Over the last few decades, measurements of light stable isotope ratios have been increasingly used to answer questions across physiology, biology, ecology, and archaeology. The vast majority analyse carbon (δ13C) nitrogen (δ15N) isotopes as 'default' isotopes, omitting sulfur (δ34S) due time, cost, or perceived lack benefits instrumentation capabilities. Using just isotopic can produce results that are inconclusive, uncertain, in worst cases, even misleading, especially for scientists new...

In the face of accelerating climate change, conservation strategies will need to consider how marine animals deal with forecast environmental change as well ongoing threats. We used 10 yr (2009-2018) data from commercial fisheries and a bather protection program along coast New South Wales (NSW), southeastern Australia, investigate (1) spatial temporal patterns occurrence in bull sharks (2) factors affecting shark NSW. Predicted future distribution for this species was modelled strengthening...

Globally, marine animal distributions are shifting in response to a changing climate. These shifts usually considered at the species level, but individuals likely differ how they respond conditions. Here, we investigate movement behaviour and, therefore, redistribution, would by sex and maturation class wide-ranging predator. We tracked 115 tiger sharks (Galeocerdo cuvier) from 2002 2020 forecast class-specific through 2030, including environmental factors predicted occurrence of potential...

Abstract For similar species to co‐occur in places where resources are limited, they need adopt strategies that partition reduce competition. Our understanding of the mechanisms behind resource partitioning among sympatric marine predators is evolving, but we lack a clear how environmental change impacting these dynamics. We investigated spatial and trophic three seabirds with contrasting biological characteristics: greater crested terns Thalasseus bergii (efficient flyer, limited diver,...

Abstract Acoustic telemetry enables spatial ecologists to collect movement data from a variety of aquatic species. In estuaries and rivers, accounting for the complex shape water bodies is challenging. Current methods analysing utilization distributions (UDs) are restricted using locations receivers where animals have been detected, which limits information available estimate paths. We present new r package (RSP—Refined Shortest Paths) movements tracked with acoustic transmitters in...

The present study aims at inferring linkages between the abundance of potentially dangerous sharks (PDSs) and shark hazard, so as to derive information about underlying processes peril off Recife, Brazil. Fishery-independent longline drumline data collected from May 2004 through December 2014 for Carcharhinus leucas Galeocerdo cuvier measuring ≥109cm were considered analysis. Generalised additive models showed that frequency bites was directly proportional followed same seasonal trends PDS...

Throughout evolutionary history, elasmobranchs have developed diverse reproductive strategies. Little focused work, however, has addressed how neonatal nutritional state is affected by differing degrees of maternal investment associated with these markedly different To investigate the effect on quality pups during early life history an extremely viviparous elasmobranch, quantitative biomarker analysis including lipids, fatty acids and stable isotopes was conducted. Using cownose ray...

Abstract Spawning is a key life history event for aquatic species that can be triggered by environmental signals. For estuarine-dependent species, the timing of such triggers important determining future patterns in recruitment. Here, we used acoustic telemetry to identify potential drivers spawning migration female Giant Mud Crabs ( Scylla serrata ). Eighty-nine mature crabs were tagged two subtropical south-east Australian estuaries, Clarence River (~ 29.4°S) and Kalang 30.5°S), during...

ABSTRACT A robust understanding of habitat usage by coastal shark species, and how it overlaps with human presence in densely-populated regions is needed to inform the development efficient conservation strategies for these important top predators. An intensive longline survey conducted nearshore waters off northeastern Brazil from 2004 through 2014 caught a total 18 bull sharks (Carcharhinus leucas) (male-female ratio = 0.63:1), which can be dangerous humans. Although most were sexually...

Conservation measures often result in a “wicked problem,” i.e., complex problem with conflicting aims and no clear or straightforward resolution without severe adverse effects on one more parties. Here we discuss novel approach to an ongoing problem, which actions reduce risk humans, involve lethal control of otherwise protected species. To protect water users, nets are used catch potentially dangerous sharks at popular bathing beaches, yet Australian waters the targeted species, white shark...

Abstract Greater Sydney is the largest coastal city in Australia and where bull sharks ( Carcharhinus leucas ) are present every summer autumn. A decade of acoustic telemetry data was used to identify drivers space use for their potential prey, according standardised 6-h intervals using dynamic Brownian bridge movement models. Influences environmental, physical, biological variables on areas use, location, predator–prey co-occurrence were investigated with generalised additive mixed Rainfall...

Unprovoked shark bites have increased over the last three decades, yet they are still relatively rare. Bull sharks globally distributed throughout rivers, estuaries, nearshore areas and continental shelf waters, capable of making long distance movements between tropical temperate regions. As this species is implicated in their range, knowledge environmental drivers bull important for better predicting likelihood occurrence at ocean beaches potentially assist reducing bites. Using largest...

Abstract The yellowfin tuna is a very abundant tropical species in the western equatorial Atlantic Ocean and an important fishery resource for Brazilian fleet. In this study we performed stable isotope analysis to better understand spatial trophodynamics dietary changes around two insular marine protected areas Brazil. A total of 65 specimens measuring between 47 138 cm LT (total length) were sampled archipelagos Fernando de Noronha (FNA; n = 34) Saint Peter Paul (SPSPA; 31) July 2018...

While wildlife tourism may impact the animals it targets, plays a critical role in public education and conservation awareness. Understanding changes animal behaviour response to activities can inform trade-offs between negative impacts socioeconomic benefits. There are claims that cage-diving condition white sharks, Carcharodon carcharias, interact with boats, potentially increasing risk of shark bites. We tracked fine-scale movements 73 sharks relation boats using acoustic telemetry 2018...

Physiological adaptations have evolved to help sharks face rapid periods of feast. Tiger are generalist apex predators that rely on a high-lipid/protein diet. To achieve satisfactory nutritional condition, proper lipid absorption and hepatic storage needed. Bile secretion in is low sporadic but increases during short fasting. The present study describes physiological impairment caused by bile accumulation juvenile tiger sharks, possibly due prolonged These evidences suggest that, even though...

Understanding the movement ecology of marine species and connectivity populations is required for effective fisheries management. This especially case with wide-ranging distributions which can span across several jurisdictions different management regulations. We used Australian national network acoustic receivers facilitated by Integrated Marine Observing System (IMOS) to describe extent frequency movements two large epipelagic shark species, bronze whaler ( Carcharhinus brachyurus ) dusky...

Abstract Understanding the main factors that regulate species composition in fisheries is of utmost importance for developing efficient management strategies, particularly under scope ecosystem‐based conservation approaches. This study used multivariate statistics to analyze catch data collected during a ~10‐year, fishery‐independent, standardized longline survey conducted coastal waters (<20‐m isobaths) off Recife, northeastern Brazil. A redundancy analysis (RDA) was performed assess...