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Рис. 22. ГнезΑа поΛярных овсянок Schoeniclus pallasi. Остров БайΑуков, заΛив Счастья, июΛь 2022 г. Фото Δ. В. Коробова Fig. 22. Nests of Pallasꞌs Buntings Schoeniclus pallasi. Baydukova Island, Bay of Schastꞌе, July 2022. Photo by D. V. Korobov in New data on rare and insufficiently studied birds of the Shchastya Bay, the Sea of Okhotsk, and adjacent territories (Khabarovsk Krai)

Рис. 22. ГнезΑа поΛярных овсянок Schoeniclus pallasi. Остров БайΑуков, заΛив Счастья, июΛь 2022 г. Фото Δ. В. Коробова Fig. 22. Nests of Pallasꞌs Buntings Schoeniclus pallasi. Baydukova Island, Bay of Schastꞌе, July 2022. Photo by D. V. Korobov

Рис. 19. ПоΛные кΛаΑки камчатской крачки Sterna camtschatica. Остров БайΑукова, заΛив Счастья, 29.07.2022. Фото Δ. В. Коробова Fig. 19. Full clutches of Kamchatka Tern. Baydukova Island, Bay of Schastꞌе, 29.07.2022. Photo by D. V. Korobov in New data on rare and insufficiently studied birds of the Shchastya Bay, the Sea of Okhotsk, and adjacent territories (Khabarovsk Krai)

Рис. 19. ПоΛные кΛаΑки камчатской крачки Sterna camtschatica. Остров БайΑукова, заΛив Счастья, 29.07.2022. Фото Δ. В. Коробова Fig. 19. Full clutches of Kamchatka Tern. Baydukova Island, Bay of Schastꞌе, 29.07.2022. Photo by D. V. Korobov

Рис. 18. ПоΛярная крачка Sterna paradisaea (в центре Λибо на переΑнем пΛане). Остров БайΑукова, заΛив Счастья, 30.06.2022. Фото Δ. В. Коробова Fig. 18. Arctic Tern Sterna paradisaea (in the center or in the foreground). Baydukova Island, Bay of Schastꞌе, 30.06.2022. Photo by D. V. Korobov in New data on rare and insufficiently studied birds of the Shchastya Bay, the Sea of Okhotsk, and adjacent territories (Khabarovsk Krai)

Рис. 18. ПоΛярная крачка Sterna paradisaea (в центре Λибо на переΑнем пΛане). Остров БайΑукова, заΛив Счастья, 30.06.2022. Фото Δ. В. Коробова Fig. 18. Arctic Tern Sterna paradisaea (in the center or in the foreground). Baydukova Island, Bay of Schastꞌе, 30.06.2022. Photo by D. V. Korobov

Рис. 16. Пуховой птенец тихоокеанской чайки Larus schistisagus. ЗаΛив Счастья, остров Чаечный, 14.07.2018. Фото В. В. Пронкевича Fig. 16. Downy chick of the Slaty-backed Gull Larus schistisagus. Bay of Schastꞌе, Chaechny Island, 14.07.2018. Photo by V. V. Pronkevich in New data on rare and insufficiently studied birds of the Shchastya Bay, the Sea of Okhotsk, and adjacent territories (Khabarovsk Krai)

Рис. 16. Пуховой птенец тихоокеанской чайки Larus schistisagus. ЗаΛив Счастья, остров Чаечный, 14.07.2018. Фото В. В. Пронкевича Fig. 16. Downy chick of the Slaty-backed Gull Larus schistisagus. Bay of Schastꞌе, Chaechny Island, 14.07.2018. Photo by V. V. Pronkevich

Рис. 6. Стая горбоносых турпанов Melanitta deglandi. Остров БайΑукова, заΛив Счастья, 17.07.2022. Фото Δ. В. Коробова Fig. 6. Flock of White-winged Scoter Melanitta deglandi. Baydukov Island, Bay of Schastꞌе, 17.07.2022. Photo by D. V. Korobov in New data on rare and insufficiently studied birds of the Shchastya Bay, the Sea of Okhotsk, and adjacent territories (Khabarovsk Krai)

Рис. 6. Стая горбоносых турпанов Melanitta deglandi. Остров БайΑукова, заΛив Счастья, 17.07.2022. Фото Δ. В. Коробова Fig. 6. Flock of White-winged Scoter Melanitta deglandi. Baydukov Island, Bay of Schastꞌе, 17.07.2022. Photo by D. V. Korobov

Рис. 1. Карта района иссΛеΑований. УсΛовные обозначения: красными кружками показаны базовые Λагеря; фиоΛетовой штриховкой — территория ΛанΑшафтного памятника прироΑы местного значения «ВΛасьевские торфяники»; синей штриховкой — акватория памятника прироΑы краевого значения «ЗаΛив Счастья с островами Кевор и Чаечный» Fig. 1. Map of the study area. Legend: red circles show base camps; purple shading — the territory of the landscape natural monument of local importance "Vlasyevsky Torfyaniky"; blue shading — the water area is a natural monument of regional significance "The Bay of Schastꞌе with the islands of Kevor and Chaechny" in New data on rare and insufficiently studied birds of the Shchastya Bay, the Sea of Okhotsk, and adjacent territories (Khabarovsk Krai)

Рис. 1. Карта района иссΛеΑований. УсΛовные обозначения: красными кружками показаны базовые Λагеря; фиоΛетовой штриховкой — территория ΛанΑшафтного памятника прироΑы местного значения «ВΛасьевские торфяники»; синей штриховкой — акватория памятника прироΑы краевого значения «ЗаΛив Счастья с островами Кевор и Чаечный» Fig. 1. Map of the study area. Legend: red circles show base camps; purple shading — the territory of the landscape natural monument of local importance "Vlasyevsky Torfyaniky"; blue shading — the water area is a natural monument of regional significance "The Bay of Schastꞌе with the islands of Kevor and Chaechny"

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Figure 1 in Life in the extreme environment: Structure and species richness of bird assemblages on Yuzhny Island of Novaya Zemlya, Russia

Figure 1. Study region on Yuzhny Island of Novaya Zemlya. (A) Map of Novaya Zemlya. The yellow circle indicates the study region of Yuzhny Island. (B) Detailed map of the study region with the location of counting routes. The shaded area represents the study area (1). The dashed red lines indicate the counting routes (2). The dashed black line indicates the helicopter route (3).

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Figure 4 in Life in the extreme environment: Structure and species richness of bird assemblages on Yuzhny Island of Novaya Zemlya, Russia

Figure 4. Relative bird species abundance (log10 scale) over habitat patches on Yuzhny Island of Novaya Zemlya. Numbers of (01) – (10) are the codes of the habitat types. Differences between assemblages were all significant (Kruskal-Wallis test: p = 0.003). Images show habitat types; numbers indicate their codes (see Table 2 for detail). (Photos: V. M. Spitsyn).

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Figure 3 in Life in the extreme environment: Structure and species richness of bird assemblages on Yuzhny Island of Novaya Zemlya, Russia

Figure 3. Species diversity of bird assemblages on Yuzhny Island of Novaya Zemlya. (A) Bi-plot of detrended correspondence analysis (DCA) with supplementary variables, showing the ordination of species and environmental variables. Circles indicate bird species abundance (categorical estimations by using a logarithmic scale, see Table 3), abundances decrease with increasing distance from each point in a unimodal fashion (ter Braak and Smilauer, 2002). Data represent independent samples from various habitats (n = 10). Total variation is 2.44, supplementary variables account for 66.1% (adjusted explained variation is 23.8%). Eigenvalues (lambda) are 0.675, 0.162, 0.069, and 0.025 for first (horizontal), second (vertical), third and fourth axes, respectively. The first two axes explain 34.4% of the variation. The pseudo-canonical correlations of bird abundance and environmental variables for axes 1 and 2 are 0.77 and 0.91, respectively. For an explanation of environmental variables, see Table 4. For abbreviations of species names see Fig. 4. (B) Bi-plot of the same analysis revealing the ordination of species richness over a range of habitats and environmental variables. Circles indicate bird assemblages in primary types of habitats (size of each circle corresponds to the number of bird species). The red numbers near the circles indicate species richness. The black numbers near the circles (01–10) indicate the codes of habitat types (see Fig. 4 and Table 2 for detail).

Figure 19 in Are some of the birds endemic to the Tres Marías Islands (Mexico) species?

Figure 19. Mainland Rufous-backed Robin Turdus rufopalliatus far from the Tres Marías, with an anomalous grey breast-band resembling T. r. graysoni and note the prominent throat streaks and warm-coloured back, wing-coverts and flanks, Cuernavaca, Morelos, Mexico, June 2017 (Juan Manuel Ramos Merino)

Figure 20. Presumed Rufousbacked Robin Turdus rufopalliatus graysoni with mainly narrow throat streaks, a in Are some of the birds endemic to the Tres Marías Islands (Mexico) species?

Figure 20. Presumed Rufousbacked Robin Turdus rufopalliatus graysoni with mainly narrow throat streaks, a strong salmon wash on the breast, and wing-coverts and back colours close to those of non-graysoni T. rufopalliatus, Isla María Cleofas, November 2015 (Javier Cruz Nieto)

Figure 15 in Are some of the birds endemic to the Tres Marías Islands (Mexico) species?

Figure 15. Back patern, size and intensity of orange in Streak-backed Oriole Icterus pustulatus specimens from Nayarit, from left to right: two typical microstictus / yaegeri, two presumed hybrids (with Phillips' specimen at right) and a typical graysoni; note the similar overall size of graysoni and Phillips' specimen, which is, however, more orange overall (especially the head), while the other presumed hybrid (which appears almost as long due to specimen preparation) has back streaks intermediate between graysoni and typical mainland Nayarit orioles (Héctor Gómez de Silva)

Figure 11 in Are some of the birds endemic to the Tres Marías Islands (Mexico) species?

Figure 11. Pair of Mexican Parrotlets Forpus cyanopygius insularis copulating, Isla María Cleofas, May 2016; note the male's pale malachite-green underparts, neck-sides and postocular region contrasting with the yellower green cheeks, throat, forehead and forecrown, and that the male's undertail-coverts are not concolorous with the breast and belly (contra Grant 1965a) (Javier Cruz Nieto)

Figure 12 in Are some of the birds endemic to the Tres Marías Islands (Mexico) species?

Figure 12. Instituto de Biología, Universidad Nacional Autónoma de México specimens of Mexican Parrotlet Forpus cyanopygius from Nayarit; the two specimens on the right are adult male insularis, their malachitegreen breast and belly contrasts strongly with the throat, unlike in cyanopygius specimens (Héctor Gómez de Silva)

Figure 8 in Are some of the birds endemic to the Tres Marías Islands (Mexico) species?

Figure 8. Presumed hybrid Broad-billed Hummingbird Cynanthus lawrencei × magicus specimen, Isla María Cleofas, April 2016 (Héctor Gómez de Silva)

Figure 7 in Are some of the birds endemic to the Tres Marías Islands (Mexico) species?

Figure 7. Presumed hybrid Broad-billed Hummingbird Cynanthus lawrencei × magicus specimen in the Instituto de Biología, Universidad Nacional Autónoma de México collection; note magicus-like blue throat and lawrencei-like white-edged grey undertail-coverts (Héctor Gómez de Silva)

Figure 5 in Are some of the birds endemic to the Tres Marías Islands (Mexico) species?

Figure 5. Two specimens of male Broad-billed Hummingbirds Cynanthus latirostris with similarly grey anterior undertailcoverts and white or whitish posterior undertail-coverts; above C. l. magicus, below, C. l. lawrencei (Héctor Gómez de Silva)

Fig. 4 in Are some of the birds endemic to the Tres Marías Islands (Mexico) species?

Fig. 4. Typical undertail-coverts colour of male Broad-billed Hummingbird Cynanthus latirostris magicus (two specimens at left) and C. l. lawrencei (two specimens at right), from specimens in the Instituto de Biología, Universidad Nacional Autónoma de México collection (Héctor Gómez de Silva)

Figure 14 in Are some of the birds endemic to the Tres Marías Islands (Mexico) species?

Figure 14. Cinnamon underwing-coverts of Happy Wren Pheugopedius felix pallidus (above) compared to the contrasting white underwing-coverts of the warmest-breasted P. f. lawrencii specimen in the Instituto de Biología, Universidad Nacional Autónoma de México collection (right) (Héctor Gómez de Silva)

Figure 1 in Are some of the birds endemic to the Tres Marías Islands (Mexico) species?

Figure 1. Map showing the location of the Tres Marías Islands with respect to the adjacent mainland (modified from Wilson 1991). The arrows show the two closest routes between the islands and the mainland. The approximate locations of the cities Mazatlán and Puerto Vallarta are indicated. Numbers indicate mainland localities mentioned in the text where Tres Marías taxa or hybrids have been recorded: 1. 'Labrados' (based on Fig. 1 in McLellan 1927), 2. 'Novilleros, west of Acaponeta' = Playa Novillero, 3. Santiago Ixcuintla, 4. Sauta, 5. San Blas and 1 3/4 km north of Singaíta, 6. Chacala, 7. Las Varas, 8. La Peñita de Jaltemba, 9. El Oro, and 10. Todos Santos.