Esta es de una que pregunta por una relación entre distintas especies de aves insectívoras y un tercer agente que les facilita encontrarse la comida. Y cuál es el chiste, pues que es capaz de contar esto haciendo que parezca una ecuación de tercer grado:
La pregunta:
Which animal/bird/insect best describes such situation?
- X is looking for Y.
- Z is also looking for Y.
And
- W makes Y available to both X and Z.
I am looking for a name of animal/bird/insect who are facing such situation in their food chain. It would be great if someone provide names of W,X,Y and Z.
- Z is also looking for Y.
And
- W makes Y available to both X and Z.
I am looking for a name of animal/bird/insect who are facing such situation in their food chain. It would be great if someone provide names of W,X,Y and Z.
O sea:
[¿Qué animal/ave/insecto describe mejor esta situación?
- X está buscando Y.
- Z está buscando Y, también.
Y
- W hace que Y esté disponible para X y Z, los dos a la vez.
Estoy buscando un nombre para un animal/ave/insecto que se enfrenten a esa situación en su cadena alimentaria. Sería estupendo si alguien proporciona los nombres de W, X, Y y Z. ]
Consideraciones:
1) Quien ha hecho esta pregunta tiene mérito. Los escritores de libros de texto tendrían un filón con él. Imagínate cómo plantearía el muchacho el típico problema de "un tren sale de la estación A a una velocidad de...".
2) Esto de llamar animales sólo a los mamíferos es una cosa muy extendida en inglés. En el contexto de la pregunta recordar "animales = mamíferos".
3) Esta es la típica pregunta que riza el rizo. No le interesa un insectívoro, sino que quiere dos distintos.
4) Vuélvete a leer la pregunta que no te has enterado de nada.
Después de releer la pregunta al menos 3 veces...
La respuesta:
Funny question, it sounds like and algebra problem :). I like it.
[Note: I will answer expecting that your question isn't a homework, because as I have told I find it very interesting. But in case it is, I wouldn't show your teacher these rambling divagations I'm going to write here, teachers frequently expect that the answers are centered on their local area, so...good luck if you use this material...].
[Note 2: I think that in marine habitats this type of situation is more frequent given that there are many more intermediate predators than in terrestrial habitats].
Such as you have posed it, I don't remember any direct example of two different insectivore birds looking for the same kind of insect, and an aditional element (W, you don't specify wether W is a bird, or even an animal) making those insects avalaible to their predators.
But I can tell of some similar situations:
1) W accidentally or as the collateral result of its activities makes some preys accessible to some predators. There are a bunch of situations of this kind occurring in many ecosystems everyday, to tell you about some:
[Note: I will answer expecting that your question isn't a homework, because as I have told I find it very interesting. But in case it is, I wouldn't show your teacher these rambling divagations I'm going to write here, teachers frequently expect that the answers are centered on their local area, so...good luck if you use this material...].
[Note 2: I think that in marine habitats this type of situation is more frequent given that there are many more intermediate predators than in terrestrial habitats].
Such as you have posed it, I don't remember any direct example of two different insectivore birds looking for the same kind of insect, and an aditional element (W, you don't specify wether W is a bird, or even an animal) making those insects avalaible to their predators.
But I can tell of some similar situations:
1) W accidentally or as the collateral result of its activities makes some preys accessible to some predators. There are a bunch of situations of this kind occurring in many ecosystems everyday, to tell you about some:
- W is a maize farmer who uses flood irrigation methods. Y are some different types of flies (Diptera) that lay their eggs in the flooded fields of W. As a result massive quantities of adult flying insects are avalaible for many insectivore birds, migratory ornot, such as sparrows, swifts, swallows, bee-eaters, etc, etc. They are yor X and Z (and the rest of the alphabet, and more :)).
- W
is a bird that accidentally disperses invertebrates out of their
habitats, burrows or even hosts. Thus these inertebrates are made
available for some predators that live/chase well far from those
habitats and biotopes, and that in other case wouldn't have very few
chances of preying on them.
To give them name, W could be piscivorous birds, Y propagulates, and X pelicans.
To give them name, W could be piscivorous birds, Y propagulates, and X pelicans.
There is a very interesting paper about the importance of birds as invertebrates dispersers in arid Australia: Page on ebd.csic.es.
2) W voluntarily tells X and Z the location of Y in order to get access to Y or some products of Y.
Honeyguides are named for a remarkable habit seen in one or two species: they guide humans to bee colonies. Once the hive is open and the honey is taken, the bird feeds on the remaining wax and larvae. This behavior is well studied in the greater honeyguide; some authorities (following Friedmann, 1955) state that it also occurs in the scaly-throated honeyguide, while others disagree (Short and Horne, 2002). Despite popular belief, there is no evidence that honeyguides guide the honey badger.
I give it up to you to name X, Y, Z, W in those cases.
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