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Kittens: They grow up faster than you think. |
The short answer: we don’t know.
The slightly longer answer: yesterday Kristina Vesk, CEO of
the Cat Protection Society (CPS), and I were interviewed on ABC News 24 by KumiTaguchi about a reported association between an increase in temperatures during
the winter months and an increase in the intake of kittens by the CPS.
Traditionally there was a distinct “kitten season”, usually spring, but CPS has
noted a trend in its data saying that “season” is much longer in years where
winter temperatures are warmer. Which is a problem, because already there are too many cats without homes.
As CPS acknowledge, there are limitations with this data. This
is a trend, and does not prove that climate change means more kittens. In fact,
adverse weather events may increase kitten mortality, particularly neonates that
have less ability to thermoregulate. In Sydney, for example, minor flooding is
common. Many litters are born in drains and in heavy rain they may perish. We
don’t really know, as CPS CEO Kristina Vesk pointed out, there is no census of
homeless cats and kittens (despite the fact that cats and kittens continue to
rule the internet, they have not yet mastered its use). We also don't know how well an increase in admissions to CPS correlates with overall cat population numbers. It may be in fact that during those years where spikes were recorded, there was a spike in good samaritans. The data has not yet
been subjected to statistical analysis, although the hypothesis that climate change alters reproductive rate is biologically plausible.
What we do know is that changes in climate and photoperiod
can impact on feline reproduction, although no one fully understands exactly how. We
also know that there are too many cats killed in Australian shelters because
they cannot find homes. To this end, early-age desexing and the practice of
adopting cats and kittens from shelters are more likely to impact feline
numbers than any interventions directed at climate change, even if a link is
proven. Some owners still don’t realise that cats can become sexually active
early in life, and that the gestation period is only around two months. One
female cat can produce dozens of kittens in her lifetime.
It is, however, worth considering how climate change impacts
animals more broadly. The Australian Veterinary Association has a draft policy
on Climate Change and Animal Health, Welfare and Production (published in the
January/Feburary 2016 AustralianVeterinary Journal). AVA members are invited to comment on the policy by
March 25. Significantly, it states that the AVA “supports the science of
climate change and accepts that human activity is contributing to climate
change”. The policy acknowledges that there is more scope for veterinarians to
support and participate on research on the impact of climate change on animal
health, welfare and production.
Key areas where animals are impacted by climate change
include:
- Changes in the habitat of native fauna
- Changes in the epidemiology and distribution of vector-borne diseases (in small animals this includes diseases like heartworm (dogs and cats) and calicivirus (rabbits), which are spread by mosquitoes).
- Changes in the potential for spread of arboviruses and henipahviruses
- Pasture growth and nutrition
All of the above changes will also impact human health and
well-being.
At a practice level we’ve seen the loss of a distinct “tick
season”, with paralysis ticks – traditionally favouring the warm months – being
found on dogs and cats even in winter. In addition, we’ve seen and heard of a
lot more cases of heat stress in animals in the Sydney area. It is hard for
owners to plan for marked and unpredictable variations in temperature. Watch
this space.
If, in the meantime, you're teetering on the brink of adopting a cat, this post may just tip you over.