We excluded studies from outside temperate regions and those with predation rate estimates based on fewer than 10 cats
External factor that could have ben very detrimental -- important to address animal behavior
20 Matching Annotations
- Sep 2023
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www.nature.com www.nature.com
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We defined owned cats to include owned cats in both rural and urban areas that spend at least some time indoors and are also granted outdoor access. We defined un-owned cats to include all un-owned cats that spend all of their time outdoors.
Definitions -- good to use for presentation
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his mortality is of particular concern within the context of steadily increasing populations of owned cats, the potential for increasing populations of un-owned cats12, and an increasing abundance of direct and indirect mortality sources that threaten wildlife in the United States and globally.
Could be difficult to monitor as well because how can you tell if it's un-owned or owned? It's also so easy for a owned cat to run away and become a part of this system
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We provide evidence of large-scale cat predation impacts based on systematic analysis of multiple data sources. F
Call to action
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Population size estimates can be improved by incorporating observations of free-ranging cats into a wildlife mortality reporting database23.
Good use of citizen data maybe? iNaturalist could help
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o precise estimate of the un-owned cat population exists for the United States because obtaining such an estimate is cost prohibitive
Difficult to count -- ways to find approximate populations can help with doing the same in Africa with hippos and elephants etc
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However, studies of mammals in suburban and rural areas found that 75–100% of mammalian prey were native mice, shrews, voles, squirrels and rabbits26,30,31
What other effects are there on the ecological systems? How will these change the ecosystems? Similar to compare to the gecko scenarios
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Native species make up the majority of the birds preyed upon by cats.
!! This is an important comparisons to look at the argument of other invasive species vs native species
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This estimated level of mortality could exceed any other direct source of anthropogenic mortality for small mammals;
Huge impact -- this needs to be addressed as quickly as possible
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Systematic reviews like ours, which includes protocol formulation, a data search strategy, data inclusion criteria, data extraction and formal quantitative analyses22, are scarce for other anthropogenic mortality sources
Highly systematic with many data tools -- good to prove credibility and have high replicability
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far exceeds any previously estimated US figure for cats
Either a) this is indicative of a problem that no one has realized the extent of as of yet, or b) there could be discrepancies based on the variation discussed in the previous paragraph
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wild cat
What is the difference between wild cats and domestic cats in terms of predation? Why are domestic cats such a threat? Do wild cats pose as much of a threat? Something to keep in mind for further research
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89% of this mortality caused by un-owned cats
is this inclusive of all mammals? is this actually the figure? that's such a large percentage
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For birds, we generated three US mortality estimates based on predation data from studies in: (1) the United States, (2) the United States and Europe and (3) the United States, Europe, and other temperate regions (primarily Australia and New Zealand).
Different means by which they compare data -- good to know and shows an intensive amount of thought and detail
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a priori in
this is theoretical deduction rather than observation
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1.3–4.0 billion birds and 6.3–22.3
Beginning estimate -- good to keep in mind to compare to results
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data-driven systematic review of studies that estimate predation rates of owned and un-owned cats, and estimated the magnitude of bird and mammal mortality caused by all cats across the contiguous United States
This is the object of study and way in which they're doing it
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policies for management of free-ranging cat populations and regulation of pet ownership behaviours are dictated by animal welfare issues rather than ecological impacts
Why are they not focusing on ecological impacts? It's a trickle-down system where there are going to be ecological consequences
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ikely the single greatest source of anthropogenic mortality for US birds and mammals
Huge impact, had no idea of this before
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Here we conduct a systematic review and quantitatively estimate mortality caused by cats in the United States.
Giving an actual number to the speculation
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