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首页> 外文期刊>Journal of Comparative Physiology, B. Biochemical, Systemic, and Environmental Physiology >Membrane-bound intestinal enzymes of passerine birds: dietary and phylogenetic correlates
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Membrane-bound intestinal enzymes of passerine birds: dietary and phylogenetic correlates

机译：雀形目鸟类的膜结合肠酶：饮食和系统发育相关

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摘要

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 (mu mol/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.
机译：鸟类在消化道形态和酶活性方面表现出极大的多样性，这部分与其天然饮食的化学成分有关。但是，尚无研究评估肠上皮细胞消化酶的活性是否与作为连续变量在进化规模上分析的饮食化学组成数据相关。我们使用系统发育显式方法研究了饮食对智利中部16种鸣禽（Passeriformes）中三种消化酶（麦芽糖酶，蔗糖酶和氨基肽酶-N）水解活性的影响。使用常规的最小二乘回归和系统发育独立的对比，这些酶的总活性（μmol/ min）与体重呈正相关。消除质量效应后，我们发现氨基肽酶N和麦芽糖酶的比率与在izz中发现的种子的比率之间存在显着的负相关性，但在控制系统发育后，这种关系不再显着。当我们分析日粮的特定营养含量时，我们发现日粮中的氮百分比与残留的麦芽糖酶活性呈负相关，而与氨肽酶-N /麦芽糖酶之比呈正相关。鉴于生化能力之间存在较大的种间差异，我们得出的结论是，这些差异反映了与每种物种的自然饮食中营养成分相关的遗传决定的进化变化。

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