Movement ecology

Blake, Stephen; Yackulic, Charles B.; Cabrera, Freddy; Deem, Sharon L.; Ellis-Soto, Diego; Gibbs, James P.; Kümmeth, Franz; Wikelski, Martin; Bastille‐Rousseau, Guillaume

doi:10.1016/b978-0-12-817554-5.00018-6

Cited by 7 publications

(13 citation statements)

References 71 publications

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“…C. hoodensis tends to be sedentary or nomadic (Bastille‐Rousseau et al., 2017), especially during the dry season when they rely on Opuntia cacti for shade (Blake et al., 2021). During the rainy season, tortoises are less restricted to areas where shade is available and can wander for several weeks to forage (Blake et al., 2021). Since the median step length was approximately 10 m and was below the GPS error for the device (Bastille‐Rousseau, unpublished), we used a cell resolution of 20 m, which corresponded roughly to the device error.…”

Section: Methodsmentioning

confidence: 99%

“…We applied the approach to four different systems and performed The island hosts a homogeneous distribution of herbaceous plants of the arid zone, but large, arboreal Opuntia cacti are found near the central region of the island (Gibbs et al, 2014). C. hoodensis tends to be sedentary or nomadic (Bastille-Rousseau et al, 2017), especially during the dry season when they rely on Opuntia cacti for shade (Blake et al, 2021). During the rainy season, tortoises are less restricted to areas where shade is available and can wander for several weeks to forage (Blake et al, 2021).…”

Section: Applicationsmentioning

confidence: 99%

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A multi‐property assessment of intensity of use provides a functional understanding of animal movement

Bastille‐Rousseau,

Crews,

Donovan

et al. 2023

Methods Ecol Evol

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The intensity of use of a location is one of the most studied properties of animal movement, yet movement analyses generally focus on the overall use of a location without much consideration of how patterns in intensity of use emerge. Extracting properties related to intensity of use, such as the number of visits, the average and variation in time spent and the average and variation in time between visits, could help provide a more mechanistic understanding of how animals use landscape. Combining and synthesizing these properties into a single spatial representation could inform the role that a location plays for an animal. We developed an R package named ‘UseScape’ that allows the extraction of these metrics and then clustered them using mixture modelling to create a spatial representation of the type of use an animal makes of the landscape. We illustrate applications of the approach using datasets of animal movement from four taxa and highlight species‐specific and cross‐species insights. Our framework highlights properties that functionally differ in how animals use them, contrasting, for example, heavily used locations that emerge because they are frequented for long durations, locations that are repeatedly and regularly visited for shorter durations of time or locations visited irregularly. We found that species generally had similar types of use, such as typical low, mid and high use, but there were also species‐specific clusters that would have been ignored when only focusing on the overall intensity of use. Our multi‐system comparison highlighted how the framework provided novel insights that would not have been directly obtainable by currently available approaches. By making the framework available as an R package, these analyses can be easily applicable to a myriad of systems where relocation data are available. Movement ecology as a field can strongly benefit from approaches that not just describe patterns in space use, but also highlight the behavioural mechanisms leading to these emerging patterns.

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Section: Methodsmentioning

confidence: 99%

Section: Applicationsmentioning

confidence: 99%

A multi‐property assessment of intensity of use provides a functional understanding of animal movement

Bastille‐Rousseau,

Crews,

Donovan

et al. 2023

Methods Ecol Evol

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“…Conversely, body condition may be shaped by eel movement frequency, as eels in habitats with reduced connectivity and movement opportunities have been found to have lower body condition (Lasne et al 2008). Body condition may be a more relevant driver of movement to specific life stages, and may define migration or dispersal ability (Hays et al 2016;Goossens et al 2020;Blake et al 2021). Routine inclusion of body condition as an intrinsic variable within future studies will help elucidate this.…”

Section: Body Conditionmentioning

confidence: 99%

The drivers of anguillid eel movement in lentic water bodies: a systematic map

Williamson

Jacoby

Piper

2023

Rev Fish Biol Fisheries

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Anguillid eels are near globally distributed catadromous fishes with marine spawning areas and inshore and inland growth areas in both lotic (rivers, estuaries) and lentic (lakes, ponds, lagoons) water bodies. As predators, anguillid eels play an important ecological role in both marine and freshwater systems, and several species are harvested commercially for food. However, some of the more widely distributed species have undergone severe declines in recruitment and their population status is now of significant concern. Given the multiple and lengthy migrations undertaken by anguillid eels, understanding of the drivers of movement is fundamental for species conservation and management. Yet, despite the importance of lentic systems to their ecology, most studies on anguillid eel movement have been conducted in lotic systems. Given that key influences on eel migration in lotic water bodies, such as fluctuations in flow and water temperature, may be minimised in lentic environments, the transferability of findings between lotic and lentic systems cannot be assumed. A systematic map was constructed to synthesise current knowledge on the extrinsic and intrinsic drivers of anguillid eel movement in lentic systems. The current state of knowledge of the drivers of eel movement in lentic systems is presented and compared to the relatively well-understood drivers of movement in lotic systems. We also discuss current knowledge gaps and limitations, and identify key future research requirements to inform the management and conservation of anguillid eels in understudied lentic systems. Graphical abstract

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“…The Galapagos archipelago lies ca. 1000 km west of continental Juvenile tortoises were located within each of the three nesting zones by either radio telemetry (n = 15) of tagged animals as part of an ongoing study (Blake, Yackulic, et al, 2020) or opportunistically (n = 25) via searches on foot conducted between July 4 and 13, 2017. For each juvenile tortoise sampled, we obtained capture location using GPS, placed it in a clean cotton bag and carried it to a field laboratory where coelioscopy was carried out.…”

Section: Study Sitementioning

confidence: 99%

“…In the Tortoise Reserve on Santa Cruz Island at least six tortoise nesting areas are known to rangers from the Galapagos National Park Service. Within one of these areas, El Chato, three distinct nesting zones occur along an elevational gradient between 10 and 140 m ASL (Figure 2 ), which are included in a long‐term study on Galapagos tortoise movement ecology (Blake et al, 2013 ; Blake, Yackulic, et al, 2020 ). Application of a thermal model developed by Blake, Parlin, et al ( 2020 ) indicates a ca.…”

Section: Introductionmentioning

confidence: 99%