Gavia
Enable an agent to recognise a bird as Gavia, assess its observed condition and ecological context, and select justified observation, protection or referral actions.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
Researched by: Codex + Grok
Purpose and description
Enable an agent to recognise a bird as Gavia, assess its observed condition and ecological context, and select justified observation, protection or referral actions.
Genus of diving waterbirds (loons/divers) in the family Gaviidae.
It can be Compare photographs and field observations with species- and plumage-appropriate references, retaining Gavia sp. when necessary.; Record repeated dive, feeding and movement observations with observation effort and tracking uncertainty.; Associate sightings with breeding, feeding and seasonal sites without inferring permanent residency.; Adjust observation position or activity when a documented response indicates disturbance.; Refer evidence of injury, entanglement or stranding to an appropriate wildlife responder.; Check species, location and applicable authority before proposing capture, marking, sampling or relocation..
Distinguishing features
Check taxonomic rank: Gavia denotes a genus within Gaviidae, not the Common Loon alone or every diving waterbird. [ITIS Gavia record](https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=174468).
Compare the combined bill shape, elongated body, swimming profile and flight silhouette against grebes, cormorants and diving ducks; diving behaviour alone does not establish Gavia. Common Loon provides one species-specific reference, not a universal silhouette. [Cornell Common Loon identification](https://www.allaboutbirds.org/guide/Common_Loon/id).
Test identification against smaller, slender-billed loons as well as large, heavy-billed forms; a Common Loon appearance must not become a genus-wide requirement. [Cornell Red-throated Loon identification](https://www.allaboutbirds.org/guide/Red-throated_Loon/id).
Recheck identification using age- and season-appropriate plumage: absence of the Common Loon's conspicuous breeding pattern does not exclude even that species. [Cornell Common Loon identification](https://www.allaboutbirds.org/guide/Common_Loon/id).
Scope
+ Assignment to Gavia, with evidence and unresolved alternative identifications
+ Species, age and plumage qualifications needed to interpret a loon observation
+ Swimming, diving, feeding and flight capability of an observed bird
+ Breeding, chick dependence and seasonal use of aquatic sites
+ Observed threats, disturbance responses and prerequisites for intervention
- Complete species-level models for individual Gavia species
- Lake, river, coastal and marine ecosystem condition beyond its relevance to the bird
- Independent models of prey populations and food webs
- Veterinary diagnosis, treatment protocols and rehabilitation facility management
- Wildlife legislation and permit administration
- Fossil specimen description and reconstruction of extinct taxa
Characteristics
- Taxonomic assignment
- Gavia sp.; supported species assignment; tentative Gavia; unresolved diving waterbird Controls which species-specific expectations can be applied without turning uncertainty into a false identification.
- Identification evidence
- Links to dated photographs, recordings, field observations or specimen determinations and the identification authority Allows another observer to reassess difficult nonbreeding or distant birds.
- Bill and head profile
- Observed bill thickness, colour, carriage and head contour; obscured; unknown Supports comparison among loon species and similar waterbirds without relying on a single mark.
- Age and plumage assessment
- Age: chick, immature, adult or unknown; plumage: breeding, nonbreeding, transitional or unknown Separates appearance changes from taxonomic differences and helps interpret dependence.
- Dive duration
- Seconds between observed submergence and resurfacing, with tracking confidence Supports behavioural assessment only when the same bird is followed and missed resurfacing is excluded.
- Aquatic activity
- Resting, swimming, diving, prey handling, preening, interacting or unknown Distinguishes observed behaviour from inferred feeding success or distress.
- Site use
- Dated association with breeding water, feeding water, migration stopover or nonbreeding site; role uncertain Makes habitat interpretation conditional on species, season and direct evidence.
- Reproductive association
- Nest attendance, incubation, accompanying chicks, provisioning, no reproductive evidence or unknown Identifies potential dependence and disturbance sensitivity without treating adult presence as breeding proof.
- Functional condition
- Observed swimming, diving and flight performance; visible impairment; unassessed Separates demonstrated ability from an ability that has simply not been observed.
- Threat evidence
- Dated observations of attached fishing gear, surface contamination, collision, disturbance or other suspected exposure Supports a documented response without asserting an unverified cause or diagnosis.
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 11 findings · 21 questions.
Loon identity Establish whether the subject belongs to Gavia and how far identification can be resolved.
A genus-level record must accommodate multiple loon species and uncertain observations without silently becoming a Common Loon model.
Taxonomic anchor
Connect the registry name to a documented biological concept.
Gavia concept
Record the authority and rank supporting the interpretation of Gavia, separately from the identity of an observed bird.
- Does registry provenance confirm that vr.tr.gavia denotes the loon genus rather than another use of Gavia? definition
- Which taxonomic authority and version govern accepted membership and name mappings? provenance
Field discrimination
Evaluate visible and audible evidence against plausible alternatives.
Supported identification
Retain diagnostic observations, competing identifications and the finest supported taxonomic resolution.
- Which observed bill, head, body, plumage or vocal features support Gavia over the local grebes, cormorants and diving ducks? boundary
- Do viewing conditions and age-specific marks support a species determination, or only Gavia sp.? measurement
Aquatic performance Describe how the observed loon moves and obtains food in its immediate setting.
Diving and surface behaviour are central to assessment, but observation gaps can easily be mistaken for impairment or feeding failure.
Dive and surface cycle
Track submergence, resurfacing and surface activity for a reliably followed bird.
Observed dive performance
Record timed behaviour with visibility, water conditions and uncertainty about individual continuity.
- What dive durations and surface intervals were observed, and how was the same bird tracked? measurement
- Could waves, distance or an unseen resurfacing explain an apparently prolonged dive? boundary
Feeding evidence
Distinguish searching and diving from demonstrated prey capture or provisioning.
Prey acquisition
Record visible prey handling and transfer without assuming that every dive produces food.
- Was prey capture, swallowing or delivery to a chick actually observed? measurement
- What evidence supports the prey identification and distinguishes it from an unidentified object? provenance
Seasonal water use Relate loon observations to particular waters, seasons and movement opportunities.
A sighting alone cannot establish breeding, residency or habitat suitability across the genus.
Site role
Determine what the bird demonstrably uses a waterbody for.
Documented water association
Link dated observations to a site role while separating actual use from range-based expectations.
- Do observations establish feeding, resting, breeding or passage at this site? measurement
- Which species-specific evidence supports interpreting this freshwater or coastal occurrence in this season? provenance
Movement opportunity
Assess observed access to usable water and departure options.
Departure and confinement
Record actual movement constraints without assigning one takeoff requirement to all Gavia.
- What open water, ice, obstacles and attempted departures were observed? measurement
- What species- and condition-specific evidence is needed before calling this bird stranded or unable to depart? boundary
Breeding and dependence Assess reproductive activity and the relationships on which dependent young rely.
Nest attendance and adult-chick interactions change the significance of disturbance and any proposed intervention.
Nest association
Separate confirmed nesting behaviour from an adult merely occupying suitable water.
Breeding evidence
Record nesting evidence, timing and observation limits without requiring an intrusive nest inspection.
- What observed attendance, incubation or chick evidence supports the assigned breeding stage? measurement
- Can missing evidence be obtained through distant observation without approaching the suspected nest? action
Dependent young
Track observed chick association, provisioning and separation.
Adult-chick continuity
Record dependence directly and avoid inferring abandonment from a brief absence.
- How many chicks were visible, and what adult attendance or food transfers were observed over what duration? measurement
- What species- and age-specific evidence would distinguish ordinary separation from a situation requiring expert assessment? boundary
Condition and response Connect evidence of impairment or disturbance to proportionate, authorised action.
An agent must distinguish unobserved capability, normal loon behaviour and credible injury before recommending interference.
Impairment evidence
Assess visible condition and function without substituting remote inference for diagnosis.
Functional concern
Document abnormal movement, attached gear or contamination and preserve uncertainty about cause.
- Which swimming, diving, posture or wing-use abnormalities were directly observed, and for how long? measurement
- Is the suspected fishing gear or contamination visible in supporting evidence, or only inferred from behaviour? provenance
Intervention decision
Choose between continued observation, reducing disturbance and specialist referral.
Justified next action
Tie the proposed action to observed urgency, dependent young, responder competence and verified local requirements.
- Does the evidence support withdrawing, monitoring from farther away or contacting a wildlife responder now? action
- Before capture, marking, sampling or relocation, which applicable permissions and qualified personnel must be verified? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Kinds and varieties
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Common loon / Great northern diver
- Red-throated loon
- Black-throated loon / Arctic loon
- Pacific loon
- Yellow-billed loon / White-billed diver
- Which of these kinds and varieties hold for the sense of Gavia this model covers, and on what evidence? provenance
Sources
- pending research - will be replaced after lookups
What the second pass must settle
- Does registry provenance confirm the genus interpretation, and does an existing Vercy model already own this concept?
- Should extinct species assigned to Gavia be represented here through taxonomic links, or remain entirely within palaeontological models?
- Which validated identification criteria resolve difficult immature and nonbreeding birds, particularly Arctic versus Pacific and Common versus Yellow-billed Loons?
- Which species-, age- and season-specific baselines support interpretation of dive behaviour, flight capability and adult-chick separation?
- Which local disturbance guidance and responder criteria can support action decisions without inventing universal approach distances or intervention thresholds?