Terrain power unit effects apply regardless of movement (e.g. undead regen on swamp)
 		var tile: Variant = game_map.get_tile(unit.position)
 		if tile != null:
-			TerrainAffinityScript.apply_terrain_power_unit_effect(unit, tile.terrain_id, game_map)
+			TerrainAffinityScript.apply_terrain_power_unit_effect(unit, tile.biome_id, game_map)
 			# Dead zone: summoned units lose 5 HP/turn when mana_density < threshold
 			_apply_dead_zone_damage(unit, tile)
 
@@ -382,6 +387,11 @@ func _process_climate(game_map: RefCounted) -> void:  # GameMap
 	(weather as WeatherScript).process_turn(game_map)
 	(climate as ClimateScript).process_turn(game_map, GameState.turn_number, GameState.map_seed)
 	(climate_effects as ClimateEffectsScript).process_turn(game_map, weather, GameState.players)
+	# Step 5: Ecosystem — flora dynamics, fauna dynamics, quality recomputation
+	if ecosystem != null and ecology_db != null:
+		(ecosystem as EcosystemScript).process_turn(
+			game_map, ecology_db, GameState.map_seed + GameState.turn_number
+		)
 
 
 func _apply_dead_zone_enchantment_decay(sys: RefCounted, player: RefCounted) -> void: