Peer Review History
| Original SubmissionFebruary 22, 2025 |
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PONE-D-25-08646Exploring habitat characteristics, distribution, and niche relationships of Asian horseshoe crabs: preserving living fossils and biodiversityPLOS ONE Dear Dr. Wang, Thank you for submitting your manuscript to PLOS ONE. After careful consideration, we feel that it has merit but does not fully meet PLOS ONE’s publication criteria as it currently stands. Therefore, we invite you to submit a revised version of the manuscript that addresses the points raised during the review process. Please submit your revised manuscript by May 09 2025 11:59PM. If you will need more time than this to complete your revisions, please reply to this message or contact the journal office at plosone@plos.org . When you're ready to submit your revision, log on to https://www.editorialmanager.com/pone/ and select the 'Submissions Needing Revision' folder to locate your manuscript file. Please include the following items when submitting your revised manuscript:
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Thank you for stating the following financial disclosure: “This study was funded by the Guangdong Provincial Field Observation and Research Station for Marine Ecosystem in Hanjiang River Estuary - Nanao Island Area Open Fund (Grant No. HNS202407), the National Key Research and Development Program of China (Grant No. 2024YFD2401803 & 2024YFD2401802), the Guangdong Provincial Ordinary University Youth Innovative Talent Project in 2024 (Grant No. 2024KQNCX134), the Guangdong Provincial Special Fund Project for Talent Development Strategy in 2024 (Grant No. 2024R3005), and the Guangdong Ocean University Scientific Research Startup Funding Project (Grant No. 060302022312).” Please state what role the funders took in the study. If the funders had no role, please state: "The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript." If this statement is not correct you must amend it as needed. Please include this amended Role of Funder statement in your cover letter; we will change the online submission form on your behalf. 3. Please include captions for your Supporting Information files at the end of your manuscript, and update any in-text citations to match accordingly. Please see our Supporting Information guidelines for more information: http://journals.plos.org/plosone/s/supporting-information. [Note: HTML markup is below. Please do not edit.] Reviewers' comments: Reviewer's Responses to Questions Comments to the Author 1. Is the manuscript technically sound, and do the data support the conclusions? The manuscript must describe a technically sound piece of scientific research with data that supports the conclusions. Experiments must have been conducted rigorously, with appropriate controls, replication, and sample sizes. The conclusions must be drawn appropriately based on the data presented. Reviewer #1: Partly Reviewer #2: Yes Reviewer #3: Yes ********** 2. Has the statistical analysis been performed appropriately and rigorously? Reviewer #1: Yes Reviewer #2: Yes Reviewer #3: Yes ********** 3. Have the authors made all data underlying the findings in their manuscript fully available? The PLOS Data policy requires authors to make all data underlying the findings described in their manuscript fully available without restriction, with rare exception (please refer to the Data Availability Statement in the manuscript PDF file). The data should be provided as part of the manuscript or its supporting information, or deposited to a public repository. For example, in addition to summary statistics, the data points behind means, medians and variance measures should be available. If there are restrictions on publicly sharing data—e.g. participant privacy or use of data from a third party—those must be specified. Reviewer #1: Yes Reviewer #2: Yes Reviewer #3: Yes ********** 4. Is the manuscript presented in an intelligible fashion and written in standard English? PLOS ONE does not copyedit accepted manuscripts, so the language in submitted articles must be clear, correct, and unambiguous. Any typographical or grammatical errors should be corrected at revision, so please note any specific errors here. Reviewer #1: Yes Reviewer #2: No Reviewer #3: Yes ********** 5. Review Comments to the Author Please use the space provided to explain your answers to the questions above. You may also include additional comments for the author, including concerns about dual publication, research ethics, or publication ethics. (Please upload your review as an attachment if it exceeds 20,000 characters) Reviewer #1: The manuscript presents a valuable analysis of the distribution and habitat characteristics of three Asian horseshoe crab species using MaxEnt modeling and niche analysis. The use of MaxEnt modeling is appropriate for species distribution predictions, and the study follows standard procedures for model validation (e.g., AUC assessment, VIF analysis to remove collinearity). The incorporation of paleo-environmental modeling to assess Last Glacial Maximum (LGM) refugia is a valuable approach for understanding historical species distributions. The study has strong potential for contributing to conservation efforts by identifying key environmental factors affecting species distribution. However, there are major issues with how the findings are framed, interpreted, and connected to the broader context of conservation and biodiversity management. The manuscript would benefit from a stronger positioning within the state of the art, improved discussion of methodological assumptions, and clearer conservation implications. The Introduction does not sufficiently compare the study’s approach and findings with prior research on horseshoe crab distribution. The manuscript should clearly specify: --What aspects of habitat suitability and niche relationships have already been studied for these species. What specific gaps this study addresses (e.g., finer-scale niche overlap analysis, previously overlooked environmental factors). -How the findings advance current understanding. The Discussion and Conclusion sections claim that the study supports conservation strategies but fail to articulate: How the identified key environmental factors should inform conservation efforts. Specific recommendations for habitat protection or management actions. Potential policy implications (e.g., marine protected areas, restoration initiatives). The manuscript does not clarify whether occurrence data correspond to adults, juveniles, or larvae, which is critical for interpreting distribution patterns. Horseshoe crabs exhibit ontogenetic habitat shifts, with larvae often requiring different environmental conditions than adults. Specific comments are found in the attached pdf and must be addressed individually. Reviewer #2: The study presents a robust analysis of the distribution and habitat characteristics of Asian horseshoe crabs (Tachypleus tridentatus, Tachypleus gigas, and Carcinoscorpius rotundicauda), employing predictive modeling to infer both historical and contemporary patterns. The use of the MaxEnt model and niche overlap metrics are well-established and appropriate methodological approaches for the study's objectives. Despite its scientific relevance and potential impact on species conservation, the manuscript has some weaknesses, including: 1) a lack of deeper justifications for certain methodological choices; 2) some model-based inferences that require stronger support from the literature; and 3) minor textual adjustments to improve clarity and argumentation. More information about suggestions the authors can to access in the PDF archive annex to this review. Thus, I recommend that the manuscript undergo revision before acceptance for publication, incorporating the suggested adjustments outlined below. Reviewer #3: Overall: This is overall a very good and interesting paper. The authors used publicly available datasets to model the spatial distribution, habitat suitability, and niche overlap among the three Asian species of horseshoe crabs, with the aim of identifying important habitats for conservation planning for these threatened or potentially threatened (data-deficient, understudied) species. Exercises were also done to identify the key environmental variables determining each species’ habitat distribution and their potential habitat and refugia during the Last Glacial Maximum (LGM). For the most part, the paper is well written, the figures are good, and the analyses are done and interpreted logically. I particularly liked how the authors went through the key variables determining habitat that they identified in the Discussion to assess why these should be important for the studied species. The study is significant, novel, and should be published after some revisions. I make some comments below about places where the paper might benefit from clarifications or additional Discussion points, but with one exception these are mostly minor concerns. My one larger concern relates to the LGM analysis, which (maybe more by brevity/omission of details than intended misdirection) may appear to the reader as an equivalent analysis to the main modelling efforts, when in reality it was a much more limited exercise with less certain results. As I elaborate below, there needs to be much more clarity on exactly how this was done, and probably also more caution in interpreting its results. Please note: I consider that Minor Revisions are needed for the majority of the paper, although suggested changes to the details presented for the LGM analysis (or even its removal) as detailed below may be considered more extensive (Major). Specific comments, roughly in order of their occurrence in the text: (1) This is a very minor gripe, but it confused that the three horseshoe crab species’ names are listed in no apparent order for no clear reason in some parts of the paper (e.g., lines 129-130, 133-134, 215-216, 24-246). In other parts Tachypleus species are listed before C. rotundicauda, which at least has some logic (e.g., lines 55-6, 61-68, 85-86), although it is still a little strange to list T. tridentatus before T. gigas; this latter order does at least match the alphabetical order of the common names given in lines 54-56. I think it would be preferable to list the species’ names in actual alphabetical order at most/all places in the text – so Carcinoscorpius rotundicauda, Tachypleus gigas, and T. tridentatus. This would also apply to how the results are presented. (2) Lines 90-104, 149-153: MaxENT was used for species distribution modelling in this study. Nothing wrong with this, it is a well-established and widely used method. The authors do note around line 90 that other techniques are available, however, and it may be worth noting alternative approaches in the Discussion somewhere. Could this analysis be repeated (maybe in future) with different approaches, such as what, with what added benefits/drawbacks, and would the outcomes be expected to be very different, etc.? (3) Line 137: Just for clarity, should specify that this is “a resolution of 2.5 minutes latitude/longitude” (to avoid confusion with time). (4) LGM Analysis: Lines 137-138: I think a lot of important detail is skipped over here. The GMED database does include data layers for the Last Glacial Maximum (LGM), but as far as I can tell from browsing the website only a handful (4) of environmental variables are available there from the LGM – specifically water depth, sea surface temperature, salinity, and ice thickness. My understanding based on the paper is that the authors applied their habitat suitability/species distribution models for each of the three species derived for the present/historical period to the LGM data to determine past habitats and refugia (lines 293-315 in the Results, Fig. 6). However, key variables identified in the present-day models, such as chlorophyll-a and winds (lines 247-265), are not apparently available in the LGM data layers from GMED (indeed, of all the variables listed in Table 1, hardly any seem available in the LGM layers), so it is not clear to me how the authors could identify past habitats in this setup. This needs to be explained. Maybe additional variables are available in GMED for the LGM that are not obvious on the public-facing webpage, but if so more information needs to be provided on where/how these were downloaded. A table like Table 1 showing which LGM data layers were considered would be useful regardless. However, I suspect that maybe the present-day potential distributions were just applied to water depths and shorelines available during the LGM to identify past refugia, without considering other variables’ past values’ impact in habitat suitability. If so, not stating this clearly in the paper potentially misleads the reader. Further, there are important limitations to this approach that need to be addressed in the Methods and Discussion. For example, if chlorophyll concentration strongly impacts a species’ distribution, then can we be sure that an area with suitable chlorophyll levels today would have had suitable levels in the LGM, even if it was available habitat based on depth and shoreline? I think not. Consider that today’s mid-deeper water shelf seas would have been shallow coastal areas during the LGM, with correspondingly different currents, light levels, etc. impacting plankton productivity. In the discussion using paleoenvironmental data (line 444) to better address this in the future is mentioned – is this because such data were not used in the present study? If so this is not obvious from the Methods and Results as written. It might even be worth considering removing the LGM analysis entirely, given the potential problems identified above. I see it as a minor side analysis to the main part of this study, and do not think a lot of important material is lost by not identifying LGM refugia – the study still produces habitat suitability and niche overlap maps for the species and identifies important variables, which is most useful for conservation planning. (5) Line 298: change “highly and moderately suitability” to “highly and moderately suitable” (6) Lines 245-265, 338, and elsewhere: The authors should consider not presenting depths as negative numbers in the paper. It is logical and probably necessary for depth have a negative value when running your models (particularly to make it apply to the LGM when depths might become positive die to lower sea levels), but it become confusing to read in the text – most of us are used to thinking of the sea at a given point being 40 m deep, not “-40 m deep”. Some readers may even misread the negative values to imply depths above the sea level, below the sea bed, at some point in between the surface and bottom (e.g., 40 m down), etc. (7) Temperature is included in the modeling exercise as an environmental variable, but is not one of the main ones found to impact the habitat distributions of the studied species. This is somewhat surprising, given the widespread impacts of temperature on biota, particularly aquatic arthropods, but may well be true – the studied species are all found in and around the tropics mainly, so temperature may have less impact on their biology overall within their ranges, other than perhaps at the extremes. This still may be a point to raise in the Discussion, though, and can be tied in with potential conservation concerns related to climate change. Also, during the LGM, one wonders if temperatures might have been different enough to affect habitat suitability for these species? Maybe another Discussion point to add. SST data are available for the LGM from GMED, so there is potential to address this question in a future exercise. ********** 6. PLOS authors have the option to publish the peer review history of their article (what does this mean? ). If published, this will include your full peer review and any attached files. If you choose “no”, your identity will remain anonymous but your review may still be made public. Do you want your identity to be public for this peer review? For information about this choice, including consent withdrawal, please see our Privacy Policy . Reviewer #1: No Reviewer #2: Yes: Marcelo Antonio Amaro Pinheiro Reviewer #3: Yes: Brady K. Quinn ********** [NOTE: If reviewer comments were submitted as an attachment file, they will be attached to this email and accessible via the submission site. Please log into your account, locate the manuscript record, and check for the action link "View Attachments". If this link does not appear, there are no attachment files.] While revising your submission, please upload your figure files to the Preflight Analysis and Conversion Engine (PACE) digital diagnostic tool, https://pacev2.apexcovantage.com/ . PACE helps ensure that figures meet PLOS requirements. To use PACE, you must first register as a user. Registration is free. 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| Revision 1 |
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Modeling habitat distribution and niche overlap of Asian horseshoe crabs: implications for conservation PONE-D-25-08646R1 Dear Dr. Wang, We’re pleased to inform you that your manuscript has been judged scientifically suitable for publication and will be formally accepted for publication once it meets all outstanding technical requirements. Within one week, you’ll receive an e-mail detailing the required amendments. When these have been addressed, you’ll receive a formal acceptance letter and your manuscript will be scheduled for publication. An invoice will be generated when your article is formally accepted. Please note, if your institution has a publishing partnership with PLOS and your article meets the relevant criteria, all or part of your publication costs will be covered. Please make sure your user information is up-to-date by logging into Editorial Manager at Editorial Manager® and clicking the ‘Update My Information' link at the top of the page. If you have any questions relating to publication charges, please contact our Author Billing department directly at authorbilling@plos.org. If your institution or institutions have a press office, please notify them about your upcoming paper to help maximize its impact. If they’ll be preparing press materials, please inform our press team as soon as possible -- no later than 48 hours after receiving the formal acceptance. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information, please contact onepress@plos.org. Kind regards, Phuping Sucharitakul Academic Editor PLOS ONE Additional Editor Comments (optional): Reviewers' comments: Reviewer's Responses to Questions Comments to the Author 1. If the authors have adequately addressed your comments raised in a previous round of review and you feel that this manuscript is now acceptable for publication, you may indicate that here to bypass the “Comments to the Author” section, enter your conflict of interest statement in the “Confidential to Editor” section, and submit your "Accept" recommendation. Reviewer #1: All comments have been addressed Reviewer #2: All comments have been addressed Reviewer #3: All comments have been addressed ********** 2. Is the manuscript technically sound, and do the data support the conclusions? The manuscript must describe a technically sound piece of scientific research with data that supports the conclusions. Experiments must have been conducted rigorously, with appropriate controls, replication, and sample sizes. The conclusions must be drawn appropriately based on the data presented. Reviewer #1: (No Response) Reviewer #2: Yes Reviewer #3: Yes ********** 3. Has the statistical analysis been performed appropriately and rigorously? Reviewer #1: (No Response) Reviewer #2: Yes Reviewer #3: Yes ********** 4. Have the authors made all data underlying the findings in their manuscript fully available? The PLOS Data policy requires authors to make all data underlying the findings described in their manuscript fully available without restriction, with rare exception (please refer to the Data Availability Statement in the manuscript PDF file). The data should be provided as part of the manuscript or its supporting information, or deposited to a public repository. For example, in addition to summary statistics, the data points behind means, medians and variance measures should be available. If there are restrictions on publicly sharing data—e.g. participant privacy or use of data from a third party—those must be specified. Reviewer #1: (No Response) Reviewer #2: Yes Reviewer #3: Yes ********** 5. Is the manuscript presented in an intelligible fashion and written in standard English? PLOS ONE does not copyedit accepted manuscripts, so the language in submitted articles must be clear, correct, and unambiguous. Any typographical or grammatical errors should be corrected at revision, so please note any specific errors here. Reviewer #1: (No Response) Reviewer #2: Yes Reviewer #3: Yes ********** 6. Review Comments to the Author Please use the space provided to explain your answers to the questions above. You may also include additional comments for the author, including concerns about dual publication, research ethics, or publication ethics. (Please upload your review as an attachment if it exceeds 20,000 characters) Reviewer #1: all comments addressed suitably Reviewer #2: There are a few grammatical problems in the text, but they are too minor to mention here. The authors did a good job, and this article will be very useful and appreciated by readers in many areas of knowledge. Reviewer #3: The authors have done a good job revising their paper to address my and other reviewers' comments. I believe it can now be accepted for publication as is, and may become an important and highly cited work. ********** 7. PLOS authors have the option to publish the peer review history of their article (what does this mean? ). If published, this will include your full peer review and any attached files. If you choose “no”, your identity will remain anonymous but your review may still be made public. Do you want your identity to be public for this peer review? For information about this choice, including consent withdrawal, please see our Privacy Policy . Reviewer #1: Yes: Ana Silva Reviewer #2: Yes: Marcelo Antonio Amaro Pinheiro Reviewer #3: Yes: Brady K. Quinn **********
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| Formally Accepted |
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PONE-D-25-08646R1 PLOS ONE Dear Dr. Wang, I'm pleased to inform you that your manuscript has been deemed suitable for publication in PLOS ONE. Congratulations! Your manuscript is now being handed over to our production team. At this stage, our production department will prepare your paper for publication. This includes ensuring the following: * All references, tables, and figures are properly cited * All relevant supporting information is included in the manuscript submission, * There are no issues that prevent the paper from being properly typeset You will receive further instructions from the production team, including instructions on how to review your proof when it is ready. Please keep in mind that we are working through a large volume of accepted articles, so please give us a few days to review your paper and let you know the next and final steps. Lastly, if your institution or institutions have a press office, please let them know about your upcoming paper now to help maximize its impact. If they'll be preparing press materials, please inform our press team within the next 48 hours. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information, please contact onepress@plos.org. If we can help with anything else, please email us at customercare@plos.org. Thank you for submitting your work to PLOS ONE and supporting open access. Kind regards, PLOS ONE Editorial Office Staff on behalf of Dr. Phuping Sucharitakul Academic Editor PLOS ONE |
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