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Branam EN, Wong JY, Chan BKK, Chan KYK. A tail's tale: Biomechanical roles of dorsal thoracic spine of barnacle nauplii. Integr Comp Biol 2021; 61:1905-1916. [PMID: 33905496 DOI: 10.1093/icb/icab036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Many marine invertebrates have complex life histories that begin with a planktonic larval stage. Similar to other plankton, these larval invertebrates often possess protruding body extensions, but their function beyond predator deterrence is not well-documented. For example, the planktonic nauplii of crustaceans have spines. Using the epibiotic pedunculate barnacle Octolasmis spp., we investigated how the dorsal thoracic spine affects swimming and fluid disturbance by comparing nauplii with their spines partially removed against those with intact spines. Our motion analysis showed that amputated Octolasmis spp. swam slower, in jerkier trajectories, and were less efficient per stroke cycle than those with intact spines. Amputees showed alterations in limb beat pattern: larger beat amplitude, increased phase lag, and reduced contralateral symmetry. These changes might partially help increase propulsive force generation and streamline the flow, but were insufficient to restore full function. Particle image velocimetry further showed that amputees had a larger relative area of influence, implying elevated risk by rheotactic predator. Body extensions and their interactions with limb motion play important biomechanical roles in shaping larval performance, which likely influences the evolution of form.
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Affiliation(s)
- E N Branam
- Department of Biology, Swarthmore College, Swarthmore, PA 19081, USA
| | - J Y Wong
- Biodiversity Research Center, Academia Sinica, Taipei, 11529, Taiwan.,Department of Life Science, National Taiwan Normal University, Taipei, 11677, Taiwan
| | - B K K Chan
- Biodiversity Research Center, Academia Sinica, Taipei, 11529, Taiwan
| | - K Y K Chan
- Department of Biology, Swarthmore College, Swarthmore, PA 19081, USA
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Abstract
A central goal in evolutionary biology is connecting morphological features with ecological functions. For marine invertebrate larvae, appendage movement determines locomotion, feeding, and predator avoidance ability. Barnacle larvae are morphologically diverse, and the morphology of non-feeding lecithotrophic nauplii are distinct from those that are planktotrophic. Lecithotrophic larvae have a more globular body shape and simplified appendages when compared with planktotrophs. However, little is known about whether and how such morphological changes affect kinematics, hydrodynamics, and ecological functions. Here, we compared the nauplii kinematics and hydrodynamics of a lecithotrophic Rhizocephalan species, Polyascus planus, against that of the planktotrophic nauplii of an intertidal barnacle, Tetraclita japonica. High-speed, micro-particle image velocimetry analysis showed that the Polyascus nauplii swam faster and had higher amplitude and more synchronous appendage beating than the Tetraclita nauplii. This fast swimming was accompanied by a faster attenuation of induced flow with distance, suggesting reduced predation risk. Tetraclita nauplii had more efficient per beat cycles with less backward displacement during the recovery stroke. This "anchoring effect" resulted from the anti-phase beating of appendages. This movement, together with a high-drag body form, likely helps direct the suction flow toward the ventral food capturing area. In sum, the tradeoff between swimming speed and predation risks may have been an important factor in the evolution of the observed larval forms.
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Affiliation(s)
- J Y Wong
- Department of Life Science, National Taiwan Normal University, Taipei 11677, Taiwan
- Biodiversity Program, Taiwan International Graduate Program, Academia Sinica, Taipei 11529, Taiwan
- Biodiversity Research Center, Academia Sinica, Taipei 11529, Taiwan
| | - B K K Chan
- Biodiversity Research Center, Academia Sinica, Taipei 11529, Taiwan
| | - K Y K Chan
- Biology Department, Swarthmore College, Swarthmore, PA 19081, USA
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Strain EMA, Alexander KA, Kienker S, Morris R, Jarvis R, Coleman R, Bollard B, Firth LB, Knights AM, Grabowski JH, Airoldi L, Chan BKK, Chee SY, Cheng Z, Coutinho R, de Menezes RG, Ding M, Dong Y, Fraser CML, Gómez AG, Juanes JA, Mancuso P, Messano LVR, Naval-Xavier LPD, Scyphers S, Steinberg P, Swearer S, Valdor PF, Wong JXY, Yee J, Bishop MJ. Urban blue: A global analysis of the factors shaping people's perceptions of the marine environment and ecological engineering in harbours. Sci Total Environ 2019; 658:1293-1305. [PMID: 30677991 DOI: 10.1016/j.scitotenv.2018.12.285] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Revised: 12/17/2018] [Accepted: 12/18/2018] [Indexed: 06/09/2023]
Abstract
Marine harbours are the focus of a diverse range of activities and subject to multiple anthropogenically induced pressures. Support for environmental management options aimed at improving degraded harbours depends on understanding the factors which influence people's perceptions of harbour environments. We used an online survey, across 12 harbours, to assess sources of variation people's perceptions of harbour health and ecological engineering. We tested the hypotheses: 1) people living near impacted harbours would consider their environment to be more unhealthy and degraded, be more concerned about the environment and supportive of and willing to pay for ecological engineering relative to those living by less impacted harbours, and 2) people with greater connectedness to the harbour would be more concerned about and have greater perceived knowledge of the environment, and be more supportive of, knowledgeable about and willing to pay for ecological engineering, than those with less connectedness. Across twelve locations, the levels of degradation and modification by artificial structures were lower and the concern and knowledge about the environment and ecological engineering were greater in the six Australasian and American than the six European and Asian harbours surveyed. We found that people's perception of harbours as healthy or degraded, but not their concern for the environment, reflected the degree to which harbours were impacted. There was a positive relationship between the percentage of shoreline modified and the extent of support for and people's willingness to pay indirect costs for ecological engineering. At the individual level, measures of connectedness to the harbour environment were good predictors of concern for and perceived knowledge about the environment but not support for and perceived knowledge about ecological engineering. To make informed decisions, it is important that people are empowered with sufficient knowledge of the environmental issues facing their harbour and ecological engineering options.
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Affiliation(s)
- E M A Strain
- Sydney Institute of Marine Science, 19 Chowder Bay Rd, Mosman, New South Wales 2088, Australia; Centre for Marine Bio-Innovation, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, New South Wales 2052, Australia,; National Centre for Coasts and Climate, School of Biosciences, The University of Melbourne, Parkville, Victoria 3010, Australia.
| | - K A Alexander
- Institute for Marine and Antarctic Studies, University of Tasmania, PO Box 49, Hobart, Tasmania 7001, Australia; Centre for Marine Socioecology, University of Tasmania, Hobart, Tasmania 7001, Australia
| | - S Kienker
- Sydney Institute of Marine Science, 19 Chowder Bay Rd, Mosman, New South Wales 2088, Australia; University of Sydney, Centre for Research on Ecological Impacts of Coastal Cities, School of Life and Environmental Sciences, NSW 2006, Australia
| | - R Morris
- National Centre for Coasts and Climate, School of Biosciences, The University of Melbourne, Parkville, Victoria 3010, Australia; University of Sydney, Centre for Research on Ecological Impacts of Coastal Cities, School of Life and Environmental Sciences, NSW 2006, Australia
| | - R Jarvis
- Sydney Institute of Marine Science, 19 Chowder Bay Rd, Mosman, New South Wales 2088, Australia; Institute for Applied Ecology New Zealand, School of Science, Auckland University of Technology, Auckland 1142, New Zealand
| | - R Coleman
- Sydney Institute of Marine Science, 19 Chowder Bay Rd, Mosman, New South Wales 2088, Australia; University of Sydney, Centre for Research on Ecological Impacts of Coastal Cities, School of Life and Environmental Sciences, NSW 2006, Australia
| | - B Bollard
- Institute for Applied Ecology New Zealand, School of Science, Auckland University of Technology, Auckland 1142, New Zealand
| | - L B Firth
- School of Biological and Marine Sciences, University of Plymouth, Plymouth PL4 8AA, Drake Circus, UK
| | - A M Knights
- School of Biological and Marine Sciences, University of Plymouth, Plymouth PL4 8AA, Drake Circus, UK
| | - J H Grabowski
- Marine Science Center, Northeastern University, 430 Nahant Road, Nahant, MA 01907, USA
| | - L Airoldi
- University of Bologna, Dipartimento di Scienze Biologiche, Geologiche ed Ambientali (BIGEA) & Centro Interdipartimentale di Ricerca per le Scienze Ambientali (CIRSA), UO CoNISMa, Via S. Alberto, 163, Ravenna I-48123, Italy
| | - B K K Chan
- Biodiversity Research Centre, Academia Sinica, Taipei 115, Taiwan
| | - S Y Chee
- Centre for Marine and Coastal Studies, Universiti Sains Malaysia, Penang 11800, Malaysia
| | - Z Cheng
- State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
| | - R Coutinho
- Department of Marine Biotecnology, Instituto de Estudos do Mar Almirante Paulo Moreira, Brazilian Navy & Post-Graduation Program in Marine Biotechnology, IEAPM/UFF, Arraial do Cabo, Rio de Janeiro 28930-000, Brazil
| | - R G de Menezes
- Department of Marine Biotecnology, Instituto de Estudos do Mar Almirante Paulo Moreira, Brazilian Navy & Post-Graduation Program in Marine Biotechnology, IEAPM/UFF, Arraial do Cabo, Rio de Janeiro 28930-000, Brazil
| | - M Ding
- State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
| | - Y Dong
- State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
| | - C M L Fraser
- Biodiversity Research Centre, Academia Sinica, Taipei 115, Taiwan
| | - A G Gómez
- Environmental Hydraulics Institute, Universidad de Cantabria, Avda. Isabel Torres, 15, Parque Científico y Tecnológico de Cantabria, 39011 Santander, Spain
| | - J A Juanes
- Environmental Hydraulics Institute, Universidad de Cantabria, Avda. Isabel Torres, 15, Parque Científico y Tecnológico de Cantabria, 39011 Santander, Spain
| | - P Mancuso
- University of Bologna, Dipartimento di Scienze Biologiche, Geologiche ed Ambientali (BIGEA) & Centro Interdipartimentale di Ricerca per le Scienze Ambientali (CIRSA), UO CoNISMa, Via S. Alberto, 163, Ravenna I-48123, Italy
| | - L V R Messano
- Department of Marine Biotecnology, Instituto de Estudos do Mar Almirante Paulo Moreira, Brazilian Navy & Post-Graduation Program in Marine Biotechnology, IEAPM/UFF, Arraial do Cabo, Rio de Janeiro 28930-000, Brazil
| | - L P D Naval-Xavier
- Department of Marine Biotecnology, Instituto de Estudos do Mar Almirante Paulo Moreira, Brazilian Navy & Post-Graduation Program in Marine Biotechnology, IEAPM/UFF, Arraial do Cabo, Rio de Janeiro 28930-000, Brazil
| | - S Scyphers
- Marine Science Center, Northeastern University, 430 Nahant Road, Nahant, MA 01907, USA
| | - P Steinberg
- Sydney Institute of Marine Science, 19 Chowder Bay Rd, Mosman, New South Wales 2088, Australia; Centre for Marine Bio-Innovation, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - S Swearer
- National Centre for Coasts and Climate, School of Biosciences, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - P F Valdor
- Environmental Hydraulics Institute, Universidad de Cantabria, Avda. Isabel Torres, 15, Parque Científico y Tecnológico de Cantabria, 39011 Santander, Spain
| | - J X Y Wong
- University of Bologna, Dipartimento di Scienze Biologiche, Geologiche ed Ambientali (BIGEA) & Centro Interdipartimentale di Ricerca per le Scienze Ambientali (CIRSA), UO CoNISMa, Via S. Alberto, 163, Ravenna I-48123, Italy
| | - J Yee
- Centre for Marine and Coastal Studies, Universiti Sains Malaysia, Penang 11800, Malaysia
| | - M J Bishop
- Sydney Institute of Marine Science, 19 Chowder Bay Rd, Mosman, New South Wales 2088, Australia; Department of Biological Sciences, Macquarie University, NSW 2109, Australia
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