| argentina | santa fe province | aythya ferina | species | 0 | 1 |
| australia | | aythya australis | species | 2 | 0 |
| australia | victoria | aythya australis | species | 1 | 0 |
| canada | | aythya americana | species | 1 | 0 |
| canada | alberta | aythya affinis | species | 12 | 1 |
| canada | alberta | aythya americana | species | 2 | 0 |
| canada | alberta | aythya ferina | species | 0 | 1 |
| canada | alberta | aythya marila | species | 2 | 0 |
| canada | alberta | aythya valisineria | species | 1 | 0 |
| canada | british columbia | aythya affinis | species | 7 | 0 |
| canada | british columbia | aythya collaris | species | 2 | 1 |
| canada | british columbia | aythya marila | species | 0 | 1 |
| canada | manitoba | aythya affinis | species | 0 | 2 |
| canada | manitoba | aythya americana | species | 1 | 0 |
| canada | manitoba | aythya collaris | species | 2 | 0 |
| canada | manitoba | aythya valisineria | species | 2 | 1 |
| canada | new brunswick | aythya collaris | species | 1 | 0 |
| canada | new brunswick | aythya marila | species | 1 | 1 |
| canada | newfoundland and labrador | aythya affinis | species | 1 | 0 |
| canada | newfoundland and labrador | aythya americana | species | 1 | 0 |
| canada | newfoundland and labrador | aythya collaris | species | 1 | 0 |
| canada | newfoundland and labrador | aythya marila | species | 1 | 0 |
| canada | northwest territories | aythya affinis | species | 0 | 1 |
| canada | northwest territories | aythya marila | species | 0 | 1 |
| canada | nova scotia | aythya affinis | species | 1 | 0 |
| canada | nova scotia | aythya collaris | species | 0 | 1 |
| canada | nova scotia | aythya marila | species | 3 | 0 |
| canada | ontario | aythya affinis | species | 3 | 0 |
| canada | ontario | aythya americana | species | 2 | 0 |
| canada | ontario | aythya collaris | species | 3 | 2 |
| canada | ontario | aythya marila | species | 1 | 1 |
| canada | ontario | aythya valisineria | species | 1 | 0 |
| canada | prince edward island | aythya affinis | species | 1 | 0 |
| canada | prince edward island | aythya collaris | species | 0 | 1 |
| canada | quebec | aythya collaris | species | 1 | 0 |
| canada | quebec | aythya marila | species | 1 | 1 |
| canada | quebec | aythya valisineria | species | 0 | 1 |
| canada | saskatchewan | aythya affinis | species | 1 | 2 |
| canada | saskatchewan | aythya valisineria | species | 1 | 1 |
| canada | yukon | aythya marila | species | 0 | 1 |
| china | | aythya baeri | species | 2 | 0 |
| china | | aythya ferina | species | 2 | 0 |
| china | | aythya nyroca | species | 2 | 0 |
| china | hunan | aythya ferina | species | 0 | 1 |
| china | jilin | aythya fuligula | species | 4 | 0 |
| china | qinghai | aythya ferina | species | 0 | 1 |
| china | qinghai | aythya fuligula | species | 1 | 0 |
| china | shandong | aythya fuligula | species | 1 | 0 |
| czech republic | south bohemian region | aythya fuligula | species | 8 | 0 |
| estonia | | aythya fuligula | species | 2 | 0 |
| finland | | aythya fuligula | species | 3 | 0 |
| georgia | | aythya fuligula | species | 8 | 0 |
| germany | | aythya ferina | species | 2 | 0 |
| germany | | aythya marila | species | 2 | 0 |
| germany | | aythya nyroca | species | 2 | 0 |
| germany | baden-wuerttemberg | aythya fuligula | species | 4 | 0 |
| germany | bavaria | aythya fuligula | species | 0 | 2 |
| germany | brandenburg | aythya fuligula | species | 0 | 1 |
| germany | lower saxony | aythya fuligula | species | 0 | 1 |
| germany | mecklenburg-vorpommern | aythya fuligula | species | 1 | 1 |
| germany | saxony | aythya fuligula | species | 0 | 1 |
| germany | schleswig-holstein | aythya fuligula | species | 0 | 1 |
| hong kong | | aythya fuligula | species | 1 | 0 |
| india | haryana | aythya ferina | species | 0 | 1 |
| iran | | aythya fuligula | species | 1 | 0 |
| iran | mazandaran province | aythya ferina | species | 0 | 1 |
| iraq | saladin governorate | aythya nyroca | species | 1 | 0 |
| japan | aichi prefecture | aythya ferina | species | 16 | 0 |
| japan | aichi prefecture | aythya marila | species | 8 | 0 |
| japan | fukushima prefecture | aythya fuligula | species | 0 | 1 |
| japan | hyogo prefecture | aythya fuligula | species | 8 | 0 |
| japan | miyagi ken prefecture | aythya fuligula | species | 1 | 0 |
| japan | shimane prefecture | aythya fuligula | species | 0 | 1 |
| japan | yamaguchi prefecture | aythya ferina | species | 9 | 0 |
| japan | yamaguchi prefecture | aythya fuligula | species | 1 | 0 |
| japan | yamaguchi prefecture | aythya marila | species | 1 | 0 |
| kazakhstan | almaty region | aythya nyroca | species | 2 | 0 |
| latvia | | aythya fuligula | species | 4 | 0 |
| latvia | engure municipality | aythya ferina | species | 0 | 1 |
| latvia | engure municipality | aythya fuligula | species | 0 | 1 |
| mexico | baja california sur | aythya affinis | species | 2 | 0 |
| mexico | sonora | aythya americana | species | 1 | 1 |
| mongolia | | aythya ferina | species | 2 | 0 |
| norway | | aythya fuligula | species | 1 | 0 |
| norway | hordaland county | aythya fuligula | species | 1 | 0 |
| norway | sor-trondelag county | aythya fuligula | species | 1 | 0 |
| norway | sor-trondelag county | aythya marila | species | 1 | 0 |
| poland | podlasie province | aythya ferina | species | 0 | 1 |
| poland | podlasie province | aythya fuligula | species | 0 | 1 |
| poland | podlasie province | aythya marila | species | 0 | 1 |
| poland | pomorskie province | aythya fuligula | species | 0 | 1 |
| poland | west pomerania province | aythya fuligula | species | 0 | 4 |
| poland | west pomerania province | aythya marila | species | 0 | 2 |
| russia | chukotka autonomous okrug | aythya marila | species | 2 | 0 |
| russia | irkutsk oblast | aythya fuligula | species | 10 | 0 |
| russia | kaliningrad oblast | aythya marila | species | 7 | 0 |
| russia | kamchatka krai | aythya marila | species | 6 | 0 |
| russia | sakha republic | aythya marila | species | 1 | 0 |
| russia | sverdlovsk oblast | aythya fuligula | species | 4 | 0 |
| russia | tyumen oblast | aythya fuligula | species | 3 | 0 |
| russia | yamalo-nenets autonomous okrug | aythya fuligula | species | 1 | 0 |
| russia | yamalo-nenets autonomous okrug | aythya marila | species | 4 | 0 |
| south korea | | aythya ferina | species | 1 | 0 |
| spain | valencia | aythya ferina | species | 0 | 1 |
| sweden | | aythya fuligula | species | 29601 | 0 |
| sweden | | aythya marila | species | 1 | 0 |
| sweden | blekinge | aythya fuligula | species | 7 | 0 |
| sweden | blekinge | aythya marila | species | 1 | 0 |
| sweden | skane | aythya ferina | species | 1 | 0 |
| sweden | sodermanland | aythya ferina | species | 1 | 0 |
| switzerland | | aythya fuligula | species | 12 | 0 |
| ukraine | autonomous republic of crimea | aythya ferina | species | 0 | 1 |
| ukraine | kherson oblast | aythya affinis | species | 0 | 1 |
| ukraine | kherson oblast | aythya americana | species | 0 | 1 |
| united states | | aythya affinis | species | 1 | 0 |
| united states | | aythya marila | species | 1 | 0 |
| united states | alaska | aythya affinis | species | 27 | 2 |
| united states | alaska | aythya americana | species | 3 | 0 |
| united states | alaska | aythya collaris | species | 2 | 1 |
| united states | alaska | aythya fuligula | species | 3 | 0 |
| united states | alaska | aythya marila | species | 50 | 0 |
| united states | alaska | aythya valisineria | species | 3 | 0 |
| united states | arkansas | aythya affinis | species | 0 | 1 |
| united states | california | aythya collaris | species | 0 | 2 |
| united states | california | aythya marila | species | 0 | 1 |
| united states | california | aythya valisineria | species | 0 | 1 |
| united states | connecticut | aythya marila | species | 0 | 1 |
| united states | florida | aythya affinis | species | 0 | 1 |
| united states | illinois | aythya affinis | species | 0 | 2 |
| united states | indiana | aythya affinis | species | 0 | 1 |
| united states | iowa | aythya affinis | species | 0 | 1 |
| united states | kentucky | aythya affinis | species | 1 | 0 |
| united states | louisiana | aythya affinis | species | 0 | 2 |
| united states | louisiana | aythya americana | species | 0 | 1 |
| united states | maryland | aythya collaris | species | 1 | 0 |
| united states | michigan | aythya affinis | species | 0 | 1 |
| united states | minnesota | aythya affinis | species | 0 | 3 |
| united states | mississippi | aythya affinis | species | 0 | 2 |
| united states | mississippi | aythya valisineria | species | 0 | 1 |
| united states | nebraska | aythya affinis | species | 0 | 1 |
| united states | new jersey | aythya marila | species | 0 | 1 |
| united states | new york | aythya marila | species | 0 | 1 |
| united states | north carolina | aythya collaris | species | 0 | 1 |
| united states | north dakota | aythya affinis | species | 0 | 1 |
| united states | south dakota | aythya affinis | species | 0 | 1 |
| united states | texas | aythya affinis | species | 0 | 1 |
| united states | texas | aythya americana | species | 8 | 0 |
| united states | texas | aythya collaris | species | 0 | 1 |
| united states | washington | aythya americana | species | 0 | 1 |
| united states | washington | aythya collaris | species | 0 | 1 |
| united states | wisconsin | aythya affinis | species | 0 | 1 |
| united states | wisconsin | aythya valisineria | species | 0 | 1 |