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Volume 52, No. 2

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Status of terns on Nakhiloo Island, Persian Gulf, with emphasis on Lesser Crested Terns Thalasseus bengalensis.


Authors

HAMED GHANAATIAN1*, ALIREZA SAFAHIEH1, KEIVAN KABIRI2 & AHMAD SAVARI1
1Marine Biology Department, Marine Science and Oceanography Faculty, Khorramshahr University of Marine Science and Technology (KMSU), Khorramshahr, Khuzestan, Iran *(hamed.ghanaatian@gmail.com)
2Oceanic Data Management & Remote Sensing Department, Iranian National Institute for Oceanography and Atmospheric Science (INIOAS), Tehran, Iran

Citation

GHANAATIAN, H., SAFAHIEH, A., KABIRI, K. & SAVARI, A. 2024. Status of terns on Nakhiloo Island, Persian Gulf, with emphasis on Lesser Crested Terns Thalasseus bengalensis.. Marine Ornithology 52: 373 - 377
http://doi.org/10.5038/2074-1235.52.2.1604

Received 10 January 2024, accepted 16 April 2024

Date Published: 2024/10/15
Date Online: 2024/10/11
Key words: Bridled Tern, chick-rearing habitat, global warming, Lesser Crested Tern, migratory seabirds, Greater Crested Tern, sympatric breeding species

Abstract

Lesser Crested Tern Thalasseus bengalensis (LCT) is the second most abundant tern in the Persian Gulf region. Stratified random sampling was used to census the colonies on Nakhiloo Island, Iran. On average, 9.45 eggs, 2.2 early chicks, and 1.1 empty nests with material were counted in each 1×1 m plot in late June 2022. Analysis of those results indicated the breeding population of LCT on Nakhiloo Island to be 31 786 pairs. Other terns and plovers were also present in five of seven LCT subcolonies. Variable sea-surface temperatures (SST) with a slight upward trend and a decrease in chlorophyll a (Chl a) were evident in waters surrounding the island during 2002-2021, but it is unknown whether the tern population has or will be affected by changes in the food web caused by these evident changing oceanographic conditions. Results show that Nakhiloo Island is a hotspot for tern colonies in the Persian Gulf. Anthropogenic factors, including climate change, will threaten its future suitability, requiring more specific conservation management than currently practiced.

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