Nhiệt độ điều chỉnh phản ứng theo chu kỳ ánh sáng trong sinh sản theo mùa của chim sẻ cây nhiệt đới, Passer montanus

Zeitschrift für vergleichende Physiologie - Tập 204 - Trang 721-735 - 2018
Anand S. Dixit1, Iadalangki Bamon1, Namram S. Singh2
1Department of Zoology, North-Eastern Hill University, Shillong, India
2Department of Zoology, Cotton University, Guwahati, India

Tóm tắt

Chúng tôi đã nghiên cứu tác động của nhiệt độ đến việc điều chỉnh theo chu kỳ ánh sáng trong sinh sản theo mùa và các sự kiện liên quan ở chim sẻ cây nhiệt đới tại Shillong, Ấn Độ. Trong thí nghiệm đầu tiên, một nhóm chim được duy trì trong một chuồng chim ngoài trời nhận điều kiện ánh sáng và nhiệt độ tự nhiên, trong khi nhóm khác được tiếp xúc với chu kỳ ánh sáng tự nhiên và nhiệt độ cố định 17 ± 2 °C trong một chuồng chim ngoài trời kín trong 12 tháng. Mặc dù cả hai giới đạt đỉnh tăng trưởng sinh dục vào cùng một thời điểm (tháng 5) dưới hai điều kiện, sự suy giảm sinh dục và thay lông bị trì hoãn dưới điều kiện nhiệt độ được kiểm soát. Trong thí nghiệm thứ hai, các nhóm chim được tiếp xúc với ba nhiệt độ khác nhau (17, 25 và 30 °C) dưới cả hai độ dài ngày dài (LD-14L:10D) và ngắn (SD-9L:15D) trong 7 tháng. Chim cho thấy sự tăng trưởng sinh dục tương đối nhỏ nhưng có ý nghĩa, sự tối màu của màu mỏ và thay lông chỉ ở 30 °C dưới điều kiện SD. Tuy nhiên, chúng hành xử như thể chúng đang ở trong điều kiện tự nhiên và thể hiện những phản ứng trên một cách đáng kể ở tất cả các nhiệt độ dưới LD. Sự suy giảm sinh dục bị trì hoãn ở nhiệt độ thấp hơn (17 °C), trong khi thay lông bị trì hoãn theo sự gia tăng nhiệt độ (25, 30 °C) dưới LD. Những kết quả này làm rõ rằng nhiệt độ điều chỉnh các phản ứng mùa theo chu kỳ ánh sáng ở chim sẻ cây.

Từ khóa

#chim sẻ cây #điều chỉnh nhiệt độ #sinh sản theo mùa #chu kỳ ánh sáng #Passer montanus

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