小軻 發問時間: 社會與文化語言 · 1 0 年前

動物原文期刊翻譯<急>part9

Holomuzki (1997) found that

algae in the alimentary canals of stream-dwelling

Bufo americanus (Bufonidae) tadpoles in the US

were mostly diatoms, with only small amounts

of green and blue-green algae. The dominant

diatoms were Achnanthes (> 65%) with the most

dominant species being A. minutissima. Peterson

and Boulton (1999) examined the excrement of

Limnodynastes tasmaniensis (Leptodactylidae)

tadpoles in Australian streams and found that

diatoms were the most commonly eaten type of

food. The similarity in tadpole diets in subtropical

and temperature streams may be because 1) algae

are the predominant primary producers in streams,

regardless of region, 2) diatoms are typically the

dominant algal group (Shortreed and Stockner

1983, Stevenson 1996, Lam and Lei 1999), or 3)

diatoms contain more calories (in the form of fat

and protein) than other algae and hence they are a

preferred food (Kupferberg 1997b).

In contrast, the food sources for tadpoles in

lentic habitats are more diverse, typically including

Euglenophyta, Pyrrophyta, Cryptophyta, and

Chromophyta (Diaz-Paniagua 1989, Johnson

1991, Bradsley and Beebee 1998, Eterovick 2000).

The proportion of algae consumed varies among

tadpole species; some feed primarily on diatoms

(B. americanus in the US; Holomuzki 1997, Acris

crepitans in the US; Johnson 1991, B. crucifer

in Brazil; Eterovick 2000), while others fed on

green algae (Pelodytes punctatus in Spain; Diaz-

Paniagua 1989) or a mixture of diatoms and green

algae (B. bufo and B. calamita in the UK; Bradsley

and Beebee 1998). These differences might

reflect the fact that lentic tadpoles not only graze

on the substrate, but also filter algae suspended in

the water column (Hoff et al. 1999).

McCann and

Test (1976) observed that B. americanus tadpoles

shifted feeding mode from grazing to filtering as

suspended algae increased. Other lentic tadpoles

may also shift their mode of feeding depending on

food availability and the distribution of food within a

habitat, resulting in variations in tadpole diets.

2 個解答

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  • EMED
    Lv 7
    1 0 年前
    最佳解答

    Holomuzki (1997)發現在美國蟾蜍蝌蚪(蟾蜍科)消化道中的海藻裡,最多的是矽藻和一點點綠及藍綠藻. 佔優勢的矽藻為曲殼藻屬(> 65%) 和最多數的矽藻品種是 A. minutissima. Peterson and Boulton (1999) 實驗澳洲河流Limnodynastes tasmaniensis (細趾蟾科) 蝌蚪的排泄物,和發現and found that 矽藻是最常被吃的食物. 在亞熱帶及溫帶河流蝌蚪的飲食是相似的,可能因為 1)海藻在河流中是佔優勢的主要生產者,不管在任何地區, 2)矽藻是典型的優勢海藻群 (Shortreed and Stockner 1983, Stevenson 1996, Lam and Lei 1999), 或 3)矽藻比其他海藻含更多卡路里 (構成脂肪及蛋白質) 因此他們成為較好的食物(Kupferberg 1997b).

    相較之下,蝌蚪食物來源在靜水棲息地會更不同, 典型地包含裸藻門植物, 渦鞭毛藻, 隱藻,及雜色藻門(Diaz-Paniagua 1989, Johnson 1991, Bradsley and Beebee 1998, Eterovick 2000). 海藻被吃的比例在蝌蚪種類中發生變化;一些主要吃矽藻(B. americanus in the US; Holomuzki 1997, Acris crepitans in the US; Johnson 1991, B. crucifer in Brazil; Eterovick 2000), 當其他吃綠藻(Pelodytes punctatus in Spain; Diaz- Paniagua 1989)或混合矽藻及綠藻 (B. bufo and B. calamita in the UK; Bradsley and Beebee 1998). 這些不同處可能反應靜水的蝌蚪不只吃基質海藻,也過濾在水柱中的懸浮海藻(Hoff et al. 1999).

    McCann和Test (1976) 觀察到美國東部的蟾蜍( B. americanus)蝌蚪吃過濾增加的海藻懸浮物來改變飲食型態. 其餘淨水蝌蚪也可能依食物的可得性及食物在棲息處的分布來改變飲食型態,結果改變了蝌蚪的飲食.

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  • 5 年前

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