Nocturnal substrate association of four coral reef fish groups (parrotfishes, surgeonfishes, groupers and butterflyfishes) in relation to substrate architectural characteristics

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Aquatic Biology

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Introduction

Materials and Methods

Fish survey and study species

Data collection of substrate availability

Substrate categorization and definition of substrate architectural characteristics

Data analysis for substrate association

Variations in substrate associations among different fish size classes

Data preparation prior to analysis

Overall trend in substrate association

Results

Parrotfishes

Surgeonfishes

Groupers

Butterflyfishes

Family-level substrate associations

Overall trend of substrate association including the seventeen fish species

Discussion

Parrotfishes

Surgeonfishes

Groupers

Butterflyfishes

Variations in substrate association among different fish size classes

Implication about coral community degradation induced by climate change

Conclusions

Supplemental Information

Relative frequency (%) of fish individuals associated with substrates and substrate availability for three size classes of Chlorurus microrhino s

Numbers above bars represent the number of individuals on the focal substrate. Black arrows represent significant positive association for the substrates that were examined by resource selection ratio (Manly et al., 2002: see Materials and Methods). Fish photograph was taken by the author (A. Nanami).

DOI: 10.7717/peerj.17772/supp-1

Relative frequency (%) of fish individuals associated with substrates and substrate availability for two size classes of Chlorurus spilurus

Numbers above bars represent the number of individuals on the focal substrate. Black and white arrows represent significant positive and negative associations for the substrates that were examined by resource selection ratio (Manly et al., 2002: see Materials and Methods). Fish photograph was taken by the author (A. Nanami).

DOI: 10.7717/peerj.17772/supp-2

Relative frequency (%) of fish individuals associated with substrates and substrate availability for three size classes of Hiposcarus longiceps

Numbers above bars represent the number of individuals on the focal substrate. Black arrows represent significant positive association for the substrates that were examined by resource selection ratio (Manly et al., 2002: see Materials and Methods). Fish photograph was taken by the author (A. Nanami).

DOI: 10.7717/peerj.17772/supp-3

Relative frequency (%) of fish individuals associated with substrates and substrate availability for three size classes of Scarus ghobban

Numbers above bars represent the number of individuals on the focal substrate. Fish photograph was taken by the author (A. Nanami).

DOI: 10.7717/peerj.17772/supp-4

Relative frequency (%) of fish individuals associated with substrates and substrate availability for three size classes of Scarus forsteni

Numbers above bars represent the number of individuals on the focal substrate. Black arrows represent significant positive association for the substrates that were examined by resource selection ratio (Manly et al., 2002: see Materials and Methods). Fish photograph was taken by the author (A. Nanami).

DOI: 10.7717/peerj.17772/supp-5

Relative frequency (%) of fish individuals associated with substrates and substrate availability for two size classes of Scarus niger

Numbers above bars represent the number of individuals on the focal substrate. Black arrows represent significant positive association for the substrates that were examined by resource selection ratio (Manly et al., 2002: see Materials and Methods). Fish photograph was taken by the author (A. Nanami).

DOI: 10.7717/peerj.17772/supp-6

Relative frequency (%) of fish individuals associated with substrates and substrate availability for two size classes of Scarus oviceps

Numbers above bars represent the number of individuals on the focal substrate. Black arrows represent significant positive association for the substrates that were examined by resource selection ratio (Manly et al., 2002: see Materials and Methods). Fish photograph was taken by the author (A. Nanami).

DOI: 10.7717/peerj.17772/supp-7

Relative frequency (%) of fish individuals associated with substrates and substrate availability for two size classes of Scarus rivulatus

Numbers above bars represent the number of individuals on the focal substrate. Black arrows represent significant positive association for the substrates that were examined by resource selection ratio (Manly et al., 2002: see Materials and Methods). Fish photograph was taken by the author (A. Nanami).

DOI: 10.7717/peerj.17772/supp-8

Relative frequency (%) of fish individuals associated with substrates and substrate availability for three size classes of Naso unicornis

Numbers above bars represent the number of individuals on the focal substrate. Black and white arrows represent significant positive and negative association for the substrates that were examined by resource selection ratio (Manly et al., 2002: see Materials and Methods). Fish photograph was taken by the author (A. Nanami).

DOI: 10.7717/peerj.17772/supp-9

Relative frequency (%) of fish individuals associated with substrates and substrate availability for two size classes of Naso lituratus

Numbers above bars represent the number of individuals on the focal substrate. Black arrows represent significant positive association for the substrates that were examined by resource selection ratio (Manly et al., 2002: see Materials and Methods). Fish photograph was taken by the author (A. Nanami).

DOI: 10.7717/peerj.17772/supp-10

Relative frequency (%) of fish individuals associated with substrates and substrate availability for three size classes of Plectropomus leoparudus

Numbers above bars represent the number of individuals on the focal substrate. Black arrow represents significant positive association for the substrates that were examined by resource selection ratio (Manly et al., 2002: see Materials and Methods). Fish photograph was taken by the author (A. Nanami).

DOI: 10.7717/peerj.17772/supp-11

Relative frequency (%) of fish individuals associated with substrates and substrate availability for two size classes of Epinephelus ongus

Numbers above bars represent the number of individuals on the focal substrate. Black arrow represents significant positive association for the substrates that were examined by resource selection ratio (Manly et al., 2002: see Materials and Methods). Fish photograph was taken by the author (A. Nanami).

DOI: 10.7717/peerj.17772/supp-12

Relative frequency (%) of fish individuals associated with substrates and substrate availability for the four families (parrotfishes, surgeonfishes, groupers and butterflyfishes)

Left figures represent results using the seven types of substrate architectural characteristics. Right figures represent results using 19 substrate types for parrotfishes, surgeonfishes and butterflyfishes, and 24 substrate types for groupers, respectively. Numbers adjacent to bars represent the number of individuals that were associated with the focal substrate. All fish illustrations were drawn by the author (A. Nanami).

DOI: 10.7717/peerj.17772/supp-13

Dendrogram of hierarchical clusters representing the nocturnal substrate associations of the 17 fish species via the group-average-linkage method using the Bray-Curtis similarity index in terms of five types of substrate architectural characteristics (A)

In (B), “Other substrates” includes 11 substrate types (bottlebrush Acropora, non-acroporid branching coral, foliose coral, Pocillopora, dead corymbose Acropora, dead tabular Acropora, dead staghorn Acropora, dead branching Acropora, dead non-acroporid branching coral, dead Pocillopora and coral rubble). Two types of substrate architectural characteristics (uneven structure and macroalgae) and seven substrate types (other coral, dead bottlebrush Acropora, dead foliose coral, dead other coral, soft coral, sand and macroalgae) are not included in analyses, since no fish individuals were associated with the substrates. For details about data, see ” Fig. S14 raw data.xls.”

DOI: 10.7717/peerj.17772/supp-14

Results of principal component analysis (PCA) for substrate association of three size classes of fishes based on five types of substrate architectural characteristics (Small: fish total length ≤ 29 cm; Medium: fish total length = 30 cm –39 cm; Larg

Since total length of five species (Scarus schlegeli, Chaetodon trifascialis, C. lunulatus, C. ephippium and C. auriga) were 29 cm or less for all individuals, only results for the smaller-sized individuals are shown for the species. Pie charts in (B-R) represent proportion of nocturnal substrate association for each size class for each species.

DOI: 10.7717/peerj.17772/supp-15

Results of principal component analysis (PCA) for substrate association of three size classes of fishes based on 18 substrate types (Small: fish total length ≤ 29 cm; Medium: fish total length = 30 cm –39 cm; Large: fish total length ≥ 40 cm)

Since total length of five species (Scarus schlegeli, Chaetodon trifascialis, C. lunulatus, C. ephippium and C. auriga) were 29 cm or less for all individuals, only results for the smaller-sized individuals are shown for the species. Pie charts in (B-R) represent proportion of nocturnal substrate association for each size class for each species.

DOI: 10.7717/peerj.17772/supp-16

Results of standardized selection ratio of the nine parrotfish species calculated by resource selection ratio (Table 3) for seven types of substrate architectural characteristics

Significant positive associations are shown as bold characters. N.S.: non significant associations. -: no fishes were found on the substrates.

DOI: 10.7717/peerj.17772/supp-17

Results of standardized selection ratio of the nine parrotfish species calculated by resource selection ratio (Table 4) for 25 substrate types

Significant positive associations are shown as bold characters. N.S.: non significant associations. -: no fishes were found on the substrates.

DOI: 10.7717/peerj.17772/supp-18

Results of standardized selection ratio of the two surgeonfish, two grouper and four butterflyfish species calculated by resource selection ratio (Table 5) for seven types of substrate architectural characteristics

Significant positive associations are shown as bold characters. N.S.: non significant associations. -: no fishes were found on the substrates.

DOI: 10.7717/peerj.17772/supp-19

Results of standardized selection ratio of the two surgeonfish, two grouper and four butterflyfish species calculated by resource selection ratio (Table 5) for 25 substrate types

Significant positive associations are shown as bold characters. N.S.: non significant associations. -: no fishes were found on the substrates.

DOI: 10.7717/peerj.17772/supp-20

Results of statistical significance of substrate association of the four families (parrotfishes, surgeonfishes, groupers and butterflyfishes) calculated by resource selection ratio for seven types of substrate architectural characteristics

Significant positive associations are shown as bold characters. N.S.: non significant associations. -: no fishes were found on the substrates.

DOI: 10.7717/peerj.17772/supp-21

Results of statistical significance of substrate association of the four families (parrotfishes, surgeonfishes, groupers and butterflyfishes) calculated by resource selection ratio for 25 substrate types

Significant positive associations are shown as bold characters. N.S.: non significant associations. -: no fishes were found on the substrates.

DOI: 10.7717/peerj.17772/supp-22

Results of standardized selection ratio of the four families (parrotfishes, surgeonfishes, groupers and butterflyfishes) calculated by resource selection ratio for seven types of substrate architectural characteristics (Table S5)

Significant positive associations are shown as bold characters. N.S.: non significant associations. -: no fishes were found on the substrates.

DOI: 10.7717/peerj.17772/supp-23

Results of standardized selection ratio of the four families (parrotfishes, surgeonfishes, groupers and butterflyfishes) calculated by resource selection ratio for 25 substrate types (Table S6)

Significant positive associations are shown as bold characters. N.S.: non significant associations. -: no fishes were found on the substrates.

DOI: 10.7717/peerj.17772/supp-24

Substrate avaiability raw data

DOI: 10.7717/peerj.17772/supp-36

Additional Information and Declarations

Competing Interests

The author declares that they have no competing interests.

Author Contributions

Atsushi Nanami conceived and designed the experiments, performed the experiments, analyzed the data, prepared figures and/or tables, authored or reviewed drafts of the article, and approved the final draft.

Animal Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

The present study conducted fish sampling by spear gun, which is officially permitted by Okinawa Prefectural Government (fisheries coordinate regulation No. 37). This regulation shows that scientists can capture marine organisms with no restrictions about fishing gear for scientific purpose.

In Okinawan region, permissions about field observations are not required. This is because above-mentioned fisheries coordinate regulation does not require permission about field observations from Okinawa Prefectural Government.

Data Availability

The following information was supplied regarding data availability:

The raw measurements and data are available in the Supplementary Files.

Funding

The authors received no funding for this work.

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