SHARKS MOST ACTIVE IN WATER TEMPERATURES 22ºC / 71ºF

SHARKS MOST ACTIVE IN WATER TEMPERATURES 22ºC / 71ºF

May 11, 2018 0 Comments

SHARKS MOST ACTIVE IN WATER TEMPERATURES 22ºC / 71ºF

Abstract

The redistribution of species has emerged as one of the most pervasive impacts of anthropogenic climate warming, and presents many societal challenges. Understanding how temperature regulates species distributions is particularly important for mobile marine fauna such as sharks given their seemingly rapid responses to warming, and the socio‐political implications of human encounters with some dangerous species. The predictability of species distributions can potentially be improved by accounting for temperature's influence on performance, an elusive relationship for most large animals. We combined multi‐decadal catch data and bio‐logging to show that coastal abundance and swimming performance of tiger sharks Galeocerdo cuvier are both highest at ~22°C, suggesting thermal constraints on performance may regulate this species' distribution. Tiger sharks are responsible for a large proportion of shark bites on humans, and a focus of controversial control measures in several countries. The combination of distribution and performance data moves towards a mechanistic understanding of tiger shark's thermal niche, and delivers a simple yet powerful indicator for predicting the location and timing of their occurrences throughout coastlines. For example, tiger sharks are mostly caught at Australia's popular New South Wales beaches (i.e. near Sydney) in the warmest months, but our data suggest similar abundances will occur in winter and summer if annual sea surface temperatures increase by a further 1–2°C. For full study go to Global Change Biology.

 

Authors: 




Also in OMNA NEWS

Study finds OMNA Marine Tourniquet (OMT) Occlusion and Completion Pressures Better than CAT Tourniquet Gen 7
Study finds OMNA Marine Tourniquet (OMT) Occlusion and Completion Pressures Better than CAT Tourniquet Gen 7

October 14, 2020 0 Comments

Read More

Journal Special Operations Medicine JSOM OMNA Marine Tourniquet Study Stop The Bleed TCCC TECC
Journal Special Operations Medicine - OMNA Marine Tourniquet Study

September 26, 2020 0 Comments

Read More

How To Survive A Shark Attack With An OMNA Tourniquet Surfboard Leash
How To Survive A Shark Attack With An OMNA Tourniquet Surfboard Leash

July 07, 2019 0 Comments

August 2015: This video shows the prototype version of the OMNA Tourniquet Surfboard Leash. The collapsable windlass was inferior in the water so it was replaced with a marine ratcheting buckle, which can be seen at www.omnainc.com

Read More