Membrane-bound intestinal enzymes of passerine birds: dietary and phylogenetic correlates
Membrane-bound intestinal enzymes of passerine birds: dietary and phylogenetic correlates
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雀形目鸟类的膜结合肠道酶：饮食和系统发育的相关性
DOI：
10.1007/s00360-011-0557-3
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
P. Sabat
中科院分区：
文献类型：
--
作者：
Natalia Ramírez;C. Narváez;P. Sabat
鸟类在消化道形态和酶活性方面表现出巨大的多样性，这在一定程度上与其天然饮食的化学成分相关。然而，没有研究评估肠上皮细胞消化酶的活性是否与在进化尺度上作为连续变量分析的膳食化学成分数据相关。我们使用系统发育明确的方法来研究饮食对智利中部 16 种鸣禽（雀形目）三种消化酶（麦芽糖酶、蔗糖酶和氨肽酶-N）水解活性的影响。使用传统的最小二乘回归和系统发育独立对比，这些酶的总活性（μmol/分钟）与体重呈正相关。消除质量效应后，我们发现氨肽酶-N和麦芽糖酶的比率与砂囊中发现的种子比例之间存在显着的负相关，但在控制系统发育后，这种关系不再显着。当我们分析日粮的具体营养成分时，我们发现日粮中氮的百分比与残留麦芽糖酶活性呈负相关，与氨肽酶-N/麦芽糖酶的比值呈正相关。鉴于生化能力存在巨大的种间差异，我们得出的结论是，这些差异反映了与每个物种自然饮食的营养成分相关的遗传决定的进化变化。
Bird species exhibit great diversity in digestive tract morphology and enzymatic activity that is partly correlated with the chemical composition of their natural diets. However, no studies have assessed whether the activities of digestive enzymes of the enterocytes correlate with dietary chemical composition data analyzed as a continuous variable at an evolutionary scale. We used a phylogenetically explicit approach to examine the effect of diet on the hydrolytic activity of three digestive enzymes (maltase, sucrase, and aminopeptidase-N) in 16 species of songbirds (Order Passeriformes) from Central Chile. The total activities (μmol/min) of these enzymes were positively associated with body mass using both conventional least squares regressions and phylogenetically independent contrasts. After removing mass effects, we found a significant negative correlation between the ratio of aminopeptidase-N and maltase to the proportion of seeds found in the gizzard, but this relationship was no longer significant after controlling for phylogeny. When we analyzed the specific nutritional content of the diet, we found that the percentage of nitrogen in diet was negatively correlated with residual maltase activity and positively correlated with the ratio aminopeptidase-N/maltase. Given the large interspecific differences in biochemical capacity, we conclude that these differences reflect genetically determined evolutionary changes associated with the nutrient contents of each species’ natural diet.
对摄食行为的生理限制：八哥的肠膜双糖酶。
DOI：
10.1126/science.2916126
发表时间：
1989
期刊：
Science (New York, N.Y.)
影响因子：
--
作者：
MartinezdelRio,C;Stevens,BR
通讯作者：
Stevens,BR