Marine Species on the Move

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Biodiversity and Functionality of Aquatic Ecosystems".

Deadline for manuscript submissions: closed (20 February 2021) | Viewed by 9211

Special Issue Editor


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Guest Editor
LGL Ecological Research Associates, USA
Interests: movement ecology; sensory ecology; animal migration; magnetic navigation; marine biology; oceanography

Special Issue Information

Movement characterizes life in marine ecosystems. Currents, tides, and waves keep the ocean’s inhabitants in seemingly constant motion. Long-distance migrations are a common trait, with taxa as diverse as sharks, eels, sea turtles, birds, and whales possessing a suite of adaptations that allow them to swim with remarkable precision between foraging and reproductive areas. No less remarkable are those organisms that travel similar distances without any guidance mechanisms, such as rafts of floating macroalgae and their associated animal communities. These movements have profound implications for ecological and evolutionary processes as well as how humans interact with this environment. Our ability to manage marine ecosystems and predict responses to environmental and anthropogenic changes is limited in large part by a lack of understanding of the mechanisms of marine organismal movement. This Special Issue, “Marine Species on the Move”, will coalesce research on the mechanisms of marine species movement (e.g., fluid dynamics, biomechanics, physiology, sensory biology, and species interactions) and  the implications of those movements (e.g., biogeographic patterns, genetic structure of populations, population dynamics, fisheries management, and conservation).

Papers on all taxa and all approaches for studying organismal movements and the implications of those movements will be considered. Papers investigating ocean dynamics and the changing conditions marine organisms experience (at any range of temporal and spatial scale) are particularly welcome. Article types for this issue may include research articles, reviews, methods papers, meta-analyses, and perspective pieces.

Dr. Nathan F. Putman
Guest Editor

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Water is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Movement ecology
  • Migration
  • Community ecology
  • Conservation biology
  • Ecosystem models
  • Fisheries management
  • Physical oceanography
  • Remote sensing
  • Telemetry

Published Papers (3 papers)

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Research

18 pages, 1351 KiB  
Article
Distance Estimation in Reproduction Tasks in a Harbor Seal (Phoca vitulina)
by Eric Maaß and Frederike D. Hanke
Water 2021, 13(7), 938; https://doi.org/10.3390/w13070938 - 30 Mar 2021
Cited by 6 | Viewed by 2493
Abstract
Harbor seals commute between haul-out places and feeding grounds close to the shore or in the open ocean, which is considered a low structured environment, at first sight not providing many cues for orientation/navigation. Nevertheless, seals are well-oriented. For returning to a specific [...] Read more.
Harbor seals commute between haul-out places and feeding grounds close to the shore or in the open ocean, which is considered a low structured environment, at first sight not providing many cues for orientation/navigation. Nevertheless, seals are well-oriented. For returning to a specific location, seals may use both external and internal cues to, for example, perform path integration requiring the integration of distances traveled and angles steered. We herein assessed the seal’s ability to estimate distances, previously swum or unknown, in reproduction tasks. Reproduction tasks refer to an experimental paradigm in which the experimental animal is required to swim a specific distance first and subsequently reproduce this distance, with visual cues present or absent. The seal was able to estimate and then reproduce distances (0.5–18.5 m) with the smallest error below 10% of the actual distance, and its precision was higher with distances repeatedly swum compared to its performance with unfamiliar distances. In the absence of visual cues, the seal’s performance slightly dropped; however, it was still able to perform the task with an error of 21%. In conclusion, distance estimation may help seals to navigate precisely towards their goals, even if, for example, visual information is not available. Full article
(This article belongs to the Special Issue Marine Species on the Move)
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20 pages, 4815 KiB  
Article
A Global Assessment of the Potential for Ocean-Driven Transport in Hatchling Sea Turtles
by Morgan J. DuBois, Nathan F. Putman and Susan E. Piacenza
Water 2021, 13(6), 757; https://doi.org/10.3390/w13060757 - 11 Mar 2021
Cited by 5 | Viewed by 3192
Abstract
Ocean circulation models are an essential tool for use in estimating the movements of drifting marine species. Across the world, hatchling sea turtle transport to the pelagic ocean is facilitated by the local currents off their natal beaches. It is difficult, if not [...] Read more.
Ocean circulation models are an essential tool for use in estimating the movements of drifting marine species. Across the world, hatchling sea turtle transport to the pelagic ocean is facilitated by the local currents off their natal beaches. It is difficult, if not impossible, to observe this transport reliably for any lengthy period, and, as such, ocean circulation models are an essential tool for studying sea turtles during this vulnerable time. Here, we use the ocean circulation model HYCOM and the particle simulator Ichthyop to model the first month of hatchling transport across all sea turtle species from nesting sites across the world from 25 cohorts of hatchlings at 67 nesting sites. We evaluated transport as a function of spatiotemporal factors that could influence turtle movement, using generalized linear models and the information theoretic approach to model selection. We found that multiple physical factors influence transport across the first month of movement and that annual variability is an important factor in hatchling transport. Our findings suggest that the beaches turtles hatch from and the year in which they hatch may shape their early life and the speed of transport into the relative safety of the open ocean. An increased understanding of the likely survival of a cohort may aid in designating funds and planning conservation strategies for individual beaches to either compensate for or take advantage of the local currents. Full article
(This article belongs to the Special Issue Marine Species on the Move)
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20 pages, 5982 KiB  
Article
An Application of Fish Detection Based on Eye Search with Artificial Vision and Artificial Neural Networks
by Ángel J. Rico-Díaz, Juan R. Rabuñal, Marcos Gestal, Omar A. Mures and Jerónimo Puertas
Water 2020, 12(11), 3013; https://doi.org/10.3390/w12113013 - 27 Oct 2020
Cited by 6 | Viewed by 2933
Abstract
A fish can be detected by means of artificial vision techniques, without human intervention or handling the fish. This work presents an application for detecting moving fish in water by artificial vision based on the detection of a fish′s eye in the image, [...] Read more.
A fish can be detected by means of artificial vision techniques, without human intervention or handling the fish. This work presents an application for detecting moving fish in water by artificial vision based on the detection of a fish′s eye in the image, using the Hough algorithm and a Feed-Forward network. In addition, this method of detection is combined with stereo image recording, creating a disparity map to estimate the size of the detected fish. The accuracy and precision of this approach has been tested in several assays with living fish. This technique is a non-invasive method working in real-time and it can be carried out with low cost. Furthermore, it could find application in aquariums, fish farm management and to count the number of fish which swim through a fishway. In a fish farm it is important to know how the size of the fish evolves in order to plan the feeding and when to be able to catch fish. Our methodology allows fish to be detected and their size and weight estimated as they move underwater, engaging in natural behavior. Full article
(This article belongs to the Special Issue Marine Species on the Move)
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