Geographic variation in Loligo forbesi in the Northeast Atlantic Ocean: analysis of morphometric data and tests of causal hypotheses

Graham John Pierce, R S Thorpe, Lee Clark Hastie, A S Brierley, A Guerra, Peter Robin Boyle, R Jamieson, P Avila

Research output: Contribution to journalArticle

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Abstract

Geographic variation in the squid Loligo forbesi was investigated using multivariate analysis of morphometric and meristic characters in samples of squid taken from 13 localities in the Northeast Atlantic Ocean. Two character sets, body morphometrics and beak morphometrics, indicated similar patterns of variation, with squid from the Azores differing markedly from those on the continental shelf. No consistent pattern was apparent in meristic data. Partial Mantel tests indicated that similarity matrices for morphological data were significantly correlated with distance matrices for (a) geographic proximity, (b) whether the capture site was on the continental shelf or the Azorean bank, and (c) (beak data only) average sea-surface temperature at site of capture. Partial Mantel tests on allozyme data for the same individuals support hypothesis (b). The results suggest that L. forbesi in the Azores may reasonably be regarded as a distinct stock, differing significantly from L. forbesi on the continental shelf.

Original languageEnglish
Pages (from-to)541-547
Number of pages7
JournalMarine Biology
Volume119
Issue number4
DOIs
Publication statusPublished - Jul 1994

Keywords

  • LIZARD GALLOTIA-GALLOTI
  • MULTIVARIATE-ANALYSIS
  • MITOCHONDRIAL-DNA
  • SIMPLE PATTERNS
  • ISLAND
  • CONGRUENCE
  • SCALATION

Cite this

Pierce, G. J., Thorpe, R. S., Hastie, L. C., Brierley, A. S., Guerra, A., Boyle, P. R., ... Avila, P. (1994). Geographic variation in Loligo forbesi in the Northeast Atlantic Ocean: analysis of morphometric data and tests of causal hypotheses . Marine Biology, 119(4), 541-547. https://doi.org/10.1007/BF00354316

Geographic variation in Loligo forbesi in the Northeast Atlantic Ocean : analysis of morphometric data and tests of causal hypotheses . / Pierce, Graham John; Thorpe, R S ; Hastie, Lee Clark; Brierley, A S ; Guerra, A ; Boyle, Peter Robin; Jamieson, R ; Avila, P .

In: Marine Biology, Vol. 119, No. 4, 07.1994, p. 541-547.

Research output: Contribution to journalArticle

Pierce, GJ, Thorpe, RS, Hastie, LC, Brierley, AS, Guerra, A, Boyle, PR, Jamieson, R & Avila, P 1994, 'Geographic variation in Loligo forbesi in the Northeast Atlantic Ocean: analysis of morphometric data and tests of causal hypotheses ' Marine Biology, vol. 119, no. 4, pp. 541-547. https://doi.org/10.1007/BF00354316
Pierce, Graham John ; Thorpe, R S ; Hastie, Lee Clark ; Brierley, A S ; Guerra, A ; Boyle, Peter Robin ; Jamieson, R ; Avila, P . / Geographic variation in Loligo forbesi in the Northeast Atlantic Ocean : analysis of morphometric data and tests of causal hypotheses . In: Marine Biology. 1994 ; Vol. 119, No. 4. pp. 541-547.
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abstract = "Geographic variation in the squid Loligo forbesi was investigated using multivariate analysis of morphometric and meristic characters in samples of squid taken from 13 localities in the Northeast Atlantic Ocean. Two character sets, body morphometrics and beak morphometrics, indicated similar patterns of variation, with squid from the Azores differing markedly from those on the continental shelf. No consistent pattern was apparent in meristic data. Partial Mantel tests indicated that similarity matrices for morphological data were significantly correlated with distance matrices for (a) geographic proximity, (b) whether the capture site was on the continental shelf or the Azorean bank, and (c) (beak data only) average sea-surface temperature at site of capture. Partial Mantel tests on allozyme data for the same individuals support hypothesis (b). The results suggest that L. forbesi in the Azores may reasonably be regarded as a distinct stock, differing significantly from L. forbesi on the continental shelf.",
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AB - Geographic variation in the squid Loligo forbesi was investigated using multivariate analysis of morphometric and meristic characters in samples of squid taken from 13 localities in the Northeast Atlantic Ocean. Two character sets, body morphometrics and beak morphometrics, indicated similar patterns of variation, with squid from the Azores differing markedly from those on the continental shelf. No consistent pattern was apparent in meristic data. Partial Mantel tests indicated that similarity matrices for morphological data were significantly correlated with distance matrices for (a) geographic proximity, (b) whether the capture site was on the continental shelf or the Azorean bank, and (c) (beak data only) average sea-surface temperature at site of capture. Partial Mantel tests on allozyme data for the same individuals support hypothesis (b). The results suggest that L. forbesi in the Azores may reasonably be regarded as a distinct stock, differing significantly from L. forbesi on the continental shelf.

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