As with many other subjects Earth Science and, perhaps particularly, Physical Geography overlaps with many other disciplines. In my department we have a strong group of Landscape ecologists that study the geography of ecology (i.e. plant dispersal, historical changes in the landscapes (ecology) to mention a couple). There will be many such mixes in our subjects. An emerging topic is also research on resilience which is truly inter-disciplinary but which has a very strong base in Earth/environmental science. In glaciology we work with numerical ice sheet models and so one could easily dismiss some of that as as math/numerics. One could also see that there are legal or political aspects to environmental questions in areas where one could place questions as pure law or political science but where the questions are strongly linked and must be handled in a cross-disciplinary way. In general, cross- or interdisciplinary questions are hard to categorize and are very likely to be fended off from all sites. So I think being inclusive will be an advantage, however, I do not say judging this is easy.
So it will be a challenge to discern how ecological questions are related to Earth Science but if geographical aspects are involved, they definitely are. It would also be simple to ask the OP to clarify how their question relates to Earth Science just like we do with many other questions.