SORU: aşağıdaki parçaya göre cevaplayınız
It is mentioned in the passage that ----.
Scientists were initially unconvinced that the decrease
in the number of amphibians – animals such as frogs
that live on land and in water – was real, because
amphibian populations are notorious for fluctuating
widely. However, after statistical evidence showed that
the declines were far more widespread than would
reasonably be expected by chance, most researchers
agreed that something was seriously wrong. Reports of
declines and extinctions accelerated during the 1990s,
and the observations indicated that something specific
and troubling was happening to amphibians. At one
locale in Costa Rica, 40 per cent of the local amphibian
species disappeared over a short period. The loss of
amphibian species not only contributes to the world’s
biodiversity crisis but also has remarkable implications
for the ecosystems where the declines occur. Without
amphibians, links to food webs are broken, and other
organisms suffer in often unpredictable ways. Although
some of the earliest amphibian declines were recorded
in the US, much of the scientific literature focuses on
decreases in tropical countries, where losses have
often been more dramatic and have involved a larger
number of species. This has led to the curious problem
of declines in temperate amphibian species receiving
insufficient attention.