| י 4 ) טבלן גמדי | ||||||||||
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:טבלן גמד , הקטן והשכיח בין הטבלנים באזורנו. צבעו חום בעונת ההזדוגות לחייו וגרונו בצבע הערמון וכתם לבן , בבסיס מקורו. בחורף הלחיים והצואר ערמוניים וכיפת ראשו משחירה . לצעירים כתמים לבנים בלחיים . בניגוד לשאר הטבלנים מצוי יותר בנהרות ונחלים ופחות בחופי ים . בישראל מצוי ומקנן | ||||||||||
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Subspecies and Distribution.
T. r. ruficollis Europe E to Urals, NW Africa. T. r. iraquensis Iraq, Iran. T. r. capensis Africa Sof Sahara, Madagascar. Caucasus throug India and Sri Lanka to Burma. T. r. poggei Taiwan, Japan and Kuril Is. T. r. philippensis Philippines. T. r. cotabato Mindanao. T. r. tricolor Solawesi to New Guinea and Timor. T. r. vulcanorum Java to Timor. T. r. collaris New Guinea to Solomon Is. | ||||||||||
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Descriptive notes.
25-29 cm; 130-250 g; As in most grebes, female marginally smaller. Chestnut throat, cheeks and foreneck separates from oter Tachybaptus. Iris red-brown, yellow in E Asia. Non-breeding adult paler, especially on throat and foreneck, which lackchestnut, Juvenile similar to non-breeding adult, but head striped black and whitish. Races separated mainly on size, amount of white in secondaries; also slight differences in coloration. . Habitat. Wide range of wetlands normally small and shallow, including small lakes, ponds, canals; also sheltered bays, vegetated shores of larger lakes and reservoirs. Outwithbreeding season, occurs on more open waters; rarely on coast, in estuaries protectedfrom large waves. . Food and Feeding Mainly insects and larvae, especially mayflies, stoneflies, waterbugs, beetles; also molluscs, crustaceans and amphibians. Feeds mainly by diving for 10-25 sec' to depthof 1-2 m'. . Breeding. Season very variable, depending on growth of emergent vegetation and water level;The nest is floating platform of aquatic plants anchored to submerged vegetation.Usually 4 eggs; 2 broods, possibly 3 in warmer regions; incubation 20-25days: Oldest ringed bird 13 years old. . Movements. Resident, migratory and dispersive, depending on winter temperatures of breedinggrounds. Some birds winter in tidal estuaries and sheltered bays, but generally farless common in such habitats than other grebes. Frequent records outwith main range, even in unsuitable habitat, indicate considerable capacity for aerial reconnaissance and colonization of new areas. . Status and Conservation. Not globally threatened. Widespred and common in most of range, Well sudied areas in Europe show fluctuation in numbers, related mainly to winter conditions. . Israel. In Israel subspecies T. r. ruficollis. Quite common resident, common migrant and winter visitor. Breeding summer visitor. . |
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