American crocodile captures in South Florida

The federally threatened American crocodile (Crocodylus acutus) is a
flagship species and ecological indicator of hydrologic restoration in the
Florida Everglades. we conducted a long-term capture-recapture study on
the South Florida population of American crocodiles from 1978 to 2015 to
evaluate the effects of restoration efforts to restore historic hydrologic
conditions. The study produced 10,040 crocodile capture events of 9,865
individuals and more than 90% of captures were of hatchlings. Body
condition and growth rates of crocodiles were highly age-structured with
younger crocodiles presenting with the poorest body condition and highest
growth rates. Average body condition was 2.14±0.35 SD throughout South
Florida. Crocodiles exposed to hypersaline conditions (> 40 psu)
during the dry season maintained lower body condition scores and reduced
growth rate by 13% after one year, by 24% after five years, and by 29%
after ten years. Estimated hatchling survival for the South Florida
population was 25% increasing with ontogeny and reaching near 90% survival
at year six. Hatchling survival was 34% in NE Florida Bay relative to a
69% hatchling survival at Crocodile Lake National Wildlife Refuge and 53%
in Flamingo area of Everglades National Park. Hypersaline conditions
affected survival, growth and body condition and was most pronounced in NE
Florida Bay, where the hydrologic conditions have been most disturbed. The
American crocodile, a long-lived animal, with relatively slow growth rate
provides an excellent model system to measure the effects of altered
hydropatterns in the Everglades landscape.  Restoration efforts
targeted toward returning freshwater flow and salinity targets of <
20 psu  to reflect a more historic state in NE Florida Bay will
ensure improved health of the Everglades and illustrates the need for
continued long-term monitoring projects to assess system-wide success.