The following is the list of titles in the subsection "Animals" on Essays on Reducing Suffering written by Brian Tomasik. As you can see, Brian has written a lot about how wild animal habitats and biomass are affected by various things.

Food animals

Wild-animal suffering

Insects and other invertebrates

The Importance of Insect Suffering
Do Bugs Feel Pain?
Which Stimuli Are Painful to Invertebrates?
How Good or Bad Is the Life of an Insect? (by Simon Knutsson)
How to Kill Bugs Humanely
Speculations on Invertebrate Population Dynamics Relevant to Reducing Suffering
Convert Grass Lawns to Gravel to Reduce Insect Suffering
How Many Springtails Are Created by a Gram of Grass?
Insect Suffering from Silk, Shellac, Carmine, and Other Insect Products
Water Use Often Kills Zooplankton
How to Avoid Hurting Insects (on wikiHow)

Entomophagy

Welfare biology

Applied Welfare Biology and Why Wild-Animal Advocates Should Focus on Not Spreading Nature
How Does Vegetarianism Impact Wild-Animal Suffering?
Estimating Aggregate Wild-Animal Suffering from Reproductive Age and Births per Female
How Does Killing Animals Affect Total Suffering in a Simple, Food-Limited Population?
Net Primary Productivity by Land Type
How Forest Fires Affect Wild-Animal Suffering
Will Gene Drives Reduce Wild-Animal Suffering?
Habitat Loss, Not Preservation, Generally Reduces Wild-Animal Suffering
Reducing Bug Suffering (video presentation)
Cost-Effectiveness Comparison for Different Ways to Reduce Insect Suffering
Efforts to Help Wild Animals Should Be Effective, Not Idealistic
How Eutrophication Affects Freshwater Invertebrate Populations

Numbers of wild animals

How Many Wild Animals Are There?
Abundances of Soil Organisms
Zooplankton Densities in Lakes and Reservoirs
Zooplankton Densities in Rivers

Humanity's impact on wild-animal abundance

Humanity's Net Impact on Wild-Animal Suffering
Humanity's Impact on the Aggregate Metabolism of Land Wild Animals: An Analysis of Krausmann et al. (2013)
Does the Against Malaria Foundation Reduce Invertebrate Suffering?

Crop cultivation

Fishing

Cattle grazing

Climate change

Food scraps

Wastewater