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< p > < a href = " https://www.bbc.co.uk/bitesize " rel = " nofollow noreferrer " > BBC一口体积< / > < em >定义主要消费者< / em >以下,这意味着(如果我解释这个正确)这个术语包括<强> < /强>动物饲料的主要生产商——植物:< / p > < blockquote > < p >这是指生物体吃生产者。<强>大多数食草动物。< /强> < / p > < /引用> < p >然而,这是反驳的< a href = " https://www.nationalgeographic.org/encyclopedia/consumers/: % 7 e:文本主要= % 20消费者% 20使% 20 % 20 % 20秒% 20营养% 20。% 20他们% 20 % 20也% 20名为% 20食草动物。”rel = " nofollow noreferrer " >国家地理学会< / >将它定义为:< / p > < blockquote > < p >主要消费者构成第二营养级。< >强又被称为食草动物< / >强。< / p > < /引用> <人力资源/ > < p >这是吗?主要消费者<强>只< /强>食草动物,还是/这个词可以包括任何动物饲料的主要生产商在食物链中我们看? < / p >

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< p >不总是正确的。一个很好的例子是周围的食物网< a href = " https://oceanservice.noaa.gov/facts/vents.html " rel = " nofollow noreferrer " >深海热液喷口< / >。在排气系统中,细菌利用硫化氢的化学能量产生糖没有任何阳光(没有光合作用)。然后,一些动物(如浮游动物)在发泄捕食细菌(主要消费者),而其他饲料的主要消费者(二级消费者)。< a href = " http://www.forsea.org/wp-content/uploads/2019/08/F9U510TGST.pdf " rel = " nofollow noreferrer " >这是一个例子活动触及这个食物网。< / > < a href = " https://i.stack.imgur.com/JXrEj.jpg " rel = " nofollow noreferrer " > < img src = " https://i.stack.imgur.com/JXrEj.jpg " alt = "为热液喷口食物网" / > < / >来源:< a href = " https://prezi.com/enzc3iqcvizk/hydrothermal-vent-ecosystem/ " rel = " nofollow noreferrer " > https://prezi.com/enzc3iqcvizk/hydrothermal-vent-ecosystem/ < / > < / p > < p >添加一些关于主要的消费者是任何以生产者为食的生物。分类消费者的想法有点假。生产商是分类清晰,因为你可以清楚地看到光合作用或化学合成的生物,从那里开始。我们可以看看消费者是基于他们的<跨类= " math-container " > \美元三角洲^ {13}< / span >加元(< a href = " http://en.wikipedia.org/wiki/%CE%9413C " rel =“nofollow”noreferrer >en.wikipedia.org/wiki/%CE%9413C < / >)和<跨类= " math-container " > \美元三角洲^ {15}N $ < / span > (< a href = " http://en.wikipedia.org/wiki/%CE%9415N " rel =“nofollow”noreferrer >en.wikipedia.org/wiki/%CE%9415N < / >)。当你提高营养水平,比例< span class = " math-container " > $ \三角洲^ {13}< / span >和加元<跨类= " math-container " > \美元三角洲^ {15}N < / span >增加美元。 Even for humans, depending on how much meat you eat you get different signals (e.g., pnas.org/content/117/33/20044, Figure 1). In your case, the omnivore will have a signal that includes higher $\delta ^{15}N$ values because of their feeding on other animals and therefore they will be classified as a secondary consumer. In order for omnivores to be classified as a primary consumer, their $\delta ^{15}N$ should be close to the one for producers or better to organisms with a complete "vegetarian" diet. That is not the case for omnivores. In a lot of these cases, there is a gradient of values of $\delta ^{15}N$ depending on the diet of the specific omnivore. In fact, scientists look at the $\delta ^{15}N$ values of different individuals to determine their eating habits and in some cases where in the habitat they are feeding. There is a lot of variability on this depending on organisms and even life stages. Classifying organisms as primary/secondary consumers misses the nuance and oversimplifies the complex food web that we observed in the environment.

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