I think you might be mistaken.
Not just vertebrates: https://journals.plos.org/plosone/article?id=10.1371/journal...
It's biomass that's decreasing, not just numbers: http://www.climatecentral.org/news/amazon-may-lose-65-percen...
Yes, maritime animals too: https://www.int-res.com/articles/theme/m512p155.pdf
And yes, plant biomass too: http://www.pnas.org/content/115/25/6506 (This one's on a much longer timeline, so hard to compare)